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525B
Users Manual
6-12
Use the 742A-1K for the 400 ohm range. Use the 742A-10K for the 4K ohm
range. For more information on the correct usage of ratio mode, refer to the 8508A
Operators Manual. Use Table 6-7 to note the ratio indication on the 8508A. Use
the formula (742A actual value/ratio indication * 100 = actual 5520A Actual
Value column.
Table 6-7. Ohms Ratio Table
Range
(Ω)
742A
Value (Ω)
Ratio
5520A
Actual
Value (Ω)
525B
Reading
Spec.
90-Day
Spec. (Ω)
1-Year
Spec. (Ω)
400
0 0.002 0.003 0.003
100 0.006 0.0065 0.007
200 0.010 0.010 0.011
300 0.014 0.0135 0.015
400 0.018 0.017 0.019
4000
0 0.02 0.03 0.03
1000 0.06 0.065 0.07
2000 0.10 0.10 0.11
3000 0.14 0.135 0.15
4000 0.18 0.17 0.19
To test ohm input:
1. Apply a four wire short to the 525B 4W RTD Ohm input.
2. Set the 525B to the 400 ohm range. Note the reading.
3. Set the 525B to the 4000 ohm range. Note the reading.
4. Move the 525B 4W RTD Ohm input to the output of the 5520A.
5. Output the same nominal values and note the 525B readings in the 525B
reading column.
6. Subtract the actual 5520A value from the 525B reading and ensure that it is
within the specified tolerance.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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