15
Measurement Operation(2)
Note
l
At 400mV range, the Meter has an input impedance
of 4000M
Ω
All other ranges the Meter has an input
impedance of 10M
Ω
This loading effect can cause
measurement errors in high impedance circuits. If
the circuit impedance is less than or equal to 10k
Ω,
the error is negligible (0.1% or less).
l
When AC voltage measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test.
DC voltage measurement
The DC Voltage ranges are: 400.0mV, 4.000V, 40.00V,
400.0V and 1000V. To measure DC voltage, connect
the Meter as follows:
1. Insert the red test lead into the
HzV
Ω
terminal and
the black test lead into the
COM
terminal.
2. Set the rotary switch to
V ; DC measurement is
default or press
SELECT
button to select DC
measurement mode.
3. Connect the test leads across with the object being
measured.
The measured value shows on the display.
Note
l
At 400mV range, the Meter has an input impedance
of 4000M
Ω
Except at 400mV range, all other ranges
the Meter has an input impedance of 10M
Ω
. This
loading effect can cause measurement errors in high
impedance circuits. If the circuit impedance is less
than or equal to 10k
Ω
, the error is negligible (0.1%
or less).
l
When DC voltage measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test.
Model UT90C: OPERATING MANUAL
