Mastech MS8250A Operation Manual page 9

MS8250A/B Digital Multimeter
Operating guidance
4.10 AC voltage/DC voltage measurement
Voltage is the potential difference between two points. AC voltage polarity
changes over time, while DC voltage polarity does not change over time.
DC voltage measuring range of this meter: 400.0mV, 4.000V, 40.00V,
400.0V, 600V; AC voltage measuring range of this meter: 400.0mV, 4.000V,
40.00V, 400.0V, 600V. The 400mV measuring range can be entered only in
the manual measuring range mode.
To measure AC and DC voltage:
4.10.1 Rotate switch to voltage position.
4.10.2 Respectively connect black and red test probes to COM input socket
and V input socket.
4.10.3 Measure the voltage of circuit to be tested with other two ends of test
probes. (Connected with the circuit to be tested in parallel)
4.10.4 Read the measuring voltage value from LCD display. When
measuring DC voltage, the display will simultaneously show the voltage
polarity which is connected with red test probe.
4.10.5 Press FUNC key to switch AC voltage, DC voltage measurement.
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MS8250A/B Digital Multimeter
Operating guidance
4.11  Measurement
Resistance range of this meter: 400.0, 4.000k, 40.00k, 400k, 4.000M,
10.00M.
To measure resistance:
4.11.1 Rotate rotary switch to
4.11.2 Respectively connect black and red test probes to COM input socket
and V input socket.
4.11.3 Measure the resistance value of circuit to be tested with other two ends
of test probes.
4.11.4 Read the measuring resistance value from LCD display.
4.12 Measurement
When measuring resistance, press FUNC key to switch continuity test.
4.12.1 Respectively connect black and red test probes to COM input socket
and  input socket.
4.12.2. Measure the resistance value of circuit to be tested with other two
ends of test probes
4.12.3. During continuity test, if the measured circuit resistance is not
greater than about 50, the buzzer may issue continuous sound.
4.13 Measurement
When measuring continuity, press FUNC key to switch to diode test.
4.13.1 Respectively connect black and red test probes to COM input socket
and  input socket.
4.13.2. Measure two ends of diode to be measured with other two ends of
test probes
4.13.3. The meter will display the forward voltage drop value of the diode.
position.
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