Measurement Using Scanner; Measurement Procedure - Agilent Technologies 4294A Programming Manual

Application Sample Programs

Measurement using scanner

Measurement using scanner
To perform measurement using the scanner while switching differnet channels,
compensation for each channel must have been done. The 4294A lets you perform
measurement while scanning channels, by making the connection as shown in 4294A and
using functions including the list sweep, reading/writing compensation coefficients, and
the manual sweep.
When performing measurement while scanning channels, you repeat the procedure
"specifying a sweep segment using the manual sweep function → changing channels →
measuring impedance." To make accurate measurement, you need to measure data for each
channel and calculate its compensation coefficient.
To create the compensation coefficient for changing channels, execute the fixture
compensation for each channel, read out compensation coefficients, and combine
necessary part of them. An example is shown below.
Table 13-7 shows a schematic view of creating the scan-aware compensation coefficient.
N+1 channels from 0 through N are used. Set the list sweep table so that the sweep
condition for channel n corresponds to segment n+1. Execute the fixture compensation for
channel 0 and read out the created compensation coefficient. The fixture compensation is
performed for all segments; substitute the part of the read out compensation coefficient that
corresponds to segment 1 into the part of the scan-aware compensation coefficient that
corresponds to segment 1. For the other channels, perform the substitute operation from the
fixture compensation to the scan-aware compensation coefficient. Finally, write the created
compensation coefficient into the 4294A to bring the scan-aware compensation coefficient
to take effect.
Figure 13-7 Example of creating scan-aware compensation coefficient

Measurement procedure

This section describes how to perform measurement while scanning 4 channels, using the
4294A, the Agilent 3499A Switch/Control System, and two 44472A Dual 1×4 RF
Multiplexer Modules.
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