Thermal Cycling of the Detector

If the resolution of a detector has degraded with no apparent reason and all the usual checks and adjnstments, such as pole-zero cancellation, fail to cure the problem it may be that a thermal cycle is necessary.  

Unidentified resolution problems may be a consequence of contamination of the detector itself, causing surface leakage currents. This contamination arises because of desorption of gases from the absorber within the vacuum 

2 Transistor reset and pulsed optical reset preamplifiers 

Auto-reset preamplifiers will not have an external test point. The quiescent preamplifier reset rate (that is, the 

The cure for those unexplained resolution problems may be a thermal cycle. Indeed, even the need for a thermal cycle is not indicated by an increased leakage current -a thermal cycle may be useful even if only to satisfy a diagnostic question. 

---