346B User Manual Publication No. 980956 Rev. A
Calibration Procedure 4-2
Astronics Test Systems
1. Connect the AC Voltmeter to the mV OUTPUT jack of the calibrator.
2. Select the SIN RMS mode. Set the frequency for 500.0 Hz and the level for
9999 millivolts (refer to
Chapter 2
Operation).
3. Set the Level ADJ R2,
Figure 4-2,
for an indication of 9999 ±2 millivolts on the
AC voltmeter.
Figure 4-2, Adjustment Resistor R2
4. Select the SQ PK-PK mode.
5. Connect the oscilloscope to the mV OUTPUT.
6. Check that the rise and fall time (10 to 90%) are less than 1.2 µs at 10, 100,
1000, 10000, and 100000 Hz.
PC Output
The pC OUTPUT should vary less than ±0.5% from the mV OUTPUT. This
procedure provides a means of checking the pC OUTPUT.
The method used is to compare the voltage to picocoulomb converter at the pC
OUTPUT with a known converter, the 2030 Voltage to Charge Converter. The
2030 Voltage to Charge Converter is a precision 1000 pf capacitor with the proper
shielding to assure noise free measurements.
1. Connect the input of the 2030 Voltage to Charge Converter to the Calibrator
mV OUTPUT.
2. Connect the charge output of the Voltage to Charge Converter to the ACCEL
input of the charge amplifier 203M or equivalent.
3. Set the charge amplifier input to 10 pC/g, and the LP filter to HIGH.
4. Select the SIN PK mode. Set the frequency for 500 Hz and the level for 9999
millivolts.
5. Use the sensitivity controls to set the meter for an indication of the charge
amplifier for exactly 1000 g's.
