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Section ,1
Introduction
GENERAL
DESCRIPTION
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The 5440 Series Direct Voltage Calibrators are programmable or stand-alone dc
voltage calibrators with an output voltage range of -1 IOOV dc to $1 lOOV dc and
uncertainty ofthree to four parts per million (referred to national standards). Designed
for use in production environments as well as in calibration laboratories, the 5440
Series Calibrators operate without degradation of uncertainty specifications over a
temperature range of &5"C from the calibration temperature. The 5440 Series can
accurately calibrate meters of up to 7-l/2 digits.
The 5440 Series are convenient to operate. The front panel is tilted to make dataentry
easy, and the two vacuum fluorescent displays are easy to read. A numeric Output
Display shows the output value; a separate, 40-character, Alphanumeric Display
indicates the operating mode, displays menus of operating features, prompts for
entries, and shows other instrument messages.
The 5440 Series are equipped with features that simplify operation. Special features
include:
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You can preset output voltage and current limits, and can preset tolerance limits
for the unit under test.
An automatic lnterual Calibration procedure corrects for drift in internal offsets
and resistor ratios.
A display-prompted, semi-automatic External Calibration procedure corrects for
long-term reference drift.
Output voltage and current levels are automatically monitored.
Output settings can be entered directly with the keyboard and can be incremented
and decremented with convenient front panel controls.
Automatic self-tests check the Calibrator's status and diagnose internal fa,ults.
The IEEE-488 bus address and RS-232-C baud rate can be set from the front panel
keyboard.
There are two models in the 5440 Series: the 544018 and the 5442A., Each model's
features and capabilities are summarized in Table I-1.
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