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

[Mark C. Stephens]

Yes that is true in Australia, but one has to prove that it is the utility companies fault.
The main problem is we are right across the street for the main transformer for the area.
So, the start of the 240V run for the whole neighbourhood basically. 
Our switchbox meter has a voltage function that I checked this morning, the voltage is ~255-258V on all 3 phases.
I will give a call to power Co stating this is not no, but I don't like my chances.

Boo..


-marki



-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Ed Palmer
Sent: Sunday, 7 July 2013 9:29 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB LEDS scannning and appears to be reading o/k

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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