32
GMC-I Messtechnik GmbH
V/Hz,
, Temperature,
and A/Hz Measurements
5.1.4 Frequency and Duty Cycle Measurements
(METRA HIT AM XTRA / X-
TRA
/ O
UTDOOR
/ SECULIFEHIT
AM
/
MD
only)
➭
Set the rotary switch to MHz or %.
➭
Connect the measurement cables as shown.
Make sure that a current measuring range (“A”) has not been
activated 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
displayed using MHz as a unit of measure. Pulse frequency
demonstrates the reciprocal value of pulse period.
Duty Cycle Measurement, t
E
/t
P
The ratio of pulse duration to pulse period is measured with
periodic square-wave signals and 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
Max. 5 V
!
1
.
0323
MHz
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:
MHz
t
E
/t
P
100 Hz ... 1 kHz
2 ... 98%
... 10 kHz
5 ... 95%
... 100 kHz
10 ... 90%
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.com
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