Rohde & Schwarz CMU-K20, Руководство по эксплуатации

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Non Signalling: Modulation Measurements CMU-K20/K21/K22/K23/K24
1115.6088.12 4.52 E-11
[:CURRent]?
FETCh:ARRAy:MODulation:XPERror[:GMSK][:BURSt]:MMAX?
FETCh:ARRAy:MODulation:XPERror[:GMSK][:BURSt]
:AVERage?
etc.
Decode
The Decode hotkey defines whether or not guard or tail bits are decoded (for
GMSK modulation only).
Guard and tail bits are located at the beginning and the end of a normal burst (see
Fig. 4-33 ), which is why they also affect the phase error at the beginning and the
end of the useful information and therefore the frequency error. The CMU offers
two settings:
Standard Guard and tail bits are assumed to be in line with GSM. If the
mobile station does actually not send these bits correctly, large
phase errors will be measured at the beginning and end of the
useful information.
Guard & Tailbits Guard and tail bits are also decoded. This avoids excessive
phase errors in the case of bursts that do not comply with the
standard.
Remote control
CONFigure:MODulation:XPERror[:GMSK]:TIME:DECode
STANdard | GTBits
Tolerance Values (Modulation Configuration – Limits)
The Limits tab defines upper and lower error limits for the measured values of the Modulation
measurement.
Fig. 4-23 Modulation Configuration – Limits
Default Settings The Default Settings switches assign default values to all parameters of a particular
application. The default values are quoted in the command description in chapter 6
of this manual.
Remote control
CONFigure:MODulation:XPERror[:GMSK]:CONTrol:DEFault ON | OFF
etc.
深圳德标仪器
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