Reading a KeyphasorŪ Tachometer Signal with a vb Instrument
The information provided is for help with Commtest Instruments products:
- vbSeries® instruments
QUESTION
I have a permanently installed online monitoring system. How can I connect my vb portable instrument to the buffered front panel jacks?
ANSWER
If your machine has a proximity-probe based tachometer sensor, such as a Keyphasor®), you can use this as the tachometer signal for your vb instrument. The sensor should have a buffered front-panel BNC output to ensure the vb instrument's measurements can't interfere with the online speed measurements. You will need to purchase an accessory cable for your vb instrument - the 3 meter Keyphasor® tach cable (Product code: CABK0108).
SETUP
Adjust the Keyphasor® proximity sensor gap so the driver box output is -8 V +/- 2 V (i.e. -6 V to -10 V) when the sensor is over the shaft. This is the normal mid-range position for these sensors. When the sensor is over the keyway its output will be -14 V to -22 V, depending on its make and model.
FAQ ID: 1309 Last Reviewed: 16 October 2006