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Basic Operations for RF Devices Measurement
STEP 6. Fixture Compensation
STEP 6. Fixture Compensation
The E4991A has a specified measurement accuracy at the 7-mm terminal (calibration
reference plane) of a test head. However, in actual measurement, a measurement circuit
(test fixture) is placed between the DUT connection terminal and the 7-mm terminal, and
the influence of this circuit is included in the measurement result as a part of the DUT.
Therefore, fixture compensation must be performed to remove the parasitic error that exists
between the DUT connection terminal and the 7-mm terminal.
This section describes fixture compensation by using the 16197A as an example. When
using other test fixtures, follow the procedure described in the Operation Manual of the
test fixture.
Procedure for Using Mouse and Keyboard
Measuring OPEN Compensation Data (16197A)
Perform OPEN compensation to correct stray admittance due to the test fixture.
Step 1. Set the DUT connection terminal of the test fixture to the OPEN state by following the
procedure illustrated in Figure 3-47. When using other test fixtures, follow the procedure
described in the Operation Manual of the test fixture.
Figure 3-47
OPEN state (16197A)
Chapter 3
73
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