Current Measurement - Mastech MS8250A Operation Manual

MS8250A/B Digital Multimeter
Operating guidance
4.14 Capacitance measurement
Capacitance range of this meter: 40.00nF, 400.0nF, 4.000

100.0 F
To measure capacitance:
4.14.1 Rotate rotary switch to
4.14.2 Respectively connect black and red test probe to COM input socket
and input socket.
4.14.3 Measure the capacitance value of circuit to be tested with other two
ends of test probes and read the measuring value from LCD display.
4.15 Frequency and duty ratio measurement
Capacitance range of this meter: 5Hz, 50Hz, 500Hz, 5kHz, 50kHz, 5MHz
To measure capacitance:
4.15.1 Rotate the switch to Hz position.
4.15.2 Respectively connect black and red test probe to COM input socket
and Hz input socket.
4.15.3 Measure the frequency to be measured with other two ends of test
probes and read the measuring value from LCD display.

4.16 Current measurement


Current range of this meter: 400
10.000A;
4.16.1 Cut off the power supply of circuit to be tested. Discharge all high
voltage capacitors on the circuit to be tested.
4.16.2 Rotate switch to the appropriate position (uA, mA or A grade).
4.16.3 Connect the black test probe to the COM input socket. If the current
to be tested is lower than 600mA, connect the red test probe to the mA input
socket; if the measured current is between the range of 600mA~10A, the
red test probe should be connected to 20A input socket.
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 
F, 40.00 F,
position.

A, 4000 A, 40.00mA, 400.0mA,
MS8250A/B Digital Multimeter
Operating guidance
4.16.4 Cut off the circuit to be tested. Connect the black test probe to one
end of disconnected circuit (low voltage relatively), and connect the red test
probe to the other end of disconnected circuit (high voltage relatively).
4.16.5. Connect the power supply of circuit to be tested, then read the display
reading. If the display shows only "OL", the input is out of the selected input
range, so please rotate the switch to a higher measuring range.
4.17 Communicate with computer (only for MS8250B)
One end of USB cable is connected to one end of the meter, the other end is
connected to computer USB interface, at this time, the meter will display
PCLINK, open the special software of this machine to read and save the meter
measuring data.
5. Maintenance
5.1 Replace battery
Warning
Before opening the meter battery cover, remove probe from the
circuit to be measured to avoid electric shock.
5.1.1 When the battery indicator "
replaced immediately.
5.1.2 Unscrew the fastening screw of the meter battery cover and remove it .
5.1.3 Replace battery.
5.1.4 Install the battery cover.
Note:
The battery polarity can't be reversed.
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" appears, the battery should be