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.
Comm parameters (PC): DTR on, RTS off, RTS/CTS flow control (!).
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 printer cable has got a power connector (10-16 V DC, 50 mA) to power the multimeter and the interface externally.
Photos
TODO
Protocol
Printer Mode
TODO
PC communication mode
TODO
Resources
TODO