Mastech MS8251B, Operation Manual

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Note
：
1.Even though there is no indication,voltage may still
exist.Do not rely solely on NCV detector to determine
the presence of voltage in a wire.The measurement
may be affected by the design of the outlet,type of
insulation and other
external factors
.
2.The voltage sensing indicator may turn on when a
voltage is fed to the meter.
3.Other external interference(ex.Flashlight,motor)may
trigger the NCV sensor.
4.9 AC/DC Voltage
Voltage is the electrical potential difference between two
points in a circuit. AC polarity changes over time, where
DC polarity stays constant.
Measuring AC or DC voltage:
4.9.1 Move the rotary switch to the “
V ” position.
4.9.2 Connect the red test lead to the “ V ” jack and the
black test lead to the “ COM ” jack.
4.9.3 Connect the test leads to the voltage source or load.
4.9.4 The measured voltage will be displayed.For DC
voltage, polarity of the red test lead will be
indicated.
4.9.5
Press “ FUNC ” to switch between AC/DC voltage.
4.11 Continuity
4.11.1 In resistance mode, press “ FUNC ” to switch to
continuity mode.
4.11.2 Connect the red test lead to the input jack and the
black test lead to the “COM” jack.
4.11.3 Connect the test leads to the circuit.
4.11.4 If the resistance of the circuit is less than 50
Ω , a
buzzer will sound.
4.12 Diode
4.12.1 In continuity mode, press “ FUNC ” to switch to
diode mode.
4.12.2 Connect the red test lead to the input jack and the
black test lead to the “COM” jack.
4.12.3 Connect the red test lead to the anode (+) and the
black lead to the cathode (-) of the diode.
4.12.4 The meter will display the forward biased voltage
drop across the diode.
4.10 Resistance
Ω
4.10.1 Move the rotary switch to the position.
4.10.2 Connect the red test lead to the “
Ω ” jack and the
black test lead to the “ COM ” jack.
4.10.3 Connect the test leads to the circuit.
4.10.4 Resistance value will be displayed.
”
4.13 Capacitance
4.13.1 Move the rotary switch to the “
4.13.2 Connect the red test lead to the input jack and the
black test lead to the “
COM ” jack.
4.13.3 Connect the test leads to the circuit/capacitor.
4.13.4 Capacitance value will be displayed.
”position.
4.14 Frequency and Duty Cycle
4.14.1 Move the rotary switch to the “ Hz% ” position.
4.14.2 Connect the red test lead to the input jack and the
black test lead to the “
COM ” jack.
4.14.3 Connect the test leads to the circuit.
4.14.4 The measured frequency and duty cycle will be
displayed simultaneously.