Norma DM950
| Status | planned |
|---|---|
| Counts | 21000 |
| IEC 61010-1 | - |
| Connectivity | Proprietary 5-pin cable |
| Measurements | voltage, current, resistance, capacitance, temperature, diode, continuity |
| Features | autorange, data hold, bargraph, backlight |
The LEM Norma DM9x0 Series of multimeters are 21000 count CAT II/CAT III hand multimeters with optional RS232 connectivity. The models differ by precision and feature set.
They were also sold as OEM devices by Siemens.
Models
| Model | Siemens OEM | Precision (DC) | Backlight | RMS | TRMS | R 20 MΩ | R 200 MΩ | U AC 1 kΩ/V | I 10A | f | C |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Norma DM910 | B1024 | ±(0.5% +2d) | ● | ● | |||||||
| Norma DM920 | B1025 | ±(0.5% +2d) | ● | ● | ● | ||||||
| Norma DM930 | B1026 | ±(0.3% +3d/+2d) | ● | ● | ● | ● | ● | ● | ● | ||
| Norma DM940 | B1027 | ±(0.1% +3d/+2d) | ● | ● | ● ? | ● | ● | ● | ● | ● | |
| Norma DM950 | B1028 | ±(0.06% +3d/+2d) | ● | ● | ● | ● | ● | ● | ● | ● |
The models were available with or without RS232 interface, the RS232 interface was also available as an accessory.
Hardware
Multimeter
Interface
The interface consists of the following components:
- Interface board inside of multimeter
- Printer cable 5-pin to DB9
- PC adaptor (Null modem plug with slightly unusal pinout)
The RS232 interface is designed to allow a direct connection to a serial printer or data recorder. Therefore an adaptor is required to connect it to a PC.
If the interface cannot be powered from RS232 (e. g. RS232-USB converter with too low voltage), switching on the multimeter with the FUNC button pressed powers the interface from multimeter.
The
Photos
TODO
Protocol
Printer Mode
TODO
PC communication mode
TODO
Resources
TODO