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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.
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 |
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Polarity | Auto with “-” indication, “+” indication implied |
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POWER REQUIREMENTS | |
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 |
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ACCURACY @ 25°C | 3 1/2 digit: ± (0.1% of reading + 1 count) |
| 4 1/2 digit: ± (0.04% of reading + 1 count) |
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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 |
Temperature Coefficient | (All inputs) ± (0.02% of input ± 0.2 digit) / °C |
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NOISE REJECTION | |
NMRR | 60dB, 50/60 Hz |
CMRR | (with 1KΩ unbalanced @ 60Hz) 90dB min |
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A TO D CONVERSION | |
Technique | Integrating |
Rate | 3 samples/second-typical |
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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) |
Case Material | 94-VO, UL-rated ABS |