[time-nuts] HP 115BR Clock Repaired and Ready to go
brooke at pacific.net
Tue Oct 16 15:31:55 EDT 2012
I'd characterize the noise as obnoxious to the point I could not have my 113AR in the house, but only the garage.
Chuck Harris wrote:
> I found that a lot of the 1KHz noise on mine was caused
> by a bad ball bearing in the motor. I replaced it with
> a new bearing and the 1KHz was then only loud.
> It isn't the motor, it is the 1KHz drive. Airplanes
> with 400Hz 3 phase motors in the instrumentation are
> similarly loud.
> -Chuck Harris
> Bill Hawkins wrote:
>> Had some interesting times with the HP-113B clock, but had to
>> mount it in an insulated cabinet with an insulated door because
>> it made so much 1 KHz mechanical noise. No wonder the housing
>> for the assembly is so heavy.
>> Did they find a quieter motor for the 115B?
>> Bill Hawkins
>> -----Original Message-----
>> From: George Race
>> Sent: Monday, October 15, 2012 2:57 PM
>> To: 'Discussion of precise time and frequency measurement'
>> Subject: [time-nuts] HP 115BR Clock Repaired and Ready to go
>> I still have the HP 115BR Clock. It is fully repaired and fully functional.
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