The performance of the model CTR6500 resistance thermometry bridge is improved significantly by using the proven AC bridge technology. Due to the elimination of thermal EMF errors and the automatic cancellation of probe and cable reactance effects, the CTR6500 provides excep-tional stability with time and ambient temperature and has an excellent resolution thanks to inherently low noise.
These make the CTR6500 perfectly suited to high-accuracy temperature measurement and calibration. The CTR6500 has 25 ? and 100 ? internal standard resistors and can also be used with external standard resistors. It has a ratio range of 0 ... 4.9999999 or 0 ... 500 ? resistance and is capable of measuring temperature ranges to meet ITS 90, CVD and EN 60751 standards.
The results are shown on the large-scale, multi-function VFD screen. The mean, min and max value, standard deviation and the sampling rate can also be displayed with a separate graphical display. To ensure the long-term reliability the CTR6500 uses surface mount technology with no mechani-cal relays.
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 Specifications
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Model CTR6500
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Probe types
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Industrial platinum resistance thermometers (PRTs) and standard platinum resistance
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thermometers (SPRTs) with Ro = 25 ? and 100 ? up to an alpha of 0.00392
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Input channels
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2 on the main device (one PRT, SPRT or resistor + one reference resistor)
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60 over multiplexer CTS9000
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Input connections
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4 x BNC + shield (front panel)
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Data entry format
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ITS 90 and CVD for calibrated probes; or EN 60751 for uncalibrated probes
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Measuring ranges
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Sense current
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100 µA, 200 µA, 500 µA, 1 mA, 2 mA, 5 mA, 10 mA
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Sense current mulitpliers
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x ?2
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Temperature range
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-200 ... +962 °C, depending on thermometer probe
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Resistance range
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0 … 500 ?
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Internal resistors
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Values
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25 ?, 100 ?
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Thermal stability TCR
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±0.1 ppm/°C
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Accuracy
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±0.01 % (uncalibrated)
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Accuracy 1)
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Ratio range 0 ... 1 accuracy 0.4 ppm equivalent to 0.1 mK at 0 °C
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Ratio range 1 ... 2 accuracy 0.6 ppm equivalent to 0.3 mK full range
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Ratio range 2 ... 3 accuracy 0.8 ppm equivalent to 0.8 mK full range
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Ratio range 3 ... 5 accuracy 1 ppm equivalent to 1.25 mK full range
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Display
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Screen
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large graphic VFD display screen (adjustable brightness)
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Units
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Ratio, °C, °F, K or ?
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Resolution
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0.1 ppm
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0.01 mK
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0.001 m?
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Functions
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Real-time clock
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integrated clock with date
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Voltage supply
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Power supply
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AC 90 ... 264 V, 47 ... 63 Hz; universal rear input on rear panel
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Power consumption
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max. 95 VA
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Permissible ambient conditions
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Operating temperature
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15 ... 25 °C
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Storage temperature
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-20 ... +50 °C
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Communication
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Interface
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USB, RS-232 or IEEE-488.2
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Case
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Dimensions
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455 x 150 x 450 mm (W x H x D)
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Weight
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9 kg
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