17
Using external sensors
VibChecker can be used with all accelerometers of type
IEPE (ICP
®
) with voltage output.
To configure VibChecker for measurement with an
external vibration sensor:
1. Connect the sensor to the input connector (mini
coax).
2. Go to the Main display (A).
3. Use the arrow keys to navigate to the External sen-
sor icon (B), then press ENTER.
4. In the External sensor display (C), use the LEFT/
RIGHT arrow keys to position the cursor and adjust
the sensitivity with the UP/DOWN keys.
5. To select the appropriate unit (mV/m/s
2
or mV/g),
position the cursor with the LEFT/RIGHT keys. Press
the UP key to toggle and select a quantity.
6. To adjust the settling time (i.e. the time it takes for
the sensor to reach a stable output), position the
cursor with the LEFT/RIGHT keys. Set the correct
time using the UP/DOWN keys.
7. Press ENTER to save the settings and return to the
Main display.
Vibration sensors of type SLD and sensors from other
manufacturers have actual sensitivities and settling
times written on their calibration cards. When several
sensors are in use, they should be marked to assure
that the readings are calibrated.
Sensors with magnets (option)
The vibration sensors with magnets, TRM100 and
TRM120 (options), can be used for attachment to fer-
rous metal parts to reach measuring points in narrow
spaces and has the same construction and method of
operation as the built-in sensor.
The firmer the contact with the machine, the better
the measuring result. Plain, clean metal makes the
best contact surface for the vibration sensor. To get
comparable results, the measuring points should be
clearly marked, so that measurements can always be
taken in the same spots.
Before starting vibration measurements, make sure that
the sensitivity for the vibration sensor you are using
is properly set up. The sensors with integral magnet
TRM100/120 have a nominal sensitivity of 10.2 mV/m/
s
2
(individual value given on the calibration chart). The
settling time is 2 seconds.
TRM120
TRM100
Sensors with integral
magnet
A
Main display
B
C
External sensor
+
-
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