Cropico IEC 1422 Computer-Controlled Decade
Computer-Controlled High-Precision Resistance Decade
Model 1422 IEC, 1423 IEC, 1424 IEC, 1422 RS232, 1423 RS232, 1424 RS232
Highest precision, temperature and long-term consistency are characteristic features of the described high-precision resistance decade. Many years of experience, tried-and-tested technology and the use of field-proven materials guarantee the high level of precision.
The decade resistors consist of low-capacity and low-inductance wire wound of Zeranin. The low temperature coefficient of this material, the low error tolerance of the resistors and the long-term stability achieved through careful artificial ageing are the guarantee for reliable conformity with the technical specifications for this decade resistor.
A specially developed precision stepping switch with high-quality contact materials and optimal brush construction guarantee very good reproducibility. The contacts are self-cleaning and virtually free of thermoelectric power. All 6 decade resistor stages are contained in an attractive 19" casing . The casing acts as screen against electrostatic interference. It is conductively connected to the earth socket on the front panel. Electrical connection of the decade resistor to the screen is possible with a connecting link.
The two sub-decades R D1 and R D2 are arranged so that they can be operated independently. An insulated plug-in link joins the two sub-decades together to form a six decade resistor.
This makes the decade resistors suitable for universal applications. Very low zero-sequence resistance has been achieved by circuit optimization. This very low zero-sequence resistance is divided again if only one decade section is being used.
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Application |
| Computer Control Each of the 3 versions - type 1422, 1423 or 1424 - is also available with computer control. IEEE488 and RS232 interfaces are available. The RS232 version is easily extended to RS485 or RS422. The stepping motors used do not alter the known high long-term stability and reproducibility of the decades with computer control either. |
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6-stage high-precision resistance decade |
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2 x 3-stage high-precision resistance decade |
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2 variable normal resistors |
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Scalers with random-setting divider ratio |
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Ranges from 10 x 0,01Ohm to 10 x 100,000 Ohm |
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Error tolerance 0.01 % |
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Resistor material: ZERANINŽ |
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Temperature coefficient <=2 ppm/K |
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Long-term stability < 0.01 % over years |
