Waters GCT Premier Operator's Manual page 257

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If the MCP voltage does not optimize, or if the increase in signal from
2800 V to 2900 V, is greater than 10%, lower the value of TDC signal
threshold by 10 mV and return to
step
2. If you have set the TDC signal
threshold to less than 10 mV the MCP, detector may need renewing.
Contact Waters for advice.
See also:
Contacting Waters on page
11-14.
Detector maintenance 10-53

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