R&S FSMR, Руководство по эксплуатации, Страница: 339 / 955

R&S FSMR Limit Lines
1166.3363.12 4.17-9 E-2
Margin - Setting a margin.
The margin is defined as the signal-level distance to the limit line. When the
limit line is defined as an upper limit, the margin means that the level is below
the limit line. When the limit line is defined as a lower limit, the margin means
that the level is above the limit line. The default setting is 0 dB (i.e. no
margin).
IEC/IEEE-bus command:
CALC:LIM3:UPP:MARG 10dB
CALC:LIM3:LOW:MARG 10dB
Threshold – Selection of the threshold value with relative Y scaling
With relative Y scaling, an absolute threshold value can be defined which
lowers the relative limit values. The function is useful especially for mobile
radio applications provided the limit values are defined in relation to the
carrier power as long as they are above an absolute limit value.
Example:
RBW 300 Hz
VBW 3 kHz
SWT 100 ms
Marker [T1]
-28.4 dBm
200.0100 MHz
10 kHz/
Ref -20 dBm
Att 10 dB
Center 200 MHz
Span 100 kHz
relative limit line
absolute threshold
resulting limit
The preset value is at -200 dBm. The field is displayed if the value
RELATIVE is entered in the field Y-SCALING.
IEC/IEEE-bus command:
CALC:LIM3:UPP:THR -30 dBm
or
CALC:LIM3:LOW:THR -30 dBm
Comment
- Enter comments
Comments are arbitrary, however, they must be less than 41 characters long.
IEC/IEEE-bus command:
CALC:LIM3:COMM "Upper limit"
VALUES
The VALUES softkey activates the entry of the data points in the table
columns Time / Frequency and Limit/dB . Which table columns appear
depends upon the Domain selection in the table heading.
The desired frequency/time data points are entered in ascending order (two
repeated frequencies/time values are permitted).
IEC/IEEE-bus command:
CALC:LIM3:CONT:DATA 1MHz,3MHz,30MHz
CALC:LIM3:UPP:DATA -10,0,0
CALC:LIM3:LOW:DATA -30,-40,-40