Re: FG 504 function generator odd behaviour
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Colin Herbert
Oops! I have checked the voltages and while the +25V (+24.99), +15V (+14.98)
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and -15V (-14.98) are just about bang on, the -25V is sitting at -3.58V. I really can't remember if this was the case when I checked previously, but it is now. I did manage to short something out with the DMM probes, so that may have given this problem, but sure as sure it needs to be fixed, but how? Colin.
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dave Daniel Sent: 10 July 2020 18:13 To: TekScopes@groups.io Subject: Re: [TekScopes] FG 504 function generator odd behaviour The first thing to do is measure the power rails to make sure that the voltages are in spec and clean. DaveD On Jul 10, 2020, at 13:04, Colin Herbert via groups.io<colingherbert=blueyonder.co.uk@groups.io> wrote: shows asymmetry in that the negative peaks of the wave are rounded-off at any frequency and the positive ones have a similar but lesser problem at higher frequencies. This also seems to manifest itself as what looks like cut-off on the negative peaks of the sine-wave and lesser cut-off on positive peaks. While the triangle-waves are more-or-less symmetrical, the sine-waves are definitely not so, showing a nearly three-to-one voltage ratio in favour of positive peaks. There is also noticeably overshoot on the square-waves at anything above 1kHz and only a DC offset at frequencies below 80Hz. I am totally ignorant of how this function generator producestriangle-waves, but I do understand that the square-waves and sine-waves are derived from the triangle-wave. Does anyone have any help that they can offer? I would be grateful to get this useful function-generator working properly. Colin.
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