GDM-541/533 User Manual
20
Caution
Do not input a voltage over 1000V or it may
damage the meter.
Be cautious to avoid electric shock when
measuring high voltages.
After completing the measurement,
disconnect the test leads from the circuit
under test.
Before each use, verify meter operation by
measuring a known voltage.
The input impedance of the AC mV range is
about 10MΩ. This load effect may cause
measurement errors in high-impedance
circuits. In most cases, if the impedance of the
circuit is below 10kΩ, the error ca
n be ignored
(≤0.1%).
The input impedance of the DC mV range is
infinite (about 1GΩ), and it does not attenuate
when measuring weak signals, so the
measurement accuracy is high. When the test
leads are open, there may be a value on the
screen, but this is normal and will not affect
the measuring result.
Frequency measurement at 60mV range (AC
voltage) is for reference only.
