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53132A bad display

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Robaroni:
It seems to me that the oven options might need the fan on continuously as the oven does draw anywhere up to 200 or 300ma but the simple crystal shouldn't draw more than a few ma. I don't have a schematic so I don't know if the crystal circuit is even powered in the standby position. It might be as the ovens must be power on continuously and it's probably much of the same hardware

My 53132A sits right against the wall with the rear bumpers hitting it, in fact I use a right angle power cord as my bench depth is shallow. What I decided to do is measure the temperature right at the fan with the counter powered on doing measurements and off with just the fan on so I taped a temp prob sitting on the fan output.
I'll do the test for a day and compare the temp to ambient. I'll report back.
Has anyone felt around the power supply or checked its temp in standby? I did a prelim test taking readings and the instrument doesn't seem to get much above ambient at all. I'm wondering if HP just cut a corner to save a couple of bucks leaving it on with the crystal. It just doesn't make sense to me.
Rob

bitseeker:

--- Quote from: uncle_bob on May 21, 2016, 09:35:35 pm ---Probably best to add some sort of time delay in with the turn off. When the fan and the supply both go off at once ... temperature climbs. It doesn't kill the supply fast, but there is a noticeable impact if you look at a couple hundred counters over a decade or so.

--- End quote ---

Ah, good to know. Thanks, Bob.

TheSteve:
I currently use a power bar to turn the power on/off to all of my equipment that keeps an OSC warm. I've noticed very little heat from my 53132A with a properly running fan that is clean. I'm not too worried about turning the power off to it where the fans stops right away.

uncle_bob:

--- Quote from: TheSteve on May 22, 2016, 01:43:38 am ---I currently use a power bar to turn the power on/off to all of my equipment that keeps an OSC warm. I've noticed very little heat from my 53132A with a properly running fan that is clean. I'm not too worried about turning the power off to it where the fans stops right away.

--- End quote ---

Hi

We didn't worry much about it either. Then we started loosing about 4 or 5 supplies a year ....

Bob

Robaroni:
There has to be a reason. When I pull mine apart to change the display board I'll check the temps on the SMPS. If the fan is indeed cooling off the supply I should  be able to see it.
Could it be that your supplies are going for another reason, are you sure it is the fan being off? I've been monitoring the fan all night with the instrument on and then off. I'm just not seeing any great variation in the temp, maybe a degree or two but several variables could be causing it.

I think Gerry's been running for awhile with his mod.

Rob

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