The SP 300 is a 3½ digit LED digital voltmeter module manufactured by Lascar Electronics. It features a 200mV d.c. full scale reading with auto-zero and auto-polarity. Decimal points are user selectable. The SP 300 features simplified connection and splash proof.
The SP 300 module provides a 200 mV d.c. full‑scale reading with auto‑zero, auto‑polarity and programmable decimal points. Its bright red LED display offers excellent readability in low light, and the panel‑mount design includes a fixing clip and splash‑proof housing for robust installation.
Technical data include accuracy of 0.7 % (±1 count), supply voltage 4.75‑5.25 V, supply current 50 mA, and input leakage as low as 1‑10 pA. The module can be scaled to higher full‑scale voltages using external resistors Ra and Rb, and it supports various measurement configurations such as floating‑supply voltage, single‑ended voltage, and 4‑20 mA current loops. Safety compliance follows the Low Voltage Directive and BS EN 61010.
| Accuracy | 0.7 % (+1 count) |
|---|---|
| Linearity | x1 count |
| Sample rate | 2.5 samples/sec |
| Operating temperature range | 0‑50 °C |
| Warm‑up time | 10 minute |
| Temperature stability | 150 ppm/°C |
| Supply voltage | 4.75‑5.25 V |
| Supply current | 50 mA |
| Input leakage current | 1‑10 pA (Vin = V+) |
The SP 300 provides a 200 mV d.c. full‑scale reading.
Yes, the module is designed to be splash proof.
By adding external resistors Ra and Rb as shown in the scaling table, the full‑scale voltage can be altered.