Tektronix may be known best for their industry-leading oscilloscopes, but they also sell other test equipment, including a line of handheld multimeters in the 1990s.
The model documented here is a DMM912, part of a series of multimeters that included the 912, 914, and 916. All are RMS-responding, 4000/40,000-count models with a number of premium features like min/max/average, auto-hold, peak-hold, AC+DC, lead warning, and memory storage. The display updates 4/sec in 4000-count mode or 1/sec in 40,000-count mode. Accuracy and bandwidth increases with each model; this 912 is rated at 0.2% basic DC accuracy and a bandwidth of 1kHz. The 914 and 916 make use of a secondary numeric display for simultaneous ACV and Hz readings, the 912 does not.
This unit arrives in good functional condition, needing no repairs other than a fresh 9V battery and a general cleaning. The LCD lens has some spots that cannot be removed, but fortunately they do not obscure the display too much, despite the fact that the contrast is a bit on the low side. Let’s take a look at how it’s made!
DMMCheck calibration check results for this Tek DMM912 [in 40,000-count mode]:
|Ohms||100Ω||99.74||REL feature used|
Update: It was speculated in the comments below that this meter was made by Brymen, but evidence is a little stronger that it may instead be manufactured by APPA Technology, another Taiwanese company. The internals (switch, buttons, etc.) bear an uncanny resemblance to the APPA 100-series multimeters. See this teardown of an Iso-Tech 105 as an example.