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Chapter 4
Operations, Calibration
4-1 INTRODUCTION Measurements always include a degree of uncertainty due to imperfec
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tions in the measurement system. The measured value is always a combi
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nation of the actual value plus the systematic measurement errors. Cali
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bration, as it applies to network analysis, characterizes the systematic
measurement errors and subtracts them from the measured value to ob
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tain the actual value. Each of the ME7840A measurements requires a cal
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ibration to account for measurement uncertainties. This chapter de
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scribes the measurement calibration operations of the Model ME7840A
Power Amplifier Test System software.
4-2 OPERATION,
GENERAL
Refer to Chapter 3 for general operation and setup of the ME7840A.
4-3 PROGRAM FILES The PATS software sets up the MS462XC DRA Scorpion according to in-
structions in the “Calibration Specification” files, which are accessed from
the “Tools,” “Run Calibration Procedure” function that is described later
in this chapter. These are user-editable text files that establish the condi-
tions during calibration and measurement. How to edit these files is de-
scribed in Appendix A.
The calibration data and Scorpion switch settings that result from follow
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ing a “Run Calibration Procedure” specification file are saved as a *.cal
file. These *.cal files are accessed using the “Tools,” “Calibration File Op
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tion” function that was described in paragraph 3-6, page 3-8. When one
of these files is recalled using the “Calibration File Option,” the Scorpion
is ready to acquire correct (calibrated) measurements.
Examples of instrument settings / conditions that reside in the Calibra
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tion Specification files include:
q
Sweep start and stop frequencies
q
Number of data points
q
Source 1 and 2 power levels
q
Scorpion IF bandwidth
q
Averaging
q
Scorpion display settings
Some of these parameters can also be specified / modified by the User In
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put window before each actual measurement so long as such modification
is consistent with the calibration to be applied.
ME7840A POM 4-1