Fluke 7526A - Steps 8 through 11: 100 Ohms Measure, Resistance Measure Adjustment

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
20V PK
MAX
100 V MAX
100 mA M A X
20V PK
MAX
PRECISION PROCESS CALIBRAT
O
7526A
0
1
2
45
7
8
/
+
OPR
STBY
5522A
CALIBRATOR
7526A
Calibrator
gxm024.eps
Figure 15. 100 Ohms Measure, Resistance Measurement Adjustment Connections