Keithley 196 Firmware/Calibration Data Backup
I bought a used Keithley 196 bench multimeter a few weeks ago. This is a 6 ½ digit 3,030,000 counts meter, capable of measuring voltages down to 100nV and currents as low as 100nA. It can also be used...
View ArticleBackup and Flash Firmware using Arduino
A while ago, I did a tear-down of a Keithley 196 bench multimeter. Towards the end of that post I showed a picture of my breadboard setup for backing up the firmware EPROM (27128) in case I needed to...
View ArticleKeithley 197 Teardown and Repair
A few days ago, I bought a Keithley 197 sold as “unknown working condition” on the cheap. The seller said that some of the keys on the meter were unresponsive. I figured that I’d try fixing it if I...
View ArticleWhen to Use An Electrometer?
Electrometer is a piece of highly specialized electronic test equipment. Most of us would naturally associate it with low-level measurements (e.g. low current pA, fA and high resistance GΩ...
View ArticleTeardown of an Extech 380460 Milliohm Meter
In this blog post, let’s take a look at what’s inside an Extech 380460 miliohm meter. This is a highly specialized instrument, all it does is measuring low ohm range resistance (from 200mΩ to 2000Ω in...
View ArticleTeardown of a Keithley 230 Programmable Four-Quadrant Voltage Source
The latest addition to my lab equipment is a Keithley 230 programmable voltage source which can output up to ±100V. […]
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