Contents
- Intro
- Disclaimer
- Manuals
- Design and construction
- Restoration
- Temperature coefficient performance
- Temperature coefficient results with oven
- Comparison with Fluke 732B
- Summary & Conclusion
Intro
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.
Disclaimer
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Manuals and service information
Fluke 732A DC voltage standard system instruction manual
Fluke 732B/734A DC voltage standard instruction manual
Fluke 7001 series DC voltage standard system instruction manual
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 | |||
| Temperature sensor | Yes | ||||
| 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: April 25, 2021, 9:30 a.m.