These three chips are parallel memory chips so it is pretty straight forward to dump the content. December 3, at 8: Mail will not be published required. The picture below shows the 10V DC voltage reading using a voltage standard. The only exception is the Write Enable WE pin, which are located at different positions on each chip. All these chips are socketed so it is pretty trivial to remove them. Keithley Bottom PCB.
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According to the service manual, you should only flash the same version of the firmware as what is currently on your instrument. I used an Arduino to retrieve the stored information. Any help on what type of coding to use would be greatly appreciated.
The pictures below show the shielding attached to the inner wall of the instrument cover which provides additional shielding. While the unit I received was last calibrated many years ago, it remained keithkey be well in keiyhley.
Keithley firmware version B17 Keithley calibration data.
Hello Kerry, Very interesting page! Even with this level of shielding, the manual still suggests placing the meter away from other instruments and keithlley sources. When the chips are right aligned on the breadboard, the lower address pins and data pins will all line up correctly. Keithley Bottom PCB.
Notify me when new comments are added. Since Keithley is considered obsolete by kithley manufacturer, it might be hard to get a hold of the firmware should the EPROM fail however. All these chips are socketed so it is pretty trivial to remove them. The code I used can be downloaded towards the end.
Keithley 196 System DMM 6.5 DIGIT Digital Multimeter Tested
Keithlry seemingly excessive shielding is necessary for preventing environmental electromagnetic field interfering with the precision analog circuit. The top analog circuit board is encased between two pieces of very thick aluminum shielding, and the bottom piece serves as the mounting plate for the analog board as well. The pinouts of these two chips are quite similar. So I decided to backup the firmware along with the calibration data just in case.
The only exception is the Write Enable WE pin, which are located at different positions on each chip. The picture below shows the Keithley with the top cover removed. You can download the firmware along with the calibration data using the links at 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. Keithley Cover Off. December 4, at 7: I bought a used Keithley bench multimeter a few weeks ago.
Kerry D. Wong » Blog Archive » Keithley Firmware/Calibration Data Backup
The cover is grounded through contact with the keuthley clips on the lower half of the case. These three chips are parallel memory chips so it is pretty straight forward to dump the content. Also, the calibration data is device specific so do not attempt to flash your calibration EEPROM with data obtained elsewhere. Home My Youtube Channel About.
I am having some trouble keithlye the two to communicate with each other. Reply to this comment.
December 5, at 9: For an arduino usb to gpib project check this: Of course, you can use pretty much any micro-controllers that you are familiar with as long as TTL logic levels are supported. Original theme by srinig. December 5, at 5: December 3, at 2: