Model UT90C: OPERATING MANUAL
14
circuit for the tested resistor or the resistor
value is higher than the maximum range of
the Meter.
z
To measure online resistance, please turn
off power of the circuit and discharge all
capacitors.
z
The test leads can add 0.1
Ω
to 0.2
Ω
of error
to resistance measurement. To obtain
precision readings in low-resistance
measurement, short-circuit the test leads
beforehand, then press
button, the
reading on the display goes to“
0
”. 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) =
precision readings of resistance.
z
When the resistance reading
≥
0.5
Ω
in the
shorten-circuit, please check for loose test
leads, or choose the wrong range, or if
start-up the
HOLD
mode.
z
For high-resistance measurement (>1M
Ω
),
it is normal taking several seconds to
obtain a stable reading, and it is better to
choose short measuring cable.
z
Open-circuit voltage of resistance
measurement is about 0.45V.
z
When resistance measurement has been
completed, disconnect the connection
between the testing leads and the circuit
under test.
D. Diodes Measurement (see figure 6)
