[time-nuts] HP 10544A Repair
Bob Camp
kb8tq at n1k.org
Mon Feb 29 01:10:36 UTC 2016
Hi
Except ….
The big steps give you more “thermal shock” on a BT and that slows things down.
Bob
> On Feb 28, 2016, at 7:28 PM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
>
>
>
> On 2/28/2016 7:01 AM, Bob Camp wrote:
>> Hi
>>
>> It’s not an electrical issue as much as a heat issue ….
>>
>> Before you start, consider that you will be doing something like:
>>
>> Move trimmer 1 turn CW
>> Wait 10 minutes
>> read frequency
>> Move trimmer 1 turn CW
>> wait / read
>> Move trimer 1/2 turn CCW
>> wait / read
>> Move trimmer 1/4 turn CW
>> wait / read
>> Move trimmer 1/8 turn CCW
>> wait / read
>> Move trimmer 1/16 turn CW
>> wait / read
>> Move trimmer 1/32 turn CW
>> wait / read
>>
>> That is indeed an ideal version. You likely will do multiple steps at each of the stages rather
>> than get it right the first time. The part needs to be warmed up for a few days before you
>> can get to the 1/32 turn level. You also need a good standard to compare to.
>>
>> Bob
>>
>
> Instead of that, start with the pot at max temp, and have the counter make measurements at, say, 1 second intervals as the oven warms up.
> You can tell by looking at the plot what the peak frequency is. Now
> that you know the peak frequency you are shooting for, it will take
> a lot less trial and error to find the oven setting that produces it.
>
> Rick
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
More information about the Time-nuts_lists.febo.com
mailing list