Fluke 732B - Introduction

Introduction and Specifications
Introduction
1
1-3
Introduction 1-1.
Caution
Set the rear panel BAT switch to ✡ (on) before connecting AC
power. This is required for proper instrument operation. If your
732B was shipped cold, you will need to calibrate it against a
traceable standard as described in Section 5 before you begin
using it. For best results, leave the standard powered for a
minimum of 14 days before you calibrate and begin using it.
Model 732B is a dc voltage laboratory standard that produces reference voltages of 10V
and 1.018V. Model 734A contains four 732B DC Standards in a chassis. The 732B is
highly stable, rugged and transportable. Its 10V output excels in stability, and can be
used as your direct link in the traceability chain to national standards. You can use the
732B 1.018V output to transfer the "volt" at the 1.018V level from one set of saturated
standard cells to another. You can also use the 1.018V output as a working standard with
older equipment that requires a standard cell voltage input.
The 10V output’s long-term stability, predictable drift rate, low uncertainty, convenient
level, and immunity to accidental damage make the 732B or 734A the preferred artifact
for maintaining a local standard of voltage. With time characterization (Calibration
Option 732B-100) the drift rate for the 10V output is given. This reduces the 10V output
uncertainty from 2 ppm/year to 1 ppm/year.
All outputs of the 732B can withstand short circuit indefinitely, without damage to the
instrument or disruption of the state of calibration. Recovery time for a momentary short
is less than 2 minutes; for an extended short, recovery time is less than 2 hours.
To maintain calibration as a traceable standard, the 732B must continue to receive
uninterrupted operating voltage from ac line power or from the internal battery. If
battery voltage drops too low, the front panel IN CAL indicator goes out and
recalibration is required.
The internal rechargeable battery (if switched on) protects the standard from line power
interruption and provides power for hot shipment (shipment under power). The 732B
outputs are unaffected as you change between battery or ac line power. Battery operation
with a fully charged battery lasts at least 72 hours. You can extend battery operation by
connecting an external 12V battery such as Model 732B-7001 to the rear panel
MONITOR/EXT BAT IN connector. Plugging the 732B into ac line power for 24 hours
fully recharges the internal battery.
Four front panel indicators show operating status. Model 732B-7001 External Battery
and Charger has all but the IN CAL indicator.
• AC PWR lights when the 732B is connected to ac line power.
• IN CAL goes out to warn you when the 732B may have lost its calibration. This
indicator responds to an excessively large drop in battery voltage or a large change
in oven temperature. If battery voltage falls below the level needed to keep the 732B
working normally, the IN CAL indicator extinguishes, indicating a loss of the state
of calibration. Once power is restored and the output has been verified, you can reset
the IN CAL indicator.
Note
An illuminated IN CAL indicator is not sufficient by itself to indicate the
732B satisfies the specifications of section 1-12. See Calibration label on
front of the 732B for calibration due date.
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