GW Instek GDM-356 - Manual (Page 14)

14
Measurement Operation(2)
Note
l If the value of voltage to be measured is unknown,
use the maximum measurement position (1000V)
and reduce the range step by step until a satisfactory
reading is obtained.
l 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.
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.
B. AC Voltage Measurement (see figure 4)
Warning
To avoid harms to you or damages to the Meter from
electric shock, please do not attempt to measure
voltages higher than 1000V or 750V rms
although
readings may be obtained.
( figure 4)
GDM-356