DPM 959B is a 3½ digit LED module with 19mm (0.75“) digit height, programmable decimal points, auto-zero and auto-polarity. It is ideally suited to applications where excellent readability under all lighting conditions is required. The meter is fitted with high efficiency LEDs which, together with the integral red filter, give a high contrast display with 19mm digit height. The meter can be easily scaled by the user to indicate volts, amps or other engineering units and may be used in single-ended,differential,ratio-metricorfloatinginputmodes.
This handbook describes the Lascar DPM 959B 3½‑digit LED module, a compact meter with high‑efficiency LEDs and a 19 mm digit height. It explains how to scale the meter for volts, amps or other units, and details the various input modes (single‑ended, differential, ratio‑metric, floating).
The document includes safety information, dimensional data, pin assignments, on‑board solder‑link configurations, and operating mode instructions. It also provides the electrical specifications needed for proper integration into equipment.
| Digit Height | 19 mm (0.75") |
|---|---|
| Full Scale Reading | 200 mV d.c. |
| Supply Voltage | 4.75 V to 5.25 V |
| Supply Current | 30 mA to 90 mA |
| Maximum Input Voltage | 60 Vdc |
| Operating Temperature Range | 0 °C to 50 °C |
| Warm‑up Time | 10 minutes |
| Temperature Stability | 150 ppm/°C |
| Accuracy (overall error) | ±0.1 % (+1 count) |
| Linearity | ±1 count |
Close the appropriate on‑board solder link (DP1, DP2 or DP3) or connect pins 13‑16 to illuminate the required decimal point.
The input voltage must not exceed 60 Vdc to comply with the Low Voltage Directive.
Fit scaling resistors Ra and Rb as specified and then recalibrate the meter using the calibration potentiometer.
The module operates from a supply voltage of 4.75 V to 5.25 V.