500-003111-000
5-10
5.5.2
Internal Reference Voltage Calibration
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CAUTION
DO NOT INSTALL OR REMOVE THIS BOARD WITH POWER APPLIED TO THE SYSTEM.
a. Install the VMIVME-3111 board on an extender board in a slot of the
VMEbus backplane.
b. Ensure that the J25 and J40 jumpers have been removed, and install
jumper J26.
c. Apply power to the backplane. Allow a minimum warm-up interval of
ten minutes after power has been applied before proceeding.
d. Connect the positive lead of the DVM to test point TP5 (CAL REF) and
the negative lead to test point TP1 (REF RTN). Adjust R62 (REF ADJ)
for a DVM indication of +9.9512 ±0.0020 VDC.
5.5.3
Programmable Gain Amplifier (PGA) Calibration
5.5.3.1
Voltage Input Option Calibration
a. Connect the positive lead of the digital voltage source to Pin A1 of P2.
Jumper Pins A1 and C1 of P2 together. Connect the negative lead of
the voltage source to Pin A2 of P2. Place the J38 jumper in the J38-
1,2 (MAN ZERO) position.
b. Connect the positive lead of the DVM to test point TP4 (T/H INPUT)
and the negative lead to the test point TP1 (SIG RTN).
c. Select the Self-Test Zero input by writing 0000 to the Control and
Status Register (CSR) at board address 02. Select maximum gain
(x500) by writing 0003 to the PGA Gain Selection Register at board
address 0E.
d. Adjust R87 (MANUAL ADC ZERO ADJ) for a DVM indication of 0.00
±0.025 VDC.
e. Select the P2 differential channel 00 by writing 0100 (HEX) to the CSR.
f. Adjust the voltage source output to +10.000 VDC.
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