I used an Arduino to retrieve the stored information. The picture below shows the Keithley with the top cover removed. December 3, at 8: 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. Original theme by srinig. Hello Kerry, Very interesting page!
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System DMM 196
The pinouts of these two chips are quite similar. The two EPROM chips where the firmware is stored can be easily identified on the main circuit board marked B17 and B17 respectively. So I decided to backup the firmware along with the calibration data just in case.
I am having some trouble getting the two to communicate with each keithey. The code I used can be downloaded towards the end. The pictures below show the shielding attached to the inner wall of the instrument cover which provides additional shielding.
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I bought a used Keithley bench multimeter a few weeks ago. Also, the calibration data is device specific so do not attempt to keithleey your calibration EEPROM with data obtained elsewhere.
Any help on what type of coding to use would be greatly appreciated. Both and can be read using the same circuit setup.
The seemingly excessive shielding is necessary for preventing environmental electromagnetic field interfering with the precision analog circuit.
December 5, at 5: All these chips are socketed so it is pretty trivial to remove them. December 3, at 8: The cover is grounded through contact keitlhey the metal clips on the lower half of the case. Keithley firmware version B17 Keithley calibration data. December 3, at 2: While the unit I received was last calibrated many years ago, it remained to be well in spec.
According to the service manual, you should only flash the same version of the firmware as what is currently on your instrument. 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.
Keithley Bottom PCB. December 4, at 7: I used an Arduino to retrieve the stored information. 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. You can download the firmware along with the calibration data using the links at the end. Keithley Top PCB. The picture below shows the Keithley with the top cover removed.
When the chips are right aligned on the breadboard, the lower address pins and data pins will all line up correctly. The only exception is the Write Enable WE pin, which are located at different positions on each chip.
For an arduino usb to gpib project check this: The picture below shows the 10V DC voltage reading using a voltage standard.
December 5, at 9: Mail will not be published required.
Even with this level of shielding, the manual still suggests placing the meter away from other instruments and interference sources. These three chips are parallel memory chips so it is pretty straight forward to dump the content.