Rohde & Schwarz FSW13, User Manual

Page: 371 / 1150

Common Measurement Settings
R&S
®
FSW
371 User Manual 1173.9411.02 ─ 19
Signal ID
Activates or deactivates visual signal identification. Two sweeps are performed alter-
nately. Trace 1 shows the trace measured on the upper side band (USB) of the LO (the
test sweep), trace 2 shows the trace measured on the lower side band (LSB), i.e. the
reference sweep.
Note that automatic signal identification is only available for measurements that per-
form frequency sweeps (not in vector signal analysis or the I/Q Analyzer, for instance).
(See also "Automatic Signal Identification" on page 362).
Mathematical functions with traces and trace copy cannot be used with the Signal ID
function.
Remote command:
[SENSe:
​
]MIXer:
​
SIGNal
​
on page 869
Auto ID
Activates or deactivates automatic signal identification.
Auto ID basically functions like Signal ID . However, the test and reference sweeps are
converted into a single trace by a comparison of maximum peak values of each sweep
point. The result of this comparison is displayed in trace 3 if "Signal ID" is active at the
same time. If "Signal ID" is not active, the result can be displayed in any of the traces 1
to 3. Unwanted mixer products are suppressed in this calculated trace.
Note that automatic signal identification is only available for measurements that per-
form frequency sweeps (not in vector signal analysis or the I/Q Analyzer, for instance).
(See also "Automatic Signal Identification" on page 362).
Remote command:
[SENSe:
​
]MIXer:
​
SIGNal
​
on page 869
Auto ID Threshold
Defines the maximum permissible level difference between test sweep and reference
sweep to be corrected during automatic comparison (
"Auto ID" on page 371 function).
The input range is between 0.1 dB and 100 dB. Values of about 10 dB (i.e. default set-
ting) generally yield satisfactory results.
(See also "Automatic Signal Identification" on page 362).
Remote command:
[SENSe:
​
]MIXer:
​
THReshold
​
on page 869
Bias Settings
Define the bias current for each range, which is required to set the mixer to its optimum
operating point. It corresponds to the short-circuit current. The bias current can range
from -10 mA to 10 mA. The actual bias current is lower because of the forward voltage
of the mixer diode(s).
The trace is adapted to the settings immediately so you can check the results. To store
the bias setting in the currently selected conversion loss table, select the
Write to <CVL
table name> button.
Remote command:
[SENSe:
​
]MIXer:
​
BIAS[:
​
LOW]
​
on page 868
[SENSe:
​
]MIXer:
​
BIAS:
​
HIGH
​
on page 868
Data Input and Output