Be careful, now. What you are seeing are the frequency limitations due to the yoke
inductance versus amount of drive voltage available. The amplifier has to have a
fast slew rate to get the beam to deflect quickly.
For example let's say we need to move the beam from the center to a couple of inches
up to start a line draw. The amplifier has to swing hard and fast to the rail in
order to get the yoke to change current quickly, THEN it has to recover quickly and
precisely so the current doesn't overshoot or undershoot. If we didn't need the
slew rate I'd be tempted to just put an LM12CLK in there and have a one-chip
solution. Hmmm....anyone care to try one of those and see if it will work? Maybe
it will be fast enough.
Anyway, if you really want to measure the response of the amplifier, try it into a
resistive load (not the yoke).
Mendel Pearl wrote:
> I have done a simple test too see what maximum frequency the WG6100 amplifiers
> can operate until they start to phase shift or decay.
> I connected a sine generator to both inputs and input a 8V t/t wave, so the
> display showed a straight, 45 degree slanted line.
> When I increased the freqency, the display started to distort at about 5Khz.
> (the straight line became more circular).
> At 10 kHz it was almost a full circle (90 degree phase shift).
>
> Does this mean it is not nessesary to create an amp which can amplify signals up
> to 100kHz since the original seems to fail at 5kHz?
>
> Just my 2 cents.
> Cya!
Received on Fri Nov 5 14:02:28 1999
This archive was generated by hypermail 2.1.8 : Fri Aug 01 2003 - 00:32:27 EDT