->Description  of LOPT/Flyback Tester

This instrument identifies faults in horizontal output stages by doing a 
ring test. That is, it applies pulses to the LOPT / FBT primary circuit, 
and counts the number of damped oscillations or 'rings' produced. For 
each 'ring' down to about 15% of the test pulse amplitude, one LED in 
the bargraph lights up. Nearly all faults will greatly reduce the number 
of rings and give a very low reading.

It can be used on both monitors and TVs because it is not 
frequency-sensitive, and the test signal amplitude is only 650mV, 
low enough to not forward-bias semiconductors in the circuit.

To perform a basic test, connect the test leads between chassis and the HOT collector. If more than 4 LEDs illuminate, the horizontal output stage is probably OK. It can check LOPTs / FBTs out of circuit if broken down components prevent an in-circuit test.

It cannot show up breakdowns which only occur at full operating voltage, and it has no facility for measuring EHT voltages etc.

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