The document introduces a compact LCD meter, ideally suited to low or high volume applications. The meter has a 28 pin DIL integrated circuit format and can be plugged directly into a DIL socket or panel mounted using the snap-in bezel provided. The low profile bezel incorporates a flat reverse printed window, giving a superb appearance that cannot be damaged or removed by contact. The meter has an accuracy of 0.05% (overall error), linearity of ±1 count, sample rate of 3 samples/sec, operating temperature range of 0-50°C, supply voltage of 7-14V, low battery threshold of 7.5V, supply current of 150A, and input leakage current of 1-10pA. It needs to be re-calibrated periodically to ensure maximum accuracy.
The DPM 400 is a compact 3‑digit LCD module designed for low‑ or high‑volume applications. It mounts in a 28‑pin DIL socket or panel using a snap‑in bezel and features programmable decimal points, auto‑zero, auto‑polarity, and annunciators.
The manual covers electrical specifications, pin assignments, panel fitting, safety compliance with the Low Voltage Directive, and various operating modes. It also explains scaling resistors, connector sourcing, and how to use the on‑board links for different measurement configurations.
| Supply voltage (V+ to V-) | 7‑14 V |
|---|---|
| Low battery threshold | 7.5 V |
| Sample rate | 3 samples/sec |
| Operating temperature range | 0‑50 °C |
| Temperature stability | 100 ppm/°C |
| Accuracy (overall error) | 0.05 % ± 1 count |
| Supply current | 150 pA |
The module operates from 7 V to 14 V (V+ to V-).
The low‑battery warning triggers at 7.5 V.
It samples at a rate of 3 samples per second.
The device can be used from 0 °C to 50 °C.