User`s guide

MA Series V2.0 7/02
8
Accuracy Notes: Accuracy is ± (% reading digits + number of
digits), or as otherwise specified, at 23°C ±5°C < 75% R.H.
Model MA420 True RMS accuracies are specified from 10%
to 100% of range or as otherwise specified. Maximum Crest
Factor <1.75:1 at full scale & <3.5:1 at half scale (with
frequency component within the specified frequency
bandwidth for non-sinusoidal waveforms).
Audible Continuity: Threshold between 10 and 120.
Response time < 100µs
Diode Test: Open circuit voltage < 1.6VDC; Test
current 0.25mA (typical)
Max Hold: Accuracy +
50 digits for changes >
25ms in duration
Digital Display: 4000-count LCD display(s); 3 per
second nominal refresh rate
Low Battery: Below approx. 2.4V
Operating Temperature: 32° to 104°F (0° to 40°C)
Storage Temperature: -4° to 140°F (-20 to 60
o
C), <80% R.H.
(with battery removed)
Relative Humidity: 80% to 88°F (31
o
C), decreasing
linearly to 50% at 104°F (40
o
C)
Altitude: Operating below 2000 meters
Temp. Coefficient: Nominal 0.15 x specified accuracy per
ºC (between 0 and 18
o
C or 28 to
40
o
C), or as otherwise specified
AC Sensing: True RMS on MA420, Average
sensing on MA400, MA440 and
MA460+
Auto Power Off: After 30 minutes of inactivity