This document is the user manual of DPM 340 miniature 3.5-digit LED voltmeter. It introduces the characteristics and application scenarios of the product and how to use it.
The DPM 340 is an ultra‑compact, low‑cost LED voltmeter module designed for bright display under all conditions. It features a 0.31" digit height, programmable decimal points, auto‑zero and auto‑polarity, and operates with very low current consumption. The module can be scaled to different full‑scale readings by adding external resistors (Ra and Rb) as shown in the scaling table.
Dimensions are provided for panel cut‑out (2.00 mm) and overall size (38.0 × 18.0 mm) with a maximum panel thickness of 6.00 mm. Pin functions include IN LO, IN HI, RLO, RHI, COM, +5V and decimal‑point pins. The device complies with the Low Voltage Directive and BS EN 61010 safety standards.
| Digit Height | 0.31" |
|---|---|
| Full Scale Reading | 200 mV DC |
| Accuracy | 0.7 % (+1 count) |
| Linearity | 7 count |
| Sample Rate | 3 samples/sec |
| Operating Temperature | 0 – 50 °C |
| Temperature Stability | 150 ppm/°C |
| Supply Voltage | 4.75 – 5.25 V |
| Supply Current | 50 – 65 mA |
| Input Leakage Current | 1 – 10 pA |
The DPM 340 provides a 200 mV DC full‑scale reading.
By adding external scaling resistors Ra and Rb as shown in the scaling table.
It operates from a supply voltage of 4.75 V to 5.25 V.