Agilent Technologies 4294A Service Manual download pdf (Page 193)

13 193

Application Sample Programs

Measuring Dielectric Material

1. Chapter Title

2. Chapter Title 13. Application Sample

4. Chapter Title

5. Chapter Title

Programs

Sample Program for Contacting Electrode Method

Example 13-2 shows a sample program to measure dielectric materials (contacting

electrode method) (for HP Instrument BASIC). You can find the source file of this

program, named permi_c.bas, on the sample program disk.

The steps to use the program are described below:

Step 1. Connect the 16451B dielectric test fixture to the 4294A, and start this program. When the

message “Which electrode of 16451B is used? 0:A, 1:B, 2:C, 3:D” is displayed, select the

electrodes you want to use by specifying the corresponding number (0 to 3).

Step 2. When the message “Perform the adapter setup? 0:Yes, 1:Skip” is displayed, enter 0 if you

want to set up the adapter.

Step 3. When the message "Set the 16451B OPEN condition and press 'Continue'.” is displayed,

bring the 16451B into OPEN condition and press the

Continue key (2nd softkey from the

top). The phase data for calculating the setup data will be measured.

Step 4. When the message “Set the micrometer of 16451B at 10um and press 'Continue'.” is

displayed, turn the small knob of micrometer and adjust it until the micrometer indicates

μm and press the Continue key. (Steps 4 and 5 are required only when the electrodes

you use are A or B.)

Step 5. When the message “Adjust the electrode until PASS is displayed” is displayed, turn the

three adjustment screw (under the unguarded electrode) to adjust the electrodes to be

parallel until the limit test results display PASS, and press the

Continue key.

Step 6. When the message “Start frequency [Hz] = ?” is displayed, enter the frequency at the

sweep start point. In the same way, enter the frequency at the sweep stop point, the sweep

type, the signal source level, and the number of measurement points. When you have

completed all entries, they are displayed followed by the message “Measurement condition

is OK? 0:OK, 1:NO”. If you find no mistake, enter 0.

Step 7. When the message “Turn the micrometer's knob until PASS is displayed.” is displayed,

turn the 16451B’s knob to adjust the distance between the electrodes until the limit test

results display PASS (so that the air capacitor used as the LOAD standard becomes an

appropriate value), and press the

Continue key.

Step 8. When the message “Set the 16451B OPEN condition and press 'Continue'.” is displayed,

bring the 16451B into OPEN condition and press the

Continue key.

Step 9. When the message “Set the 16451B SHORT condition and press 'Continue'.” is displayed,

bring the 16451B into SHORT condition and press the

Continue key.

Step 10. When the message “Thickness of MUT [mm] = ?” is displayed, enter the thickness of the

dielectric material (MUT) you want to measure. If you use electrode C or D, when the next

message “Diameter of electrode [mm] = ?” is displayed, enter the electrode diameter.

Step 11. When the message “Set MUT between the electrodes and press 'Continue'.” is displayed,

insert the MUT between the electrodes and press the

Continue key to measure the

equivalent parallel capacitance (Cp) and the dissipation factor (D).

Step 12. When the message “Select softkey to display each parameter.” is displayed, press the

softkey for the parameter you want to display on the screen.

Figure 13-5 shows an example

of the screen display when selecting the real part of the complex relative permittivity (er')

and the dielectric dissipation factor as displayed parameters. At this time, pressing the

“Quit” softkey terminates the program and pressing the “Re-measure” softkey lets you

repeat the procedure from Step 10.

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