Agilent Technologies 4294A, Programming Manual

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13 231
Application Sample Programs
Measurement using scanner
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Programs
performed here. Because the phase compensation is common to all the channels, perform it
for one channel. For the phase compensation, you need to bring the measurement terminal
into the open state as shown in Figure 13-10.
Figure 13-10 Open state
Step 3. Setting the measurement conditions
Set the list sweep table. Set the sweep condition for each channel for each segment. In this
sample program, the sweep conditions from channels 0 through 3 are assigned to segments
1 through 4.
Step 4. Reading out the compensation coefficient of the fixture compensation
For each channel, perform the open, short and load fixture compensations. For the load
compensation, use a working standard whose value is known. Data measurement for the
compensation coefficient is performed for all segments. After calculating the
compensation coefficient, read out the compensation coefficient for each channel.
Step 5. Creating the scan-aware compensation coefficient
From the compensation coefficient array read out in Step 4, combine the segments that
correspond to individual channels to create the scan-aware compensation coefficient.
Step 6. Executing impedance measurement
Change the sweep range of the manual sweep and the channels and perform impedance
measurement for the multiple channels.
Sample program
Example 13-6 shows a sample measurement program assuming that it is used in a scanning
system (4 channels). This program is stored in the sample program disk as scan.bas.
Lines 70 to 170 Identifies the external controller and Instrument BASIC and sets the
GPIB address and select code.
Lines 200 to 230 Prepares data for the list sweep table using DATA statements.
Segments correspond to channels 0 to 3 from the top.
Lines 250 to 300 Assigns the measurement conditions (adapter setting: 2-m test lead,
measurement parameter: |Z|-q, sweep type: LIST, oscillator power
level setting unit: VOLT, and DC bias setting unit: VOLT) into the