UNI-T UT20B Operating Manual page 22

2. Connect the test leads across with the object being measured.
The measured value shows on the display.
Note
l
If the value of voltage to be measured is unknown, use the maximum measurement
position (300V) and reduce the range step by step until a satisfactory reading
is obtained.
l
In each range, the Meter has an input impedance of 1M . This loading effect
can cause measurement errors in high impedance circuits. If the circuit impedance
is less than or equal to 1k , 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 UT20B: OPERATING MANUAL
Measurement Operation (12)
22