GW Instek GDM-350A - Manual (Page 14)

14
Note
l If the value of voltage to be measured is unknown, use the maximum measurement
position (500V) and reduce the range step by step until a satisfactory reading
is obtained.
l The LCD displays “1” indicating the existing selected range is overload; it is
required to select a higher range in order to obtain a correct reading.
l In each range, the Meter has an input impedance of approx. 10M Ω . This loading
effect can cause measurement errors in high impedance circuits. If the circuit
impedance is less than or equal to 10k
Ω
, 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 GDM-350A: OPERATING MANUAL
Measurement Operation (2)