Products > Test Equipment
Keithley 197A owners' corner
Brian of Romsey:
Rasto,
I agree on the price of things for an in-case solution. Perhaps an out-of-case solution would work with some sort of new display, probably a 3.5" TFT LCD in a little case with a cable to the 197A. Portrait mode, status indicators at the top, big numerical value right across with units at the right, and then maybe an analogue 'meter' at the bottom.
https://www.aliexpress.com/item/32609807497.html?spm=a2g0o.productlist.0.0.1b7a5e359o85W8&algo_pvid=6e1ec20b-de25-421a-91cc-a95b11ceb965&algo_expid=6e1ec20b-de25-421a-91cc-a95b11ceb965-6&btsid=42aa5706-d76b-47e8-9567-bc3062ca7320&ws_ab_test=searchweb0_0%2Csearchweb201602_6%2Csearchweb201603_52
The other (remote) possibility for the in-case solution is whether a couple of these:
https://www.aliexpress.com/item/32801200578.html?spm=a2g0o.productlist.0.0.5e9b3b27Vdioca&s=p
could be brought close enough together horizontally and made to work.
Cheers, Brian.
rastro:
Maybe extend the out-of-case-display concept using an ESP8266/ESP32 to extract the readings/status from the K197 and use the WIFI to access a simple server on the module displaying the DMM data. Then you have an unlimited choice of WIFI connected displays (phone/tablet/PC). I think you can get an ESP8266 for under $5.00.
I'm not an expert on the ESP's but it seems feasible according to other projects I have seen using these modules.
rastro
Brian of Romsey:
Hi,
The idea of Wi-Fi or Bluetooth and an ESP had occurred to me. I hadn't thought of an internal webserver to be honest.
I am aware that there are existing (modern) DMMs and such like that do some sort of BT protocol for remote displays. Given how much trouble Dave reported getting the BT thing working with his recent DMM I figured that that was a path to a whole heap of pain.
Cheers, Brian.
Brian of Romsey:
Hi,
Found a possible SPI OLED display: https://www.aliexpress.com/item/32988174566.html
With a resolution of 256 by 64 that would be sufficient for sign, value, & units in the top third of the display and all the rest of the possible status bits and bobs along the bottom third.
Cheers, Brian.
Brian of Romsey:
Hi,
This is an instrument display replacement strategy. It may be instructive for a 197 or 197A display replacement.
Brian.
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