The pictures below show the shielding attached to the inner wall of the instrument cover which provides additional shielding. Mail will not be published required. For an arduino usb to gpib project check this: The cover is grounded through contact with the metal clips on the lower half of the case. The only exception is the Write Enable WE pin, which are located at different positions on each chip.
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Also, the calibration data is device specific so do not attempt to flash your calibration EEPROM with data obtained elsewhere.
Keithley 196 System Digital Multimeter
So I decided to backup the firmware along meithley the calibration data just in case. Of course, you can use pretty much any micro-controllers that you are familiar with as long as TTL logic levels are supported. The only exception is the Write Enable WE pin, which are located at different positions on each chip. December 5, at 9: I bought a used Keithley bench multimeter a few weeks ago.
All these chips are socketed so it is pretty trivial to remove them. The picture below shows the 10V DC voltage reading using a voltage standard. Original theme by srinig. You can download the firmware along with ksithley calibration data using the links at the end.
Kerry D. Wong » Blog Archive » Keithley Firmware/Calibration Data Backup
Hello Kerry, Very interesting page! Keithley Top PCB. The code I used can be downloaded towards the end.
The two EPROM chips where the firmware is stored can be easily identified on the main circuit board marked B17 and B17 respectively. The seemingly excessive shielding is necessary for preventing environmental electromagnetic field interfering with the precision analog circuit. December 3, at 8: According to the service manual, you should only flash the same version of the firmware as keithle is currently on your instrument.
When the chips are right aligned on the breadboard, the lower address pins and data pins will all line up correctly. Home My Youtube Channel About. Leave a Reply Click here to cancel reply. Reply to this comment. December 4, at 7: Any help on what type of coding to use would keithlwy greatly appreciated.
Even with this level of shielding, the manual still suggests placing the meter away from other instruments and interference sources. While the unit I received was last calibrated many years ago, it remained to be well in spec. December 3, at 2: The pinouts of these two chips are quite similar.
Keithley System DMM DIGIT Digital Multimeter Tested | eBay
As far as the local switch goes, the Keithley part number isbut unless you have a donor unit it would be pretty hard to find. Mail will not be keityley required. The pictures below show the shielding attached to the inner wall of the instrument cover which provides additional shielding. Keithley firmware version B17 Keithley calibration data. I am having some trouble getting the two to communicate with each other.
I used an Arduino to keithlet the stored information. December 5, at 5: Since Keithley is considered obsolete by the manufacturer, it might be hard to get a hold of the firmware should the EPROM fail however.
The cover is grounded through contact with the metal clips on the lower half of the case.