6400A Internal Variables - Teledyne 6400A Instruction Manual

TAI Model 6400A SO
9.1.3.5 DAC Calibration
The Digital to Analog Converters (DAC) are calibrated when the instrument is set up at the factory.
Re-calibration is usually not necessary, but is provided here in case the V/F board needs to be
replaced and re-calibrated. The procedure for using the DAC Calibration routines are in the
Troubleshooting Section 9.3.3.1.
9.1.3.6 RS-232 Port Test
This test is used to verify the operation of the RS-232 port. When started, it outputs the ASCII letter
X for about 2 seconds. During the test it should be possible to detect the presence of the signal with a
DVM. A detailed procedure is given in the Troubleshooting Section 9.3.2.

9.1.4 6400A Internal Variables

The 6400A software contains many adjustable parameters. Many of the parameters are set at
time of manufacture and do not need to be adjusted for the lifetime of the instrument. It is
possible to change these variables either through the RS-232 port or the front panel. Altering the
values of many of the variables, especially those not listed on Table 9-5, will adversely
affect the performance of the instrument and could possibly affect the EPA equivalency
designation. Therefore it is recommended that these variables not be adjusted unless you have a
clear understanding of the effects of the change.
Table 9-5 contains a description of "easy variables" which do not require special password from
the front panel. "Hard variables" require special password and contact factory if you need to
adjust them. "V LIST" of RS-232 will list all the variables except those that should never be
manually edited.
To access the VARS menu press SETUP-MORE-VARS-ENTR. Use the PREV-NEXT button to
select the variable of interest and press EDIT to examine/change the value, then press ENTR to
save the new value. If no change is required, press EXIT.
Analyzer Operator Manual, 02164, Rev. G
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