| Electronics > Repair |
| ESCORT 97 multimeter - schematics and repair help |
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| perithess:
Thank you very much for your help. I tested on the fly the procedure and calibrate some functions and worked fine. Now I need to setup my calibration equipment to perform a full calibration. Do you know any other functions that you can perform through this calibration menu? Maybe there is a load default setup? Anyway, I can confirm at least the memory chip was bad and the replacement needs reprogramming. Your help is greatly appreciated. |
| shakalnokturn:
I didn't expect to hear from you, thought the multimeter would have been long gone since 2017. Pleased it helped. I'm not aware of any other tweaks in this mode, I haven't really searched though. Looking at service manuals for Escort designed Agilent models may give some hints if there is anything else to be found. I'm curious to know how adjustment goes with a blank EEPROM, considering the DMM gives you an error if there is too much difference between requested and actual input. Im not sure what the requested vales are referenced to: Could be ROM defaults written (or not) to a blank EEPROM, if the reference is meant to be current EEPROM values you may have to write my dump before adjustment. (In any case it could save you time if you first do a performance check as per the Agilent procedures.) I've readjusted the full ACV on mine after replacing an electrolytic in the RMS section, I'll re-dump to get a vague idea of memory organisation. Then if I'm courageous enough I'll give it a blank see if it writes defaults and if that gives me any clues to how it identifies as a 97 or 95. (Were they were a joint venture between Ford and Saab ? ;D) |
| shakalnokturn:
Back to answer most of my previous questions... After giving it a blank EEPROM it will measure, however values are quite off and the decimal is misplaced displaying about 10x the input. Adjustment mode will work just fine, here I grossly calibrated the 4V and 1kV ranges (to get an idea where DCV trims are stored). On exiting, decimal was correctly placed for readjusted ranges, others remained false. I was thinking that the model 95 had more features than the 97, it seems I've been fooled by the table in last attachment that must be wrong. Perithess, you've waited 5 years, now you have no excuse... ;) Attached images: 1st comparison showing where ACV adjustments are stored. 2nd test with blank EEPROM. 3rd miss-leading table? |
| Bobson:
--- Quote from: shakalnokturn on January 25, 2023, 12:31:12 am ---... The big downside for me is that they don't power to their last display settings including 40k count mode. ... --- End quote --- You can switch to HiRes pressing white (shift) button for 2 sec. I consider poor quality of concentric contact rings under function selector to be the worst drawback (had to repair them twice). Being a fan of Escorts I eagerly try to get adjustment procedure docs for Escort 2030 calibrator. |
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