| Products > Test Equipment |
| Some old school instruments showing how it's done (HP 3325A and Fluke 8506a) |
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| garrettm:
I think I am running into the some of the same problems as as joeqsmith. First, when using the ! command, I can't seem to get any data back from the meter when entering into HS mode or after I send the ? command. Pretty strange. When using command string S0BT1@<CR> the meter will start sending binary data automatically with 25 to 26ms between measurements (as measured by the scan advance trigger signal). This is roughly 13 times too slow. The serial side of my bus is configured for 8N1 frames and 57600 baud, so it shouldn't be the limiting factor here. Using S0BT@<CR> gives me 32ms between measurements, and is roughly 8 times too slow. I've been using PuTTY while learning to use the instrument remotely and for the above tests. My guess is that this is what's killing my performance. I'll try writing something in python to see if I can get better results. Hopefully I can get the ! command to work while I'm at it. Would be neat to use the meter as a 22bit, 500 samples/s digitizer. Though I'm starting to think that might not pan out. |
| SilverSolder:
I started a separate thread on disassembling the 8080 code in the EPROM, to avoid this thread going too far into outer space: https://www.eevblog.com/forum/microcontrollers/old-school-8080-eprom-disassembly-is-it-making-sense/msg3453512/#msg3453512 I also found "Fluke Application Bulletin 25", it appears to be included in the Artek manual for the 8502A: https://www.ebay.com/itm/FLUKE-8502A-Ops-Service-Manual-App-Note-Options-2/391790405454 An EPROM UV eraser arrived in the post this morning... |
| SilverSolder:
Perhaps someone here knows... How long are you supposed to "bake" an EPROM in the eraser, to erase it? - and how do you verify that it has been correctly erased when you take it out - will it read all zeros? |
| joeqsmith:
From my experience, the more cycles on them the long it can take to erase. The more they were cycled, they were also more prone to dropping bits. The lamp strength will play into it. If you can't erase them after an hour, somethings wrong. Typically they will read FF's. The programmer should have a blank check. |
| SilverSolder:
--- Quote from: joeqsmith on February 10, 2021, 03:03:25 am ---From my experience, the more cycles on them the long it can take to erase. The more they were cycled, they were also more prone to dropping bits. The lamp strength will play into it. If you can't erase them after an hour, somethings wrong. Typically they will read FF's. The programmer should have a blank check. --- End quote --- Is the erasing process cumulative? e.g. erase for 1/2 hour, test, if it wasn't enough bake it a little longer etc.? |
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