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-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Friday, February 02, 2007 08:56 PM Pacific Standard Time
To: time-nuts@febo.com
Subject: time-nuts Digest, Vol 31, Issue 10
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Today's Topics:
1. Re: HP10544a Technical Info needed (Dr Bruce Griffiths)
2. Re: HP10544a Technical Info needed (Tom Van Baak (mobile))
3. Re: HP10544a Technical Info needed (Gerald Molenkamp)
4. Re: HP10544a Technical Info needed (Dr Bruce Griffiths)
5. Re: HP10544a Technical Info needed (Dr Bruce Griffiths)
----------------------------------------------------------------------
Message: 1
Date: Sat, 03 Feb 2007 17:01:14 +1300
From: Dr Bruce Griffiths <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] HP10544a Technical Info needed
To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Gerald Molenkamp wrote:
> Hi Howard,
>
> Please find attached a schematic of the 10544, hope it helps in anyway.
>
> Regards
>
>
>
> Gerald
>
Gerald
The connection of the 10K oven monitor resistor R12 in the schematic is
incorrect.
In this position only the very small deviations in the oven supply
voltage due to its finite output impedance will be seen as Q4 turns on
and off.
The resistor should surely be connected to the junction of the
darlington (Q4) emitter and the oven heater winding resistor??
The datasheet clearly states that the duty cycle of the oven monitor
varies, as is seen with working 10544As.
Bruce
------------------------------
Message: 2
Date: Fri, 2 Feb 2007 20:10:53 -0800
From: "Tom Van Baak \(mobile\)" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] HP10544a Technical Info needed
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; format=flowed; charset="Windows-1252";
reply-type=original
> Hi Howard,
>
> Please find attached a schematic of the 10544, hope it helps in anyway.
Wonder where you got that one ;-)
http://www.leapsecond.com/museum/10544/
I scanned and posted that in 2001; but didn't check the
manual against an actual 10544 oscillator. Should be
close enough for a repair, though.
/tvb
http://www.LeapSecond.com
------------------------------
Message: 3
Date: Sat, 3 Feb 2007 15:21:44 +1100
From: "Gerald Molenkamp" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] HP10544a Technical Info needed
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi Bruce,
You are right. I havn't checked my unit against the schematic at all. It is
well secured calibrated and operating in my HP 5342 operating well within
the specifications. The scanned schematic came from Leapsecond a few years
ago, and I have not had to use it as yet. Lets hope it stays that way.
Cheers
Gerald
----- Original Message -----
From: "Dr Bruce Griffiths" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Saturday, February 03, 2007 3:01 PM
Subject: Re: [time-nuts] HP10544a Technical Info needed
> Gerald Molenkamp wrote:
>> Hi Howard,
>>
>> Please find attached a schematic of the 10544, hope it helps in anyway.
>>
>> Regards
>>
>>
>>
>> Gerald
>>
> Gerald
>
> The connection of the 10K oven monitor resistor R12 in the schematic is
> incorrect.
> In this position only the very small deviations in the oven supply
> voltage due to its finite output impedance will be seen as Q4 turns on
> and off.
> The resistor should surely be connected to the junction of the
> darlington (Q4) emitter and the oven heater winding resistor??
> The datasheet clearly states that the duty cycle of the oven monitor
> varies, as is seen with working 10544As.
>
> Bruce
>
> _______________________________________________
> time-nuts mailing list
> time-nuts@febo.com
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
------------------------------
Message: 4
Date: Sat, 03 Feb 2007 17:32:07 +1300
From: Dr Bruce Griffiths <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] HP10544a Technical Info needed
To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Gerald
Its about 30 years since I had one of these apart for (sucessful) repair
without the aid of any circuit diagram.
At least one can calculate that the nominal crystal current is about 240
uA rms somewhat less than the 1mA in the 10811 with its SC cut crystal.
Bruce
Gerald Molenkamp wrote:
> Hi Bruce,
>
> You are right. I havn't checked my unit against the schematic at all. It is
> well secured calibrated and operating in my HP 5342 operating well within
> the specifications. The scanned schematic came from Leapsecond a few years
> ago, and I have not had to use it as yet. Lets hope it stays that way.
>
> Cheers
>
> Gerald
>
------------------------------
Message: 5
Date: Sat, 03 Feb 2007 17:54:45 +1300
From: Dr Bruce Griffiths <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] HP10544a Technical Info needed
To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="iso-8859-1"
Howard
Attached GIf file depicts the recommended power supply filtering when
the oven circuit shares the same supply as the oscillator.
Bruce
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