Agilent Technologies 4294A Service Manual download pdf (Page 68)

68 Chapter 4

Preparing For Accurate Measurement

Fixture Compensation

Example 4-4 shows a sample program that takes in data for use in fixture compensation.

This sample program is given the file name com_inpu.bas and is stored on the sample

program disk.

This program reads open data, short data and load data from the files (COM_DATA and

STD_VAL) retained by the program shown in

Example 4-3 and sets them.

Lines 50 to 140 These lines distinguish between the external controller and Instrument

BASIC and set the GPIB address and the select code. In the case of

Instrument BASIC, flash memory is used as the storage unit.

Lines 150 to 180 These lines substitute the selection of data measurement points, the

number of compensation data measurement points (100 for fixed

measurement points), the name of the file for reading compensation

data, and the name of the file for reading standard value to the

variables Cal_point$, Point, File$ and Std_file$, respectively.

Lines 220 to 250 These lines reset the Agilent 4294A and then assign the data

measurement points to Cal_point$.

Lines 290 to 310 These lines read open data, short data and load data from the file

named File$ in the sequence shown in

Example 4-3 to store them in

the arrays Com_o(*), Com_s(*), and Com_l(*), respectively.

Lines 330 to 350 These lines read open/short/load standard values from the file named

Std_file$ in sequence as written in

Example 4-3 and store them in the

variables Open_g, Open_c, Short_r, Short_l, Load_r, and Load_l

respectively.

Lines 390 to 440 These lines set the standard values. The open standard capacitance

needs to be in femtofarad, so these lines make the necessary

conversion.

Line 480 This line selects the IEEE 64-bit floating-point format for the data

transfer format.

Line 490 This line calculates data size from the program variable Point and

creates a header to be used at the time of data transfer.

Lines 510 to 580 These lines enter data for open/short/load compensation. When the

data are entered, the open/short/load compensation of the fixture

compensation functions is turned on.

Example 4-4 Data entry for fixture compensation

10 DIM Header$[9],Cal_point$[9],File$[20],Std_file$[20]

20 DIM Com_o(1:100,1:2),Com_s(1:100,1:2),Com_l(1:100,1:2)

30 REAL Open_g,Open_c,Short_r,Short_l,Load_r,Load_l

40 INTEGER Scode,Point

50 IF SYSTEM$("SYSTEM ID")="HP4294A" THEN

60 ASSIGN @Hp4294a TO 800

70 ASSIGN @Binary TO 800;FORMAT OFF

80 MASS STORAGE IS ":INTERNAL1,5"

90 Scode=8

100 ELSE

110 ASSIGN @Hp4294a TO 717

120 ASSIGN @Binary TO 717;FORMAT OFF

130 Scode=7

140 END IF

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Agilent Technologies 4294A Service Manual Page 68

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