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How to Handle a "Which Ever is Greater" Tolerance
This procedure shows an example of how a specification that is 0.1% of reading or 0.2pf, whichever is greater, can be handled in MET/CAL software.
Fluke - San Diego MET/CAL Procedure
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INSTRUMENT: Greater of two tolerances example
DATE: 2001-10-18
AUTHOR: Fluke Corporation
REVISION:
ADJUSTMENT THRESHOLD: 70%
NUMBER OF TESTS: 1
NUMBER OF LINES: 45
CONFIGURATION: Fluke 5520A
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STEP FSC RANGE NOMINAL TOLERANCE MOD1 MOD2 3 4 CON
#
# This procedure shows an example of how a specification that is
# 0.1% of reading or 0.2pf, whichever is greater can be handled in
# Met/Cal ver 6.10
#
#
# set the 5520 up to source capacitance
1.001 5520 200pF S 2W
# also places the actual output from the 5520 into MEM1
# prompts the operator for a value
1.002 MEMI enter the meter capacitance value in pf's
# then places it into MEM
# calculate the % error and places it in M[20}
1.003 MATH M[20]= (.1/100) * mem
#1.004 math places the >pF value in M[21]
1.004 MATH M[21]=.2
#1.005 math determine which value is larger
1.005 MATH M[22]=MAX(20,21)
# or use alternate math statement
# 1.006 MATH M[22]=MAX2((0.1/100) * MEM,.2)
#1.006 MEMCX compares the value in MEM (UUT) TO MEM1 (REFERENCE)
# using M[22] as the tolerance in units
1.006 MEMCX pf M22U
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