Hi Douglas,
I have no experience with this beast but to draw this sort of current
it points to a possible bypass cap short. If there are any dipped
tants in there, there is a high possibility that one or more of them
have gone short. If you have a good 4-wire ohm meter and a kelvin
probe, just che
Hal Murray wrote:
[variac]
If you don't have one, you can wire a light bulb in series with the
power cord. Use 40,60,100 watt - whatever you need.
Neat. Thanks. That trick wasn't on my list.
I think you can get lower wattage bulbs (at 120V). I think I've seen 25W,
but I'm not su
12:50 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 5328 PSU nightmare... Or stupid engineer,
you decide...
[variac]
> If you don't have one, you can wire a light bulb in series with the
> power cord. Use 40,60,100 watt - whatever you need.
Ne
Hi,
I use a Variac routinely to turn on instruments that have been unused
for more than a few months.
Electrolytic capacitors will often come good if slowly brought up to
voltage.
Recently I resurrected a WW2 "Command" receiver that had been stored
for 40 years.
I hooked up a power supply an
[variac]
> If you don't have one, you can wire a light bulb in series with the
> power cord. Use 40,60,100 watt - whatever you need.
Neat. Thanks. That trick wasn't on my list.
I think you can get lower wattage bulbs (at 120V). I think I've seen 25W,
but I'm not sure. Old style tungsten ni
Probably 90% of power supply overload problems are shorted dipped tantalum
caps. Start there... check the resistance across each supply. The other 90%
are shorted pass transistors/base drivers and/or zener diodes.
You mentioned that you have more than one of these units. Compare reading
Hi Dave,
I think we've all lost some hair while working on a stubborn problem.
Hang in there.
As mentioned by Brent Gordon, the Variac is your friend in situations
like this. If you don't have one, you can wire a light bulb in series
with the power cord. Use 40,60,100 watt - whatever you need. Th
I'm not familiar with this particular instrument, but a standard
technique for linear power supplies is to hook it up to a variac. This
lets you turn down the line voltage so you can do some measurements
without smoking the system.
Brent
Douglas Wire - PUPCo Studios wrote:
Good day everyone an
Neither the linear regulators nor the switching regulators in the 5328A have
any explicit current limiting circuitry other than that provided by the
pass transistor current gain and the limited current available from the
pass element driver.
The only protection against long term load faults is pro
I'm not familiar with this particular instrument, but a standard
technique for linear power supplies is to hook it up to a variac. This
lets you turn down the line voltage so you can do some measurements
without smoking the system.
Brent
Douglas Wire - PUPCo Studios wrote:
> Good day everyone and
Douglas,
there are lots of folks out there that are much more familiar with the
5328A, but here is what I think about it at a first glance.
If F1 blows quickly, there is a serious overload / short situation.
Don't try fixing by swapping fuses.
If you can't measure a short (that would be the firs
Good day everyone and thank you all for hosting this wonderful community
and allowing me to participate. I have several HP5328 with the “really-
nice” newer 10811-x Oscillators in them. I have found while I have
used the good old gold trace reliable HP instruments all of my life, these
units ha
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