User Manual

GMC-I Messtechnik GmbH 35
V/Hz/dB – , Temperature, and A/Hz Measurements
5.1.5 Frequency and Duty Cycle Measurement
Ð Set the rotary switch to MHz or %.
Ð Connect the measurement cables as shown.
Make sure that a current measuring range (“A”) has not been acti-
vated when the multimeter is connected for frequency or duty
cycle measurement!
Attention!
!
The applied signal voltage may not exceed 5 V.
Frequency Measurement, MHz
A 5 V signal with a frequency of up to 1 MHz is measured and dis-
played using MHz as a unit of measure. The pulse frequency is
the reciprocal value of the pulse period.
Duty Cycle Measurement t
E
/t
P
The ratio of pulse duration to pulse period is measured with peri-
odic square-wave signals and is displayed as a percentage.
Note

The applied frequency must remain constant during duty
cycle measurement.
Duty cycle (%) =
Pulse duration (t
E
)
Pulse period (t
P
)
 100
COM
V
Tem p

002 .00
%
MHz
%
MHz
%
U
t
t
E
t
P
t
E
/t
P
Pulse Time Quantities
f
P
pulse frequency = 1/t
P
t
E
pulse duration
t
P
pulse period
t
P
– t
E
interpulse period
t
E
/t
P
pulse or duty cycle
f
P
FUNC
ENTER
Measuring Ranges:
fp pulse frequency range
Hz t
E
/t
P
15 Hz to 1 kHz 2 to 98%
Up to 10 kHz 5 to 95%
015 . 000
Hz
kHz
Max. 5 V
!
Hz
01.0323