Fluke 732 series DC Voltage Standards service, modifications, testing



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
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

Author: Todd M.
Published: May 31, 2017, 4:01 p.m.
Modified: April 25, 2021, 9:30 a.m.