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OPE RATION 



FUNCTION OF CONTROLS AND CONNECTORS 



1. QN-Off Switch - The ON-OFF Switch turns on battery power. 



2. BATTERY INDICATOR - Turn-on of the red LED indicator light 

 indicates the end of useful battery life. No light indicates 

 adequate battery voltage for operation of the instrument. 



3. BATTERY CHARGE CONNECTOR - This connector allows charging 

 of the rechargeable batteries from the battery charger. 



4. AUDIO PLUG - A modified test signal is available at this 

 jack intended for audio detection by headphones. The modi- 

 fied signal can also be recorded by a strip chart recorder 

 or a cassette recorder. 



5. RECORD PLUG - The unmodified test signal is available at 

 this jack. It can be recorded by a strip chart recorder or 

 a cassette recorder. The unmodified signal can also be 

 monitored by earphones. 



6. VOLUME POTENTIOMETER - This potentiometer controls the 

 volume at the Audio Plug. 



7. Detection Level Potentiometer - This potentiometer controls 

 the signal level at the Audio Plug at which fault signals 

 are detected. 



8. SIGNAL ENHANCE POTENTIOMETER - This potentiometer controls 

 the degree to which that part of the signal at the Audio 

 Plug above the detection level is enhanced, and that part of 

 the signal below the detection level is suppressed. 



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