DMM240 - Multimeter MULTIMETRIX - Free user manual and instructions

USER MANUAL DMM240 MULTIMETRIX

User's manual Chapter II - page 18

1.1 Precautions and safety measures ....................................... 19

3.2 AC voltage measurements (frequency, duty cycle) ............. 24

3.3 DC current measurements .................................................. 24

3.4 AC current measurements (frequency, duty cycle) .............. 25

1.1 Precautions and safety measures

You have just acquired a DMM240 RMS multimeter. Thank you for your confidence. It measures AC/DC Voltage, AC/DC Current, Resistance, Frequency (electrical & electronic), and test diodes and Continuity. It features a waterproof, rugged design for heavy duty use. Proper use and care of this multimeter will provide many years of reliable service. This multimeter complies with the IEC 61010-1 and IEC 61010-2-033 standards concerning electronic measurement instruments. For your own safety and to prevent damage to the instrument, follow the instructions in this manual. Be careful to adhere to storage conditions. This handheld autonomous instrument was designed for: ∗ Indoor use ∗ Use in pollution 2 degree environments ∗ In altitudes lower than 2,000 meters ∗ In temperatures ranging from 5°C to 40°C It can be used up to 1000 V on category III circuits, or 600 V on category IV circuits. MEASUREMENT CATEGORIES (IEC 61010-2-033) CAT II: MEASUREMENT CATEGORY II is applicable to test and measuring circuits connected directly to utilization points (socket outlets and similar points) of the low-voltage MAINS installation. This part of the installation is expected to have a minimum of two levels of overcurrent protective devices between the transformer and the connecting points of the measuring circuit. Example : measurements on MAINS CIRCUITS of household appliances, portable tools and similar equipment. CAT III: MEASUREMENT CATEGORY III is applicable to test and measuring circuits connected to the distribution part of the building’s low-voltage MAINS installation. This part of the installation is expected to have a minimum of one level of over-current protective devices between the transformer and possible connecting points. Example : measurements on distribution boards (including secondary electricity meters), circuitbreakers, wiring, including cables, bus-bars, junction boxes, switches, socket -outlets in the fixed installation, and equipment for industrial use and some other equipment such as stationary motors with permanent connection to the fixed installation. CAT IV: MEASUREMENT CATEGORY IV is applicable to test and measuring circuits connected at the source of the building’s low-voltage MAINS installation. This part of the installation could have no over- current protective devices between the transformer and connecting points of the measuring circuit.Chapter II 20 DMM240 Example : measurements on devices installed before the main fuse or circuit breaker in the building installation.

1.1.2 When using the instrument

- Never exceed the protection limiting values indicated in the specifications for each type of measurement. - When the multimeter is connected to the circuits to be measured, do not touch any unused terminals. - Before changing function, disconnect the measurement leads from the circuit measured. - Never measure resistances or test diodes, etc., on a live circuit.

According to WEEE directive 2002/96/EC Refer to the user's manual Risk of electric shock Double insulation

Before opening the instrument, disconnect it from the circuits to be measured and make sure that you are not charged with static electricity, which could irreparably damage the instrument's internal elements.Chapter II DMM240

Disconnect external circuit leads and turn off the instrument. Clean with a damp cloth and soap. Never use abrasive products or solvents. Make sure the instrument is perfectly dry before using it again.

1.1.6 Protection factor (PF)/Humid environment

This instrument has a PF67 protection factor, which means that it is extremely waterproof and will not be damaged by water immersion (when turned off). However, the instrument and its accessories must be completely dry (including inside measurement terminals) before being used again.

This equipment is guaranteed against any material or manufacturing flaws, as specified in the general terms of sale. During the guarantee period (1 year), the instrument can only be repaired by the manufacturer, who reserves the right to repair the instrument or to exchange all or part of it. If the equipment is returned to the manufacturer, the outgoing transport costs are borne by the customer. The guarantee is not applicable in the following cases:

1. improper use of the equipment or use in conjunction with

incompatible equipment;

2. modifications to the equipment without the explicit authorisation of

the manufacturer's technical department;

3. work carried out on the instrument by a person not approved by the

4. adaptation for a specific application, not included in user's manual

5. knocks, falls or prolonged immersion.

Return your instrument to your distributor for any work to be done within or outside of the guarantee.

1.4 Unpacking - Repacking

The equipment underwent thorough mechanical and electronic testing before shipment. All the necessary precautions were taken to ensure that you receive the instrument in good condition. We recommend you check the equipment quickly on delivery to detect any damage that may have occurred during transport. If there is any damage, inform the carrier immediately. If you ship this instrument on elsewhere, it is preferable to use the original packaging and indicate the reasons for reshipment as clearly as possible in a note enclosed with the equipment.Chapter II 22 DMM240

2.1 Controls and Terminals

Tilt stand and battery compartment are on rear of unit.

2.2 Symbols and Abbreviations

Capacity expressed in nanofarads (10

Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and should be measured with great care.

1. Always turn the function switch to the OFF position when the

multimeter is not in use.

2. If “OL” appears on screen during a measurement, the value

exceeds the range you have selected. Choose a higher range.

3.1 DC voltage measurements

Do not measure DC voltages if a motor on the circuit is being switched ON or OFF. Voltage surges may occur and damage the multimeter.

1. Set the function switch to the VDC position.

2. Insert the black test lead banana plug into the

negative COM terminal. Insert the red test lead banana plug into the positive + terminal.

3. Apply the test probes to the points of the circuit

4. The voltage measured is displayed on screen.Chapter II

3.2 AC voltage measurements (frequency, duty cycle)

measurements Risk of Electrocution. The test probes may not be long enough to reach the live parts in certain sockets contacts are too deeply recessed. As a result, the reading may show 0 volts when the wall socket is live. Make sure the test probes are touching the live parts before assuming that no voltage is present. Do not measure AC voltages if a motor on the circuit is being switched ON or OFF. Voltage surges may occur that can damage the multimeter.

1. Set the function switch to the VAC/Hz% position.

2. Insert the black test lead banana plug into the

negative COM terminal. Insert red test lead banana plug into the positive + terminal.

3. Apply test probes to the points of the circuit to

4. Voltage measured is displayed on screen.

5. Press the Hz% key to indicate “Hz”.

6. Read the frequency in the display.

7. Press the MODE key again to display “%”.

8. Duty cycle is displayed in percentage.

3.3 DC current measurements

Do not make 20 A current measurements for longer than 30 s. Exceeding 30 seconds may cause damage to the multimeter and/or the test leads.

1. Insert the black test lead banana plug into the

set the function switch to the µA position and insert the red test lead banana plug into the µA/mA terminal.

3. For current measurements up to 600mA DC,

set the function switch to the mA position and insert the red test lead banana plug into the µA/mA terminal.

4. For current measurements up to 20A DC, set

the function switch to the 10A position and insert the red test lead banana plug into the 10A terminal.Chapter II DMM240

5. Press the MODE key to display “DC” on screen.

6. Remove power from the circuit to be tested, then open the circuit

at the point where you wish to measure the current.

7. Apply the test probes to the points of the circuit to be tested.

8. Apply power to the circuit.

9. Current measured is displayed on screen.

3.4 AC current measurements (frequency, duty cycle)

Do not make 20 A current measurements for longer than 30 s. Exceeding 30 seconds may cause damage to the multimeter and/or the test leads.

1. Insert the black test lead banana plug into the

negative COM terminal.

2. For current measurements up to 6000µA AC, set

the function switch to the µA position and insert the red test lead banana plug into the µA/mA terminal.

3. For current measurements up to 600mA AC, set

the function switch to the mA position and insert the red test lead banana plug into the µA/mA terminal.

4. For current measurements up to 20A AC, set the

function switch to the 10A position and insert the red test lead banana plug into the 10A terminal.

5. Press the MODE key to display “AC” on screen.

6. Remove power from the circuit to be tested, then open the circuit

at the point where you wish to measure the current.

7. Apply test probes to the points of the circuit to be tested.

8. Apply power to the circuit.

9. Read the current in the display.

10. Press the Hz% key to display “Hz”.

11. Frequency measured is displayed on screen.

12. Press the Hz% key again to indicate “%”.

13. Duty cycle is displayed in percentage.

14. Press the Hz% key to return to current measurement.

3.5 Resistance measurements

To avoid any risk of deterioration, remove power from the circuit to be tested before making resistance measurements.Chapter II 26 DMM240

1. Set the function switch to the Ω position.

2. Insert the black test lead banana plug into the

negative COM terminal.

3. Insert the red test lead banana plug into the

positive + terminal.

4. Press the MODE key to indicate "

5. Touch the test probes to the points of the

circuit to be tested. It is best to disconnect one side of the part to be tested so the rest of the circuit will not interfere with the measurement. The value measured is displayed.

To avoid any risk of deterioration, remove power from the circuit to be tested before making any continuity measurements.

1. Set the switch to the Ω position.

2. Insert the black lead banana plug into the

negative COM terminal. Insert the red test lead banana plug into the positive + terminal.

3. Press the MODE key to display " " and

4. Apply test probes to the points of the circuit

5. All resistance higher than 100Ω will stop the

instrument’s sound alert. If the circuit is open, “OL” is displayed on screen.

To avoid any risk of deterioration, remove power from the circuit to be tested before making any diode measurements.

1. Set the function switch to the Ω position.

2. Insert the black test lead banana plug into the

negative COM terminal and the red test lead banana plug into the positive + terminal.

3. Press the MODE key to display and V on

4. Apply test probes to the terminals of the diode to be tested. Direct

voltage is usually expressed by a value between 0.4 and 0.7 V. Reverse voltage is indicated by “OL”. Short-circuit elements display a value close to 0V, open elements “OL” in both polarities.

3.8 Temperature measurements

2. Insert connector banana plugs into the

negative COM and positive Temp terminals in keeping with polarity.

3. Press the MODE key to indicate ºF or ºC

4. Touch the Temperature Probe head to the

part whose temperature you wish to measure.

5. The temperature measured is displayed.

The temperature probe is fitted with a type K mini connector. A mini connector to banana plug adaptor is supplied for connection to the terminals.

3.9 Capacity measurements

To avoid any risk of deterioration, remove power from the circuit to be tested and unload capacitors before making capacity measurements.

2. Insert the black test lead banana plug into the

negative COM terminal. Insert the red test lead banana plug into the positive + terminal.

3. Press the MODE key to display “nF” on screen.

4. Apply the test probes to the points of the circuit to

5. The measurement may take up to 3 minutes or

more for large capacitors, due to load time. Wait until the displayed measurement settles before ending the test.

6. The capacity value is displayed on screen.Chapter II

3.10 Duty cycle/frequency measurements (Electronic)

2. Press the Hz/% key to display “Hz” on

3. Insert the black lead banana plug into the

negative COM terminal and the red test lead banana plug into the positive + terminal.

4. Apply the test probes to the points of the

circuit to be tested.

6. Frequency measured is displayed on

7. Duty cycle is displayed in percentage.

3.11 % 4 – 20mA measurements

1. Set up and connect as described for DC mA measurements.

2. Set the function switch to the 4-20mA% position.

3. The multimeter will display loop current as a % with 0mA=-25%,

4mA=0%, 20mA=100%, and 24mA=125%.

3.12 Autoranging/Manual range selection

When the multimeter is first turned on, it automatically goes into Autoranging and this automatically selects the best range for the measurements being made. This is generally the best mode for most measurements. For measurement situations requiring manual selection, proceed as follows:

1. Press the RANGE key. The “AUTO” display indicator will turn off.

2. Press the RANGE key several times to scroll through the available

ranges until the one you want is displayed.

3. To exit the Manual selection mode and return to Autoranging, press

and hold down the RANGE key for 2 seconds. Manual ranging does not apply to temperature measurements.Chapter II DMM240

When using the MAX/MIN function in autoranging mode, the multimeter will “lock” into the range that is displayed on the LCD when MAX/MIN is activated. If a MAX/MIN reading exceeds that range, “OL” will be displayed. Select the adequate range before entering MAX/MIN mode.

1. Press the MAX/MIN key to activate the MAX/MIN measurement mode.

The "MAX" icon will appear. The multimeter will display and hold the maximum measurement until another maximum value is reached.

2. Press the MAX/MIN key again to display the "MIN" icon. The

multimeter will display and hold the minimum measurement until another minimum value is reached.

Relative mode enables relative measurement results to be obtained in relation to a stored reference value. The displayed value is the difference between the stored reference value and the value measured. Relative mode does not apply to the 4-20mA function.

1. Perform the measurement as described in the operating instructions.

2. Press the REL key to store displayed measurement. The "REL"

indicator is displayed.

3. The display will now indicate the difference between the stored

reference value and the value measured.

4. Press the REL key to exit relative mode.

Press the HOLD/ key down for >1 second to activate or disable backlighting. Backlighting will automatically disable after 10 s.

The hold function freezes the reading in the display. Press the HOLD key briefly to activate or to disable the HOLD function.

The Peak Hold function captures the peak AC or DC voltage or current. The multimeter can capture negative or positive peaks as fast as 1 ms in duration. Briefly press the PEAK key, “PEAK” and “MAX” will display. The multimeter will update the dispay each time a higher positive peak occurs. Press the PEAK key again, “MIN” will display. The multimeter will update the dispay each time a lower negative peak occurs. Press and hold the PEAK key for more than 1 s to exit PEAK Hold mode. Auto Power Off feature will be disabled automatically in this mode.Chapter II 30 DMM240

3.18 Low battery indication

When a fresh battery is installed, the battery icon with four lines above it will be displayed in the lower right corner of the LCD. The lines will disappear as the battery is used. When the icon appears alone in the display, the battery must be replaced.

The auto off feature will turn the multimeter off after 15 minutes. To disable the auto power off feature, hold down the MODE key when turning the multimeter on. “APO d” will appear in the display. Turn the multimeter off and then on again to re-enable the auto power off feature.

To avoid electric shocks, disconnect the measurement leads from any source of voltage before opening the instrument or battery compartment. Do not use the instrument when it is open or without locking the battery compartment cover. This multimeter is designed to provide years of reliable service, if the following care instructions are followed:

1. Keep the multimeter dry. If it gets wet, wipe it dry.

2. Use and store the multimeter in normal temperatures. Extreme

temperatures can shorten the life of the electronic parts and distort or melt plastic parts.

3. Handle the multimeter gently and carefully. Dropping it can

damage the electronic parts or the case.

4. Keep the multimeter clean. Wipe the case occasionally with a

damp cloth. DO NOT use chemical substances, cleaning solvents, or detergents.

5. Use only new batteries of the recommended size and type.

Remove the old or used battery so it does not leak and damage the instrument.

6. If the multimeter is to be stored for a long period of time, the

battery should be removed to prevent damage to the unit.Chapter II DMM240

4.1 Battery installation

To avoid electric shocks, disconnect the leads from any source of voltage before removing the battery cover.

1. Turn power off and disconnect the test leads from the meter.

2. Open the battery cover on the rear panel by removing the two

screws (B) using a Phillips head screwdriver.

3. Insert the battery into battery holder, observing the correct polarity.

4. Put the battery cover back in place. Screw back down.

If your multimeter is not working properly, check the fuses and batteries to make sure that they are still good and that they are properly inserted.

4.2 Replacing the fuses

To avoid electric shocks, disconnect the test leads from any source of voltage before removing the battery cover.

1. Disconnect the test leads from the multimeter.

2. Remove the battery cover (two “B” screws) and the battery.

3. Remove the six “A” screws securing the rear cover.

4. Gently remove the old fuse and install the new one.

5. Always use a fuse of the proper size and value (0.5A/1000V fast

Accuracy is valid from 18

Function Range Resolution Accuacy Authorized overload protection Resistance 400 Ω

Frequency (electrionic) 40 Hz

1000 V Pulse width : 100 µs - 100 ms Frequency : from 5 Hz to 150 kHz Temp. (K type) (*probe accuracy not included) -50°C to 1000°C 0.1°C ±(1.0%R+2.5°C)*

Accuracy features consist in two elements: (% reading R): is the accuracy of the measurement circuit (+ digits D): is the accuracy of the analogue to digital converterChapter II 34 DMM240 Case Double molded, waterproof PF67 Shock resistance 2 m (Drop Test) Diode Test Test current of 0.9mA maximum, open circuit voltage 2.8V DC typical Continuity Test Sound alert will stop if the resistance is > 100Ω, test current < 0.35 mA Input Impedance 10MΩ = and V ≈ AC Response True rms value ACV Bandwidth From 45Hz to 1kHz Peak Factor ≤ 3 at full scale up to 500V, decreasing linearly to ≤1.5 at 1000V Display 40,000 count backlit liquid crystal with bargraph Overrange indication “OL” is displayed Auto Power Off 15 min (approx.) with disable feature Polarity Automatic : no indication for positive values Minus (-) sign : negative values Measurement Rate 2 times per second, nominal Low Battery Indication “ ” is displayed if battery voltage drops below operating voltage Battery 1 x 9 V battery (6LF22) Fuses mA, µA ranges; 0.5A/1000V fast ceramic A range; 10A/1000V fast ceramic Operating Temperature 5ºC to 40ºC Storage Temperature -20

Operating Humidity linear up to 40°C