Teledyne 9110T - Nitrogen Oxides Analyzer - Manual (Page 354)

Model 9110T NOx Analyzer Principles of Operation
Teledyne Analytical Instruments 354
Note These adjustments should only be performed when encountering
problems with the software calibration that cannot be rectified otherwise.
See Section 12.8.4 for more information about this hardware calibration.
Figure 13-22: PMT Preamp Block Diagram
The PMT preamplifier PCA also operates two different tests used to calibrate and check the performance
of the sensor module.
 The electrical test (ETEST) circuit generates a constant, electronic signal intended to simulate the
output of the PMT (after conversion from current to voltage). By bypassing the detector’s actual