GW Instek GDM-398 - Manual (Page 23)

GDM-360/397/398/461 User Manual
21
GDM-360/461: Displays the true rms value.
5. Press Hz% (GDM-360/397/398) or the yellow button (GDM-461) to obtain the
frequency and duty cycle value.
 Input Amplitude: (DC offset is zero)
 Input Amplitude:≥range×30%
 Frequency response:GDM-397/398: ≤400Hz, GDM-360/461: ≤
1kHz
Note
 If the value of the current to be measured is unknown, set to the highest range
and reduce the range step by step until a satisfactory reading is obtained.
 For safety, the measurement time for currents greater than 5A (>5A) should be
less than 10 seconds and the interval time between 2 measurements should be
greater than 15 minutes.
 When current measurement has been completed, disconnect the connection
between the testing leads and the circuit under test, and remove the testing leads
from the input terminals of the Meter.