Monthly Archives: February 2013

HP 3468A Bench Multimeter Repair

Posted on February 23, 2013 by modemhead

Hewlett-Packard has built a reputation for quality bench multimeters every bit as impressive as Fluke has for the handheld variety. Nowadays they’re called Agilent, but this unit has the HP nameplate on it, and date codes on the parts inside … Continue reading →

Posted in Repair, Teardown | Tagged , | 22 Comments

Beckman 3020 DMM Repair

Posted on February 15, 2013 by modemhead

Handheld digital multimeters were just beginning to gain popularity in the late 1970s.  Fluke was there of course, but so was Beckman.  This is a Beckman 3020 3½-digit 2000-count model that dates to 1979.  It has the classic Beckman ‘look’ … Continue reading →

Posted in Repair | Tagged , | 49 Comments

DMM Basics – Dual-Slope ADC

Posted on February 8, 2013 by modemhead

This is the first in a series of posts looking at how a digital multimeter actually works.  First a little theory, then later we’ll look at the ubiquitous ICL7106 that basically started the ball rolling on handheld DMMs back in … Continue reading →

Posted in Theory | Tagged | 7 Comments