Agilent Technologies 4294A Service Manual download pdf (Page 63)

Chapter 4 63

Preparing For Accurate Measurement

Fixture Compensation

1. Chapter Title

2. Chapter Title 3. Chapter Title

4. Getting Ready For

5. Chapter Title

Accurate Measurement

Fixture Compensation

To turn on or off the open/short/load compensation of the fixture compensation functions,

use the command given below. You can set open/short/load compensations independently.

However, if no compensation coefficients are retained, the functions cannot be turned on.

• “COMST{A|B|C}” on page 282

To measure open data, short data and load data for calculating compensation coefficients in

open/short/load compensation of the fixture compensation functions, use the commands

given below. Executing these commands calculates fixture compensation coefficients of

measured data and stores them in volatile memory (RAM). In addition, the compensation

function for measured data is turned on.

• “COM{A|B|C}” on page 281

NOTE User calibration data and fixture compensation data are measured either at fixed points

preset by the Agilent 4294A (fixed measurement points) or at sweep measurement points

set at the time of command execution (user-selected measurement points). In the case of

the former, the compensation coefficient at a sweep measurement point is obtained by

interpolation. To select points for measuring data, use the “CALP” command on page 275.

To set standard values to be used in measuring these data, use the commands given below.

• “DCOMOPEN{G|C}” on page 293

• “DCOMSHOR{R|L}” on page 294

• “DCOMLOAD{R|L}” on page 292

To read open data, short data or load data measured, use the command given below.

• “OUTPCOMC{1-3}?” on page 374

You can calculate fixture compensation coefficients by entering open data, short data and

load data (data read by the above or similar command). To enter data, use the command

given below. Executing these commands calculates the fixture compensation coefficients

of measured data and stores them in volatile memory (RAM). In addition, the

compensation function for measured data is turned on.

• “INPUCOMC{1-3}” on page 321

NOTE Enter data after setting the standard values used in measuring the data because these values

are needed to calculate fixture compensation coefficients.

NOTE Enter data after making settings identical to the data measurement points (fixed

measurement points, user-selected measurement points) set at the time when the input data

were acquired. In addition, in the case of the user-selected measurement points, enter data

after making the sweep settings identical to the data measurement points.

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Agilent Technologies 4294A Service Manual Page 63