5560A/5550A/5540A
Service Manual
12
RDS Method
Another guardbanding method that is the root difference of squares method. The test limit for this
method is defined as:
This method makes a less aggressive guardband while it still provides sufficient confidence in the
measurement result for most quality standards. The determination of pass and conditional pass is
generally used for this method in the same manner as the ILAC G8 method. The RDS method is used
widely at Fluke Calibration and other companies as a reasonable approach to ensure confidence that
the verified Product meets its published specifications.
This is not an all-inclusive list of guardbanding strategies. The method selected must meet the quality
system requirements of the owner of the Product being calibrated. The best uncertainty attainable at
some test points can be relatively large as compared to the specification. Fluke Calibration
recommends that when making conformity assessment decisions of in or out of tolerance to published
specifications during performance verification, the uncertainties of measurement should be evaluated
and appropriate guardbanding rules should be applied to have sufficient confidence in the calibration
results.
Volts DC Calibration (OUTPUT VZ)
Table 2 lists the required equipment.
To calibrate the Volts dc function from the main output:
1. On the Fluke Calibration 8588A put a 4-wire short (Fluke PN 2540973) across the HI and LO input
and sense terminals.
2. Set the 8588A as follows: Volts dc, Range Auto, NPLC 50, Guard ON (external guard)
3. Push ZERO, and then ZERO FUNC. Allow the zero function to finish.
4. Make sure that the DUT (Device Under Test) is in Standby.
5. Complete an internal DC Zero Calibration on the Product.
6. Record the 732C standard values in the Vstd column.
7. Connect the 8588A for vdc measurement with the low thermal cable to the 732C 100 mV (normal
polarity).
8. Record the 8588A measurement in the Vdmm_732C column for applicable steps.
9. Inverse the cable at the 732C 100 mV (negative polarity).
10. Record 8588A measurement in the Vdmm_732C column for applicable steps.
Table 2. Required Equipment for Volts DC (Normal Output)
Equipment Description Manufacture/Model/PN Quantity
Digital Multimeter Fluke Calibration 8588A 1
DC Reference Standard Fluke Calibration 732C 1
Fluke 8508A short 4-wire short (Fluke PN 2540973) 1
Low Thermal Cables 5730A-7003 1
Test Limit= √ (Specification limit)
2
- (Expanded Uncertainty of Measurement)
2
To Next Page
Loading...
