amplifying and conditioning
amplifying and conditioning
(OP)
Can anyone tell me the essential different between a line drive supply and a charge amplifier for acc. sensors.? Whene to use what? And why is there a change in phase angle using charge?





RE: amplifying and conditioning
I don't know why there is a phase error associated with a charge amp. There wasn't on the ones I used, the entirely wonderful B&K 2635. There may be a signal inversion. Your calibration procedure will tell you if that is the case.
Cheers
Greg Locock
RE: amplifying and conditioning
I was looking in the B&K Master Catalogue and found that de line drive supply is basicly the same as a charge if used together with a 2644 or special line drive sensors.
RE: amplifying and conditioning
When you compared the two amplifiers, did you do it on the same input of the same data acquisition system/scope?
M
--
Dr Michael F Platten
RE: amplifying and conditioning
RE: amplifying and conditioning
More practically, set the two accelerometers up on a shaker and look at the outputs. You will learn many things.
Cheers
Greg Locock
RE: amplifying and conditioning
If you are running the high impedance signal through a single stage charge converter(line driver/ remote charge converter), you will see a 180° phase shift, as most RCC's are single stage converters.