Extech Instruments MiniAmp Series User Manual page 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:
Diode Test:
Max Hold:
Digital Display:
Low Battery:
Operating Temperature: 32° to 104°F (0° to 40°C)
Storage Temperature:
Relative Humidity:
Altitude:
Temp. Coefficient:
AC Sensing:
Auto Power Off:
Threshold between 10Ω and 120Ω.
Response time < 100µs
Open circuit voltage < 1.6VDC; Test
current 0.25mA (typical)
Accuracy + 50 digits for changes >
25ms in duration
4000-count LCD display(s); 3 per
second nominal refresh rate
Below approx. 2.4V
-4° to 140°F (-20 to 60
(with battery removed)
o
80% to 88°F (31
linearly to 50% at 104°F (40
Operating below 2000 meters
Nominal 0.15 x specified accuracy per
ºC (between 0 and 18
o
40 C), or as otherwise specified
True RMS on MA420, Average
sensing on MA400, MA440 and
MA460+
After 30 minutes of inactivity
MA Series V2.0 7/02
8
o
C), <80% R.H.
C), decreasing
o
C)
o
C or 28 to