| Electronics > Repair |
| ESCORT 97 multimeter - schematics and repair help |
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| perithess:
I didn't understand your post because English is not my mother tongue. I did contact 2 external service places but they charge an arm and a leg. If anyone knows a multimeter that uses the max133 and there is a schematic availiable please post it. |
| texaspyro:
--- Quote from: perithess on December 24, 2017, 08:29:18 am ---I didn't understand your post because English is not my mother tongue. --- End quote --- In the US an "escort service" is where you can hire "women of negotiable affection" for an evening out on the town, etc. They tend to advertise their "services" in rather sleazy newspaper advertisements... there tends to be many pages of their advertisements. |
| HpMad:
This multimeter Escort 99 is the same as keysight 1252a they acquary the company and now is part of keysight, maybe this post is very outdated but i want to comment out anyway. the escort 97 should be agilent 1241a. |
| barijan:
--- Quote from: perithess on December 21, 2017, 09:18:09 am ---...The adc is max133 and CPU is a custom chip 2270 escort 39-25765-1a... --- End quote --- I know it's an old thread, but here's some information that might be useful for the fellow forumers. This "custom" Escort chip is actually a regular Samsung KS57C2016 microcontroller. The actual custom stuff is the firmware, that is pretty obscure. So, there's no use replacing the chip without coding it properly. BTW, Hioki has rebranded this line as well as the Hioki 3800 series (3801, 3801-50 and 3802). Here's the KS57C2016 datasheet. https://www.datasheetarchive.com/pdf/download.php?id=6fc2a8add4ca52193bdab3f5e723d108cccbea&type=O&term=samsung%2520KS57C2016 |
| shakalnokturn:
Adding my brick to this piece of archaeology, there's very little information on them on internet may as well keep things together... I now own 2 of these meters, I consider them very good for their age. The big downside for me is that they don't power to their last display settings including 40k count mode. I have dumped the contents of my EEPROM before fooling around, considering the possibility of gaining model 95 software functions. (Anyone have clues looking at the dump?) After a few hours looking at Agilent service manuals, pushing butons (I don't think Escort 97 is same as Agilent 1241A) I finally found how to get into calibration menu: Turn on to any function while holding "Hz", release "CHEEP" is displayed. Press "PEAK" (Blue/Green) + "DUAL" simultaneously > 1s. Turn selector to function that needs adjustment, DMM displays -rdY- on secondary display, main display prompts for the reference input needed (mostly tens of 3.2 whatever). If only one range in a function needs readjusting set required one by using "RANGE" Oh crap! No 3.2x10^x whatever at hand? Nevermind, one can set a different reference value by using "DH" (Hold) and "REL" keys. Connect required reference then press "DUAL", secondary display displays "CAL0" then some figures (not certain what they are), there's a few seconds delay, if DMM is happy it moves on to next range, if reference is too far from requirements (or DMM at fault) you get a "E-00x" error code. After the highest range secondary display gives you a "PASS", adjustments are written to EEPROM as long as there is no error code even before highest range, no need to go through all the ranges, a single range can be adjusted, then multimeter power-cycled. Mr Kardacz, if your lurking in here please get lost. |
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