DMU-30ACV series ruggedized true-rms ac voltmeters with daylight readable, auto-dimming LED displays
The DMU-30ACV Series are daylight‑readable, ruggedized true‑RMS AC voltmeters with a 0.56" high‑brightness red LED display and an auto‑dimming circuit for outdoor use. They offer three input ranges (20 Vac, 200 Vac, 300 Vac), a 47‑1 kHz frequency range, and NEMA‑4/IP65 protection for harsh environments.
This manual provides wiring diagrams, technical notes, calibration procedures, and full performance specifications. It also includes mechanical dimensions, ordering information, and panel‑installation guidance for qualified personnel.
| Input Voltage Ranges | 20 Vac, 200 Vac, 300 Vac |
|---|---|
| Input Frequency Range | 47 Hz – 1 kHz |
| Accuracy | ±0.4 %FS ±2 counts (60 Hz sine‑wave) |
| Display Type | Daylight‑readable, auto‑dimming, 3½‑digit red LED, 0.56" |
| Supply Voltage | 85 Vac – 264 Vac (47‑63 Hz) |
| Operating Temperature | -25 °C to +60 °C |
| Weight | 1.3 oz (36 g) nominal |
The meters are offered in three input ranges: 20 Vac, 200 Vac, and 300 Vac.
They provide an accuracy of ±0.4 % full‑scale (±2 counts) with a 60 Hz sine‑wave input.
An auto‑dimming circuit automatically adjusts the LED brightness, and a rear‑mounted potentiometer allows manual minimum‑intensity adjustment.
The enclosure meets NEMA‑4/IP65 standards for moisture and impact resistance.