Teledyne API Model 200AU NOX Analyzer Instruction Manual, 02293, Rev. F
5-21
NOTE
You should now reset the expected span concentration values in the new
units and re-calibrate the instrument using one of the methods in Section 7.
Changing units affects all of the RS-232 values, all of the
display values, and all of the calibration values.
Example:
If the current units are in ppb and the span value is 400 ppb, and
the units are changed to ug/m3 the span value is NOT re-calculated
to the equivalent value in ug/m3. Therefore the span value now
becomes 400 ug/m3 instead of 400 ppb.
5.3.4.5 Recorder Offset
If necessary, the analog outputs can be biased. This can be used to offset the output voltage of
each channel ±10% of the current output voltage setting. It is intended for recorders that cannot
show slightly negative readings. It can also be used to bias the input to a datalogger to offset
small external ground loop voltages that are sometimes present in monitoring systems
The offset is set in the V/F calibration menu. Press SETUP-MORE-DIAG, scroll to A/D
CALIBRATION, then press ENTR. Select CFG-SET-OFFSET, then enter the desired offset and
press ENTR. Press EXIT to return to the SAMPLE mode.
5.3.5 Password Enable If password protection is enabled, a password is required to access calibration or setup menus. In
the VARS menu a password is always required. To enable passwords press SETUP-PASS-ON.
A list of passwords is in Table 5-7.
Table 5-7: Calibrate, Setup Passwords
Password Usage Password
Calibration Password Use to get into CAL menus 512, 101
Setup Password Use to get into SETUP menus 818, 101