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td1470 calibrator for single and double bridges
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overview

model td1470, an intelligent calibrator that can accurately simulate a wide range of dc standard resistance. the low resistance range is from 100 μω to 111 ω, the medium to high resistance range is from 10 ω to 11 mω, the optimal accuracy is up to ±0.01 %. the input current range is from 1 ma to 11 a for low resistance measurement, from 0.25 μa to 80 ma for medium to high resistance and fully-automatically switch on all ranges.

applied to calibrate single bridges (wheatstone bridges), double bridges, digital bridges and digital microhmmeters.

meet the requirements of jjg 125-2004 verification regulation of d.c. bridges and jjg 837-2003 verification regulation of d.c. low resistance meters.

applications

calibrate single bridges (wheatstone bridges) and double bridges (classes 0.05 and below). e.g., qj44, qj42 and qj57.

 calibrate dc ohmmeters (classes 0.05 and below)

 calibrate temperature measuring bridges (classes 0.05 and below)

features

 full digital adjustment and programming interface, and the self-calibration function ensure an accurate and stable measurement for a long time.

 compared with the traditional physical standard resistance box, the typical resolution is as low as 0.1 mω, there is no error effect caused by the residual resistance and contact resistance from bandswitch, and avoids the resistance change caused by overload.

 the maximum input current is up to 11 a, and fully-automatically switch on all ranges. the strong capability of current overload avoids the resistance change caused by overload.

 the apparatus is fully tested by esd and emc, which makes a high reliability.

 hd lcd touch screen make intuitive display and convenient operation.

 connect the apparatus to a computer via rs-232 interface, easy to build computer automatic test system.

electrical specifications

low resistance

111

equivalent resistance characteristics

 input current range: 1 ma to 11 a

 range switching: automatic or manual

 connection: 4-wire

 display: 7 digits

 test condition: 23 °c ±1 °c, 40% to 60% r·h, warm-up for 1 hour.

medium to high resistance

equivalent resistance characteristics

  resistance range: 10 ω to 11 mω

 range switching: automatic or manual

 connection: 2-wire or 4-wire

 display: 7 digits

 test condition: 23 °c ±1 °c, 40% to 60% r·h, warm-up for 1 hour.

general specifications

222

 line power: 220 v ±22 v, 50 hz ±2 hz

 operating environment: +18 °c to +28 °c, r·h from 40 % to 60 %, non-condensing

 storage environment: +5 °c to +40 °c, r·h <85 %, non-condensing

 communication: rs-232 interface

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