CA-500 Series S/M 4-7 Revised December 2001 8
(3) Low Sensitivity Adjustment (Gain Adjustment)
1) Insert the heated low sensitivity scattering stick (labeled usually as “430”) into the detector well to be
adjusted (CH1 to 4).
2) Close the light shield cover.
3) Select channel 1 by using [Channel Change] key, select Low Gain by using [Sensitive] key, and select
[Gain] position by pressing [n] or [p] key.
4) Press [Auto Adjust] key to start the automatic gain adjustment, and when the adjustment is
completed, the alarm sounds.
5) Change the sensitivity to PT Gain, and verity that both Offset and Gain values for PT Sensitivity are
automatically set when changing Offset and Gain values for Low Sensitivity.
To set PT sensitivity individually, execute the same procedure as (1) Offset Adjustment and (3) Low
Sensitivity Adjustment or enter values manually using numeric keys.
6) Execute Steps 1) to 5) for channels 2 to 4.
NOTE: The gain adjustment and the offset adjustment have an influence on each other,
therefore, reconfirm that the set value after each adjustment is within the specified
range of values. Refer to 5.9.2 Detector Block Adjustment Value for default value.
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