The Simpson Mini DC Current Indicators provide high quality, accuracy, and reliability in a compact 12mm deep case. M135 has a 3-1/2 digit, 0.5” LCD display and is available with a negative image, bright red backlight option. Mini M135s feature user-selectable decimal point and display hold.
Three power supply choices are available, and a low battery indication is provided for 9VDC battery applications. Mini units feature a standard 3/64 DIN high-impact plastic case. The standard LCD units have a clear viewing window. The units with optional negative image, bright red backlighting, have a red window.
Specifications
DISPLAY
Type
7- segment LCD
Height
0.5” (12.7mm)
Decimal Point Position
User-Selectable
Overrange Indication
Most significant = “1” other digits blank
Backlighting
Optional negative image, red backlighting at
5, 10. 12, 24 or 48 DCV
Polarity
Auto with “-” indication, “+” indication implied
POWERREQUIREMENTS
DC Power
±5V, +5V and +9V
Low Power Indication included with 9V units
Power supply current
2mA max
Backlight supply current
50mA typical
For 24 and 48 DCV, 10mA typical
ACCURACY@ 25°C
3 1/2 digit: ± (0.1% of reading + 1 count)
4 1/2 digit: ± (0.04% of reading + 1 count)
ENVIRONMENTAL
Operating Temperature
0 to 55ºC
Storage Temperature
-10 to 60°C
Relative Humidity
0 to 85° non-condensing @ 40°C
Warmup time
Less than 20 minutes
TemperatureCoefficient
(All inputs)
± (0.02% of input ± 0.2 digit) / °C
NOISE REJECTION
NMRR
60dB, 50/60 Hz
CMRR
(with 1KΩ unbalanced @ 60Hz) 90dB min
A TO D CONVERSION
Technique
Integrating
Rate
3 samples/second-typical
MECHANICAL
Bezel
0.94” x 2.83”
Depth
0.43”
Panel cutout
0.89” x 2.71” (22.6 mm x 68.8 mm)
Weight
1.0 oz. (28.3 g)
CaseMaterial
94-VO, UL-rated ABS
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