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Auto-ranged digital meter A fully auto-ranged digital meter that checks capacitors and inductors for value and ability to perform in-circuit has been introduced by Sencore. The Z meter LC53 checks capacitor values from 1pF to 200,000pF to 1% accuracy and inductor values are checked from 1 uH to 10 H to 2% accuracy. A dynamic capacitor leakage test measures capacitor current leakage to 10,000µA, with applied voltage in 12 steps from 3V to 600V, detecting leaky capacitors that cannot be found with an ohmmeter. Inductors are checked for quality by a dynamic ringing test that strikes the coil and measures the number of times the coil rings before decaying to 25%. The LC53 markets for $695. Two 3 1/2 DMMs Two 3 1/4 DMMs from VIZ provide an accuracy of .1% with an input impedance of 10m-ohm according to the company. The LCD model, WD-759, offers visual indication of function in the display window as well as the measurement value. The suggested price is $159. The LED model, WD-758 is identical in electrical performance except that it doesn't provide function indication in the display. Measurement ranges for both are from 100pV to 1000Vdc and up to 600Vac; from .1 ohm to 20m ohm and from .1µA to 1A, do and ac. Price is $149. Portable DMM A. portable DMM has just been announced by B&K-Precision. Model 2815 is a compact instrument that is shielded against RF interference. It retains accuracy in RF fields so it can be used near 2 -way radios or broadcast transmitters up to 450MHz. This new design features high resolution, excellent overload protection and 0.1% dc accuracy. A major feature is its protection against accidental overloads on all ranges. The ohms range will resist damage from momentary overloads up to 1000V dc or ac peak. Continuous ohms protection is +1000Vdc and -450Vdc or 350VAC. Also see: Reports from the test lab |
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