500-003111-000
5-11
g. Adjust R66 (CMRR ADJ) for a DVM indication of lowest positive
reading.
h. Adjust the voltage source output to +0.0200 VDC.
i. Remove the jumper between Pins A1 and C1 of P2. Connect the
negative lead of the voltage source to Pin C1 of P2. Jumper pins C1
and C2 of P2 together.
j. Verify a DVM indication of +10.000 ±0.100 VDC.
k. Select a PGA gain of x100 by writing 0002 to the PGA Gain Selection
Register.
l. Adjust the voltage source output to +0.1000 VDC. Adjust R59 (x100
ADJ) for a DVM indication of +10.000 ±0.002 VDC.
m. Select a PGA gain of x1 by writing 0000 to the PGA Gain Selection
Register.
n. Adjust the voltage source output to +10.000 VDC. Verify that the DVM
ind10.000 ±0.002 VDC.
5.5.3.2
Current Input Option Calibration
a. Adjust the current source output to 0.0 mA. Connect the positive lead
of the current source to Pin A1 of P2. Connect the negative lead of the
current source to Pin C2 of P2. Place the J38 jumper in the J38-1, 2
(MAN ZERO) position. Install jumper J24.
b. Connect the positive lead of the DVM to test point TP4 (T/H INPUT)
and the negative lead to the testpoint TP1 (SIG RTN).
c. Select the Self-Test Zero input by writing 0000 to the Control and
Status Register (CSR) at board address 02.
d. Select maximum gain (x500) by writing 0003 to the PGA Gain
Selection Register at board address 0E.
e. Adjust R87 (Manual ADC Zero Adj) for a DVM indication of 0.00
±0.025 VDC.
f. Select the P2 single-ended channel 00 by writing 0200 (Hex) to the
CSR.
g. Adjust the current source output to +0.080 mA.
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