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5-5 S-PARAMETER TESTS:
S
21
,S
11
,S
22
,S
12
, ALL
This test measures the scattering parameters (S-parameters). The test
module comprises six tests: S
11
,S
12
,S
21
,S
22
, and ALL. (The K Factors
test is described in paragraph 5-6.) In each case, the measurement
screens are the similar. This procedure will present a test screen for the
“S
21
” measurement and will describe certain differences at the end of the
procedure.
Procedure.
Prepare the ME7840A as shown in Chapter 3.
Enter the appropriate test values in the displayed
User Input screen. The input fields are described
below: The inputs required for this test are de
-
scribed below.
n
S-Parameter: Drop down options. Set to S
21
for
this procedure. Other selections include S
11
,S
12
,
S
22
, ALL, and K Factor (paragraph 5-6).
n
Data Points: Drop down options - number of data
points in frequency sweep.
n
Frequency 1 (MHz): Lower frequency or start fre-
quency.
n
Frequency 2 (MHz): Upper frequency or stop fre-
quency.
n
Input Power (dBm):Input power level, in dBm.
n
IF Bandwidth (Hz):Intermediate frequency band-
width for test, in Hertz.
n
Test Set Setting: Byte value for setting test set
attenuation and source switch (below).
S-PARAMETERS OPERATIONS, MEASUREMENT
5-4 ME 7840A OMM
Internal Source Value External Source Value
0dB 8 0dB 0
10 dB 9 10 dB 1
20 dB 10 20 dB 2
30 dB 11 30 dB 3
40 dB 12 40 dB 4
50 dB 13 50 dB 5
60 dB 14 60 dB 6
70 dB 15 70 dB 7