Dc Current Testing - UNI-T UT105 Operating Manual

Model UT105: OPERATING MANUAL
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. 10M . This loading effect can cause
measurement errors in high impedance circuits. If the
circuit impedance is less than or equal to 10k , 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)
18