© PCE Instruments
6
6.3
Changing the Accumulator
The battery indicator is located in the upper left hand corner of the display. A full bargraph is
displayed when the battery is fully charged. Even if the bargraph is empty the instrument can
still be used within its specifications for a certain period of time. When the battery voltage drops
under a critical value, the PCE-VC20 is switched off automatically.
The instrument is equipped with a NiMH accumulator providing power for approximately 5 hours
of operating.
To charge the battery, connect the supplied mains plug adapter (15 VDC) to the DIN socket at
the side of the case. The unit should preferably be switched off during charging. Charging will
take about 3 hours. During the charging process the battery indicator will be continuously
moving (Figure 3).
Figure 3: Charge indication
During the charging process the PCE-VC20 can be used for calibration. However, this will
extend the necessary charging time.
The accumulator should be changed at room temperature. At higher temperatures charging can
be stopped before reaching the full capacity because of the build-in temperature sensor.
The battery has no memory effect. Partial charging is permissible.
Permanent connection of the mains adapter is not recommended. This may lead to premature
wear of the battery. In order to avoid overcharging the battery, it is not recommended that you
disconnect and connect the mains adapter again immediately after charging is finished.
When the unit is not in use, the battery should be charged at least once a year.
The build-in battery is maintenance-free. Like all accumulators it has a limited number of
charging cycles. If the operating time with a fully charged battery becomes insufficient, the
battery should be replaced. In this case, the calibrator should then be returned to the
manufacturer will also the accuracy of the calibrator.
6.4
Reset
In the unlikely event that your PCE-
VC20 cannot be switched on by the “On/Off” key, it may be
necessary to press the Reset button. This button is found on the bottom side of the case near
the key pad. Use a thin non-metallic object, such as a toothpick, to press the button inside the
hole. This will start the instrument. Pressing the Reset button has no effect on accuracy.
7
Calibration
The vibration characteristics of the PCE-VC20 are very stable even after intensive use. Typical
changes are below 1% per year. We recommend annual re-calibration. In case of shock load,
dropping the instrument, etc. immediate recalibration is advised.
