User Manual

GMC-I Messtechnik GmbH 31
Measurements: V/Hz, , , Temp (°C/°F), , M
@UISO
, A/Hz
RPM Measurement (function only available with customer-specific variant)
Revolutions per minute (also known as rotational frequency) are
measured by acquiring pulses. As a prerequisite for this measure-
ment, the number of measurable pulses per revolution must first
be set in the RPM setup menu (vpm 0FF, see below).
➭ Set the rotary switch to V~.
➭ Repeatedly press the FUNC | ENTER multifunction key until RPM
is briefly displayed. The measured value then appears in RPM,
for example “244.3 r”.
Measured value RPM = revolutions per minute.
Parameter vpm = pulses per revolution.
Pulses per Revolution Setup Menu
1nFo
 ...  SET rAtE  ...  vpm
0ff/1 :1 ... 1000  
5.1.3 Transient Overvoltages
The multimeters are protected against transient overvoltages of up
to 6 kV with wave-front durations of 1.2 ms and halftimes of 50 s
in the voltage measuring range. If longer pulse durations are ex-
pected, e.g. when conducting measurements at transformers or
motors, use of our KS30 measuring adapter is recommended. It
provides protection against transient overvoltages of up to 6 kV
with wave-front durations of 10, and halftimes of 1000 s. Contin-
uous load capacity is 1200V
RMS
. Additional influence error caused
by the KS30 measuring adapter amounts to approximately –2%.
5.1.4 Voltage Measurements at Above 1000 V
Voltages of greater than 1000 V can be measured with a
high-voltage probe, e.g. the HV3
1
or the HV30
2
from
GMC-I Messtechnik GmbH. It is absolutely essential to earth the
ground terminal in this case. Observe all applicable safety precau-
tions!
1
HV3: 3 kV
2
HV30: 30 kV, for (DC) voltages only
RPM
Revolutions
min
--------------------------------
Pulses
Revolution
-----------------------------



x
60s
s
--------
=
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
COM mA A
V
Temp
 MISO
Voltage Measurements at Above 1000 V
with the HV3 High-Voltage Probe
Black
Red
Black
x1000
x100