HP 8712ET User Manual page 247

Step 2: Create a
User-Defined
Calibration Kit
These effects are impossible to eliminate, but the
calculation built into the analyzer includes an
open-circuit capacitance model. This capacitance model
is a third-order polynomial as a function of frequency,
where the polynomial coefficients are user-definable.
The capacitance model equation is: C(f) = (C
+ (C
frequency.
The terms in the equation are defined when specifying
the open as follows:
• C
• C
• C
• C
For further information on calibration kits and determining standard
characteristics, refer to HP Product Note 8510-5A (HP Publication
No. 5956-4352). To view this product note on the Web, go to
http://www.tmo.hp.com and select "Application Note Library."
A user-defined calibration kit can be created by either of these two
methods:
• Method A: use the softkeys under the Modify Kit menu.
This method provides a convenient and quick way to modify
calibration kit standards. Use this method during the development of
new calibration kit standards.
• Method B: use an ASCII file.
This method provides a way to manage calibration kit descriptions in
separate files. Use this method to keep permanently filed descriptions
of your calibration kits.
ET User's Guide
Calibrating for Increased Measurement Accuracy
2 3
*f ) + (C *f ) where f is the measurement
2 3
is used to enter the C
0
constant term of the third-order polynomial and is
expressed in Farads.
is used to enter the C
1
(Farads/Hz).
is used to enter the C
2
is used to enter the C
3
Calibration Kits
) + (C
0
term, which is the
0
term, expressed in F/Hz
1
term, expressed in F/Hz
2
term, expressed in F/Hz
3
*f)
1
2
.
3
.
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