UNI-T UT58A, Operating Manual

Page: 18 / 36

Measurement Operation(4)
The resistance ranges are:
Model UT 58A/UT58B:200
Ω
, 2k
Ω
, 20k
Ω
, 2M
Ω
,20M
Ω
and
200M
Ω
.
Model UT 58C:200
Ω
, 2k
Ω
, 20k
Ω
, 2M
Ω
and 20M
Ω
.
1. Insert the red test lead into the Hz V
Ω
(UT58C) or
V
Ω
(UT58A/UT58B) terminal and the black test
lead into the COM terminal.
2. Set the rotary switch to an appropriate measurement
position in
Ω
range.
3. Connect the test leads across with the object being
measured.
The measured value shows on the display.
black red
(figure 6)
Note
l
The test leads can add 0.1to 0.2
Ω
of error to the slow-
resistance measurement. To obtain accurate readings
in low-resistance, short-circuit the input terminals
beforehand and record the reading obtained (called
this reading as X). (X) is the additional resistance from
the test lead. Then use the equation:
measured resistance value (Y) – (X) = accurate readings
of resistance.
l
If the input terminal short-circuit reading 0.5,check
the test leads for any looseness or other cause.
l
For high resistance (>1M
Ω
), it is normal taking several
seconds to obtain a stable reading; select short test
leads for stable and precise readings.
l
When the resistance is higher than the maximum range
or in open circuit condition, the Meter displays “1” .
l
When resistance measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test.
Model UT58A/B/C: OPERATING MANUAL
18