Products > Test Equipment
Counting on the HP 5328B
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jrharley:
Hmmmnnn..... trying a couple more. SHIELDED-C.pdf (242.21 kB - downloaded 25 times.)

Even though files are small, only allowing 1 at a time.
Tony_G:
Good to see that you are making progress - As an aside, to post pictures here I created an Imgur.com account and then just use their BBCode links to include the image and thus there are no attachment limitations:



Look forward to seeing the next update...

TonyG
jrharley:
Thanks for the tip TG!
Imgur is a pretty disorienting platform to an old guy like me, you know, with all the photo memes and stuff. I'll consider if it makes sense to upload that way for me. Still, it shouldn't be tricky, as a matter of practicality, to upload a couple pics to this thread. I should go back and read some forum guidelines to make sure I'm not doing something stupid.

Meanwhile, I'm deep into studying this beast and learning what I can. Attached photo shows a necessary step.

As always, I really appreciate you chiming in!  :-+
jrharley:
HP5328B update 'yall, Happy 4th! –

Well, I’ve moved on to the A12 Amplifier board. My limbic dominated brain, reasoned that since that’s where the input jacks connected into the circuit, I should dial down on that board.

Interestingly, I began to notice that a large number of the solder joints, mostly on the topside, looked kinda’ dodgy. The microscope confirmed that. Don’t know if any of them are contributing to not displaying the input frequency yet, but I figure they should be touched up. Unfortunately, during this close observation, I saw a stomach churning flaw in relay K5. The sucker is pretty badly cracked on one end. I don’t know too much about these reed relays, but I’m pretty sure a big split in one end is not a good thing. The coil is apparently 5V, so maybe I can devise a way to test if it’s working using a DC power supply and ohm’ing it out. I sure hope I can determine that it's working, because initial research says it’s not going to be easy to replace.  :palm:

Photo of A12 attached. - JRH
Tony_G:
Quick poke around seems to show that this is a replacement part - Not saying it is but just what the InterWebs seems to point at - Might be worth looking at the datasheet etc...

https://www.littelfuse.com/products/magnetic-sensors-and-reed-switches/reed-relays/he700/he721c12.aspx

There is a 5V version on Digikey here:

https://www.digikey.com/en/products/detail/littelfuse-inc/HE721C0500/133219

Again, not sure it is actually a replacement but might work or lead you to the right part - Good luck.

TonyG
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