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Maintenance & Troubleshooting 5.0
to 9.00 volts. When the zero fluid concentration (C
other value, proceed as follows:
Estimate the absorbance change (A
changes in concentration. Then from the concentration of the
component of interest in the zero fluid (C
meter reading (M
) calculate the voltage setting at TP3 for the
fs
zero fluid (V
).
z
log (V
) = - (A
z
9
Example: If A
= 1 unit
fs
M
= 10%
fs
C
= 1%
z
Then:
log V
= - (1) (1)
z
9
log V
9
10
V
= (9) (0.79) = 7.15 volts
z
15. On the chopper stabilized log board place a DMM at TP1 (red).
Adjust the coarse ZERO control on the analysis unit to give an
output equal to (C
/C
z
the chopper stabilized log board for a full scale deflection, which
equals 400 mV. For example, if:
C
= 1%
z
C
= 10%
fs
then the voltage output at TP1 will equal
(1/10)(400 mV) = 40 mV.
16. Set the span control on the control unit to 500.
17. Adjust the fine ZERO control on the control unit to give a meter
reading equal to C
z
18. Re-check the peak voltages on the switch driver and clamp
circuit at TP1 (violet). If the peaks have increased, it is probably
due to outgassing in the sample cell caused by improperly
locked-in sample, or by a leak in the system. Correct the problem
and repeat steps 10 thru 20.
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
) expected for full scale
fs
) and the full scale
z
) C
fs
z
M
fs
10
z
-.1
= 10
)(V
). V
equals the voltage output from
fs
fs
fs
.
) is some
z
5–27
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Troubleshooting
