Steps 8 Through 11: 100 Ohms Measure, Resistance Measure Adjustment - Fluke 7526A-156 Calibration Manual

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.
Calibrator
5522A CALIBRATOR
Figure 15. 100 Ohms Measure, Resistance Measurement Adjustment Connections
STBY
OPR
7 8
4 5
1 2
/ +
0
Precision Process Calibrator
Calibration Adjustment
7526A
7526A PRECISION PROCESS CALIBRATO
VOLTS mA RTD/
100 mA MAX OUTPUT
HI HI
OUTPUT
100V MAX
LO LO
20 V PK
MAX
4 W RTD/
INPUT
HI
CURRENT SENSE
LO
20 V PK
MAX
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