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DDM 900

20.- Englisch > High precision bench instrument

DDM 900

High precision bench instrument  The DDM 900 is designed for precise temperature
measurements as demanded in calibration-laboratory use and
quality assurance. The accuracy is adapted to the
uncertainties of fix-point-cells for precise sensor
calibrations. Pt 10-, Pt-25- and Pt 100-Sensors can be used
at the same time. The resolution of up to 0,02 mK often is
needed in physical and chemical laboratories.
Product features  -• Accuracy: 5 mK
• Resolution: 1 mK
• Range: -220 °C to +1200 °C
• Pt100, -25 and Pt10-Sensors
• User defined coefficients for ITS 90 and EN60751
• Fast measurements: up to 8/s
• Excellent long-time stability
• Compensation of self heating error
• No impairment of the measurement results through
parasitic thermovoltage
• Extensible up to 81 measuring channels
• True 4-wire-technique with Lemo-plugs
• High EMC
• High data reliability in terms of sensor
coefficients
Available accessoires  - external multiplexers with 8 or 16 channels (up to 5
switches may be cascade-connected)
- PC software for operation of instrument and measuring
data acquisition
- temperature sensors
Technical data  The following specifications are only valid for a nominal
operating voltage and a environmental temperature of 23¡ãC.
Measuring range  -200°C up to 962°C (according to ITS-90)
-200°C up to 850°C (according to DIN EN60751)
Resolution  1 mK
Measuring uncertainty  10 mK (optionally 5 mK in the range of -50¡ãC up to 250¡ãC)
Measuring channels  2 (optionally up to 81 with external multiplexers)
Sensors  Pt-100/Pt-25/Pt-10 in a four-conductor-technology
Connectors  Lemo 1S, quadripolar, in front panel
Measuring current  about 0,5 mA switched DC (about 1 mA for Pt-25)
Measuring time  about 1 sec. per channel, about 0,1 sec. per channel with
reduced resolution
Long-term stability  5 mK / year
Temperature coeff.  1 mK/K
Display  LCD, LED backlight, 2 lines ¨¤ 16 characters, 9 mm height
Units  °C, °F, K, Ohm
Interface  RS-232, isolated
Operation  menu orientated, alternatively controllable by your PC
Memory  128 KB (optionally 512 KB)
Suppy  230 V, 50 Hz / 115 V, 60 Hz about 15 VA
Size  260 x 80 x 240 (width x height x depth in mm)
Weight  about 2,5 kg

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