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From: Spehro Pefhany
Subject: Re: Displaying ELF On a 'Scope
X-Newsreader: Forte Agent 1.92/32.572
Date: Sat, 21 Dec 2002 01:29:16 GMT
NNTP-Posting-Date: Fri, 20 Dec 2002 20:29:16 EST
On Sat, 21 Dec 2002 12:28:15 +1100, the renowned "Phil Allison"
>"Ron Hubbard" wrote in message
>> I have an old 10 MHz Heathkit oscilloscope that works okay at the very
>> end, but on the very low end- say 1 Hz to 300 Hz - when I try to display a
>> sine wave all I get is a section of it; I can't even tell if it's a pure
>> sine or there's distortion. Anyone have any suggestions for getting a
>> and complete display of very low frequencies?
> ** Most scopes have sweep speeds down to 100mS or 1 S per div.
> Is your Heathkit a normal scope or a HF waveform monitor ??
> Have you got the horizontal magnifier ( x10 boost) on ?
> Is the sweep oscillator faulty ?
I recall the REALLY REALLY old Heathkit scopes (tubes, more like 1MHz,
IIRC), were AC coupled and had some strangeness with the trigger
circuit at some extremes (probably they were feeding the vertical
signal into the sweep oscillator in some way).
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