Teledyne 300M Dark Current Signal Adjust Procedure, Output Voltage Range Changes

Teledyne API Model 300M CO Analyzer Instruction Manual, 04033, Rev. A

9.3 Dark Current Signal Adjust Procedure

The detector dark current change is negligible as the detector ages. Therefore this procedure should not need to be performed more than once per year or whenever a major sub-assembly is changed. To calibrate the dark current signal, press SETUP-MORE-DIAG-DARK-CALand the analyzer will automatically do the following:

1.Disconnect the detector output from the signal processing electronics.

2.Wait 2 minutes for electronics to stabilize at the dark value.

3.Average CO MEAS and CO REF reading for 1 minute.

4.Reconnect the detector output to the processing electronics to the processing electronics.

The average CO MEAS and CO REF dark reading are stored as offsets which are subtracted from all future CO detector readings.

Press SETUP-MORE-DARK-VIEWto view the current dark offset. Typical dark offset value is 125 ± 50 mV. Press EXIT when finished. No password is required to view the dark offset, only to change it.

9.4 Output Voltage Range Changes

Output voltage ranges are set by DIP Switch settings on the V/F board. To change the range for the analog outputs:

1.Turn off instrument power. Remove the instrument cover. Locate the V/F board near the top of the drawing using Figure 1-2.

2.Locate switches S1, S2, and S3 along the top edge of the card. Select the desired range by setting the switches as shown in Table 10-4.

NOTE

To adjust analog recorder offset, see Section 4.7.

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