ENDEVCO 2680
INSTRUCTION MANUAL
IM2680
Page 3-4
A.
Connect equipment as shown in Figure 3-2.
B.
Energize equipment and adjust power supply for +28 V dc output.
C.
Allow 15 minutes for equipment to temperature stabilize.
D.
Establish an Output Voltage (Eo) for the Charge Amplifier. The Output Voltage should be
less than the maximum Linear Output for the applicable Charge Amplifier.
E.
Again, the formula for input versus output is:
Eo x 103
Ein =
Aq x Cin
where
Eo = Output Voltage in volts
Ein = Input Voltage to T-Block form Oscillator in volts
Aq = Charge Amplifier Gain in mV/pC (see paragraph 4.2.)
Cin = Input Capacitance in pF. Includes Accelerometer Capacitance
(Cp) and Cable Capacitance (Cc) between Accel and T-Block
F.
Repeat steps 3.3.E through 3.3.I to establish a Charge Insertion Test for checking
Accelerometer Shorts and Charge Amplifier Integrity.
