UNI-T UT90A Specifications download pdf (Page 9)

Model UT90A: OPERATING MANUAL

9

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 ”or“V ”,and

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

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