[time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB LEDS scannning and appears to be reading o/k

Ed Palmer ed_palmer at sasktel.net
Sat Jul 6 19:28:46 EDT 2013


Check with your power company.  They may be able to switch taps on the 
transformer to reduce the voltage.  I don't know what the situation is 
for you, but in some places power companies can be forced to 
repair/replace equipment that they fry due to faults in their system.

Ed

On 7/6/2013 5:14 PM, Mark C. Stephens wrote:
> I just checked the HP manual, most of the linear equipment is specified: 240V +5/-10%
> So, I am a little over at 258V here ):
> I am going to unplug everything until I can get this sorted out.
> Can't afford to lose anything more, in both time and spares obtainability.
>
>
> marki
>
>
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Jim Lux
> Sent: Sunday, 7 July 2013 8:01 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB LEDS scannning and appears to be reading o/k
>
> On 7/6/13 2:46 PM, Mark C. Stephens wrote:
>> Hopefully HP Voltage "Derated" the Cap as well  so it can handle our
>> 250V here.. We are across the road from the main transformer for the
>> area so the voltage is highest at our place, I checked the meter box
>> this morning - it is 255-258V on all 3 phases, no wonder I am having
>> problems.
>>
>
> Is that nominally 240 phase to neutral/ 415 phase to phase.  typically, the utility is allowed 10% tolerance.. I see that wikipedia says AS60038 calls out 230V +10% -6% so that's 253 to 216
>
> One thing to be wary of is that the utility supplies voltages at, say, 120V or 240V (in the US), but utilization equipment (motors, for
> instance) is labeled as 115V or 230V.  This accounts for the 2% voltage drop in the branch circuit, among other things.


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