Agilent Technologies 4294A Service Manual download pdf (Page 191)

13 191

Application Sample Programs

Measuring Dielectric Material

1. Chapter Title

2. Chapter Title 13. Application Sample

4. Chapter Title

5. Chapter Title

Programs

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.)

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).

Electrodes Value of Load (Air Capacitor)

A 50 pF ± 0.5 pF

B 5 pF ± 0.05 pF

C and D 1.5 pF ± 0.05 pF

1 2 ... 186 187 188 189 190 191 192 193 194 195 196 ... 517 518

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Agilent Technologies 4294A Service Manual Page 191

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