2-3-3, USING THE COMPARATOR FUNCTION
The following procedure will give you practice using the 4278A's comparator function. Per-
form this procedure without changing the measurement settings established in the previous
procedure.
1. Press the MENU key to reset the softkey labels to the initial page.
2, Press the NEXT key twice.
3. Press the 'COMPARATOR' and 'LIMIT TABLE' softkeys to display the limit table.
4. Press the 'CLEAR LIMIT' softkey and the ENTER key to initialize the limit table.
5_ Press the 'CHANGE PARMTR' softkey. Press the `Cp-G' softkey, then press the
`return' softkey.
6. Observe the upper-left corner of the display and press the 'REVERS PARMTR' soft-
key. Note that each time you press the 'REVERS PARMTR' softkey, the primary and
secondary parameters switch positions. Reset the displayed parameters to Cp-G.
7. Press the 'LIMIT MODE' softkey. This allows you to select from three sorting meth-
ods, For this example, leave the sorting method set to % TOL, as it is now. Basical-
ly, the % TOL method sorts capacitors into plus and minus percentages from a
NOMINAL value that must be input by you. Refer to Section 3 for details. Press the
`return' softkey.
8. Confirm that the cursor is in the Nom : field (top LCD line). Enter the NOMINAL
capacitance value (in this case, 4.8n9 using the numeric ENTRY keys, the 'nF' soft-
key, and the ENTER key.
9. The cursor automatically moves to the BIN 1 row of the limit table. Press the 1 key,
then press the ENTER key. The LOW and the HIGH limits of BIN 1 will be set to -1%
and +1%, respectively, and the cursor moves to the BIN 2 row.
10. Set BIN 2 to ±2%, BIN 3 to ±5%, BIN 4 to ±10%, BIN 5 to ±20%, and BIN 6 to
±50% in the same manner.
11. Confirm that the limit table is as shown in Figure 2-6, then press the 'exit LIMIT'
softkey.
2.10
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