Sperry DM-370A This group consists of just one meter, a DM-370A from A.W.

I've provided a brief description of the meters in each group and then explained what I liked and didn't like about them. Because of the wide range in meter prices, I divided the meters into five groups. ',' below, explains the issue surrounding DMM colors. One 'feature' not listed in the table but worth noting is the color of the meters and their boots. Lists the price of the units along with some of their features. To see the test results in detail, you can download an with the complete data. A Stanford Research DS335 function generator () provided the 5.2-V and 9-V test signals, and a Tektronix TDS2022 oscilloscope () supplied a view of the test waveforms. A recently calibrated HP 34401A bench DMM (Agilent, ) served as a 'golden' meter for comparison of the handheld units. I looked at the meters for features and usability, and then I measured a 5.2-VDC signal, a 9.9-Vrms triangle wave, and an AC mains voltage with each meter. The models ranged in price from $49.95 to $249. I asked the manufacturers to provide one sample each of their two lowest-priced true-rms DMMs. The differences come down to price, features, and manufacturer's reputation. (' explains why most AC measurements require true-rms meters.) In general, any meter will give you reasonably accurate measurements. With dozens of handheld DMMs on the market, how can you decide which one is right for you? To give you a feel for what's available, I evaluated 18 models from 11 manufacturers, all of which use the true-rms (root-mean-square) method for measuring AC voltage and current. If you make electrical measurements, you probably use a handheld digital multimeter (DMM). Multimeter Protek 506.pdf - Download as PDF File (.pdf), Text File (.txt) or view presentation slides online. ProTek Devices supplies TVS protection, analog and mixed-signal semiconductor products for use in a broad range of electronic equipment and systems.

The down-side to this meter is that it's power hungry and will drain it's 9V battery in about a. I also have the original manual (not pictured). Protek 608 with accessories Here's my Protek 608 with it's carry bag, parrot leads (not original), thermocouple and adapter, RS-232 cable, and RS-232 to USB converter.

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