3760DCP - Measurement Daytronic - Free user manual and instructions

USER MANUAL 3760DCP Daytronic

DC VOLTAGE CONDITIONER

INSTRUCTION MANUAL

DRYTRONIC 3760 DC +30.506 c f c f ZERO SPAN +CAL TAHE

3700

Instrument Series

WARNING

Death, serious injury, or fire hazard could result from improper connection of this instrument. Read and understand this manual before connecting this instrument. Follow all installation and operating instructions while using this instrument.

Connection of this instrument must be performed in compliance with the National Electrical Code (ANSI/NFPA 70-2014) of USA and any additional safety requirements applicable to your installation.

Installation, operation, and maintenance of this instrument must be performed by qualified personnel only. The National Electrical Code defines a qualified person as “one who has demonstrated the skills and knowledge related to the construction and operation of the electrical equipment and installations, and who has received safety training on the hazards involved.”

Qualified personnel who work on or near exposed energized electrical conductors must follow applicable safety related work practices and procedures including appropriate personal protective equipment in compliance with the Standard for Electrical Safety Requirements for Employee Workplaces (ANSI/NFPA 70E-2012) of USA and any additional workplace safety requirements applicable to your installation.

ADVERTENCIA

The following safety precautions must be followed whenever any type of voltage or current connection is being made to the instrument.

Before connecting to electric circuits or pulse initiating equipment, open their related breakers or disconnects. It is recommended NOT TO install any connection of the instrument on live power lines. Only Qualified Service personnel that have demonstrated the abilities and received the proper safety training are capable of connecting to live circuits.
- Connections must be made to the instrument first, then connect to the circuit to be monitored.
- Wear proper personal protective equipment, including safety glasses and insulated gloves when making connections to power circuits.
- Hands, shoes and floor must be dry when making any connection to a power line.
Before each use, inspect all cables for breaks or cracks in the insulation. Replace immediately if defective.
If the equipment is used in a manner not specified in this user's guide, the protection provided by the equipment may be impaired.

Standard Accessories

Standard accessories
The following table lists the 3700 standard accessories.

Description Part Number
3760 Manual	92362.00
3760 Quick Reference Guide	92367.00
5 Pin connector, analog signals	25657-LF
8 Pin connector, transducer	25658-LF
10 Pin connector, logic	25606.00
* US Power Cord	USSTDCORD (900744)
* European Power Cord	EUROSTDCORD (115369-G1)
* United Kingdom Power Cord	UKSTDCORD (115368-G2)
* Australian Power Cord	AUSTDCORD (901347)
Desk top feet (4ca.)	35058.00
*User specified, one standard only.

1 GENERAL DESCRIPTION AND SPECIFICATIONS

The Model 3760 is a single-channel panel instrument for DC Voltage and 4-20mA sensors; intended for applications involving single ended or differential DC Voltage signals with ratings between 50 mV to 200.0 Vdc input full scale or 4-20mA inputs. The 3760 will supply excitation, conditioning and provide a calibrated Engineering Unit's display and analog output signals for the measurement of pressure, displacement, speed, load and other parameters associated with DC based sensors. The 3760 is front panel configurable with user selectable wide gain, zero, symmetry, and selectable analog output of voltage and current signals. Display is user configured and independently adjustable for engineering unit scaling up to ±199950 independent of the analog full scale signal.

The Model 3760 can be calibrated by the “two-point (dead-weight)” process involving known “zero” and “full scale” input parameters. A convenient “RCAL” front panel push button or rear panel connection is available for calibration verification.

FRONT PANEL VIEW OF 3760 CONTROLS (Front Display Cover Removed)

1. X. X. X. X 0 ÷1 9 9 5 0 FINE ADJUST ZERO SPAN C F C F 1.X. X.X.X 0/ 5000 ↓ 1 2 3 4 5 6 7 10000 ↑ ↓ 20000 ↓ ↑ DISPLAY SPAN C F OFF ZERO SPAN 1 2 3 4 5 6 7 SYM WIDE ADJUST ANALOG CTRL RCAL TARE

FINE ADJUST COARSE ZERO FINE ZERO COARSE SPAN FINE SPAN WIDE ADJUST ZERO SPAN SYMMETRY DISPLAY SPAN COARSE FINE RCAL Remote Calibration TARE ANALOG CONTROL SETTINGS 1 - VOLTAGE OUTPUT - 5.0 or 10.0 VDC 2 - CURRENT OUTPUT - 4-20 mA 3 - ANALOG FILTER - 20 / 200 Hz 4 - ANALOG FILTER - 20 / 2 Hz 5 - CURRENT INPUT - 4-20 / 4-12-20 6 - VDC INPUT RANGE SELECT 7 - VDC INPUT RANGE SELECT DISPLAY CONFIGURATION Sw 1,2,3,4 DECIMAL POINT PLACEMENT Sw 5 DUMMY ZERO Sw 6 & 7 DISPLAY RESOLUTION

3760 SPECIFICATIONS

Measurement Range: Adjustable; 0.050 mV to 200 VDC; or 4-20 / 4-12-20 mA nominal full-scale.

Transducer Types: DC Voltage or mA Current out (potentiometer, DC to DC LVDT)

Excitation: ± 12.0 Vdc (24 Vdc), up to 50 mA.

Power Supply: Voltage 90 - 250 VAC, 47 -63 Hz Consumption 10 Watts

Physical Parameters: 5.68" W x 2.84" H x 7.06" D; weight - 3.25 Lbs.

Analog Output: selectable; ±5, ±10 VDC, 4 -20 mA or 4 -12 -20 mA (20 % over -range on voltage outputs only)

Operating Temperature: 0 to +55 Degrees C, 5 to 95% relative humidity, non-condensing

Altitude: 2000m (6560 ft) maximum

Installation Category: Installation Category II, Pollution Degree 2

Amplifier
Common Mode:

Normal - Mode Range: ±5 V RMS operating; ±28 V without instrument damage
Input Impedance: Differential 200 kΩ	Range	C-M Range(V f.s.) (+/- V)
Offset: vs. Temperature: ±30 ppm μV/°C; vs. Time: ±10 ppm/month
Gain Accuracy: Limited only by calibration accuracy	0.050 - 0.400	5
	0.400 - 3.200	40
Gain Stability: vs. Temperature: ±30 ppm/°C; vs. Time: ±10 ppm/month	3.200 - 25.00	200
Linearity: better than ± 0.03% of full scale	25.0 0 - 200.0	200

Filter: 3-pole modified Butterworth; 3 dB down at 2 Hz, 20 Hz or 200 Hz; selectable. Fast output always enabled, 5 KHz response (J3 Pin 3).

Step-Response Settling Times for the 3760 (in milliseconds)

	3db Frequency	To within 1%	within .1%	within .02%
Fast Output	5000 Hz	0.14	0.10	0.08
Selectable Output	200 Hz	3.7	5.0	5.6
	20 Hz	37	50	56
	2 Hz	370	500	560

1.a PANEL MOUNTING

You can easily mount the instrument in your own precut panel. Cutout dimensions for a panel-mounted unit are standard DIN; panel thickness should not exceed 6 mm (0.24 in). Simply unscrew the two rear-panel CLAMP SCREWS and slide the CLAMP SLIDES rearwards out of their grooves (THE FRONT BEZEL NEED NOT BE REMOVED). Insert the unit through the panel cutout, from the front of the panel (if the unit has rubber feet, these will have to be removed). Then reinstall the CLAMP SLIDES, and tighten the CLAMP SCREWS until the instrument is securely mounted.

68 ± 0.7 mm (2.68 ± 0.03 in) 138 ± 1.0 mm (5.43 ± 0.04 in) CLAMP SLIDE CLAMP SCREW Panel Mounting

2 CONNECTIONS

The Model 3760 I/O CONNECTIONS are via removable screw terminals which will accept wire sizes from AWG 12 to 26. NOTE: The recommended transducer cabling would be twisted pair, individually shielded - wired as indicated (Fig. 6). Table 1 denotes screw terminal assignments

Rear Panel Connections

3760 N/C N/C HOLD TARE TARE ENABLE LOGIC COM R CAL N/C CM FAULT N/C + EXCITATION - EXCITATION mA ENB - mA W- + SIGNAL - SIGNAL EXC COMMON SHIELD VDC COM V OUT SEL V OUT FAST 4-20 mA COM 4-20 mA OUT

Table 1

Connector Screw Termi		nal Line
Number	Terminal	Label	Function
J1	1	N/C	No connection
J1	2	N/C	No connection
J1	3	HOLD	Input Analog Hold command
J1	4	TARE	Input Analog TARE command
J1	5	TARE ENABLE	External TARE enable input
J1	6	LOGIC COM	Logic Common
J1	7	R CAL	Remote Calibration Command
J1	8	N/C	No connection
J1	9	CM FAULT	Common Mode Fault output
J1	10	N/C	No connection
J2	1	+ EXCITATION	+ Excitation Power
J2	2	- EXCITATION	- Excitation Power
J2	3	mA ENABLE	Jumper Connection to Enable mA input
J2	4	- mA	- Negative 4-20 mA Input Signal from sensor
J2	5	+ SIGNAL	+ Signal Input (VDC or mA)from sensor
J2	6	- SIGNAL	- Signal Input from sensor
J2	7	EXC COMMON	Excitation common
J2	8	SHIELD	Case Shield for cable termination
J3	1	V OUT COM	- Signal Output Voltage Common
J3	2	V OUT SEL	+ Signal Output Voltage – Filter Select
J3	3	V OUT FAST	+ Signal Output Voltage – 5 kHz Filter
J3	4	4-20 mA COM	Current Output Common
J3	5	4-20 mA OUT	Current Output Signal

2 CONNECTIONS

J1 – RCAL Command Connections. Connection is used to remotely activate the positive calibration command from the rear panel. When the RCAL terminal is connected to LOGIC COM via a switch or relay, the 3760 meter will generate 80% of the full scale value as configured.

Fig. 4

LOGIC COM R CAL + N/O Switch

RCAL Command Connections

J1 - RCAL Activation Connections

Connecting LOG COMMON to the R CAL terminals will activate an internal voltage reference in place of the sensor's signal for simulated calibration & verification check of the 3760 settings and input operation.

J2 - HOLD & TARE Connections. Connection is used when external control of the "HOLD" and "TARE" features of the unit are enabled and are controlled by an external switch, PLC or relay. The LOG COM signal is used to activate the analog HOLD or Analog TARE (offset) to the meter's display and analog output signals present on J3.

Fig. 5

J1 Logic Controls

tton, Contact Relay, Switch.... when connected to LOGIC COMMON when connected to LOGIC COMMON

HOLD IN

Activates Analog HOLD when connected to LOGIC COMMON

TARE IN

Activates Analog TARE when connected to LOGIC COMMON

TARE ENABLE

Enables remote TARE and disables front panel TARE when connected to LOGIC COMMON

LOGIC COMMON

Connection to enable rear panel features

COMMON MODE FAULT

Logic Output. True when the input signal's Common Mode exceeds specifications.

Common Mode: Is the voltage level at which the input signal can be "floating" from earth common which the 3760 can function properly. If this level is exceeded, the "CMF" (terminal 9, J1) will go true (to ground), giving the user a remote status of the Common-Mode condition of the 3760 unit. Static condition of terminal 9 is TTL (+5 Vdc).

2 CONNECTIONS

Fig. 6 - Transducer Cabling - DC Voltage Input- J2 Connector

DC - DC LVDT DC Load / Pressure Sensors Amplified Sensors DC Powered Sensor 24 Vdc + Power - Power + Signal + EXCITATION + EXCITATION + mA ENB - mA -VW- + SIGNAL - SIGNAL EXC COMMON SHIELD Linear Potentiometers Zero Centered for Bi-Directional output Linear Potentiometer Sensor + EXCITATION - EXCITATION + mA ENB - mA -VW- + SIGNAL - SIGNAL EXC COMMON SHIELD Linear Potentiometer With Uni-Directional output Linear Potentiometer Sensor + EXCITATION - EXCITATION + mA ENB - mA -VW- + SIGNAL - SIGNAL EXC COMMON SHIELD Linear Transducer With 4-20mA output Linear Sensor + Power - Power - Signal + Signal + EXCITATION + EXCITATION + mA ENB - mA -VW- + SIGNAL - SIGNAL EXC COMMON SHIELD

WARNING

Qualified personnel who work on or near exposed energized electrical conductors must follow applicable safety related work practices and procedures including appropriate personal protective equipment in compliance with the Standard for Electrical Safety Requirements for Employee Workplaces (ANSI/NFPA 70E-2012) of USA and any additional workplace safety requirements applicable to your installation.

2 CONNECTIONS

J3 - Analog Connections Provides analog outputs from the meter's signal conditioning area in the form of ±5 Vdc or ±10 Vdc (selectable via the front panel controls) and 4-20 mA (or selectable 4-12-20 mA). Full scale output is referenced to the display "range" selected (5000, 10000, or 20000). I.e. If range 10000 is selected, the analog output will be 5 Vdc or 10 Vdc, as determined by the front panel controls (or 20 mA FS) when in the default – UP position.

graph TD
    A["Analog Voltage Output\n+/- 5 Vdc or +/- 10 Vdc with fixed cutoff filter @ 5 KHz"] -->|+ SIGNAL| B["Pin 1"]
    A -->|- SIGNAL| C["Pin 2"]
    D["Analog Voltage Output\n+/- 5 Vdc or +/- 10 Vdc with front panel selectable cutoff filter @ 2/20/200 Hz"] -->|+ SIGNAL| E["Pin 3"]
    D -->|- SIGNAL| F["Pin 4"]
    G["Analog Current Output\n4-20mA, 4-12-20mA at selected cutoff filter"] -->|+ SIGNAL| H["Pin 5"]
    G -->|- SIGNAL| I["Pin 6"]

J3 - Analog Output Connections

Pin 1 V Out Common (- Signal out) reference for Pin 2 and Pin 3 + Signal Voltage Output.

Pin 2 Voltage Output Selected (+Signal out) reference to Pin 1. The Full Scale Voltage is determined by the position of switch 1 -VDC on the Conditioner Controls. Output response is determined by the position of switch 3-FIL and 4-FIL on the Analog Controls.

Pin 3 Voltage Output Fixed. (+ Signal out) reference to Pin 1. Full Scale Voltage is determined by the position of switch 1-VDC of the Conditioner Controls. Filter response is fixed at the highest analog signal response of 5 KHz.

Pin 4 4-20 mA Current Output at Common (- Signal) reference for Pin 5 Current Output.

Pin 5 4-20 mA Current Output (+Signal) reference to Pin 4 Current Output Common. The Current Output is selectable for 4 - 20 mA or 4-12-20 mA as determined by the position of switch 2 -mA of the Conditioner Control switch(s) on the front panel.

3 CONTROLS

Display Range and Decimal Point Selection

1. X. X. X. X 0 ÷1 9 9 9 5 0 FINE ADJUST ZERO SPAN C F C F ↑↑↑↑↑↑ 1. X. X. X. 0 5000 ↓ ↓ 1 2 3 4 5 6 7 10000 ↑ ↓ 20000 ↓ ↑

Switch 1 - selects decimal point for position X.XXXXX

Switch 2 - selects decimal point for position XX.XXXX

Switch 3 - selects decimal point for position XXX.XXX

Switch 4 - selects decimal point for position XXXX.XX

Switch 5 - enables dummy zero display digitXXXX0

Switch 6 & 7 - selects Display Full Scale Range

Range will equate to an analog output value of ±5 Vdc or ±10 Vdc per Analog Control switch placement. Selection is set for 1 count in 5000, 2 counts in 10000 and 5 counts in 20000.

Analog Zero and Span Adjustments

FINE ADJUST ZERO SPAN C F C F 1 2 ↑ ↑ 1.X.) ZERO WIDE

Coarse Zero - 22 Turn potentiometer adjustment for balance control of analog offset signal

Fine Zero - 25 Turn potentiometer for fine balance control of analog offset signal

Coarse Span - 22 Turn potentiometer adjustment for analog control of gain (approx. +/- 11% authority)

Fine Span - 25 Turn potentiometer adjustment for analog control of fine gain

3 CONTROLS

Analog Wide Span and Zero Controls

16 Position switch for wide control adjustment of the analog output signal from the 3760 meter, this in turn affects the digital readout for engineering units adjustments as determined by the display settings.

1 2 3 4 5 6 7 10000 ↑ ↓ 20000 ↓ ↑ 1. X. X. X. X B ZERO SPAN 1 2 3 4 5 6 7 SYM WIDE ADJUST ANALOG CRTL DJUST AVENUEAU D

Wide Zero - 16 position switch to adjust wide zero-balance authority, approx. 13% /position Wide Span - 16 position switch to adjust wide range gain for 0.050 mV to 200 Vdc sensors

Display Span Adjustments

The Display Span Adjustment is used to adjust the digital readout of the 3760 meter; the user calibrates the analog output for a specific span value and then adjusts the readout for proper engineering units display. "OFF" position indicator defines the default position. i.e. 5.000 Vdc for the analog outputs equals to 5000 counts on the display.

DISPLAY SPAN C F OFF SYM RCAL TARE

Display Coarse Span - 16 position switch to adjust wide span / gain authority for the display

Display Fine Span - 25 Turn potentiometer for fine span / gain control of display reading

Display "OFF" – switch position "F" which disables the Adjustable Span feature of the display

3 Controls

Analog Control Settings

Front panel controls configure the main parameters of the Signal conditioner for input type, mode of the analog output signal, low pass filter characteristics and full scale voltage input range.

1 2 3 4 5 6 7 10000 1 X. X. X. X. B 20000 ZERO SPAN 1 2 3 4 5 6 7 SYM WIDE ADJUST ANALOG CRTL DJUST D

1 - 5 Vdc Output - UP sets the analog output FS to 5 Vdc, DOWN is 10 Vdc
2 -4 - 20 mA Output - UP sets the analog current output for 4-20 mA, DOWN is 4-12-20ma
3 - 20/200 Hz - UP selects 20 Hz filter. DOWN selects 200 Hz filter
4 - 20/2 Hz - UP selects 20 Hz filter. DOWN selects 2 Hz filter
5 - 4-20 mA Input - UP selects 4-20 ma Input. DOWN selects 4-12-20 mA Input
6 - VDC Input - Full Scale Range Select switch, 50 mV to 200 Vdc
7 - VDC Input - Full Scale Range Select switch, 50 mV to 200 Vdc

With all switches in the UP position, the unit will have the following settings:

• 5 Vdc Analog voltage output full scale
• 4-20 mA Analog current output full scale
• The Analog low pass filter will be set for 20 Hz
- 4-20 mA input is selected – requires proper input wiring. Refer to page 5 for diagram
• VDC Input Range set for 3.20 to 25.0 Vdc input

Analog Control Settings for Conditioner Configuration

↑Up	Function	Down ↓
5	1- VDC OUT	10
4-20	2 - mA OUT	4-12-20
20 Hz	3 - FILTER	200 Hz
20 Hz	4 - FILTER	2 Hz
4-20	5 - mA IN	4-12-20
RANGE VDC INPUT 6 7
1	0.05 - 0.40	↓	↑
2	0.40 - 3.20	↑	↓
3	3.20 - 25.0	↑	↑
4	25.0 - 200.0	↓	↓

Analog Control Settings

Switch 6 and 7 are used to select one of the four expected DC Voltage Input Ranges of the meter. The adjustability within the selected range will be accomplished via the Wide Span, Coarse Span and Fine Span controls.

When the input is 4-20mA, the correct input Range is auto-selected

3 Controls

Analog Symmetry, RCAL, TARE

5000 0000 0000 1567 SYM DG CRTL DISPLAY SPAN C F OFF RCAL TARE

SYM

Symmetry - Adjust the negative gain slope for symmetrical analog adjustment and display reading with reference to the positive span value. 20 Turn potentiometer, with approx. +/- 2% full scale authority

RCAL

Remote Calibration - Activates the Positive voltage calibration reference. Value is determined by the rear rotary switch located behind the rear panel. See details after Section 4 - calibration.

TARE

Push / Push switch. When enabled, offsets the present sensor signal input to "Zero". When activated, a green LED light will illuminate. During activation process, LED will light Yellow. If disabled, or out of range, LED will be RED. TARE maybe remotely activated via rear J1 connections. Front panel TARE can be disabled via J1 Pin 5 connected to Logic Common, Pin 6.Maximum TARE capability is approx. 60% of full scale reading.

4. CALIBRATION

This section contains the instructions for calibrating the 3760. Included is a functional description of the instrument front-panel (see Page 1). To perform calibration, proceed as follows.

(a) Connect Sensor and Analog terminals as required. Connect and apply power to the unit. The front-panel digital display should light indicating the application of the AC input power. Allow 10 minutes of warm up for stabilization of transducer characteristics. Remove the front cover of the 3760 unit by removing the two small Phillips screws on the front panel. TARE button should not be activated.
(b) Center the Zero and Fine Span potentiometers by rotating the potentiometers CW until you feel the “end stop” or by the number of turns accomplished (Coarse is 22 turns, Fine is 25 turns). Rotate the potentiometer back to the middle of their range (Coarse 11 turns, Fine 12-13 turns). This will establish the mid-authority adjustment of the potentiometers.
(c) Position the front panel switches to the desired settings for the application. Refer to Section 3 for details.
(d) Relax the sensor or voltage input to “zero” and adjust the Wide Zero and Fine Zero controls until the meter reading is achieved at the point which will be the “zero” value reference.
(e) Once the Zero position has been established, apply a known input to the meter. With the input active and stable, adjust the Wide Span, Coarse Span and Fine Span controls until the display reading required is achieved.
(f) Return the sensor to the "Zero" position and re-adjust the Coarse Zero and Fine Zero controls for the desired reading or analog output of the unit. Repeat the Span (step e) adjustment as necessary to achieve the proper reading or analog output. Note that changes in Span (Gain) will affect Zero. Span and Zero re-adjustments may need to be repeated to obtain the desired reading. (Note that the 3760 meter also has independent display adjustment capability to where the digital display can be adjusted independently to the analog output signal of the unit so as to achieve maximum analog output levels from the meter.)
(g) Once the Zero and the Gain (SPAN) adjustments have been accomplished, if needed -the user can adjust for Negative non-symmetrical value (as referenced by the positive SPAN value) by utilizing the front panel Symmetry control when the input to the meter is Negative - adjust the symmetry control for the correct readout or analog output signal required. Note the Symmetry control has approx. ± 2 % full scale authority.
(h) Once completed, record the position of the "Wide Span" control setting (0 thru F). This setting position will be used to set the internal RCAL switch as described below under "Front Panel Calibration (RCAL) setting" instructions.
(i) Replace the front display lens cover to the original position and ensure proper shielding and grounding have been done to the meter.

Display Calibration The 3760 instrument display has separate adjustment controls that are independent of the analog output controls - allowing the user to alter the display reading to a value that is suited for the display while maintaining the flexibility to adjust the analog signal as needed for external devices. In the standard - default switch position (as marked on the Coarse Span control area), the display has a fixed full scale reading set by the display range switches of 5000, 10000 or 20000 counts. At these settings the full scale analog output signal will be 5 Vdc or 10 Vdc, as selected. To accomplish the display adjustment change, the user would first set the desired display range and decimal location using the display dip switches, adjust the analog output to the desired level and then adjust the Display Coarse and Fine span controls for the required digital readout.

Tech Tip on use of wide range settings for the DC Voltage Conditioner

Due to multiple amplifier stages within the 3760 instrument, attention to the proper gain setting and understanding of the sensor inputs should be reviewed to produce a linear-amplified analog output signal and display reading.

The wide span – gain control (as shown in the front panel diagram) has 16 positions to amplify the incoming signal by incremental steps. Each step is positioned so the Coarse and Fine Span potentiometer controls overlaps each step to provide a continuous linear gain of the signal from 50 mVdc to 200Vdc full scale. Below is a table of each wide gain steps, indicating the nominal low and high input signal range per position – full scale in millivolts DC to the meter.

Wide Span Control table for Low and High Input DC Voltage adjustment per Front panel Range selection

	0.05 - 0.400Range 1		0.40 - 3.20Range 2		3.20 - 25.0Range 3		25.0 - 200.0Range 4
	F	0.045	0.056	0.355	0.440	2.84	3.52	22.75
E	0.052	0.064	0.412	0.513	3.30	4.10	26.40	32.80
D	0.060	0.074	0.480	0.592	3.84	4.75	30.70	38.00
C	0.068	0.085	0.544	0.678	4.35	5.42	34.80	43.35
B	0.078	0.096	0.624	0.768	5.00	6.15	40.00	49.20
A	0.089	0.110	0.714	0.880	5.72	7.00	45.75	56.00
9	0.103	0.128	0.824	1.024	6.60	8.20	52.80	65.60
8	0.118	0.147	0.944	1.176	7.55	9.40	60.40	75.20
7	0.135	0.168	1.080	1.344	8.65	10.75	69.20	86.00
6	0.155	0.190	1.240	1.520	9.92	12.15	79.35	97.20
5	0.178	0.220	1.424	1.760	11.40	14.05	91.20	112.4
4	0.202	0.250	1.616	2.000	12.95	16.00	103.6	128.0
3	0.232	0.285	1.856	2.280	14.85	18.25	119.0	146.0
2	0.266	0.330	2.128	2.640	17.00	21.10	136.0	169.0
1	0.310	0.385	2.480	3.080	19.85	24.65	159.0	197.0
0	0.355	0.440	2.840	3.520	22.75	28.10	182.0	225.0

5	1– VDC OUT	10
4-20	2 – mA OUT	4-12-20
20 Hz	3 – FILTER	200 Hz
20 Hz	4 – FILTER	2 Hz
4-20	5 – mA IN	4-12-20
RANGE VDC INPUT 6 7
1	0.05 – 0.40	↓	↑
2	0.40 – 3.20	↑	↓
3	3.20 – 25.0	↑	↑
4	25.0 – 200.0	↓	↓

Front Panel Range Switch Settings (refer to page 9)

FRONT CALIBRATION (RCAL) setting

The 3760 contains a "calibration switch" which is accessed by removing the rear panel of the instrument. This switch is used to set the range of the front panel pushbutton (and rear remote control) of the CAL / Remote CAL function of the 3760 instrument. The "calibration" switch is recommended to be set at the same value (0 thru F) as the front panel's "Wide Span" control. At this setting, the internal voltage reference will produce approx. 80% of the full scale value of the calibrated unit. This allows the user to produce a reference check of the instrument's calibration integrity.

Procedure should be done once the instrument has been calibrated per the instructions above.

To access the "calibration switch":

1) Remove power from the instrument.
2) Record the position of the front panel "Wide Span" control..... 0 thru F position.
3) Remove the 4 phillips head screws retaining the back panel of the instrument
4) Remove the rear panel (with slides) and rotated away from the instrument. Locate the blue rotary switch to the bottom right of the instrument and set the switch to the "Wide Span" control position as noted in Step 2.

When complete, re-assemble the back panel and slides.

Re-energize the instrument.

With your "zero" input active, depress the front "CAL" button, or the rear panel "Remote CAL" logic and record the value on the display. This will be your calibration reference number. If any changes are made to the front panel controls, this reference number will change reflecting a "calibration" change has occurred to the 3760 unit.

Internal Calibration Range switch

Rear Panel 3760

5. FUSE REPLACEMENT

Should you suspect a blown fuse proceed as follows.

WARNING

Installation, operation and maintenance of this instrument must be performed by qualified personnel only. The National Electrical Code defines a qualified person as “one who has the skills and knowledge related to the construction and operation of the electrical equipment and installations, and who has received safety training on the hazards involved.”

a) Disconnect all power sources and cables connected to the instrument before servicing the instrument.
b) On the rear panel I remove the (2) clamp slide retaining screws and remove the clamp slides from both sides of the instrument. Next remove the (4) corner screws that retain the rear panel to gain access to the instrument.
c) Open the rear panel and replace the fuse(s) as required, replace only with same type T Slow Blow, 1A, 250V (Littelfuse 218001.HXP, 1 A). The fuseholder wire conductors are appropriately labeled "L" for Line and "N" for Neutral on both halves of each of the fuseholder wires. When reassembling the fuseholder(s) make sure "L" and "L" are connected together and "N" and "N" labeled wires are connected together properly.
d) Mate the rear panel to the enclosure and replace the clamp slides back in position and secure the clamp slides with the (2) screws previously removed from the instrument. Next, replace the (4) corner screws to secure the rear panel and ensure that all screws have been adequately tightened.
e) Power ON the instrument with the appropriate power cord and verify the instrument is functioning properly before reconnecting the instrument to your installation.

WARNING

For continued protection against risk of fire or shock replace only with the same type and rating of fuse.

ADVERTENCIA

Do not replace fuse again if failure is repeated. Repeated failure indicates a defective condition that will not clear with replacement of the fuse. Refer condition to a qualified technician.

ADVERTENCIA

Product Warranty and Repair

Daytronic Corporation warrants its products to be free from defects in material and workmanship, under normal and proper use in accordance with our instructions, for the period of time specified below. Our liability under such warranty or in connection with any other claim relating to the products shall be limited to, at our option, the repair or replacement of any products or parts or components thereof which are returned to us freight prepaid and which are defective in material or workmanship or the refund of the purchase price to the Buyer.

ANY PRODUCT FOUND TO BE DAMAGED THROUGH CUSTOMER NEGLIGENCE OR MISUSE MAY BE EXCLUDED FROM ANY AND ALL POLICIES CONTAINED IN THIS DOCUMENT.

ALL EQUIPMENT TO BE REPAIRED OR REPLACED UNDER WARRANTY MUST BE RETURNED TO THE FACTORY. Before returning a product or products for any reason, the customer must call Daytronic Customer Support Services at [phone] to request a RETURN MATERIAL AUTHORIZATION (RMA). Once the customer has provided the necessary information and has been assigned a specific RMA, the product(s) in question may be returned to Daytronic by shipping it

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3700 SERIES

"P" Option

ANALOG PEAK CAPTURE

INSTRUCTION MANUAL

DRYTRONIC 3760 DC +4.9860 c f c f ZERO SPAN +CAL TAPE

3700

Instrument Series

3700 SERIES

"P" Option

ANALOG PEAK CAPTURE

INSTRUCTION MANUAL

1. General Description

The "P" option of the 3700 Series Meter is an added function card which provides the ability of the meter to capture and hold + Peak, -Peak, Max-Min or TIR value that originates from the base 3700 instrument. Any 3700 (except Horsepower 3741) can accommodate the "P" option. Peak Mode signals are captured in real-time analog capacitive memory and are available for display and analog output monitoring. Only one of the following four separate modes can be configured for the Peak Capture operation.

PEAK MODE
Description

+ PEAK	Captures and holds the most positive measurement signal in the positive quadrant
- PEAK	Captures and holds the most negative measurement signal in the negative quadrant
MAX + MIN	Captures and holds the sum of the MAXIMUM and MINIMUM signal values
TIR	Captures and holds the difference in the Positive and Negative Peak values only in the positive signal quadrant of the measurement

Peak functions are configured using the rear panel dip switches and connector terminals as illustrated in figure 1. Dip switch configuration enables various features - front panel TARE push button function, Peak Mode selection, Analog signal source of either the Fast or Select signal from the main 3700 unit, and Threshold detection levels for Have Peak Capture and logic triggering.

Rear panel connector terminals are used for remote control using logic switches or PLC type I/O control to activate / reset meter functions. Logic I/O signals for Peak Arming and Clearing (tracking) of the Peak capture value, switching the display from Live to Peak, Have Peak output and front panel enabling of the TARE switch for Peak/Reset of the captured value. The resultant analog captured signal is available via the "PEAK" connector terminal as noted in section 3 - Connections.

Fig. 1 3700P Peak Capture Option - Rear Panel Layout

INPUT 85-264~.5A 47-63Hz www.daytronic.com SYNC M/S ENABLE HOLD TARE TARE ENABLE LOGIC COM R NULL N/C N/C N/C ANALOG SEL PEAK SEL PEAK SEL DISPLAY TARE SW TRESHOLD HV PK LEVEL HAVE PK LOGIC TRACK/PEAK TRACK/HOLD LOGIC COM DISPLAY SEL TARE SW SEL VDC COM VOUT PEAK THRESHOLD + EXCITATION - EXCITATION + SENSE - SENSE + SIGNAL - SIGNAL CENTER TAP SHIELD VDC COM V OUT SEL V OUT FAST 4-20mA COM 4-20mA OUT

Threshold adjustment potentiometer located to the right of the Peak I/O connection is used for level adjustment of the "Have Peak" detection around the input signal's Zero level. This adjustment is used to prevent low-level signal content from triggering an inadvertent "Peak Hold". Adjustment level is viewable from the front panel (SW 6 Down) and is adjustable from 1 to 8% of full scale.

2. DIP Switch Configuration

Located on the rear panel above the main board connections, the 7 position dip switch configures the PEAK functions of the meter. The Default position of the switch is in the UP (ON) position as noted in the table below.

ON 1 2 3 4 5 6 7

Viewed from the rear. Switch "Rocker" in the UP position, is ON and considered the Default function as described below.

Default Position - Switches are all "ON" (UP)

Analog Signal Source	FAST analog signal response from main 3700
PEAK Mode	+ PEAK Mode of operation, see Fig 4
Display Reading	LIVE measurement signal is displayed
Front Panel TARE	Normal TARE switch operation
Peak Capture	1% of Full Scale between Live and Peak level detection

Switch #

Function

1 ANALOG SIGNAL SOURCE
Selects FAST or SELECTED analog signal source from the main 3700 unit.
2 PEAK MODE
Used with switch 3 for PEAK Mode function - +PEAK, -PEAK, MAX+MIN, TIR
3 PEAK MODE
Used with switch 2 for PEAK Mode function - +PEAK, -PEAK, MAX+MIN, TIR
4 DISPLAY
Selects LIVE Reading or PEAK Reading for the front panel display
5 FRONT PANEL TARE SWITCH
Selects the front panel TARE switch for TARE or PEAK/RESET function
6 PEAK THRESHOLD DISPLAY ADJUST
7 HAVE PEAK DETECT
Analog delta detection level for PEAK capture detection - (Backout level 1% or 0.1% Full Scale)

Switches the front panel display to adjust the level for HAVE PEAK THRESHOLD (Switch 4 to LIVE)

Switch # Default - UP (ON)

DOWN (OFF)

1 FAST Analog Signal

SELECT Analog Signal (low pass filtered selected) per main analog controls of the 3700 base unit.

2 + PEAK - UP

- PEAK - DOWN

MAX + MIN - UP

TIR - DOWN

3 + PEAK - UP

- PEAK - UP

MAX + MIN - DOWN

TIR - DOWN

+ PEAK

MAX + MIN
* see note

- PEAK

TIR
* see note

4 LIVE display

PEAK Display

5 Front Panel TARE - normal operation

Front Panel TARE used for PEAK / RESET

6 Standard Run-Time Operation

Selects THRESHOLD display adjustment

7 1% Full Scale Peak "Backout" Detect

0.1% Full Scale Peak "Backout" Detect

* Note: When in the Max-Min or TIR mode, the signal may over-range due to the sum of the +/- Peak captured signals being greater than full scale. Nominal capture level should be in the area of 50% full scale or less.

Functional Block Diagram of the PEAK switch settings

graph TD
    A["3700 Main Unit's Signal conditioned Analog Signal (0 - ±5 or ±10 Vdc)"] --> B["FAST"]
    B --> C["Switch #1"]
    C --> D["MODE Selection Switch #2 & 3"]
    D --> E["PEAK Option"]
    E --> F["TARE Switch"]
    F --> G["BACKOUT Level for Peak Detect"]
    G --> H["Threshold Potentiometer"]
    H --> I["LIVE Value"]
    I --> J["Switch #4"]
    J --> K["Switch #6"]
    K --> L["3700 Display"]
    M["Front Panel TARE Switch Push - Push"] --> N["NORMAL"]
    N --> O["Switch #5"]
    O --> P["PEAK-TRACK"]
    P --> Q["Switch #7"]
    Q --> R["1% Backout Level for Peak Detect"]
    R --> S[".1%"]
    S --> T["Threshold Potentiometer"]
    T --> U["PEAK Analog Output (0 - ±5 or ±10 Vdc)"]
    U --> V["Analog Amplitude Level"]

3. PEAK Interface I/O Connections

Pin assignments for the 3700P board's 8-pin I/O connector (shown in Fig. 1) functional description

Pin Number
Function

1	Output	HAVE PEAKOutput Logic Signal, indicates a Peak has been detected.
2	Input	TRACK or PEAKInput Logic Signal to Clear (Track) or to Arm for a Peak capture function
3	Input	TRACK or HOLDInput Logic Signal to HOLD the Peak reading. Must be in Track Mode to clear Peak (Pin 2 false, not grounded)
4		LOGIC COMMONCommon for Logic signal activation
5	Input	DISPLAY - LIVE or PEAK ReadingInput Logic Signal to select Live Reading or Peak Reading for front panel display
6	Input	FRONT PANEL TARE for Display of PEAK or LIVE signalInput Logic Signal to use the front panel TARE switch for PEAK or LIVE display reading
7		ANALOG COMMONCommon for analog signal reference
8	Output	PEAK ANALOG SIGNALAnalog Output - Holds PEAK analog value when in PEAK mode; follows analog input continuously when in TRACK mode. Full scale level is determined by the 3700 main units output selection - +/- 5V or +/- 10V.

4. Setup conditions for the "P" option and TARE switch operation

When the "P" option is installed - the front panel "TARE" Push/Push switch can be configured to operate in three separate function modes for local operation depending on the DIP switch selection and/or logic inputs selected.

Function Mode of the TARE switch

1. Standard "TARE" capability for normal operation - Will TARE the input measurement of the analog signal and the display to "Zero". LED will light GREEN when active and within normal offset TARE range. Remote TARE via the rear connector functions in a similar fashion.
2. PEAK capture or Track mode - When the TARE switch is depressed, the meter will be in "track" mode following the input signal amplitude. When the TARE switch is released (outward position) the meter is armed and ready to capture the Peak as configured by Dip Switch 2 & 3.
3. Used for local control of the Front Panel display -TARE button depressed will display the PEAK reading. Outward position of the switch will display the "Live" reading. Switch action will not perform a Peak reset operation, this must be done via connection terminal 2's activation for TRACK - PEAK.

Note: If the Peak option is installed in a Model 3740 Frequency conditioner, the TARE mode switch functionality is only accessible via the rear logic connector input

Function Mode Setup and configuration details

1. Standard TARE operation Default condition

- Dip Switch 4 & 5 UP, Peak Input connection Pin 5 and 6 are not used. Remote connections for remote TARE are available. Refer to the main meter manual for details.

2. Front Panel Peak Reset Function

- Dip Switch 4 & 5 DOWN or Switch 4 DOWN and Input connection Pin 5 Grounded (True). Input connection Pin 6 can not be used. Remote TARE function operates via main meter connector.

3. Local Display of Live or Peak Reading

- Dip Switch 4 & 5 UP, Input connection Pin 5 not utilized, Pin 6 is grounded (True). Remote TARE function operates via main meter connector.

4. Interface I/O Connections

Interface Connector Operation

The 8 pin rear connector provides remote access to the Peak operational parameters. All logic I/O are negative true signals - logic common when active or true.

Functional diagrams of the logic for enabling PEAK functions are shown in Fig. 3 thru 6. Typically usage of the I/O connections are for remote control of the application sequence to "handshake" with a controller for proper operation of the measurement capture and resetting process of the PEAK Mode function.

Display Source and Front Panel TARE button mode of operationl are available to provide remote control enabling of the local operation of the 3700 Peak features as configured by the 7 postion dip switch settings as described in section 2.

Analog Output of the PEAK Mode function is available. The Analog level is dependent on the configuration of the main analog controls of the 3700 unit... +/- 5 V or +/- 10 Vdc full scale level. Analog output, when in the HOLD or PEAK capture mode, is accomplished using capacitive memory and will have a "leak" rate of 1 millivolt per 10 seconds.

Fig. 2 Track/PEAK Via External Command (Switch, Open Collector Transistor, or TTL Logic)

2 (TRACK) 4 (COMMON)

2 (TRACK) 4 (COMMON)

graph TD
    A["2 (TRACK)"] --> B["TTL"]
    C["4 (COMMON)"] --> B["TTL"]

+ PEAK Mode - captures and holds the most positive signal amplitude of the measurement within the positive quadrant of the signal. Switch 2 UP - Switch 3 UP

Fig 3

- PEAK Mode - captures and holds the most negative signal amplitude of the measurement within the negative quadrant of the signal. Switch 2 DOWN - Switch 3 UP

Fig 4

MAX + MIN Mode - captures and holds the most positive signal and the most negative signal amplitude in the positive and negative quadrants of the measurement resulting in an absolute analog output signal. Switch 2 UP - Switch 3 DOWN

Fig 5

Note: When in Max-Min mode the analog signal may overrange due to the summing of the + Peak and - Peak captured signal.

TIR Mode - captures and holds the most positive signal and the most negative signal amplitude in the positive quadrant of the measurement. Switch 2 DOWN - Switch 3 DOWN

Fig 6

Threshold Level Adjust and Have Peak Detection (Backout)

Switch 6 - PEAK THRESHOLD DISPLAY ADJUST on the rear panel dip switch: When in the DOWN position, will switch the front panel display to provide level adjustment of the Threshold Potentiometer to provide a "No Peak Zone" around the Zero level. This adjustment is used to eliminate false Peak Captures around the zero measurement level as shown in the gray area of the Fig. 7 below. Adjustment is from 1 to 8% of the full scale reading.

Switch 7 - HAVE PEAK DETECT (Backout): Selects the amplitude of the "delta" between the live signal and the detection of a Peak value which has occurred. Sometimes referred to as "Backout" as shown in the circle graphics below. This level sets the recognition level of when a PEAK has occurred. Level is 0.1% (DOWN) or 1.0% (UP) of full scale. Setting will depend on signal dynamic content and the sharpness of the peak event. Placement of Switch 1 (Analog Signal Source) will also have an affect on this setting due to the analog filtering response of the FAST or the SELECTED analog signal as determined by the response time of the FAST signal for the 3700 Model or the Select Analog Filter per the Analog Control switches located on the main 3700 unit.....switch 3 & 4.

Fig 7

graph TD
    A["Input"] --> B["Threshold Adjustment – Peak Defeat Zone (1-8% FS)"]
    B --> C["Output (+ PEAK)"]
    D["+ Full Scale"] --> E["Switch 7 Backout Level"]
    E --> F["Have PEAK Detect"]
    F --> G["0.1 or 1% Full Scale (Switch 7)"]
    G --> H["Output"]
    I["ZERO Level"] --> J["Switch 6 for display adjust level"]
    K["Logic Inputs"] --> L["Track / HOLD"]
    M["Logic Output"] --> N["Have PEAK"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333
    style E fill:#cff,stroke:#333
    style F fill:#ffc,stroke:#333
    style G fill:#fcf,stroke:#333
    style H fill:#cff,stroke:#333
    style I fill:#fff,stroke:#333
    style J fill:#fff,stroke:#333
    style K fill:#fff,stroke:#333
    style L fill:#fff,stroke:#333
    style M fill:#fff,stroke:#333
    style N fill:#fff,stroke:#333

Quick Set-up operation

1. Determine the Peak Mode required

Configure switch settings 2 and 3 for the proper function.

2. Select FAST or SELECT signal source

Configure switch 1 - FAST will be the highest dynamic capture. SELECT will reflect the low pass filter selection on the main 3700 Analog Controls.

3. Select the Front Panel Operation of the TARE Switch

Configure switch 5 - Normal operation of the TARE switch to provide "zero-ing" of the analog signal or to use the TARE switch as a front panel PEAK -TRACK "push-push" operation to place the 3700 unit is PEAK capture Mode or Reset the PEAK that has been held resulting in the display and analog output signal tracking the live input. Push IN - PEAK. Push OUT - TRACK.

4. Select the Operation of the Display

Switch 4 - Meter display can be configured for LIVE display or the PEAK capture value. If the unit is a "stand-alone" meter with the local operator providing the Peak Reset, as mentioned in step 3, then Switch 4 should be DOWN for PEAK display operation. Remote control of the display can also be done via the I/O connections with an external switch or controller providing the Display control function.

5. Determine how much "threshold" level is needed for your application

Switch 6 will display the threshold value (1 to 8%) for a bi-polar "no peak detection zone" around the Zero measurement level. This adjustment is normally in the 5% area, but can be adjusted depending on the application and how much PEAK defeat / rejection is needed. When finished with the potentiometer adjustment, return Switch 6 to the UP position.

6. Determine the need for remote control of your application

Refer to the Connector I/O interface in section 3 for setup functions of the 8 positon terminal connector. Switch function 4 and 5 can be remotely controlled. All other switch settings are typically configured during initial setup of the 3700 unit and will not be changed.

Peak Capture Response

The Peak Capture of the analog signal is performed using “capacitive” memory. This technique is very repeatable and does not involve digital sampling errors. It does, however, result in a millivolt/second “leak rate” after the initial “capture” which varies depending on the Peak Capture cycle rate, amplitude of the analog signal and the wave shape of the signal being monitored. Below are the leak rate values as expressed in percent of full scale using defined parameters of a single square wave pulse input of 1, 10 and 100 milliseconds in duration at the full scale value of 5.000 V.

Square Wave Full Scale Error after Peak was captured

Pulse Width	10 mS	100 mS	1 Sec
1 mS	0.10%	0.15%		0.20%
10 mS	0.05%	0.07%	0.10%
100 mS	0.02%	0.02%	0.06%

Typical Leak rate graph with a 100 mS pulse example

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