DEC VT101

Unofrtunately DC resistance measurments on a flyback transformer tell you very little. A single shorted turn in that winding will not change the DC resistnace enough to see. A shorted turn in anotehr windign will not change the resistance at all. But either will extract enough energy to prevent the flyback from resonating, will cause the primary currnet to go very high and will damage the output transistor. The only useful test is a ringing test. Basically, you resonate the widnidng with a capacitor 9arounf 100nF IIRC), then apply pulses to it (the nromal way is a nopen-collect drier using a BU406 or similar trasnsitor) and look at the waveform on a 'scope. A good flyback will show many osciallations before they decay to 'invisible', a bad one will probably not oscillate at all. -tony