4957D/E/F Microwave Analyzer Quick Start Guide
9
Chapter III Typical Applications
4957D/E/F offers a variety of measurement modes. This chapter will provide a detailed
introduction to commonly used test cases in each mode.
3.1 Calibration in the VNA Mode
In order to ensure the accuracy of the measurement results, the instrument must be
calibrated before testing to eliminate the systematic error of the analyzer. 4957D/E/F
adopts mechanical calibration method with the process is as follows:
1. Frequency response error correction
You can eliminate the frequency responses of the following measurements for measured
test component assembly:
Reflection measurement
Transmission measurement
a) Frequency response error correction of reflection measurement
1) In the VNA mode, select the desired type of measurement:
If reflection measurement is required at port 1 (positive, S11), keep the default
setting of the instrument.
If reflection measurement is required
at port 2 (reverse, S22), press [Measure] →
[S22].
2) Set other parameters of the equipment measurement: Start Freq, Stop Freq, Power,
Points or IF BW, etc..
3) Press [Cal] to open the calibration menu.
4) Press [Cal Kit] to see if the calibration kit is consistent with the kit specified with the
current soft key. If not, press the corresponding soft key to select the correct
calibration kit model.
5) Press [OK], return to the menu bar of [Cal], select the frequency response error
correction function, press [M Cal>] → [Freq Resp>] → [OPEN S11>], and the system
will automatically prompt "Connect OPEN in P1, then press corresp. menu button to
start!" then connect the open circuit device to port 1 selected as the test port.
6) After the display trace is stable, to measure the standard piece, press [OPEN], the
analyzer will display "calibration standard measurement …" during the measurement
of the standard piece, and after completing the measurement and calculating the
error coefficient, it will display the prompt "Press [Done] to complete the
measurement!" And the software menu will be underlined to indicate that the project
has been tested, such as [OPEN].
7) Press [Done] to complete the error correction of reflection measurement, which
allows for connection and measurement of the DUT.
8) Similarly, repeat step 5), select another frequency response error correction function,
press [M Cal>] → [Freq Resp.>] → [SHORT S11>] or [OPEN S22>] or [SHORT
S22>], and connect an open circuit or a short circuit device at the corresponding test
port according to different prompts to perform steps 6) and 7).
The standard allows only one standard piece to be measured. If a
wrong key is pressed when selecting a standard piece, return to
[Cal] → [M Cal] → [Freq Resp.] and select the correct standard
piece. Do not use the standard pieces of the circuit closer in
reflection response correction.
Note
