Precision Process Calibrator
Calibration Adjustment
29
Steps 8 through 11: 100 Ohms Measure, Resistance Measure Adjustment
The ohms measure calibration adjustment allows the use of a medium-quality resistor
decade in conjunction with a good-quality DMM by using flexible calibration points.
This way, if resistance standards are not available, the resistor decade can be set to 1 K,
the actual value of the DMM value can be read (1002.45
Ω
for example), and this value
can be entered when asked for 1000
Ω
.
You can use a resistor decade box, adjustable in 25
Ω
to 4000
Ω
range, to cover all of the
values that are requested (maximum 5 % tolerance):
•
25
Ω
•
50
Ω
•
100
Ω
•
200
Ω
•
400
Ω
•
1000
Ω
•
2000
Ω
•
4000
Ω
The subsequent procedure uses the Fluke 5522 for ohms source to adjust the Product
reading. See Table 3 for the test equipment used for this procedure. See Figure 15 for
connections.
CURRENT
OUTPUT
HI
VOLTS
mA
RTD/
OUTPUT
HI
LO
HI
LO
LO
SENSE
4W RTD/
INPUT
20 V PK
MAX
100 V MAX
100 mA MAX
20 V PK
MAX
PRECISION PROCESS CALIBRATO
7526A
0
1
2
4
5
7
8
/
+
OPR
STBY
5522A
CALIBRATOR
7526A
Calibrator
gxm024.eps
Figure 15. 100 Ohms Measure, Resistance Measurement Adjustment Connections
Summary of Contents for 7526A
Page 6: ...7526A Calibration Manual iv ...
