Difference between revisions of "Norma DM950"
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File:Norma DM950 7.JPG|<small>Board without RS232 interface board</small> | File:Norma DM950 7.JPG|<small>Board without RS232 interface board</small> | ||
File:Norma DM950 8.JPG|<small>Inside with RS232 interface board</small> | File:Norma DM950 8.JPG|<small>Inside with RS232 interface board</small> | ||
File:Norma DM9x0 Interface Board 1.JPG<small>Interface board, back side</small> | File:Norma DM9x0 Interface Board 1.JPG|<small>Interface board, back side</small> | ||
File:Norma DM9x0 Interface Board 2.JPG<small>Interface board, front side</small> | File:Norma DM9x0 Interface Board 2.JPG|<small>Interface board, front side</small> | ||
</gallery> | </gallery> | ||
Revision as of 17:04, 3 October 2013
 | |
| Status | planned |
|---|---|
| Counts | 21000 |
| IEC 61010-1 | CAT II 600 V, CAT III 300 V |
| 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 RS232 interface is optional. All models were available with or without RS232 interface, the RS232 interface was also available as an accessory.
Hardware
Multimeter
Interface
The RS232 interface consists of the following components:
- Interface board (installed 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
Multimeter:
Outer package
Package
Outer package
Front without rubber holster
Back without rubber holster
Battery case open
Board without RS232 interface board
Inside with RS232 interface board
Interface board, back side
Interface board, front side
RS232 cable:
Printer Cable (original) and PC Adaptor (look-alike)
Protocol
Printer Mode
TODO
PC communication mode
TODO
Resources
TODO