[Test-Equipment] Re: Test-Equipment Digest, Vol 41, Issue 5

[jeremy-ca]

Im going by what I was told by an old HP tech. The 141T was designed for the 
8552A IF. When the 8552B came out some would work without a mainframe back 
panel terminator and others wouldnt. My B version died and the replacement 
just gives me a dot on the screen.

I dont have a 141T manual, one is on the way, to see what is on those back 
connectors.

Carl
KM1H


----- Original Message ----- 
From: "Alan Melia" <alan.melia at btinternet.com>
To: <test-equipment at mailman.qth.net>
Sent: Friday, September 07, 2007 3:38 PM
Subject: [Test-Equipment] Re: Test-Equipment Digest, Vol 41, Issue 5


> hi Carl, I am not sure about that, I wouldnt know why that ws necessary.
> However I have had sweep problems that were caused by the -12v 141 frame 
> PSU
> being out of spec. These need to be set up according to the book in the
> correct order as one acts as a reference for the others. The resistors 
> used
> in those days do seem to drift high, and may need replacing if the 
> trim-pots
> with not bring the supply into spec. The -12v rail acts as the reference 
> for
> the schmidt trigger that starts the sweep. First signs are sweep at fast
> speed but no sweep at low speeds.
>
> I hope that helps
> Cheers de Alan G3NYK
>
> ----- Original Message -----
> From: <test-equipment-request at mailman.qth.net>
> To: <test-equipment at mailman.qth.net>
> Sent: 07 September 2007 09:02
> Subject: Test-Equipment Digest, Vol 41, Issue 5
>
>
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>>    1. 141T & 8552B triggering help (jeremy-ca)
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>> Message: 1
>> Date: Thu, 6 Sep 2007 11:59:49 -0400
>> From: "jeremy-ca" <km1h at jeremy.mv.com>
>> Subject: [Test-Equipment] 141T & 8552B triggering help
>> To: <test-equipment at mailman.qth.net>
>> Message-ID: <00b001c7f09e$f7070580$6500a8c0 at KITTYMA123>
>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>> reply-type=original
>>
>> I remember from somewhere that a jumper or termination is needed on some
>> models to start the sweep.
>>
>> Info please??
>>
>> Carl
>> KM1H
>>
>>
>>
>>
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