The measurements were from the secondary side of the transformer, the transformer has an 8.8:1 ratio primary:secondary.
In my mind I am assuming that the transformer secondary is providing the pd to drive the current through the scan coils, and when driving the scan coils to get the required deflection, 26 Volts peak to peak is what I am seeing on the scope, actually across the terminals of the scan coils.
In an earlier post it was worked out that the valve would see an inductance around the 4.8 H mark. = 8.8 x 8.8 x 63x10-3. It was also said that the transformer inductance did not come into it because of the square of the ratio!
What I am trying to figure is why the transformer requires double the required DC voltage for the required deflection, which I calculated was 13.6 Volts, sticking back emf in there suggests and extra 5.6 Volts which would only take it to 19.6 Volts so I am still not understanding where I am going wrong in my thoughts.
The primary peak to peak on the scope is showing as 230 Volts and that is as I would expect with the 8.8:1 ratio seeing 26 volts at the secondary.
Adrian
In my mind I am assuming that the transformer secondary is providing the pd to drive the current through the scan coils, and when driving the scan coils to get the required deflection, 26 Volts peak to peak is what I am seeing on the scope, actually across the terminals of the scan coils.
In an earlier post it was worked out that the valve would see an inductance around the 4.8 H mark. = 8.8 x 8.8 x 63x10-3. It was also said that the transformer inductance did not come into it because of the square of the ratio!
What I am trying to figure is why the transformer requires double the required DC voltage for the required deflection, which I calculated was 13.6 Volts, sticking back emf in there suggests and extra 5.6 Volts which would only take it to 19.6 Volts so I am still not understanding where I am going wrong in my thoughts.
The primary peak to peak on the scope is showing as 230 Volts and that is as I would expect with the 8.8:1 ratio seeing 26 volts at the secondary.
Adrian
Learning as I go!
Youtube EF91 Valve
Youtube EF91 Valve
