EKF MASTER M830B - Direct Current Measurement; Resistance Measurement

6
4 MEASUREMENTS
DC AND AC VOLTAGE MEASUREMENT
1. Connect the red probe to the socket «VΩ», and the black probe to the socket «COM».
The polarity of the red probe is considered positive.
2. Use the rotary switch to select the desired DCV or ACV voltage measurement range.
If you do not know the measured voltage before measuring, set the range switch
to the maximum voltage position and switch to lower values to achieve the required
measurement accuracy.
3. Connect the probes to the tested circuit.
4. Read the value and polarity of the tested voltage on the display.
5. If the display shows only «1» in the left digit, overload has occurred. Set the range
switch to a higher value.
6. When the work is nished, put the rotary switch to the «OFF» position.
When the range switch is set to «750 V» the display will show a «HV» sign
to warn of high voltage operation. Caution is required.
DIRECT CURRENT MEASUREMENT
1. Connect the red probe to the socket « VΩmA », and the black probe to the socket
«СОМ». The polarity of the red probe is considered positive.
2. Use the rotary switch to select the desired direct current DCA measurement range.
If you do not know the measured current before measuring, set the range switch
to «200 mA» and then switch to the lower values to achieve the desired measurement
accuracy. If you assume that the measured current is in the range from 200 mA to 10 A,
move the red probe to the socket «10 A».
3. Open the tested circuit and connect the probes of the device in series with the load
where the current is measured.
4. Read the current value and its polarity on the display.
5. If the display shows only «1» in the left digit, overload has occurred. Set the range
switch to a higher value.
6. When the work is completed, put the rotary switch to the «OFF» position.
Range 10 A is not protected against overload.
Maximum measurement time is 15 s.
RESISTANCE MEASUREMENT
1. Connect the red probe to the socket «VΩmA», and the black probe to the socket
«СОМ». The polarity of the red probe is considered positive.
2. Use the rotary switch to select the desired resistance measurement range Ω.
3. Connect the probes to the tested resistance and read the values on the display.
4. If the value of the measured resistance exceeds the maximum value of the selected
measurement range, the display will show «1» in the left digit.
5. When the work is nished, put the rotary switch to the «OFF» position.
If the measured resistance is set in the circuit, disconnect the power and
discharge all capacitances of the circuit before performing measurements.
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