Hitachi 902 - Confirmation of ISE AMP Voltage; ISE AMP Board; ISE AMP Board Signal Address

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10.11 ISE AMP Board
(1) Explanation of Circuit Board
This amplifier is intended to amplify the ion selective electrode (ISE) signal. The input
signal includes Na, K, Cl, Ref.
(2) External View
(3) ISE AMP Board Signal Address
Signal Name ENa EK ECI ERef E2 E8
Multiplexer address 7 6 5 4 3 2
SW1 address 7 6 5 4 3 2
< Confirmation of ISE AMP Voltage >
Confirm the voltage between TP1 and TP2.
(a) Select ERef (SW no. 4) with the multiplexer and confirm that the output is 4.69 <
ERef < 5.05.
(b) Select E2 (SW no. 3) with the multiplexer and confirm that the output is 2.00 ±
0.005 V. [adjustment of VR1]
(c) Select E8 (SW no. 2) with the multiplexer and confirm that the output is 8.00 ±
0.005 V. [adjustment of VR2]
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