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MArN
CTRCUTT ASSETVBLy
(03490-6650r)
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RATIO REFERENCE ASSEMBLY
OPTION
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(O349O.66513)
INPUT
PROTECTION
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EXTERNAL REFERENCE
AMPLIFIE
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RATIO L TO
DATA
OUTPUT
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R3II. R32O. AND JUMPERS WI-W4
LOCATED
ON
AIAI.
2. JUMPER WIRES WN-WO ARE
REMOVED
IF
RATIO
OPTION IS
INSTALLED.
PRINTED
CIRCUIT BOARD,-hp- PART NO.
O349O-66526
SUPPLIED WITH RATIO OPTION. MUST
BE
INSERTED IN
J6
TO
MAKE THESE
CONNECTIONS
IN
ORDER
TO
OPERATE
INSTRUMENT
WITH
RATIO ASSEMSLY REMOVED.
3.
+REF.+REF
SENSE. AND
INPUT
TO INVERTING
AMP ALL
CONNECT TO SAME POINT ON
A2
(A2U2
PINzOL
4. tF
rT
ts NECESSARY TO REPLACE
OCR3OI,
R3O6,30S,3rO,
3I3,3I4, AND 3I5 MUST ALSO
BE REPLACED. THESE
MATCHED RESISTORS ARE
SUPPLIED WITH THE
REPLACEMENT REFERENCE
OCR3OI.
5. IF
UI
IS
NOISY, READINGS WILL 8E
OUT OF
TOL€RANCE AT
THE LOW END.
6.
IF
RATIO
BOARD IS PUTTING READING INTO
OVERLOAD,
REPLACE
U5.
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INPUT
COMPENSATION
AMPLIFIER
76K
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