# Fluke 734A DC Reference Standard (Pre-Owned) # Fluke 734A DC Reference Standard (Pre-Owned) ## Key Features At A Glance - Four electrically and mechanically independent 732B DC Standards in a rack-width enclosure - 10V output stability of ±2 ppm per year and 1.018V stability of ±0.8 ppm per month - 10V output drives up to 12 mA to simplify use with low-input-impedance instrumentation - Each 732B operates 72 hours on internal battery; extendable to 130 hours with optional external battery and charger - Output protection: indefinite short-circuit protection; 10V input protected up to 1100V DC at 25 mA - Temperature coefficient ≤0.04 ppm/°C (10V) and ≤0.1 ppm/°C (1.018V) across 15–35°C - Compliance with ANSI ISA-S2, CSA C22.2 #231, IEC 348, IEC 1010, and UL 1244 The Fluke 734A DC Reference Standard is a direct voltage reference used to maintain the volt in primary and secondary standards laboratories. The system consists of four electrically and mechanically independent 732B DC Standards housed in a rack-width enclosure, with each 732B providing both 10V and 1.018V outputs from its own power supply, oven, supporting electronics, and packaging. The 734A was designed for laboratories that need to maintain traceability to national standards and to distribute the volt to production, service, calibration laboratories, or other remote locations. Each 732B is small and highly portable, with a 72-hour internal battery life that supports transporting the volt across town or around the world while the reference is maintained undisturbed in the laboratory. The 1.018V output simplifies intercomparisons of saturated standard cell banks in applications where those are still in use. ValueTronics International stocks, tests, and ships the 734A DC Reference Standard and individual 732B DC Standards from our 20,000 square foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Unlike drop-ship brokers and pass-through resellers, every unit in our inventory is held, inspected, and prepared in-house — so when a primary or secondary standards lab orders a 734A from us, the unit ships from a facility that has physically handled it, not from a listing routed to a third party. ## Brand Heritage Fluke Corporation is a long-established US manufacturer of precision test, measurement, and calibration instrumentation, headquartered in Everett, Washington. Fluke became part of Danaher Corporation in 1998, and in 2016 Danaher spun off several of its industrial businesses — including Fluke — as Fortive Corporation, which remains Fluke's current parent. ## Compare Other Models in This Series The 734A family covers the maintenance and dissemination of the DC volt at the primary and secondary standards laboratory level. The 734A is the full rack-width system containing four electrically and mechanically independent 732B DC Standards, and the 732B is the same standard offered individually for customers who need fewer cells or who want to add capacity to an existing 734A enclosure. Each 732B provides both a 10V and a 1.018V output and includes its own power supply, oven, supporting electronics, and packaging. This independence is what allows the four cells in a 734A to be intercompared without common-mode error sources, and it is what allows a single 732B to be transported to a remote location while the rest of the reference remains undisturbed in the laboratory. Each pre-owned model below is its own dedicated product page with condition-matched pricing, inventory status, and warranty terms. Click through to the model that matches your application — the 734A for a complete four-cell rack-width reference, or the 732B for an individual DC Standard. The 734A is purchased when a laboratory needs the complete four-cell architecture in a single rack-width enclosure from the outset — for example, when establishing a new primary or secondary standards capability, or when the four-cell intercomparison approach described in NBS Technical Note 1239 is the operating model from day one. The 734A-7001 enclosure is also available separately for customers who are building up to four cells over time. The two listings differ in form factor and quantity rather than in measurement performance. A single 732B delivers the same 10V output (±2 ppm per year stability, 12 mA drive capability) and the same 1.018V output (±0.8 ppm per month stability) as any one of the four cells inside a 734A — they are the same instrument. The 734A simply integrates four of them into the rack-width 734A-7001 enclosure and supports the four-cell intercomparison architecture from a single purchase. The comparison table that follows lists the cell count, output voltages, output drive current, stability specifications, battery operating time, and physical dimensions for each configuration. Use the table to confirm which form factor matches your laboratory's intended reference architecture and rack space. Model Output Voltages 10V Stability (1 Year) Configuration **734A** 10V and 1.018V ±2 ppm/year Four 732Bs in rack-width enclosure 732B 10V and 1.018V ±2 ppm/year Standalone portable standard Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Accessories Supplied - Four 732B DC Standards - Rack-width enclosure (734A-7001) ## Product Core & Specifications Specification 732B / 734A Output Voltages Outputs 10.0V and 1.018V at separate binding-post pairs Stability (at Tcal ±1°C, 15°C ≤ Tcal ≤ 35°C) 10V — 30 Days 0.3 ppm 10V — 90 Days 0.8 ppm 10V — 1 Year 2.0 ppm 1.018V — 30 Days 0.8 ppm Noise at Output Terminals 10V — Day-to-Day (S1) 0.065 ppm 10V — 0.01 Hz to 10 Hz 0.06 ppm rms 1.018V — Day-to-Day (S1) 0.1 ppm 1.018V — 0.01 Hz to 10 Hz 0.3 ppm rms Output Current and Impedance 10V — Output Current 12 mA (limited to ≤0.1 mA for 72-hour battery operation) 10V — Output Impedance ≤1 milliohm 1.018V — Output Impedance ≤1 kohm Output Adjustment 10V 0.15 ppm resolution 1.018V Set at nominal ±1 mV; no adjustment provided (changes when 10V output is adjusted) Retrace (Hysteresis) Error (Constant Temperature) 10 minute power off ≤0.1 ppm 1 to 24 hours power off ≤0.25 ppm Stabilization Time (Constant Temperature) Extended power-off period 14-day stabilization recommended No power interruption None required after moving environments Power off <1 hour 1-hour warm-up Power off 1 to 24 hours 24-hour warm-up Temperature Coefficient of Output (15°C to 35°C) 10V TC ≤0.04 ppm/°C 1.018V TC ≤0.1 ppm/°C Load Regulation (10V Output) 0 to 12 mA load change <1 ppm 0 to 2 mA load change <0.1 ppm Line Regulation 10% line voltage change or full battery range ≤0.05 ppm Output Protection Short circuit Indefinite, no damage External voltage ≤220V dc Protected up to 50 mA continuous External voltage ≤1100V dc Protected up to 25 mA continuous or up to 0.6 joules Environment Normal Operation 15 to 35°C, 15-80% RH, 0-6,000 ft Safe Operation 0 to 50°C, 15-90% RH, 0-10,000 ft Storage (no battery) \-40 to 50°C, non-condensing, 0-40,000 ft Line Power Requirements Voltage 90-132V ac or 180-264V ac Frequency 47-63 Hz Battery Operation Battery life (fully charged, 23°C ±5°C, output <0.1 mA) Minimum 72 hours Recharge time <24 hours with self-contained charger External DC input Rear-panel; accepts 12V to 15V dc source Isolation Output terminal to earth ground or ac mains At least 10,000 MΩ shunted by less than 1000 pF Guard and Grounding Chassis ground Terminals on front and rear panels Internal guard access Front-panel terminal Compliance with External Standards Standards ANSI ISA-S2, CSA C22.2 #231, IEC 348, IEC 1010, UL 1244 Mechanical — 732B Height 5.3 inches (13.5 cm) Width 3.9 inches (9.9 cm) Depth 16.5 inches (41.9 cm) Weight 13 lb (5.9 kg) Mechanical — 734A Height 7.5 inches (19.1 cm) with feet; 7.0 inches (17.8 cm) without feet Width 17.0 inches (43.2 cm) Depth 19.75 inches (50.2 cm) Weight 65 lb (29.6 kg) **Important:** Allow a 14-day stabilization period after extended power-off for best results. After power off less than 1 hour, a 1-hour warm-up is required; after power off 1 to 24 hours, a 24-hour warm-up is required.**Important:** The 732B-200 on-site calibration service is not available in all areas; contact your local Fluke representative for details.**Important:** For best results, allow a 14-day stabilization period after power has been off for an extended period of time. After power off <1 hour, a 1-hour warm-up is required; after power off 1 to 24 hours, a 24-hour warm-up is required.**Important:** 10V output current is limited to ≤0.1 mA to realize 72-hour operation under battery power.Recommended pairing: combine a 732B with the 742A-1 and 742A-10k Resistance Standards to build the artifact calibration support package for the Fluke 5700A or 5720A Calibrator or the HP 3458A Multimeter named in the datasheet. ## 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.** ## Details - **Price:** 0.0 USD - **Vendor:** Fluke - **Type:** Dc Volt Std - **Tags:** Fluke, Manufacturers, Other Equipment, product_manual_group_1, Product_used, Standard ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 0.00 USD | In stock | ## Images - Fluke 734A DC Reference Standard (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/734a-fluke-standard-used) > Updated: 2026-05-30