GW Instek GDM-356 User Manual

Page 15

The AC voltage measurement has 4 measurement
positions on the rotary switch: 2V, 20V, 200V and 750V

To measure AC Voltage, connect the Meter as follows:

Measurement Operation(3)

1. Insert the red test lead into the V

Ω

terminal and

the black test lead into the COM terminal.
2. Set the rotary switch to an appropriate measurement
position in V range.
3. Connect the test leads across with the object being
measured. The measured value shows on the display,
which is effective value of sine wave (mean value
response).

Note
l If the value of voltage to be measured is unknown,
use the maximum measurement position (750V) and
reduce the range step by step until a satisfactory
reading is obtained.
l The LCD displays "

"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 AC voltage measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test.

GDM-356