3-10. COMPARATOR
The 4278A's built-in comparator can sort capacitors into a maximum of ten bins (Bin 1 to
Bin 9 and one Out of Bins bin) using a maximum of nine pairs of primary parameter limits
and one pair of secondary parameter limits. Also, capacitors whose primary parameter
measurement result is within limits, but whose secondary parameter measurement result not
within limits, can be sorted into an AUXiliary BIN. The comparator function is especially
useful when using the 4278A with a component handler (handier interface option is
installed).
3-10-1. LIMIT PARAMETERS
Limit parameters are pairs of measurement parameters for bin sorting comparisons. Limit
parameters are established on the limit table and are independent from the set MEASure-
ment PARaMeTeR. The first limit parameter is the Primary Parameter, for which a maximum
of nine pairs of comparison limits can be set. The last limit parameter is the Secondary
Parameter, for which one pair of comparison limits can be set. Usually, Cp or Cs is set as
the Primary Parameter, and either D, 0, G, or ESR is set as the secondary parameter. When
the 'REVRES PARMTR' softkey is pressed, the primary and secondary parameters switch
positions. Figure 3-10 shows the limit parameters.
Figure 3-10. Limit Parameters
3-10-2. LIMIT MODES
There are two methods for specifying primary parameter limits, as follows.
Tolerance Mode: Specifies comparison limits by the deviation from the specified
nominal value.
Sequential Mode: Specifies comparison limits as the absolute measurement value.
The limits must be set from smallest value to largest value.
3-18
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