| Electronics > Repair |
| ESCORT 97 multimeter - schematics and repair help |
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| perithess:
Hello everyone, I own quite a few years now an ESCORT 97 multimeter (sounds like car name) and also the company that I am working owns a dozen of ESCORT 97s, about ten ESCORT 98s and a couple of ESCORT 99s. All of them have been great and accurate multimeters for the time and we mostly use them for data logging. They were very reliable the last decade of use and they are usually pass the annual calibration verification with very good measurements. But the last two yeas my private ESCORT 97 and a couple of 97s at work failed. I am trying to find out any schematics or service information in order to repair them. Can anyone help me to repair this multimeters? |
| lowimpedance:
In what way has it failed ?. Which measurements and/or Ranges or its completely dead. More detail including internal pictures which might give a clue to the chip set used and thus a data sheet may exist which will most likely be more possible than finding a schematic. This is generally the case with these old Escort meters. |
| perithess:
--- Quote from: lowimpedance on December 16, 2017, 12:07:04 pm ---In what way has it failed ?. Which measurements and/or Ranges or its completely dead. More detail including internal pictures which might give a clue to the chip set used and thus a data sheet may exist which will most likely be more possible than finding a schematic. This is generally the case with these old Escort meters. --- End quote --- My multimeter had an intermittent failure to start. One of my colleagues poked it and burned the regulator stages. According to my assumption there are two negative regulators which make the 9v +5v and -5v and I replaced them with nju7211u50 and now is power up ok. But the measurements are multiplied by 10. When I am measuring 10v it shows 100v on the screen. In mV overanges on the x10 value also. Apart from that I haven't test it more. I have tried to repair it by replacing all the chips on analog board. The adc is the max131 and the CPU is an escort part. I will upload photos later. |
| Electro Detective:
I still have an older Escort, my first decent TRMS meter and still kicking strong :clap: I think Escort are now owned by Keysight and some of the Escort meters are rebadged as Keysight and painted ORANGE Perhaps Keysight may have some service docs ? :-// Good luck with it :-+ |
| lowimpedance:
Can you set a manual range and have the decimal point display in the correct position then apply the 10V and see if the meter overloads or what value is displayed. |
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