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8. Setting the Date and Time
When saving measurement values the date and time need to be correctly recorded. To set the date and time, open the main menu by pressing F3. From the main menu scroll down
by pressing ▼ to the menu option “Instrument
Settings” and press OK. Within this sub menu select “Time and Date”.
Figure 37: Setting time and data
Using keys ▲▼ you can adjust the chosen value. Upon reaching the maximum value, e.g. in the 23rd hour, the counter starts again from the beginning. Press ◄► to
skip between hour, minute, month, day and year. The date takes the leap year into consideration. It is, however, important to ensure that no invalid day-month
combinations are entered. Additionally, clock inaccuracy can be corrected. This can be done using the setting at “Cal.” in ppm (parts per million). The clock frequency
can be increased with positive values and decreased with negative. The sign changes to minus at +254 ppm.
Example: The clock is 5 seconds slow. There are 24 * 60 * 60 s = 86400 seconds in a day. The difference amounts to 5 s / 86400 s = 58 * 10-6 = 58 ppm. The
adjustable value is -58 ppm.
To exit the menu press OK followed by F3 repeatedly.
9. Calibration
The PCE-VM 25 comes with with a factory calibration, which is traceable to the reference standard of the Physikalisch-Technischen Bundesanstalt (PTB). The calibration is only
valid with the supplied vibration transducer.
The serial number of the instrument and the transducer are stated on the calibration certificate. The month and year of the factory calibration are displayed when the
instrument is switched on (cf. Figure 10).
The value set upon calibration is the sensor sensitivity in mV/ms-2. This can be viewed in the calibration menu.
Open the main menu by pressing F3. From the main menu scroll down with ▼ until you reach the menu option
“Sensor calibration” and select OK. Within this sub-menu select ‚By entering sensitivity‘. The displayed value is the sensor‘s calibrated sensitivity (Figure 38). It should
not be changed, unless a new calibration is being carried out. Press OK followed by F3 repeatedly to exit the menu.
Figure 38: Entering the sensitivity
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