DMT4004 - Multimeter Monacor - Free user manual and instructions

USER MANUAL DMT4004 Monacor

7 Replacing the Fuses . . . . . . . . . . . . . 17 8 Specifications . . . . . . . . . . . . . . . . . . 18 All operating elements and connections de- scribed can be found on the fold-out page 3. 1 Operating Elements and Connections 1 Button RANGE for manual ranging 2 Button Hz% for switching over between fre- quency measurement and duty cycle meas- urement When the selector switch (10) is set to cur- rent or voltage measurement, the button Hz% allows to switch to frequency meas- urement and duty cycle measurement and also back to current or voltage measure- ment. 3 Button MODE for switching over the test function (e. g. direct or alternating current measurement, diode test, or continuity test) 4 Jack 10 A for the red test lead for current measurement 400 mA – 10 A 5 Jack µA/mA for the red test lead for current measurement up to 400 mA max. 6 Display 7 Button HOLD for freezing a measured value 8 Button REL for relative value measurement 9 Button for display illumination: To activate, keep the button pressed for 2 seconds; to deactivate, shortly actuate the button. 10 Selector switch for the test functions 11 Jack V Ω CAP Hz% for the red test lead, for all measurements except current meas- urements 12 Jack COM for the black test lead 13 Protective sleeve (2 pieces): For outdoor operation, insert these sleeves into the test jacks (4, 5, 11) that are not used to ensure protection of the unit in accordance with IP 67.

GB2 Safety Notes This unit corresponds to all relevant directives of the EU and is therefore marked with . Please observe the following items in any case:

When using the protective sleeves (13), the unit is protected in accordance with IP 67 and is also suitable for outdoor applications. However, protect it against extreme high or low temperatures (admissible ambient tem- perature range 0 – 50 °C).

For cleaning the housing only use a soft cloth, slightly wet, if necessary; never use chemicals or abrasive detergents.

No guarantee claims for the unit and no lia- bility for any resulting personal damage or material damage will be accepted if the rele - vant safety regulations for handling voltages equal to or higher than 42 V are not ob- served, if the unit is used for other purposes than originally intended, if it is not correctly connected or operated, if it is overloaded or not repaired in an expert way. 3 Applications This automatic digital multimeter with a 29 mm LC display (indication up to 4000) is suited for measuring: – voltages up to 1000 V /~ – currents up to 10 A /~ – frequencies up to 10 MHz – resistances up to 40 MΩ – capacitances up to 200 µF Furthermore, it allows to measure the duty cycle of electric signals and the forward volt- age of diodes. For continuity tests, a buzzer is provided. 4 Operation

1) To switch on the multimeter, set the selector

switch (10) from the position OFF to the de- sired function. If there is no indication on the display (6), insert a battery (

side to obtain a more convenient reading position of the display.

3) After operation, set the selector switch to

the position OFF. The unit will be switched off automatically if it is not used for 15 minutes. One minute before it is switched off automatically, there will be 5 short acoustic signals; when it is switched off, a longer acoustic signal will sound. To switch it on again, actuate a but- ton or the selector switch.

4.1 Inserting or replacing the battery

If there is no indication on the display (6) after switching on or if the symbol on the left of the display shows a discharged battery, insert a 9 V battery or replace the battery.

1) Unfold the tilt stand on the rear side and re-

move the two central screws for the battery compartment cover.

2) Remove the cover and insert a 9 V battery

as indicated in the compartment.

3) Close the battery compartment.

If the meter is not used for a longer period, re- move the battery to prevent damage due to battery leakage. If the unit is to be put out of operation definitively, take it to a local recycling plant for a disposal which is not harm- ful to the environment. Dead batteries or defective rechargeable bat- teries do not belong in the household rubbish, always take them to a special waste disposal (e. g. collection container at your retailer). WARNING With this meter, dangerous volt- ages can be measured. Particu- lar attention should be paid when measuring voltages equal to or higher than 42 V!

1. Wear protective gloves to protect you

against electric shock.

2. When applying the probe tips, make sure

that your fingers are protected behind the collar of the probe.

3. Never perform measurements when the

meter or the test leads are damaged. Al- ways replace damaged test leads by origi- nal test leads.

GB4.2 Attaching the ATTENTION! label Labels with important infor- mation in eight languages are supplied with the meter. At- tach the corresponding label in your language to the field provided on the cover of the battery compartment!

4.3 Connecting the test leads

The meter is equipped with four test jacks:

1. The jack COM (12) is the common (

) jack for all measurements. Connect the black test lead to this jack.

2. The jack V Ω CAP Hz% (11) is the com-

mon (+) jack for all measurements, except for current measurements. Connect the red test lead to this jack.

3. For current measurements up to 400 mA,

disconnect the red test lead and connect it to the jack µA/mA (5).

4. For current measurements between 400 mA

and 10 A, disconnect the red test lead and connect it to the jack 10A (4). IMPORTANT! For outdoor operation of the multimeter, insert the protective sleeves sup- plied (13) into the two test jacks that are not used. Only this will ensure protection of the unit in accordance with IP 67. 5 Measurements Prior to switching over to another test function, remove the probe tips from the object to be measured, otherwise the multimeter may be damaged!

5.1 Voltage measurement

1) Set the selector switch (10) to the position V.

After switching on, the DC voltage measure- ment will always be activated: The display (6) will indicate “DC” at the top on the left. For AC voltage measurements, switch over to the indication “AC” with the button MODE (3). The button MODE also allows to return to the DC voltage measurement.

2) The red test lead must be connected to the

jack V Ω CAP Hz% (11). Caution! The test lead must not be con- nected to the jack 10A (4) or µA/mA (5), otherwise the meter and the object to be measured may be damaged.

3) Apply the probe tips to the object to be meas-

ured and read the value on the display. If, for DC voltage measurements, the red probe tip is applied to the negative pole and the black tip to the positive pole, a minus sign will precede the measured value.

4) During an AC voltage measurement, the

button Hz% (2) allows to switch over to fre- quency measurement and duty cycle meas- urement, however, the input sensitivity will not be as high and the frequency range will not be as large as that for a measurement in the position Hz% of the selector switch: To return to AC voltage measurement, press the button Hz% once or twice so that the dis- play will indicate “AC” and “V” again. Measuring range Sensitivity Frequency range 4V~ ≥ 1.5 V~ 5 Hz – 10 kHz 40 V~, 400 V~ ≥ 10 V~ 5 Hz – 20 kHz ≥ 20 V~ 5 Hz – 200 kHz 1000 V~ ≥ 420 V~ 50 Hz – 1 kHz WARNING Take into account unexpected voltages on objects to be meas- ured. Capacitors, for example, may be dangerously charged even if the voltage source has been switched off.

Never perform measurements in electric circuits with corona discharges (high volt- age) with this meter. Risk of electrocution!

The maximum voltage to be measured must not exceed 1000 V¿ /~, otherwise you will risk your life! WARNING Measurements in circuits carry- ing more than 42 V must only be made by persons able to recog- nize a hazard of contact and to take the required safety precau- tions. In case of measurements with a hazard of contact, avoid working on your own. Ask a sec- ond person to assist. Power supply: 1 x 9 V battery F 10 AH / 1000 V F 500 mAH / 1000 V ATTENTION! To prevent the danger of an electric shock, the probe tips must be removed from the connecting jacks and the measuring spots prior to opening the housing. Fuses are inserted to pro- tect against overvoltage and fire hazard. Faulty fuses must only be replaced by fuses of the same type!

GB5.2 Current measurement

The current to be measured must not ex- ceed 10 A!

Currents between 1 A and 10 A must not be measured for more than 30 seconds, other- wise the meter and the test leads may be damaged.

1) For measurements up to 400 mA, connect

the red test lead to the jack µA/mA (5); for measurements between 400 mA and 10 A, connect it to the jack 10A (4). In case of un- known currents, start the measurement with the 10 A range as a precaution. Caution! Never make a voltage measure- ment when the test lead is connected to the jack µA/mA or 10A, otherwise the meter and the voltage source may be damaged.

2) According to the current to be measured,

set the selector switch (10) to the following position:

3) After switching on, the direct current meas-

urement will always be activated: The dis- play (6) will indicate “DC” at the top on the left. For alternating current measurements, switch over to the indication “AC” with the button MODE (3). The button MODE also al- lows to return to the direct current measure- ment.

4) Insert the meter via the test leads into the

circuit to be measured and read the meas- ured value on the display. If, for direct current measurements, the red probe tip is applied to the negative pole and the black tip to the positive pole, a minus sign will precede the measured value. If the current measured exceeds the admissible value of the measuring range, warn ing signals will sound and “OL.” (over- load) will appear on the display. In this case, select the next higher range.

5) During an alternating current measurement,

the button Hz% (2) allows to switch over to frequency measurement and duty cycle measurement, however, the input sensitivity will not be as high and the frequency range will not be as large as that for a measure- ment in the position Hz% of the selector switch. To return to alternating current measure- ment, press the button Hz% once or twice so that the display will indicate “AC” and “A”, “mA”, or µA” again.

5.3 Resistance measurement

Never measure a resistor when voltage is applied, and always measure it separately, otherwise the measurement will be inaccu- rate. For this purpose, it may be necessary to solder it out of the circuit. Set the selector switch (10) to the position Ω and apply the probe tips to the resistor. Read the resistance value on the display. As long as there is no resistor between the probe tips or the probe tips are not shorted, the display will show “OL.” to indicate an infinitely high value.

5.4 Continuity buzzer

The continuity buzzer is used for checking if current flows without interruption.

Never perform a continuity test when volt- age is applied, otherwise the meter may be damaged and the measurement will be in- accurate.

1) Set the selector switch (10) to the position

. At the top of the display the symbol for diode test will appear.

2) Switch over to continuity test with the button

MODE (3). At the top of the display the buzzer symbol will appear.

3) Apply the probe tips to the corresponding

measuring points. If the resistance between the points is less than 40 Ω, the continuity buzzer will sound. The resistance value will be indicated on the display up to 400 Ω; in case of higher values, the overload indica- tion “OL.” will appear. Measuring range Sensitivity Frequency range 400 mA~ ≥ 45 mA 5Hz– 5kHz 10 A~ ≥ 4 A 5Hz– 1kHz Current measured Position < 4000 µA µA 4 – 400 mA mA 400 mA – 10 A 10A

Never measure a diode when voltage is ap- plied, and always measure it separately, otherwise the measurement will be inaccu- rate. For this purpose, it may be necessary to solder the diode out of the circuit. Set the selector switch (10) to the position . At the top of the display the symbol for diode test will appear. When the probe tips are ap- plied to the diode in forward direction, the for- ward voltage up to 0.999 V will be indicated. The positive pole of the measuring current (ap- prox. 0.3 mA) is applied to the red probe tip. With an indication of approx. 0 V, the diode has a short circuit. If “OL.” is indicated, the diode has a higher forward voltage than 1 V (e. g. LEDs), the diode is interrupted, con- nected in reverse direction (reverse the polarity of the diode), or has no contact to the probe tips.

5.6 Capacitance measurement

The DMT-4004 allows to measure capacitors with a capacitance up to 200 µF. Set the selector switch (10) to the position CAP and apply the probe tips to the capacitor. The measuring process may require a few seconds so that it will take a while until the correct value is indicated. If the capacitance is higher than 200 µF, “OL.” will appear to indicate that the measuring range has been exceeded.

5.7 Frequency measurement

This meter allows to measure frequencies up to 10 MHz. The sensitivity is: Set the selector switch (10) to the position Hz%. Apply the probe tips to the measuring points and read the frequency on the display. In the AC voltage range and in the alternat - ing current ranges, a frequency measurement is also possible (

5.8 Duty cycle measurement

The meter allows to measure the duty cycle in %. The duty cycle is the ratio of the positive signal part to the period, e. g.: Measuring range: . . 0.1 % to 99.9 % Sensitivity: . . . . . . . < 0.5V~ Frequency range: . 5Hz – 150 kHz The positive signal part must be 100 µs– 100 ms.

1) Set the selector switch to the position Hz%.

The frequency measurement is activated.

2) Use the button Hz% (2) to switch over to

duty cycle measurement. On the right of the display, the indication will change from “Hz” to “%”.

3) Apply the probe tips to the measuring points

and read the duty cycle on the display.

4) To return to frequency measurement, press

the button Hz% once again. In the AC voltage range and in the alternating current ranges, a duty cycle measurement is also possible (

chapters 5.1 and 5.2). Frequency Sensitivity ≤ 1 MHz < 0.5 V~ > 1 MHz > 3 V~ WARNING Never measure a capacitor when it is charged or when the operating voltage is applied, oth- erwise you will risk an electric shock. Furthermore, the meas- urement will be inaccurate. Switch off the power supply and discharge the capacitor before soldering it out of the cir- cuit.

GB6 Additional Functions

When “AUTO” appears at the top on the left of the display, the optimum measuring range for a test function will always be selected automati - cally.

1) To hold a range selected automatically,

press the button RANGE (1). The indication “AUTO” will disappear.

2) Each time the button RANGE is pressed,

the next higher range will be selected. Thus, the resolution of the measured value will de- crease, however, this will prevent a continu- ous switch-over in case the measured value varies between two ranges. When the highest possible measuring range is reached, the smallest range will be selected when the button is pressed again. If the range is too small, “OL.” (overload) will be indicated.

3) To return to autoranging, keep the button

RANGE pressed for approx. 2 seconds until “AUTO” reappears on the display or select another test function with the selector switch (10).

It is possible to freeze a measured value indi- cated on the display. This will allow you, for example, to still read the value even if the probe tips have already been removed from the object to be measured. For this purpose, press the button HOLD (7). At the top of the display “HOLD” will appear. To return to the current measured value, de- activate the function with the button HOLD (“HOLD” will disappear). The function will also be deactivated when another test function is selected with the selector switch (10).

6.3 Relative value measurement

The relative value measurement allows to indi- cate deviations from a defined measured value. The function can be activated when measuring current, voltage, resistance, and capacitance.

1) Perform a measurement. When the desired

reference value is indicated, press the but- ton REL (8). At the top of the display, the in- dication “REL” will appear. It will not be possible to activate the function when the display indicates “OL.”.

2) When the measured value changes, the de-

viation from the reference value will be indi- cated. For relative value measurement, auto - ranging will be deactivated. Once the meas- uring range has been exceeded, the display will indicate “OL.”.

3) To deactivate the relative value measure-

ment, actuate the button REL once again. If required, activate autoranging again with the button RANGE (keep the button RANGE pressed for approx. 2 seconds). The relative value measurement will also be deactivated when another test function is selected. 7 Replacing the Fuses If it is not possible to measure currents, check the internal fuses and have them replaced by skilled personnel.

1) Unscrew the six screws for the housing shell

(two screws are located underneath the tilt stand) and remove the housing shell.

2) Always replace defective fuses by fuses of

the same type only: µA and mA range: F500 mAH/1000 V 10 A range: F10 AH/1000 V

3) Screw down the housing shell again before

setting the meter into operation. WARNING Prior to opening the housing, re- move the probe tips from the measuring points and from the connection jacks, otherwise you will risk an electric shock.

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