Hello,

Not sure If I have the accelerometer sensor setup correctly for the Commtest Vb7. These are the sensors that came with the unit, and from what I can read on the side of the sensor, the are IMI Sensors. Model 603C01. From IMI's website, I grabbed the info doc on this sensor, and from what I can tell, it is 18-28 vdc, but Im not sure on if the enable drive current needs to be checked, and the DC Offset, its defaulted at 0, is it correct???

Sensor Doc

603C01_H.pdf (113 Kb, 15 downloads)

For the ICP accelerometer that you have, select Drive Current and use AC coupling. The input voltage level can be set to about 2x the highest g-level you expect. So if you expect 10-g maximum, then that is 1-volt (10-g x 0.100 v/g) and 2x is 2 volts. Pick 2-volts full scale or the next higher value.

Walt

quote:

Originally posted by Walt Strong:
For the ICP accelerometer that you have, select Drive Current and use AC coupling. The input voltage level can be set to about 2x the highest g-level you expect. So if you expect 10-g maximum, then that is 1-volt (10-g x 0.100 v/g) and 2x is 2 volts. Pick 2-volts full scale or the next higher value.

Walt

Thanks for the quick reply. So if I'm understanding you correctly, the input range and coupling should be set to AC and the drive current enabled? I had it prev set to AC as in the attached pic, but did not have the drive current checked. When I looked at the sensor doc, it showed dcv listed and thought that the AC was incorrect for this sensor. The voltage that is shown next to the AC, it what is listed when I use the pull down menu. One other question? When the AC is selected, another option is ungreyed out, and that is the "Bias Voltage Check". If I click the pull down, accelerometer is shown and if I select other, it takes me to a Bias Voltage Editor option. Do I change any thing in here or leave it alone? Or do I just leave the Bias Voltage Check window blank?

This is the bias voltage check screen

Just so you know; I don't use this product, so terminology might make for some misunderstanding. The accelerometer data sheet shows 8 to 12 VDC for output bias voltage, so I would use these values. Typically the analyzer measures the bias voltage and if it is too high, then an open circuit is suspect, and if too low then a short circuit is suspect. The general fault types could be in the accelerometer, cable or connector at either end of the cable. A vibration calibrator, other known source, or another meter/analyzer is always a good check that what you have set up is working correctly.

Walt

Hi XRACER
Attached is how the sensor setup is on my machine.

Over the years I have added, removed, and switched off parameter specs
I have not had to alter the sensor setup.
Hope this helps
Mike.

Sensor_setup.doc (158 Kb, 24 downloads)

Thanks for all your replies. After receiving clarification from Commtest, the sensor is to be setup as what mcdm's doc shows. But what still has me baffled, is the spec doc sheet from the sensor manufactures website. No where in the doc can I find were it states AC voltage..