Measurement Operation(2)
Note
l If the value of voltage to be measured is unknown,
use the maximum measurement position (1000V) and
reduce the range step by step until a satisfactory reading
is obtained.
l The LCD displays “1” indicating the existing selected
range is overloaded, it is required to select a higher
range in order to obtain a correct reading.
l In each range, the Meter has an input impedance of
approx. 10MΩ. This loading effect can cause
measurement errors in high impedance circuits. If the
circuit impedance is less than or equal to 10kΩ, the
error is negligible (0.1% or less).
When DC voltage measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test.
B.DC Current Testing (see figure 4)
Warning
Never attempt an in-circuit current measurement where
the open circuit voltage between terminals and ground
is greater than 250V .
If the fuse burns out during measurement, the Meter
(figure 4)
Model UT105: OPERATING MANUAL
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