Fluke 732A DC Reference Standard (Pre-Owned)

Key Features At A Glance

• 10V, 1V, and 1.018V outputs from a single solid-state reference standard
• 0.5 ppm per month stability on the 10V output (18°C to 28°C)
• Short-circuit proof — may be shorted indefinitely without damage or loss of stability
• Line and rechargeable battery powered with 12-hour internal battery for calibration transfer
• Output noise <1 µV rms at 10V output from 0.1 Hz to 10 Hz
• Load regulation <6 ppm at 10V output from 0 to 12 mA
• High thermal gain internal oven allows full accuracy over 23°C ±5°C operating range
• Traceable calibration available through the Fluke Direct Voltage Maintenance Program to NBS

The Fluke 732A is a solid-state DC reference standard providing 10V, 1V, and 1.018V outputs in a single instrument. Its 10V output offers better resolution, lower noise, and simpler operation than standard saturated cells, while the 1V and 1.018V outputs allow direct substitution for saturated standard cells in many traceability applications.

The 732A is designed for primary voltage reference work in calibration laboratories, standards transfer, and high-performance instrument calibration. The 10V output as a primary reference reduces thermal emf and noise effects compared to saturated cell stacks, and the 1V and 1.018V outputs allow the 732A to function as a direct replacement for saturated standard cells where those cells are fragile or unsuitable for transport. The instrument was originally developed for Fluke's own manufacturing facility to transfer the volt into operations, and its performance led to its release for the broader commercial calibration market.

ValueTronics stocks and tests Fluke 732A DC reference standards from our 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Standards-grade instruments like the 732A require careful handling, documented inspection, and a knowledgeable supplier who understands the difference between a unit that powers on and one that holds its specified stability — and that is the standard we hold every reference standard to before it ships.

Brand Heritage

Fluke Corporation has operated under its own name in the precision measurement industry for decades and remains the source brand for this instrument. The 732A predates the corporate reorganizations that affected other test and measurement product lines and continues to be referenced by its original Fluke designation throughout the calibration laboratory community.

Compare Other Models in This Series

The 732A is offered as a single model with three calibration and shipment options that differ in how the unit arrives at the customer's facility relative to its reference standards laboratory baseline. All three options are the same hardware — the 732A DC Reference Standard — with the same 10V, 1V, and 1.018V outputs and the same stability, temperature coefficient, and output specifications.

The differences across the three options come down to whether the unit ships with standard calibration, with a special calibration performed at the Fluke Standards Laboratory, or with both a Standards Laboratory calibration and drift certification — and, in the latter two cases, whether the unit is shipped hot (continuously powered) to preserve its calibrated state in transit.

Each pre-owned 732A configuration shown below is its own dedicated product page with condition-matched pricing. Select the option that aligns with your laboratory's calibration transfer requirements and your facility's procedures for receiving a powered reference standard.

The base 732A ships with the standard factory calibration and is delivered in the normal manner — the receiving laboratory powers the unit up and stabilizes it for 24 hours before performing its own calibration against local traceable standards. This is the appropriate configuration when the receiving facility maintains its own reference standards and intends to characterize the 732A against those standards on arrival.

The 732A-000 ships with a special calibration performed at the Fluke Standards Laboratory and is shipped hot — continuously powered during transit — to preserve the calibrated state. The 732A-100 adds drift certification to the Standards Laboratory calibration and is also shipped hot. These two options are designed for facilities that need to receive the reference standard with a traceability path already established back to the Fluke Standards Laboratory, rather than performing the establishing calibration on arrival. The comparison table that follows details the configuration, shipping state, and price of each option.

Model	Outputs	Stability (30 Days)	Stability (1 Year)
732A	10V, 1V, 1.018V	±0.5 ppm (10V)	±3.0 ppm (10V)
732A-000	10V, 1V, 1.018V	±0.5 ppm (10V)	±3.0 ppm (10V)
732A-100	10V, 1V, 1.018V	±0.5 ppm (10V)	±3.0 ppm (10V)

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Accessories Supplied

• Instruction manual
• Line cord
• Adjustment tool

Product Core & Specifications

Specification	Value
Stability: Parts per million, 18°C to 28°C
10V Output — 30 Days	±0.5 ppm
10V Output — 90 Days	±1.0 ppm
10V Output — 6 Months	±1.5 ppm
10V Output — 1 Year	±3.0 ppm
1.018V Output — 30 Days	±1.5 ppm
1.018V Output — 90 Days	±4.0 ppm
1.018V Output — 6 Months	±6.0 ppm
1.018V Output — 1 Year	±12.0 ppm
1V Output — 30 Days	±1.5 ppm
1V Output — 90 Days	±4.0 ppm
1V Output — 6 Months	±6.0 ppm
1V Output — 1 Year	±12.0 ppm
General
Temperature Coefficient	±0.05 ppm per °C for 10V range, ±1.0 ppm per °C for 1V and 1.018V ranges, from 18°C to 0°C or 28°C to 40°C
Output Adjustment	±50 µV for 10V and 1.018V ranges, ±5 µV for 1.0V range
Output Impedance	≤5 mΩ for 10V output, 1 kΩ for 1V and 1.018V outputs
Output Current	≤12 mA at 10V output. Limited by 1 kΩ output impedance at 1V and 1.018V output
Output Protection	May be shorted indefinitely. Protected against high voltage input transients to 1100V
Load Regulation	≤6 ppm at 10V output from 0 to 12 mA
Line Regulation	≤0.05 ppm of output for ±10% line change
Output Noise	≤1 µV rms at 10V output from 0.1 Hz to 10 Hz
Operating Temperature	0°C to 40°C, operating; 0°C to 50°C, non-operating (with internal battery pack switched off)
Relative Humidity	≤95% to 30°C, ≤75% to 40°C, non-condensing
Altitude	<3050m (10,000 ft) operating
Vibration	Per MIL-T-28800, Type III, Class 5, Style E
Safety	IEC 348, 2nd edition, 1978 and ANSI C39.5, 1980
Power	100V, 120V, 220V, or 240V ac ±10%, 50 to 400 Hz or 24 to 30V ac 50 to 60 Hz. Also external 24 to 40V dc. Internal 24-V lead acid, gelled electrolyte battery operates for 12 hours at 23°C when fully charged. Trickle-charged continually when external power is applied
Size	19.1 cm H x 22.1 cm W x 60.3 cm D (7.53 in x 8.69 in x 23.75 in)
Weight	12.3 kg (27 lb)
Included	Instruction manual, line cord, adjustment tool

Important: The 732A is normally shipped from the factory with the battery switch turned off. Upon receipt, the 732A must be powered up and stabilized for 24 hours before calibration against traceable standards.Important: The 732A is normally delivered without absolute uncertainty specifications. To maintain calibration as a traceable standard, the 732A must continue to receive uninterrupted operating voltage from line power or from the self-contained batteries, which provide approximately 12 hours of off-line operation.Important: The 732A is normally shipped from the factory with the battery switch turned off. Upon receipt, the 732A must be powered up and stabilized for 24 hours before calibration against traceable standards.Important: The absolute uncertainty specifications for the 732A must then relate to the uncertainty specifications of the traceable standards used for this calibration.Important: Specifications include effects of line voltage variations of ±10% and assume the 732A has been continuously powered.Important: For a certified calibration by the Fluke Standards Laboratory and shipment under power, refer to the 732A-000 and 732A-100 options described under the Direct Voltage Maintenance Program.Recommended pairing: the 732A-7002 Transit Case for transport between calibration sites, and the 732A-7004 Rack Shelf when racking two 732A units (or a 732A alongside a 752A) in a standards laboratory configuration.

About this used unit

• Warranty included
• Functional verification included
• Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data.
• Note that unnecessary accessories may not be included (contact Test Architect to confirm).

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.