Screening Services and
Training
Last Update 07/13/2006
25092 Natama
Ct .
Laguna Hills, CA 92653-5607
How to: Calibrate the SCM-100 Accelerometer
Electronics using the Individual Accelerometer Sensitivities.
This procedure applies to systems manufactured by Screening Systems,
Inc. that use the SSC-2000 model vibration controller driving the
SCM-100 interface.
When the accelerometer transducers are calibrated a calibration sheet
is generated for each accelerometer. These sheets include the
actual transducer sensitivity in millivolts per g acceleration (mV/g).
Instead of using the SCM-100 Internal Signal Generator to
calibrate all the SCM-100
accelerometer electronics to the same sensitivity, each accelerometer
electronics channel may be calibrated to match the individual
transducer connected to that channel.
To perform this procedure, connect an external sine-wave function
generator (FG)
to the first accelerometer channel; Control Accelerometer 1 (X1) BNC
accelerometer input connector.
Set the FG to the millivolt sensitivity times 10 +/- 0.5
mVrms
for the particular accelerometer connected to this input. Set
the
FG to 464 +/- 10 Hz. sine-wave
output. For
example, if the accelerometer that will be connected to this channel
has a
sensitivity of 5 mV/g, set
the
function generator to 50.0 millivolts RMS
and
set
the
Input Level to10.00 gRMS. Or, if the transducer sensitivity is
9.87 mV/g, set the FG to 98.7 millivolts RMS
and the Input Level to 10.00 gRMS.
Select
“START (F2)”
and wait until the Seconds down-counter reaches zero.
If the accelerometer channel being
calibrated is a Control Accelerometer, select the corresponding
Averager
Control Accelerometer Input Channel bar and select “START
(F2)” again.
When
the Seconds down-counter has again reached zero,
either repeat the above steps for each additional accelerometer channel
to be calibrated
or if all calibrations are completed, select “EXIT
(F1)” and "YES" to save
the new
calibration data. Be sure to calibrate the Averager
Auxiliary1 Accelerometer 1 (X1) through Averager
Auxiliary 1 Accelerometer 6 (Z2) to match any product response
accelerometer sensitivities by inputting the FG to the appropriate
Auxiliary Accelerometer Input BNC connectors.
For systems that include an additional twelve response accelerometer
input circuits, calibrate
Averager Auxiliary 2 Accelerometer 1 (X1) through Averager
Auxiliary 3 Accelerometer 6 (Z2) to match any product response
accelerometer sensitivities by inputting the FG to the appropriate
Auxiliary Input BNC connectors.
This completes the calibration procedure.
For technical assistance contact Screening Services and Training via
e-mail. scrserv@cox.net
