5 Fluke Calibration

734A DC Reference Standard

For existing 732Bs or similar standards that are

already in use, the Direct Voltage Maintenance

Program is a service where Fluke Calibration can

provide calibration certificates for these stan-

dards. This service consists of two calibration

alternatives that can be used depending on your

needs.

•

Calibrations done by Fluke. Calibration

certificate services can be easily performed on

standards returned to Fluke Calibration service

facilities. Contact your Fluke Calibration repre-

sentative or your local Fluke service center for

details regarding these calibration certificate

alternatives.

•

Calibration in your laboratory. With the

732B-200 services, a standard owned and

calibrated by Fluke Calibration, including

all necessary connecting cables and clear

operating instructions, is sent to your site

for comparison with one or more of your

own reference standards. You make a series

of readings over five days and forward

the standard to the next laboratory, then

return the measurement results to the Fluke

Calibration Standards Laboratory. A value for

your reference relative to the Fluke standard

is assigned. Within one week, a preliminary

Report of Calibration is returned to you. Once

the standard is returned to Fluke Calibration,

it is compared to the Fluke Voltage Standard.

A final value is assigned to your reference,

and a final Report of Calibration is sent to you.

The 732B-200 service provides a calibra-

tion certificate for one local standard. Each

additional standard that requires a certificate

can use the 732B-201 service. In this way,

comparing multiple standards to a single Fluke

Calibration standard will provide any required

number of standards with individual calibra-

tion certificates.

Note: This service is not available in all areas. Contact

your local Fluke representative for details).

734A specifications

Output voltages

Outputs of 10.0 V and 1.018 V are provided at

separate binding-post pairs with the following

characteristics:

Stability

Stability for the 732B is specified by the follow-

ing at a temperature of Tcal ± 1 °C (15 °C ≤Tcal

± 35 °C):

Stability (ppm)

Output Voltage

30 Days

90 Days

1 Year

10 V

0.3

0.8

2.0

1.018 V

0.8

NA

NA

Noise at output terminals

Output noise is specified for both day-to-day

observations and for short-term observations.

The former is given by the standard deviation

about the regression line of a 90-day regression

model. The latter is terms of its rms value in a

bandwidth as follows:

Output Voltage

Day-to-Day (S1)

(ppm)

0.01 Hz

10 Hz (ppm)

10 V

0.065

0.06 rms

1.018 V

0.1

0.3 rms

Output current and impedance

Output Voltage

Output Current

Output

Impedance

10 V

12 mA*

≤1 mW

1.018 V

NA

≤1 kW

*Output current is limited to ≤0.1 mA to realize 72-hour operation

under battery power.

Output adjustment

10 V: 0.15 ppm resolution 1.018 V: Set at nominal

± 1 mV. No adjustment is provided, however the

output value changes when the 10 V output is

adjusted

Retrace (hysteresis) error

(Constant temperature)

≤0.1 ppm, 10 minute power off ≤0.25 ppm, 1 to

24 hours power off

Stabilization time (Constant temperature)

For best results, allow a 14-day stabilization

period after power has been off for an extended

period of time

No power interruption

No stabilization time is required after moving

into another environment

Power off <1 hour

1-hour warm up required

Power off 1 to 24 hours

24-hour warm up required