A40B
Instruction Manual
20
Calibration
Introduction
This section of the manual describes the calibration of the Current Shunts. The
description is presented in two parts:
1.
An overview/discussion of the considerations for calibration of Current Shunts.
2.
A description of the Fluke Calibration Method.
Neither of the descriptions contains detailed step by step procedures for calibrating the
Current Shunts. Rather, the descriptions are meant to provide a foundation for the
seasoned calibration technician to work with and use the Fluke method of calibrating
Current Shunts.
An Overview of Calibration Methods
Current Shunts can be used in AC-DC difference or absolute AC or DC measurements.
This requires that both AC flatness and DC resistance performance are calibrated. Both
AC and DC calibration involves passing a known current through the device being
calibrated (UUT) and measuring the voltage output.
The Fluke calibration method for the Current Shunts is to transfer calibration against
reference shunts. This eliminates the need for a calibrated current source. However, the
source current must be stable and able to provide the necessary voltage compliance
levels. Figure 5 shows the basic configuration.
Rs
UUT
sh
u
nt
Ref
Std
sh
u
nt
I
V
meas
u
rement
V
meas
u
rement
V
so
u
rce
ZL
ZL
feh014.eps
Figure 5. Circuit Using a Reference Shunt Resistor to Determine Source Current
Summary of Contents for A40B
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