Designed for detection of hookswitch bypasses and devices on wire pairs the 1080AVS can measure breakdown voltages of up to 500 VAC.  The unit is NOT intended for use on electronic telephones as it can seriously damaged or destroy them.  When used on hookswitch contacts it can determie the presence of foreign devices which would render the telephone useful for eavesdropping when the telephone is hung up. When used for cable analysis it can find foreign devices such as carrier current transmitters or line operated transmitters located within appliances such as lamps, radios, television sets, etc.  

TELEPHONE USE:   Disconnect the telephone from the telephone line, remove the cover and tape the hookswitch in the down position.  Disconnect one of the two ringer leads . Connect the 1080AVS to either of the two hookswitch contacts.  Press the TEST switch.  The pattern should remain a circle. A foreign device will create a patten similar to those to the right. A capacitor will cause the pattern to tilt and become oblong. "Test the other set of hook-switch contacts. Again, the pattern should remain circular.

CABLE USE:  The 1080AVS may be used on virtually any AC powered appliance or cable pairs.  Following are a few examples.

TESTING A LAMP: Turn on the lamp to be sure it is functioning.   Unplug it and remove the light bulb. Connect the 1080AVS across the two leads and press the TEST switch. The pattern should remain circular.   Foreign devices will create patterns such as those to the right.  Any capacitors on the line will cause the pattern to tilt and become oblong.

TESTING A RADIO OR TELEVISION SET:  Turn on the TV to make sure they are operating correctly.   Turn the radio or TV off and unplug it from the line. Connect the 1080AVS to the plug and press the TEST switch. The pattern should remain circular. Occasoinally the set will have a capacitor or capacitor/resistor network accross the line. These circuits will cause either a straight line (resistor) or oblong (capacitor) pattern.  Remove any such networks.

TESTING A CABLE: Assume a cable running from a microphone to an amplifier.  Remove the microphone and disconnect the wire from the amplifier.  Connect the 1080AVS to the cable and press the TEST switch.  The pattern should remain circular however it may tilt slightly and become oblong due to the capacitance of the cable.  A foreign device will cause one of the patterns to the right to appear.

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