Factory Calibration Procedure (Quick Cal) - Teledyne 6400A Instruction Manual

TAI Model 6400A SO

9.1.6 Factory Calibration Procedure (Quick Cal)

This procedure is referred to in other TAI instruments as the "Quick Cal" procedure. It is used at the
factory when the instrument is first set-up.
The Factory Cal procedure balances the PMT, preamp, and software gain factors so the instrument
has optimum noise, linearity, and dynamic range. It should be used when you are unable to zero or
span the instrument, when the slope and offset values are outside of acceptable range, or when other
more obvious reasons for problems have been eliminated.
PMT Calibration Procedure:
Note: In this procedure a range of 500 ppb and a span gas concentration of 400 ppb is used as an example.
Other values can be used.
1. On the Preamp board, set S2 to 'B', set S1 to 2. Turn R19 25 turns counter-clockwise, then
12 turns clockwise. (Refer component location label inside of the Preamp cover.)
2. Adjust the UV lamp per Section 9.4.2 and reset the Lamp Cal value by selecting SETUP-
MORE-DIAG and scroll to select LAMP CALIBRATION. Reset the LAMP CAL value by
pressing ENTR. Value displayed is the current UV lamp intensity and pressing ENTR will
update the value.
3. Set RANGE MODE to SING by SETUP-RNGE-MODE to select single range operation.
4. Set the RANGE to 500 ppb by SETUP-RNGE-SET and key in 500, then press ENTR.
5. Input 400 ppb of SO
6. Scroll to the PMT - TEST function.
7. Calculate the expected PMT mV reading.
For ranges up to 2000 ppb;
PMT mV= (span gas concentration x 2)
For ranges above 2001 up to 20000 ppb;
PMT mV= (span gas concentration x 0.2)
8. Adjust S2, the HVPS coarse adjustment, on the preamp board to the setting that produces a
signal that is closest to expected value. Adjust S1, the HVPS fine adjustment, to the setting
that produces a signal that is closest to expected value. Use R19 to trim the reading to final
fine adjustment.
Analyzer Operator Manual, 02164, Rev. G
2
span gas in the sample inlet port.
2
Sample Pressure
9-21
+ offset(mV)
29.9
Sample Pressure
29.9
+ offset(mV)