UNI-T UT90A Operating Manual page 10

Model UT90A: OPERATING MANUAL
To avoid damages to the built-in fuse and the
Meter, please do not attempt parallel connect
the test leads with any circuit while the test
leads are inserted into the current terminal.
For the safety requirement, when measure
high current, every measure time should< 10
seconds and the time between two
measurements should > 15 minutes.
The measurement ranges of DC current are:
200mA,2mA,20mA,200mA,20A; The
measurement ranges of AC current are:
200.0µA,2.000mA,20.00mA,200.0mA and
20.00A. To measure current, do the following:
1 Insert the red test lead into the"µA
mA "or"20A"terminal and the black test
lead into the COM terminal.
2 Set the rotary switch to"A
Connect the test leads across with the
circuit being measured.
3. The measured value shows on the display,
it is an effective value of sine wave (mean
value response).
Note
l
Turn off the power of circuit being
measured before series connection
between the Meter and the circuit.
l
Use proper terminals and ranges for the
measurement.
l
Please use the ranges from high to low if
the current not being confirmed.
l
When current measurement has been
"or"A
10
",and