User manual
30 GMC-I Messtechnik GmbH
Measurements: V/Hz, , , Temp (°C/°F), , M
@UISO
, A/Hz
Duty Cycle Measurement
(Function not available for METRAHIT ISO)
➭ Set the rotary switch to V~.
➭ Repeatedly press the FUNC | ENTER multifunction key until %
appears at the display.
➭ 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!
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 mA A
V
Tem p
MISO
1232.3
Hz
0002.0
%
Hz
%
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:
Hz t
E
/t
P
15 Hz ... 1 kHz 5 ... 95%
1 kHz ... 4 kHz 10 ... 90%
V~
Hz
%