Ac/Dc Current Measurement - UNI-T UT90A Operating Manual

Model UT90A: OPERATING MANUAL
AC/DC voltage, connect the Meter as follows:
1. Insert the red test lead into the"VO)"
terminal and the black test lead into the
COM terminal.
2. Set the rotary switch to"V
Connect the test leads across with the
power or load being measured.
3. The measured value shows on the
display, which is an effective value of sine
wave (mean value response).
4. In each range, the Meter has an input
impedance of 10MO. This loading effect
can cause measurement errors in high
impedance circuits. If the circuit impedance
is less than or equal to 10kO, the error is
negligible (0.1% or less).
5. Manual Impedance Changeover
Button"10MO/400kO"can be used to check
inside impedance of supply power under
250V MAX.
Note
l
When AC/DC voltage measurement has
been completed, disconnect the connection
between the testing leads and the circuit
under test.
l
Pay attention to avoid harms to you from
electric shock during high voltages
measurement.
B. AC/DC Current Measurement (see figure
4)
Warning
"or"V
9
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