User Manual

38 GMC-I Messtechnik GmbH
Measurements: V/Hz/dB – PQ/ – MHz/% – Ω/nS/R
SL
– / – Temp – /m – W/Wh – A/Hz/thd
5.1.6 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
periodic square-cycle 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
Temp
Ω
max. 5 V
!
1.0323
kHz
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 ... 1 kHz 2 ... 98 %
... 10 kHz 5 ... 95 %
... 50 kHz 10 ... 90 %