[time-nuts] HP 5370A temp

[gbusg]

I think 61°C might be more typical, so 76°C seems pretty darn hot to me. I 
would make sure that your fan is running, and is mounted the right 
direction. (It should be blowing *into* the instrument.)

Also make sure that the top instrument cover is installed. (The top cover 
must be in place so that the internal fan air currents will loop around and 
pass through vents, including the through-holes in the rear heat sink.)

Greg

----- Original Message ----- 
From: "gonzo ." <cadbloke at hotmail.com>
To: "time-nuts" <time-nuts at febo.com>
Sent: Monday, February 07, 2011 9:28 AM
Subject: [time-nuts] HP 5370A temp



Hi all,
I just picked up an irresistibly cheap 5370A (so cheap I didn't ask if it 
worked).
So far it checks out ok, but I have some questions for those of you more 
familiar with this model.

1) The back panel heatsink (4x TO3) is sitting on 76°C  (168°F).
- is this normal?

2) Several resistors and diodes on the A6 Power Supply Controller show sign 
of excessive heat (specifically: CR1, R1 & R23).
All the A6 voltage rails are within 0.2V.
- Is this a normal sign of age or should I be looking for something that's 
NQR?

Judging by the stickers, it's probably spent it's entire life with the side 
panels on the wrong sides.This may help explain the overheated components.

cheers,
ian

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