![background image](http://html1.mh-extra.com/html/mmf/vm24/vm24_instruction-manual_1813940010.webp)
In the case of constant acceleration (a) it is visible that the displacement value (d) de-
creases quadratically with increasing frequency (f). As a consequence the measuring
range limits of displacement measurements are strongly frequency dependent. 7 Dis-
plays the measurement range limits depending on frequency.
The maximum displacement of the VM24 that can be measured is around 60 mm
(RMS). It yields a frequency independent modulation range of up to 10 Hz. At higher
frequencies the measuring range limits for acceleration of around 240 m/s² take effect.
4. The Batteries
4.1. Inserting the Batteries
The VM24 is supplied by three alkaline standard cell type AAA (LR03) batteries.
NiMH batteries (HR03) may also be used. The minimum energy requirement of the
VM24 enables maximum utilization of the batteries.
Attention: Please switch the instrument off before changing the batteries. When
switched off, the contents of the memory are stored for a few minutes, without need
of the batteries, and the internal clock continues to run. If the batteries are removed
when the instrument is switched on or if they remain in the instrument until the bat-
teries have been completely discharged, the date and time will need to be reset. Fur-
ther settings as well as the saved measurands, are stored without need of the batter-
ies.
To insert the batteries, remove the two screws from the back cover of the device and
open the battery compartment (8). When inserting the batteries, please ensure that
their polarity is correct, (see the engraved markings inside the compartment).
8
Figure 7: Frequency response curves for displacement (RMS)
1
10
100
1000
0,1
1
10
100
1000
Integratorkennlinie
d: 5Hz-200Hz
Hz
m
m