380941 - Measurement Extech - Free user manual and instructions

Product Type	Digital Multimeter
Model	380941
Brand	Extech
Display	4000-count LCD with backlight
AC Voltage Range	0.1 mV to 600 V
DC Voltage Range	0.1 mV to 600 V
AC Current Range	0.1 µA to 10 A
DC Current Range	0.1 µA to 10 A
Resistance Range	0.1 Ω to 40 MΩ
Capacitance Range	0.01 nF to 100 µF
Frequency Range	0.01 Hz to 10 MHz
Temperature Range	-20°C to 1000°C (-4°F to 1832°F)
Diode Test	Yes, with 1 mA test current
Continuity Test	Audible beep for resistance < 50 Ω
Safety Rating	CAT II 600V
Power Supply	9V battery (6F22, included)
Dimensions	180 x 85 x 40 mm
Weight	320 g (including battery)
Accessories Included	Test leads, thermocouple, battery, manual
Maintenance	Clean with dry cloth; remove battery if not used for extended periods
Repairability	Replaceable battery and fuse (F 500mA/600V)

Frequently Asked Questions - 380941 Extech

How do I measure AC voltage with the Extech 380941?

Turn the rotary switch to the AC voltage range (V~). Insert the black lead into COM jack and red lead into V/Ω/Hz jack. Connect the probes to the circuit and read the display. The meter automatically selects range.

How do I replace the battery in the Extech 380941?

Turn off the meter and remove the test leads. Remove the battery compartment screw on the back. Lift the cover and replace the 9V battery with a new 6F22 type. Ensure correct polarity and reattach the cover.

What is the maximum input voltage for the Extech 380941?

The maximum input voltage is 600V DC or AC RMS. To avoid damage, do not exceed this limit. The meter is rated for CAT II 600V.

How do I test continuity with the Extech 380941?

Set the rotary switch to the continuity/diode position (usually marked with a diode symbol). Insert the black lead into COM and red lead into V/Ω/Hz. Connect probes across the circuit. An audible beep sounds when resistance is below 50 Ω.

How do I measure resistance?

Turn the dial to the resistance range (Ω). Insert black lead into COM and red lead into V/Ω/Hz. Disconnect power from the circuit. Touch probes to the resistor and read the value. For accurate reading, ensure no parallel paths.

How do I measure capacitance?

Set the switch to the capacitance range (F). Insert capacitors into the dedicated test terminals (or use leads if provided). Discharge the capacitor first. Connect the probes and read the value. The meter may take a few seconds to stabilize.

How do I use the temperature function?

Set the rotary switch to the temperature range (C/F). Insert the thermocouple into the input jacks (usually COM and V/Ω/Hz or dedicated temp jacks). Place the probe on the object and read the temperature. The meter supports K-type thermocouple.

What does 'OL' mean on the display?

'OL' stands for Overload. It indicates the input exceeds the selected range. Switch to a higher range or check if the input is too high. For voltage/current, it may mean overrange; for resistance, it can mean open circuit.

How do I clean the Extech 380941?

Use a soft, dry cloth to clean the housing and display. Do not use solvents or abrasives. Keep the input jacks free of dirt. For stubborn spots, slightly dampen the cloth with water. Ensure the meter is off and disconnected.

How do I check or replace the fuse?

Turn off the meter and remove test leads. Open the battery/fuse compartment. The fuse is a F 500mA/600V fast-blow type. If blown, replace with same rating. Close the compartment. The fuse protects the current ranges.

USER MANUAL 380941 Extech

Congratulations on your purchase of Extech's DC/AC Clamp Meter. This professional meter, with proper care, will provide years of safe reliable service.

Front Panel Description

1. Current sense jaw
2. Measurement Trigger
3. Function switch
4. Data Hold key

5. Max Min key

6. One-touch DCA zero key

7. LCD Display
8. 40 segment bargraph display
9. Positive input terminal for V, HZ and Ω
10. COM terminal

International Symbols

Caution! Refer to the explanation in this Manual

Caution! Risk of electric shock

Earth (Ground)

Safety

This meter has been designed to be safe in use, but the operator must use caution in its operation. The rules listed below should be carefully followed for safe operation.

1. NEVER apply voltage or current to the meter that exceeds the specified maximum:
2. USE EXTREME CAUTION when working with high voltages.
3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds 500V above earth ground.
4. NEVER connect the meter leads across a voltage source while the function switch is in the current, resistance or diode mode; doing so can damage the meter.
5. ALWAYS discharge filter capacitors in power supplies and disconnect the power when making resistance or diode tests.
6. ALWAYS turn off the power and disconnect the test leads before opening the back to replace the fuse or batteries.
7. NEVER operate the meter unless the back cover and the battery/fuse door are in place and fastened securely.

AC Current Measurements

WARNING: To avoid electric shock, disconnect the test leads from the meter before making current measurements.

1) Set the Function switch to the 40 or 200A AC range.
2) Press the jaw trigger and clamp around, fully enclosing a single conductor. Do not allow a gap between the two halves of the jaw.
3) Read the ACA value on the LCD.

DC Current Measurements

WARNING: To avoid electric shock, disconnect the test leads from the meter before making current measurements.

1) Set the Function switch to the 40 or 200A DC range.
2) Press the DCA zero key to null the meter display.
3) Press the Trigger to open the current sense Jaw.
4) Fully enclose the conductor to be measured. Do not allow a gap between the two halves of the jaw.
5) Read the DCA value on the LCD.

AC Voltage Measurements

WARNING: To avoid electric shock or damage to the meter, do not make any voltage measurements that exceed the maximum specified.

1) Set the Function switch to the VAC position.
2) Insert the test leads to the meter as follows: Red lead to "V, Hz, Ω" terminal; Black lead to the COM input.
3) With the pointed end of the test leads measure voltage. Remember that voltage measurements are made in parallel with the device or circuit under test.
4) Read the ACV value on the LCD.

DC Voltage Measurements

WARNING: To avoid electric shock or damage to the meter, do not make any voltage measurements that exceed the maximum specified.

1) Set the Function switch to the VDC position.
2) Insert the test leads to the meter as follows: Red lead to "V, Hz, Ω" terminal; Black lead to the COM input.
3) With the pointed end of the test leads measure voltage. Remember that voltage measurements are made in parallel with the device or circuit under test.
4) Read the DCV value on the LCD.

Resistance and Continuity Measurements

WARNING: To avoid electric shock or damage to the meter, remove power to the circuit under test and discharge all capacitors.

1) Set the Function switch to the position.
2) Insert the test leads to the meter as follows: Red lead to "V, Hz, Ω" terminal; Black lead to the COM input.
3) With the pointed end of the test leads measure resistance. Remember that resistance measurements are made in parallel with the device or circuit under test.
4) Read the resistance value on the LCD.
5) If the resistance is less than 40 , the continuity beeper will sound.

Frequency Measurements

1) Ensure that at least 0.1A AC is detectable with an ACA measurement before measuring Frequency.
2) Set the Function switch to the Hz position.
3) Insert the test leads to the meter as follows: Red lead to "V, Hz, Ω" terminal; Black lead to the COM input.
4) With the pointed end of the test leads measure frequency
5) Read the Frequency measurement on the LCD in Hz.

Additional Features

Relative Measurements

1) Press the Zero key and the present measurement will Zero.
2) All subsequent measurements are displayed with respect to the zeroed reading. For example, if a 20A reading is zeroed and a 30A reading is subsequently measured, the LCD will display 10A.
3) To return to normal operation, press and hold the zero key for 2 seconds.
4) Note that Relative mode is not available if the MIN/MAX mode is enabled.

Data Hold

To freeze a reading on the LCD, press the Data Hold key. The HOLD icon will appear and the measurement will be held on the meter's LCD. To release the Data Hold function and return the meter to normal operation, press the Data Hold key again.

MIN/MAX Reading Mode

Pressing the MIN/MAX key allows the meter to display ONLY the highest and the lowest readings encountered. Press the MIN/MAX key once to view the minimum reading, press it again to view the maximum reading. Note that the meter will only change its displayed reading when a measurement higher than the previous MAX or lower than the previous MIN readings is encountered. The HOLD display icon (along with the MIN or MAX icon) will appear on the LCD in MIN/MAX mode. Pressing the MIN/MAX key a 3^rd time returns the meter to normal operation.

General Specifications

Display 3-3/4 (4000 count) Digit LCD with 40 segment bargraph
Functions ACA, DCA, ACV, DCV, Resistance, Frequency, Continuity
Polarity “-” indicates negative polarity
Current sensor Hall effect sensor type
Overload indication Left blinking digit
DCA zero adjust One touch zero key
Display rate 2 readings/second (20 readings/second for bargraph)
Battery Two 1.5V AA batteries
Operating temperature	4°F to 122°F (-10°C to 50°C)
Operating humidity < 85% RH
Power consumption	Approximately 10mA DC
Weight 8 oz. (225g) including battery
Dimensions 7 x 1.75 x 1.25" (178 x 45 x 32mm) (HWD)
Jaw opening 0.9" (23mm)
Standards IEC 1010	Category III 300V, Category II 600V

Range Specifications

Function	Range	Resolution. Accuracy			protect
DC Current	40A	10mA	±(1.0% +2dgts)		400A DC
	0 to 150A	100mA	±(1.0% +2dgts)		400A DC
	150 to 200A	100mA	±(2.2% +2dgts)		400A DC
AC Current			50/60Hz	40 to 400Hz
	40A	10mA	±(1.0% +3dgts)	±(1.5% +4dgts)	400A AC
	0 to 150A	100mA	±(1.0% +3dgts)	±(1.5% +4dgts)	400A AC
	150 to 200A	100mA	±(2.2% +3dgts)	±(2.5% ±4dgts)	400A AC
DC Voltage	400V	0.1V	±(1.0% +2dgts)		1000VDC
AC Voltage			50/60Hz	40 to 400Hz
	400V	0.1V	±(1.5% +2dgts)	±(2.0% +4dgts)	800V AC
Resistance	40 to 400Ω	0.1	±(1.0% +2dgts)	Beeper <38Ω	600V AC
Frequency	100 to 10k	0.01Hz	±0.5% ±2dgts	Sensitivity; 2V, 0.1A AC	600V AC

Overloa

Battery Replacement

1) When the low battery symbol appears on the LCD the batteries must be replaced.
2) Turn the meter off and remove the rear battery compartment screw.
3) Remove the battery compartment cover and replace the two 1.5V AA cells.
4) Replace the compartment cover and secure the screw.

You, as the end user, are legally bound (EU Battery ordinance) to return all used batteries, disposal in the household garbage is prohibited! You can hand over your used batteries / accumulators at collection points in your community or wherever batteries / accumulators are sold!

Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle

Cleaning

Caution: Use only a dry cloth to clean the plastic case.

Warranty

EXTECH INSTRUMENTS CORPORATION (a FLIR company) warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department for authorization. Visit our website www.extech.com for contact information. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied.

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also provides NIST certification for most products. Call the Customer Service Department for information on calibration services available for this product. Extech recommends that annual calibrations be performed to verify meter performance and accuracy.

Support lines: U.S. 877-439-8324, Intl. 603-324-7800

Technical support: Option 3; E-mail: [e-mail]

Repair & Returns: Option 4; E-mail: [e-mail]

Product specifications subject to change without notice

Visit our website: www.extech.com

Extech Instruments Corporation, 9 Townsend West, Nashua, NH 03063

ISO 9001 Certified since 1995