Agilent Technologies 4294A Programming Manual page 191

Step 3. Perform the adapter setup function
Select 4TP 1M as the adapter, measure the phase data for calculating the setup data,
calculate the setup data, and store it into the nonvolatile memory.
NOTE
For details on how to set up the adapter when connecting the 16451B, refer to "Preparing
Accessories for Measurement" in the 4294A Operation Manual.
Step 4. Adjust the electrodes
To enhance the measurement performance, a mechanism is provided to adjust the guarded
and unguarded electrodes to be parallel to each other. By performing this adjustment, the
occurrence of the airgap when using the contacting electrode method is minimized and an
airgap with uniform thickness is created when using the non-contacting electrode method.
The adjustment procedure is discussed in the operation manual of the 16451B.
Step 5. Specify the measurement conditions
Specify the measurement conditions including the measurement frequency and the
measurement signal level.
Step 6. Execute fixture compensation
Execute OPEN/SHORT compensation to compensate the residual impedance of the
16451B. Measure OPEN/SHORT compensation data using the furnished attachment that
comes with the 16451B to make OPEN/SHORT condition.
If the measurement frequency exceeds 5 MHz, you must perform LOAD compensation in
addition to OPEN/SHORT compensation. Use an air capacitor (adjust the distance between
the electrodes to obtain the value in the following table) as the standard when measuring
the LOAD compensation data. As the standard value for LOAD compensation, use the
equivalent parallel capacitance value (Cp) measured at a low frequency (100 kHz). (It is
assumed that the air capacitor has no dependence on frequency.)
Electrodes
A
B
C and D
NOTE
The 4294A does not allow you to define the LOAD standard using the values Cp and G.
Therefore, you must use the OPEN standard and the LOAD standard inversely. To be more
specific, first, define the OPEN standard value as the LOAD standard and the LOAD
standard value as the OPEN standard, and then use the connection for LOAD measurement
when executing the OPEN measurement command and use the connection for OPEN
measurement when executing the LOAD measurement command. For details, refer to the
4294A Operation Manual.
Actual measurement procedure for the LOAD standard (OPEN compensation data) is as
follows: Adjust the distance between the 16451B's electrodes, measure Cp at 100 kHz, and
sets it as the OPEN compensation standard value (Cp: measured value and G: 0). Then, by
maintaining the distance between the electrodes, measure data as the OPEN compensation
data at the frequency points where you want to measure the material (execute the OPEN
compensation data measurement command).
13
Value of Load (Air Capacitor)
50 pF ± 0.5 pF
5 pF ± 0.05 pF
1.5 pF ± 0.05 pF
Application Sample Programs
Measuring Dielectric Material
191