2-3-2. STANDARDS COMPENSATION
To compensate the 4278A for performing measurements against a working standard, con-
firm that softkey label page 2/4 is displayed in the lower right-hand corner of the LCD, and
perform the following procedure.
Assuming that you used the capacitor mentioned at the beginning of the previous pro-
cedure, your measurement result should be approximately 4.7nF. Let's further assume that
you measured this capacitor as 4.8nF using another capacitance meter, and that this reading
is your working standard. The 4278A allows you to perform standards compensation to
match the 4278A's reading to that of your working standard. Perform the following pro-
cedure without changing the measurement settings established in the previous procedure.
NOTE
When standards compensation is performed, 4278A capacitance measurement
results are referenced to the working standard, so 4278A measurement accuracy
is not applicable.
1. Press the 'COMPEN' softkey, then press the PREV key twice.
2. Press the 'STD PARMIR' and 'C-G' softkeys. Press the 'return' softkey.
NOTE
In this example, assume that the working standard's Cp-G measurement values
are 4.8nF and 011S.
3. Press the 'STD ENTRY' softkey. Press the `C=' softkey and press the 4.8 numeric
keys. Press the 'nF' softkey, then the ENTER key to enter the reference capacitance.
4. Press the 'G=' softkey and enter the conductance reference value (04S) as in step 3
above. Press the 'return' softkey.
5. Press the PREV key and 'STD COMPEN' softkey, and observe the display. The
message "Std. compensation completed" will be displayed on the Message Line and
the working standard's measurement result will be displayed on the Monitor Line.
6. Press the 'STD ON' softkey and the TRIGGER key. The measurement result will be
very close to 4.8nF.
7. To continue with the next practice exercise, leave the 4278A's control settings as
they are now, and proceed.
2-9
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