11. Sensor Check
The VM22 input is designed for use with a low power IEPE accelerometer. These
sensors are supplied by constant current, which produces a positive DC voltage po-
tential at the output. Due to this DC voltage an assessment can be made of the sen -
sor's operating condition. The VM22 detects three operational conditions:
< 0.1 V:
short circuit
0.1 – 11 V:
in working order
>11 V:
open input, e.g. broken cable
If a short circuit occurs or the input is open the instrument will display “SENSOR
ERROR” instead of the measurand.
12. Reset Key
If it occurs that the VM22 does not respond to the press of any button, press the re -
set key to restart the instrument. The reset key is reached with a thin object through
the aperture next to the type label (26).
Saved data and settings are not lost when the instrument is reset.
13. Connection to a PC
13.1. Device Driver
The VM22 has a USB serial interface. For connection to a PC the supplied VM2x-
USB cable can be used (27), which is connected to the 8 pin socket on the VM22.
Please switch the instrument off before connecting it to the PC.
21
Figure 26: Reset Key
Figure 27: USB Cable VM2x-USB
Содержание VM22
Страница 4: ...2 Figure 1 VM22 with sensor...
