The 732B is a direct voltage standard with 10V and 1.018V outputs. The 734A is a direct voltage reference standard that consists of four 732Bs that are mechanically and electrically isolated, housed in a rack-mountable enclosure.

The 734A is designed to be a primary voltage standard for primary and secondary calibration and standard laboratories. Because it is made up of four independent standards, intercomparisons of the standards and statistical methods can be used to reduce the uncertainty of the reference significantly over time.

Because each 732B is independent, it can be removed from the 734A and used as a portable standard to transfer a value from the primary 734A reference to remote service or production locations for traceability, without disturbing the primary reference.

The 734A is the only standard of its type that meets the design requirements of Technical Note NBS 1239, published by the U.S. National Institute of Standards and Technology in 1987.

The 734A is the only standard of its type offering complete mechanical and electrical independence of each of its four standards.

Small, portable, and rugged

Each standard is small, light and rugged, ideal for shipment. The long 72-hour battery life allows the 732B to be shipped over long distances under power. An optional external battery and charger extends battery life still further, to more than 130 hours.

The 732B can stand up to a lot of abuse. The inputs can be shorted indefinitely and are protected up to 1100V dc, 25 mA, without damaging the cell or affecting its output.

Confidence

The 732B is based on the proven technology of the Fluke 732A, the first standards lab quality electronic reference to gain acceptance as a replacement for saturated standard cells. Originally designed for internal transfers of Fluke's corporate volt to the production floor, thousands are now in service world-wide in a variety of applications -- from maintaining an institutional reference to transferring values from national labs or privately-operated 10V Josephson Arrays.

Stability

Stability for each output is ±2 ppm per year (10V) and ±0.8 ppm per month (1.018V). Each 10V output can drive up to 12 mA of current to simplify use with instrumentation - like the 5700A - with low output impedance.

With the 734A, it is remarkably easy to establish a fractional part-per-million voltage reference in your laboratory. Over time, with frequent intercomparisons of the four cells, and regular calibrations of one or more cells, you can reduce the uncertainty of your 734A by a factor of 3 or more.

Support for artifact calibration

Combined with the Fluke 742A-1 and 742A-10k Resistance Standards, a single 732B makes a tough and compact artifact calibration support package for instruments like the 5700A/5720A Calibrators from Fluke or the 3458A Multimeter from Hewlett-Packard.

General Specifications
Temperature	15°C to 35°C, operating; -51°C to 71°C, non-operating (with internal battery pack switched off)
Relative Humidity	£95% to 30°C, £75% to 35°C, non-condensing
Altitude	£3049m (10,000 ft) operating, £12,195m (40,000 ft) non-operating
Vibration	Per MIL-T-28800; Type III, Class 5, Style E
Safety	Designed to IEC 348, 2nd edition; 1978 and ANSI/ISA-S82; and UL1244, 2nd edition 1980, CSA C22.2 No 231, and IEC 1010
Size	734A DC Reference Standard:  17.8 cm H x 43.2 cm W x 50.3 cm D (7 in H x 17 in W x 19.8 in D) (with handles)  -------- 732B DC Standard:  13.4 cm H x 9.8 cm W x 40.6 cm D (5.28 in H x 3.86 in W x 15.98 in D)  -------- 732B-7001 External Battery and Charger:  13.4 cm H x 9.8 cm W x 40.6 cm D (5.28 in H x 3.86 in W x 15.98 in D)
Weight	734A DC Reference Standard:  29 kg (65 lbs.)  -------- 732B DC Standard:  5.91 kg (13 lbs.)  --------- 732B-7001 External Battery and Charger:  5.45 kg (12 lbs.)
Power, battery life	732B DC Standard:  100V, 120V, 220V, 240V ac ± 10%; 50 Hz to 60 Hz; 66W max. Internal 12V lead acid, gelled electrolyte battery operates for 70 hours at 23°C when fully charged. Trickle-charged continually when external ac power is applied.  -------- 732B-7001 External Battery and Charger:  100V, 120V, 220V, 240V ac ± 10%; 50 Hz to 60 Hz; 66W max. Internal 12V lead acid, gelled electrolyte battery operates for 70 hours at 23°C when fully charged. Trickle-charged continually when external ac power is applied.