Rohde & Schwarz CMU-K20, Руководство по эксплуатации

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Non Signalling: Connection Control CMU-K20/K21/K22/K23/K24
1115.6088.12 4.74 E-11
The following settings are not provided in the table-oriented version of the
Analyzer tab:
Default Settings
The Default All Settings switch assigns default values to all settings in the Analyzer
tab (the default values are quoted in the command description in chapter 6 of this
manual).
Remote control
RFANalyzer:DEFault
Analyzer Level –
RF Mode
The Analyzer Level table section sets the maximum input level that can be
measured. The maximum input level is displayed next to the softkey Max. Level in
the main menu Analyzer/Generator (see page 4.2 ) and in the parameter lines
above the graphical measurement menus. Two alternative RF Modes for defining
this value are provided:
Manual Manual input of maximum input level in the RF Max. Level field
Auto Automatic setting of maximum input level (autoranging)
according to the peak power (PEP) of applied signal
Remote control
[SENSe:]LEVel:MODE <Mode>
Analyzer Level –
RF Max. Level The maximum expected input level can be entered in the RF Max. Level input field.
Input levels exceeding the RF Max. Level overdrive the input path and cause
invalid results (“– – –“).
External input
attenuation
The range of RF Max. Level values depends on the RF input used. If an external
input attenuation is reported to the instrument to compensate for a known path loss
(see section
AF/RF Connectors (Connection Control – AF/RF) on page 4.80 ), all
levels measured are referenced to the output of the DUT and therefore shifted with
respect to the actual level at the input connectors of the CMU. The level ranges for
the input connectors are shifted as well.
Error messages If the value determined for RF Max. Level is too high or too low, a window with the
error message "<Max_Level> is out of range. <permissible max. value> is limit ."
and three fields will appear:
Accept The permissible max. value is accepted as RF Max. Level ,
Re-edit RF Max. Level is entered once again,
Cancel The last valid input value is maintained.
When switching over to another input, the current value of RF Max. Level is
automatically adapted, if required:
•
Towards lower values to the maximum value of the new input,
•
Towards upper values to the minimum value of the new input.
Note: A maximum input level can be entered even if automatic level setting
(autoranging) is selected. The entered level is used as a start value for
the autoranging routine and is also important to ensure safe
switchover to manual setting.
Remote control
[SENSe:]LEVel:MAXimum <Level>
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