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Chapter 5
Operations, Measurement
5-1 INTRODUCTION This chapter describes the five measurements available with the
ME7840A software: S-Parameters, Power Sweep, IMD (intermodulation
distortion), Harmonics, and Hot S
22
.
5-2 OPERATION,
GENERAL
Refer to Chapter 3 for general operation and setup of the ME7840A.
5-3 MEASUREMENT
CALIBRATION
Measurements always include a degree of uncertainty due to imperfec
-
tions in the measurement system. The measured value is always a combi-
nation of the actual value plus the systematic measurement errors. Cali-
bration, as it applies to network analysis, characterizes the systematic
measurement errors and subtracts them from the measured value to ob-
tain the actual value. Each of the ME7840A measurements requires a cal-
ibration to account for measurement uncertainties. Refer to Chapter 4 for
measurement calibration procedures.
5-4 GENERAL Measurements can be approached from two directions: calibration(s) com-
pleted, calibration(s) not completed.
Calibration(s)
Completed
Proceed as follows:
Step 1. Click on “Tools,” and open “Check Communications to VNA.”
Step 2. Verify the communications are correct.
Step 3. Click on “Tools,” and open “Calibration File Options.”
Step 4. Click on “Find and Recall” and recall a *.cal file for each mod
-
ule. Filenames are listed below and shown in graphic below
last listing.
n
S Parameters: “S_Parameters_1.cal”
n
Power Sweep (2T): “PowSweep_1.cal”
n
Power Sweep (1T): “PSweep1T_1.cal”
n
C3, IMD: “Imd_1.cal”
n
C4, Harmonics: “Harmonics_1.cal”
ME7840A OMM 5-1