Specifications

66 Chapter 3

Setting Measurement Conditions

Example program for setting the segment sweep conditions

An example program for setting the segment sweep conditions is described below. This

program sets the segment sweep conditions as follows after resetting the E4991A. When

the setting is complete, a completion message is displayed.

Example program using HTBasic

The program shown in Example 3-3 is saved under the filename segm_set.htb on the

sample programs disk. The details of this program are explained as follows.

Line 60 Sets the GPIB address of the E4991A.

Lines 80 - 100 Substitutes a variable for the total number of segments to be created.

In addition, substitutes variables for the oscillator level and the setting

units of the dc bias. However, when the dc bias function is not installed

in the E4991A, enters “OFF” for the variable Dcbias_units$.

Line 140 Resets the E4991A.

Lines 150 - 180 Creates a segment in the segment sweep table and displays the table.

In addition, sets the setting units of the oscillator level.

Line 200 Branches the program for either the condition in which the dc bias

function is installed or that in which it is not installed in the E4991A.

Lines 250 - 270 Declares the parameters (start/stop frequency, number of measurement

points, point averaging factor, oscillator output level, dc bias output

voltage level, and dc bias current limit maximum value) that are

necessary for setting the segment sweep table.

Line 290 Sets the dc bias setting units for creating the segment sweep table.

Lines 300 - 340 When the dc bias function is installed, reads the setting parameters

necessary for creating the segment sweep table while looping for the

total number of segments in the section and then provides the setting

parameters to the sub-program.

Lines 400 - 480 When the dc bias function is not installed, calls the sub-program to

create the segment sweep table in this section.

Segment sweep table setting item Segment 1 Segment 2 Segment 3

Start frequency 1 MHz 100 MHz 1 GHz

Stop frequency 100 MHz 1 GHz 3 GHz

Number of measurement points 101 101 51

Oscillator output level 100 mV 100 mV 100 mV

dc bias output voltage level 10 V 10 V 10 V

dc bias current limit maximum value 10 mA 10 mA 10 mA

Number of point averaging 32 4 4

Sweep type Segment sweep

Delay time at each segment 0.1 sec

X-axis span display format Each segment