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GMC-I Messtechnik GmbH
13
Frequency and Duty Cycle Measurement
13.1 Frequency Measurement
1 Set the function selector switch to V~ (V AC) (letter white)
and press the Hz/% key, as shown on
The frequency measurement mode is activated. „Hz“ sym-
bol is displayed on the LCD. The digital display is expanded
to 9999 digits. Only the auto mode, no manual range is
possible.
2 Connections are established in the same way as for volt-
age measurement.
3 The lowest measurable frequencies and the maximum
allowable voltages are specified in chapter 15 „Technical
Characteristics“.
13.2 Duty Cycle Measurement
With duty cycle measurement, we can determine the ratio of
pulse duration to cycle time of recurring square wave signals.
The duty cycle, which is the percentage pulse duration of a
signal, is displayed on the LCD as follows:
Note!
The applied frequency must remain constant during the
duty cycle measurement.
1 Set the function selector switch to V~ (letter white) and
press the Hz/% key twice as shown on page 23.
The duty cycle (%) mode is activated. The „%“ symbol is
displayed on the LCD.
Note!
The Hz/% key is only applicable for V~ (letter white).
Duty cycle (%) =
Pulse duration
Cycle duration
x 100
