Drawing Number: 21210
Revision: NR
AN IMPROVED TECHNIQUE FOR
UTILIZATION OF CONFORMAL BALLISTICS
SENSOR CALIBRATION DATA
6
Calibrate Signal Insertion
Another method that is useful especially when utilizing
a storage oscilloscope readout is to use a charge
calibrator to inject a full scale charge signal into the
charge amplifier. Multiply the sensor slope value by full
scale pressure to find full scale picocoulombs.
40,000 psi x .250 pC/psi = 10,000 pC
Set the charge calibrator for 10,000 pC and apply this
signal to the input of the amplifier. Now adjust the gain
of the oscilloscope (or charge amplifier if gain adjust is
available) to make full scale equal to a selected number
of oscilloscope divisions.
For example: 6 Div = 40,000 psi
Now the peak value can be determined from the
oscilloscope face or scope photo using a
variable scale
or other interpolative methods.
Then, add the offset pressure to this value to determine
true peak pressure.
