Norma DM950

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Norma DM9x0
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:

  1. Interface board inside of multimeter
  2. Printer cable 5-pin to DB9
  3. 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