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CTR9000 -- Primary-Standard Resistance Thermometry Bridge

Category: TEMPERATURE, CALIBRATORS

Model: Temperature Standard, Temperature Standards

Avaibility: AVAILABLE

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In metrology, the most important consideration is the quality of the fundamental measurement. The bridge technology from ASL represents the peak of performance in resistance thermometer measurement. It exploits the inherent advantages of AC bridge technology to maintain repeatable measurements of highest precision under practical operating conditions.

The model CTR9000 primary-standard resistance thermometry bridge is designed specifically for resistance thermometry to provide the best possible accuracy.

The 25/30 2) Hz or 75/90 2) Hz operating frequency provides fast, continuous measurement with high immunity to thermal EMF errors and supply frequency noise sources. Practical measurements involve cables, connectors and imperfect operating environments. The CTR9000 achieves its full specification under a wide range of real operating conditions.

AC bridge technology will always outperform measurements made using DC technology with slow current reversal. These benefits are inherent to the fundamentals of electrical measurement and not just the implementation.

Specifications

Model CTR9000

Input channels

2 on the main device (one platinum resistance thermometer (PRT) or standard platinum

resistance thermometer (SPRT) or resistor + one reference resistor)

60; over multiplexer CTS9000

Input connections

4 x BNC + shield (front panel)

Data entry format

ITS 90 and CVD for calibrated probes; or EN 60751 for uncalibrated probes

Accuracy 1)

0.1 ppm ratio error over full range or 20 ppb ratio error over full range, dependent on configuration

Measuring ranges

Sense current

1 mA, 2 mA, 5 mA

Sense current mulitpliers

0.1, 10 and ?2

Sense current accuracy

Accuracy option 0.1 ppm: ±1 %

Accuracy option 20 ppb: ±0.1 %

Carrier frequency

50 Hz supply frequency: low 25 Hz, high 75 Hz

60 Hz supply frequency: low 30 Hz, high 90 Hz

Phase locked to the local supply frequency

Bandwidth

Accuracy option 0.1 ppm: 0.5 Hz, 0.1 Hz, 0.02 Hz

Accuracy option 20 ppb: 0.5 Hz, 0.2 Hz, 0.1 Hz, multiplier x 0.1, x 0.01

Measuring range

0 ... 260 ?

Rated accuracy range

0 ... 130 ?

Rs range

1 ... 200 ?

Display

Range

Accuracy option 0.1 ppm: 1.299 999 9 ratio of two resistors

Accuracy option 20 ppb: 1.299 999 999 ratio of two resistors

Resolution

The digital resolution is typically 0.01 ppm with a Pt100 at 1 mA.

Voltage supply

Power supply

AC 240 V, AC 220 V

AC 120 V, AC 100 V

User selectable on rear panel

Supply frequency

50 or 60 Hz

Power consumption

max. 250 VA

Permissible ambient conditions

Operating temperature

15 ... 25 °C

Communication

Interface CTR9000

IEEE-488.2

Interface via driver module CTS9000

RS-232 or IEEE-488.2

(optional)

Case

Dimensions

Approx. 545 x 382 x 500 mm (W x H x D)

Weight

46 kg

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