Products > Test Equipment
Accurate Low Amp Current Probe Advice
Martin72:
--- Quote from: KungFuJosh on November 11, 2024, 04:21:52 am ---I removed and tested the 3 caps from the PSU, and...it seems pointless to replace them. They look new, I don't know if they're original or not. I assume not original, because there was some flux residue on the PCB around them.
Also, the ESR is super low. I can't get anything lower, so what's the point if they're not bad.
Does anybody else have a TM502A they can check the PSU caps in? I'm curious what's normally in there.
Thanks,
Josh
--- End quote ---
The electrolytic capacitors in your power supply have definitely been replaced; I can see that these are (good) hand solderings on the circuit board.
I'll check my 502s to see if they still have the originals installed.
We still have three Tek systems in use at work that are calibrated annually.
But they are quite old, so I contacted Tektronix today to ask if there were any documents for the AM503B module and if we could have them.
They responded promptly and sent me links where I could download the original AM503 circuit diagram, among other things.
There is no circuit diagram for the AM503 B, I could just look at the linked diagram to see if there are similarities between the two versions, was Tek's answer. ;)
KungFuJosh:
--- Quote from: Martin72 on November 12, 2024, 06:48:04 pm ---The electrolytic capacitors in your power supply have definitely been replaced; I can see that these are (good) hand solderings on the circuit board.
--- End quote ---
Even better now that I reinstalled them after testing. 😉😉
--- Quote ---I'll check my 502s to see if they still have the originals installed.
We still have three Tek systems in use at work that are calibrated annually.
But they are quite old, so I contacted Tektronix today to ask if there were any documents for the AM503B module and if we could have them.
They responded promptly and sent me links where I could download the original AM503 circuit diagram, among other things.
There is no circuit diagram for the AM503 B, I could just look at the linked diagram to see if there are similarities between the two versions, was Tek's answer. ;)
--- End quote ---
They're full of shit. There's no way they never had a schematic for the B version.
nctnico:
Well, not for public release. Ofcourse Tektronix has a schematic. But for internal use only.
KungFuJosh:
Of course, but it's still annoying. They supposedly declassified the whole system, but never released the B documents.
KungFuJosh:
--- Quote from: jonpaul on November 12, 2024, 05:53:08 am ---To CAL we use TEK PG506, (or similar,) and wind a 10, 100T magnet wire square loop with a 50 Ohm term R on the loop in series with 50 Ohm on the gen.
--- End quote ---
Hi Jon,
Do you have any of the fixtures they say are needed for cal? I have the connectors to make them myself, but I can't find any info on the feed-thru fixture (015-0670-00) for pre cal degaussing. I'm hoping that it might be the same coding resistor as below, with no other connections, but I have no reference to go with.
The other info was on the tek wiki:
--- Quote ---015-0598-00 Voltage adapter:
It is constructed from a female BNC terminated to pin 'M' on an Amphenol 165-9 or equivalent (Tek Part# 131-1854-00) connector.
The shield of the coax is connected directly to GND pin 'J' or 'K' in the Amphenol connector. There is no connection to the shell of the Amphenol connector.
A 1.13 kΩ coding resistor is connected between pins 'B' and GND (pins 'J' or 'K').
--- End quote ---
Could you please explain your calibration process in detail (with photos)? It sounds like what you do is different than the adjustment kit instructions.
Thanks,
Josh
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