- Design and construction
- Temperature coefficient performance
- Temperature coefficient results with oven
- Comparison with Fluke 732B
- Summary & Conclusion
In this article legacy, but still very good Fluke 732A DC Voltage standard will be serviced and tested. We have multiple units so inter-comparisons will be performed to obtain relative drift rate.
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Manuals and service information
Comparison for known specifications of production resistance standards:
|Specification||Fluke 732A||Fluke 732B||Fluke 734A||Datron 4910||Fluke 5720A calibrator|
|Output voltage, DC||1V, 1.018V, 10V||1.018V, 10V||4 × 1.018V, 10V||4 × 1.018V, 10V||up to 1100V|
|Accuracy (1y, 10V)||±6 ppm||±2 ppm||±2 ppm||±1 ppm||±2 ppm|
|Accuracy (30 day, 10V)||±0.5 ppm||±2 ppm||±2 ppm||±1 ppm||±2 ppm|
|Temperature coefficient, ppm||±0.05 ppm/°C||±3 ppm||±1.5 ppm||<±0.1 ppm/°C||±3 ppm max (18-28°C)|
|Adjustment range||50µV, <0.05ppm|
|Long term 1 year stability, ppm||? , ?||±8 ppm||±4 ppm||±0.5 ppm||±2 ppm|
|Reference design solution||Motorola SZA263/LTFLU-1||up to 4 x Linear LTZ1000ACH||2 x LTFLU-1|
|Max load current||12 mA||200 mA||600 µA||10 mA||418 mA|
|Output noise||<1 µVRMS, 0.1-10Hz|
|Construction type||Rugged half-rack module||Rugged ¼-rack module||Full-width 19” rack frame||Rugged half-rack module||Full-size rackmount|
|Active thermal compensation||Yes, +45° C oven assembly||Yes, multiple sections|
|Operation range, ambient °C||+0…+40||0…+50|
|Power requirements||100,120,220,240VAC or 24-40VDC||Not required, passive device|
|Backup/offline power supply||Internal +24V Battery bank, 12 hours life||Not required, passive device|
|Dimensions, weight||191 × 221 × 603 mm, 12.3kg||254 × 206 × 311 mm, 4.8kg||86 × 105 × 127 mm, 730g|
|MSRP||~$2000 USD||$9000 USD||$37000+ USD||$9000+ USD||$30000+ USD|
Design and construction
Modified: Oct. 3, 2018, 11:45 a.m.