This document is the specification of DPM 490 4½ Digit LED Panel Meter. It introduces the features and characteristics of the product, including accuracy, resolution, measurement range, power supply, supply current, input leakage current, temperature range, etc.
The DPM 490 is a high‑performance LED panel meter with a 10 mm (0.39 in) digit height display housed in a robust DIN case. It offers auto‑zero, auto‑polarity, selectable decimal points, and DIP‑switch configuration for various operating modes.
The manual details the meter's physical dimensions, snap‑in panel mounting, optional screw‑terminal connector, scaling resistor adjustments, and safety requirements. Wiring pin functions, DIP‑switch settings, and supply specifications are also covered to aid installation and integration.
| Digit Height | 10 mm (0.39 in) |
|---|---|
| Full Scale Reading | 2 V DC |
| Resolution | 0.07 mV |
| Sample Rate | 2.5 samples/sec |
| Operating Temperature Range | 0 °C to 50 °C |
| Temperature Stability | 30 ppm/°C |
| Supply Voltage | 5 V – 5.5 V DC |
| Supply Current | 720 – 200 mA |
| Input Leakage Current | 1 – 10 pA |
| Accuracy | 0.005 % – 0.01 % (+1 count) |
The display uses a 10 mm (0.39 in) LED digit height.
Two scaling resistors (Ra and Rb) can be fitted to alter the meter’s full‑scale reading.
The meter operates from a 5 V to 5.5 V DC supply.