Out in Front: May 9, 1996
Among the features of the DMM800 line is a dual display that lets you, for example, simultaneously read an ac waveform's rms voltage and frequency. All members of the family, even the lowest priced unit, the $199 DMM830, let you choose a full-scale resolution of ±4000 counts (33/4 digits) or ±40,000 counts (43/4 digits). All units meet IEC, UL, and CSA safety standards. All measure true-rms ac values and, unlike most other handheld DMMs, offer a true-rms ac+dc function. The $289, top-of-the-line DMM870 measures capacitance from 4000 pF to 4000 µF and ac or dc current from 400 µA to 10A. With the aid of a thermocouple probe, this unit also measures temperature in Celsius or Fahrenheit with a maximum error of ±2°C. The unit's basic dc voltage error is ±0.06% of reading plus 10 counts (in the 40,000-count mode). The DMM870 and the $249 DMM850 also perform high/low limit tests and have a time-stamp function that indicates how long a test had been running when the meter acquired the highest and lowest readings.
Besides the DMMs, Tek's handheld digital-meter line now also includes a temperature meter, several clamp-on ac ammeters, and a full line of probes and accessories.
by Dan Strassberg
Fluke Corp, Everett, WA. (800) 873-5853.
Tektronix Inc, Beaverton, OR. (800) 479-4490.