Anritsu ME7840A, Operation And Maintenance Manual, Page: 94 / 126

n Test Set Setting: Byte value for setting test set
attenuation and source switch:
The PATS Hot S
22
measurement provides the following additional fea-
tures:
q Ability to vary the AUT input excitation power level (Source 2 of
Scorpion, at Port 1) while observing the Hot S
22
response. Pressing
“U” on the PC keyboard increases the input excitation power level
(U for up). Pressing “D” decreases it. The actual input excitation
power in dBm is displayed on the PC screen.
q Ability to turn the amplifier input excitation source (Source 2 of
Scorpion, at Port 1) ON and OFF while observing the Hot S
22
. Shift
S turns Source 2 OFF. S turns it ON. This basically provides a com-
parison of “Cold” S
22
with Hot S
22
.
q Ability to capture the Hot S
22
plot at a given excitation level (his-
tory plot on the PC screen) for comparison with other levels. Press
“C” captures (creates history plot). Press “Shift + C” removes it.
q Ability to show Hot S
22
Smith Chart on the Scorpion Screen while
Log Magnitude is displayed on the PC screen. The Scorpion display
can be selected by Scorpion front panel controls during the mea-
surement.
The level of the tone injected to the output of the AUT (Source 1 of Scorpion,
at Port 2) can be set by the user via the “Specification File”.
OPERATIONS, MEASUREMENT HOT S22
ME7840A OMM 5-33
Internal Source Value External Source Value
0 dB 8 0 dB 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