Specifications

9
The LCD displays “1” indicating the existing selected
range is overloaded, it is required to select a higher
range in order to obtain a correct reading.
In each range, the Meter has an input impedance of
approx. 10MΩ. This loading effect can cause
measurement errors in high impedance circuits. If the
circuit impedance is less than or equal to 10kΩ, the
error is negligible (0.1% or less).
When AC voltage measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test.
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C. DC Current Measurement (see figure 4)
Warning
Never attempt an in-circuit current measurement
where the open circuit voltage between terminals
and ground is greater than 60V DC or 30V rms.
If the fuse burns out during measurement, the Meter
may be damaged or the operator himself may be
hurt. Disconnect power supply before making
measurement. Use proper terminals, function, and
range for the measurement. When the testing leads
are connected to the current terminals, do not parallel
them across any circuit.
( figure 4)
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Model UT39E: OPERATING MANUAL