Teledyne 6400A Instruction Manual page 157

Sulfur dioxide analyzer
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TAI Model 6400A SO
EXIT to terminate. The exact voltage values depend on the DIP switch settings on the analog
output buffer amplifiers.
To calibrate the 4-20 mA current output option, do the following:
Verify ± 5 volt output DIP switch setting (refer Figure 9-3) for 4-20 mA option before
proceeding with the following procedure, since the input voltage of the isolated 4-20 mA
converter hardware is configured for 0 - 5 volt range (0 - 10 volt for non-isolated). The 4 -
20 mA calibration procedure should be performed after verifying the voltage calibration as
above.
1. Connect the 300 - 1000 ohm resistor to one of the 4-20 mA recorder output terminal 1 or 2
(refer Figure 2-2). Connect in series the DC current meter between the resistor and other
terminal of the recorder output with proper polarity.
2. Press SETUP-MORE-DIAG-ENTR and scroll down to the D/A CALIBRATION diagnostic
mode, press ENTR to start the procedure. Press CFG and scroll by pressing NEXT to select
desired current output channel, press SET-CURR-ENTR to define current output channel.
3. Press CAL to start the calibration. The 6400A display will read
"x)CONC_OUT_X,CURR,ZERO", where X the output channel number. Press the up/down
buttons on the front panel until the current meter displays 4.0 mA (± 0.1mA). When the
current meter shows a stable 4.0 ± 0.1 mA, press ENTR.
4. The 6400A display will now show "x)CONC_OUT_X,CURR,GAIN". As before, press the
up/down buttons on the 6400A front panel until the current meter reads 20.0 ± 0.1 mA.
5. Repeat step 1 through 4 for additional current channel output calibration. Each current
channel must be calibrated separately. When completed press EXIT to return to upper level
menus.
6. Verify that the analog output is correct by performing SETUP-MORE-DIAG-ANALOG
OUTPUT (see Section 9.1.3.4). The current meter should read 4, 7.2, 10.4, 13.6, 16.8, and 20
mA accordingly.
Analyzer Operator Manual, 02164, Rev. G
2
9-39

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