Current Measurement; Non-Contact Ac Voltage Induction Detection - Mastech MS8232B User Manual

5-8 Current Measurement

Warning
In order to avoid the meter or measured equipment from
being damaged, firstly check the fuse of the meter
before measuring current.
When measuring, please use correct input socket,
function shift and measuring range.
Don't try to measure current when the open circuit
voltage exceeds 250V.
The DC current range:
400uA, 4.000mA, 40.00mA, 400.0mA
The AC current range:
400uA, 4.000mA, 40.00mA, 400.0mA
The method of measuring current is:
1. Cut off the power of measured circuit. Discharge all
high voltage capacitance on measured circuit.
2. Turn rotary switch to mA or uA position.
When the measured current is less than 400uA, select
u A position.
When the measured current is 4mA~400mA, select
mA position.
3. Disconnect the circuit under test. Connect black test
pen to the end of disconnected circuit under test (with
lower voltage), connect red test pen to the other end
of disconnected circuit under test (with higher voltage).
4. Switch on the power of the circuit, and then read out
displayed reading. If the display only displays "OL",
it will show that the input exceeds selected range,
and the rotary switch shall be placed at higher range.
5. Cut off the power of measured circuit. Discharge all
capacitances, take off the test pen and recover the
circuit.
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Notice:
1. The measuring current of the meter shall be
connected in series, not connected in parallel to
avoid from damaging the meter or endangering
personal safety.
2. When measuring DC current, if the test pen is
reversely connected to the circuit, the display will
change into negative, but not affect measuring
accuracy.

5-9 Non-contact AC Voltage Induction Detection

Warning
Before measuring hazardous voltages, first check the
voltage indicated to determine if the equipment can
operate correctly.
The function may occur wrong warning because of
different outside interferences.
The measured result is for reference only when using.
Make the top of the meter close to measured circuit, if
more than AC110V voltage exists in the circuit, the
110V indicator light will be lightened because of meter
induction. If more than AC220V voltage exists in the
circuit, the 110V and 220V indicator lights will be
lightened at the same time because of meter induction.
Notice:
1. Even if there is no indication, the voltage still may
exist.
Don't rely on non-contact voltage detector to judge
if the lead exists voltage.
2. The detection operation may be affected by different
socket design, insulation thickness and types.
3. When inputting voltage into meter input terminal, the
voltage induction indicator light may lighten because
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