© PCE Instruments
5
Please note that heavy connecting cables should be supported close to the test object.
However, an application of force via the cable must be avoided.
The maximal torque rating of
1 to 2 Nm
at the vibration exciter must not be exceeded since this
may damage the instrument.
The PCE-VC20 should be placed on a rigid surface. Hand-held operation is not recommended
because of possible errors.
6.2
Calibration
After attaching the device under test switch the PCE-
VC20 on by depressing the “On/Off” button
until the display lights up. Device information, such as hardware and software versions and the
date of the last calibration, is displayed for a few seconds. After short time the vibration signal
becomes stable. The display shows the values of vibration frequency and magnitude (Figure 2).
Please note that these are not measuring value but only normal values.
Figure 2: Display in calibration mode
In the upper right hand corner you will see the actual accuracy of the vibration magnitude in
percent. After short period of time the percent value should converge on zero.
If the absolute error exceeds 3%, the percent value will change to inverse characters and a
beep sound will be generated. In this case no calibration can be performed.
When the maximum weight of the test object is exceeded, instead of the percent value, an error
message “OVERL” will appear and the shaker will be switched off. To proceed with calibration,
first switch the calibrator off. Then reduce the weight of the test object and switch the calibrator
back on. The admissible weight is up to 500 grams, depending on the selected frequency. The
overload message can also be eliminated by lowering the vibration magnitude.
In the lower display line the date of the last calibration of your PCE-VC20 is displayed. This
entry can only be modified during factory calibration. Please read also section 5 for details about
calibration.
The PCE-
VC20 can be switched off by depressing the “ON/OFF” key for at least one second.
Should this be omitted, a timer is provided which switches the calibrator off after 10 minutes.
Caution:
The vibration calibrator is not to be used in dirty and dusty environments. Particular
care should be taken that no ferromagnetic particles get inside of the instrument: They may
damage it within short time. Defects due to dirt and dust are not covered by the warranty.
