Agilent Technologies HP 8642A/B Specifiche Pagina 142

  • Scaricare
  • Aggiungi ai miei manuali
  • Stampa
  • Pagina
    / 453
  • Indice
  • SEGNALIBRI
  • Valutato. / 5. Basato su recensioni clienti
Vedere la pagina 141
Description of the Single Sided Spur Calibration
Method
A second RF signal generator and a directional coupler are required to
inject the calibration spur. The calibration spur should be adjusted to
approximately —40 dBc at an offset frequency that can be accurately
measured with the RF analyzer. A spur level of —20 to —130 dBc is
acceptable, however, levels within the range —26 to —60 dBc are optimum.
The calibration spur can be set at a frequency offset of 1 Hz to 100 kHz
(40 MHz with a supported RF analyzer) however 20 Hz to 50 kHz is
recommended.
NOTE
It is important to insure that the level of the calibration
spur is greater than any other spurious signals present in
the frequency spectrum. When the system measures the
calibration spur, the analyzer does a peak search over a
frequency span of two times the entered spur frequency.
Ensure that there is at least 20 dB of isolation between the drive circuit to
the R input port and the L input port of the Phase Detector by measuring
the level of the spur at both input ports. (Less than 20 dB of isolation will
cause the calibration spur to be correlated out by the phase detector.)
When the Connect Diagram appears, the Calibr Process softkey will
provide access to the the Determination of Phase Detector Constant
display (Calibr Process) where the calibration spur values can be entered.
Calibr Process: $N w/o PLL 2-73
Vedere la pagina 141
1 2 ... 137 138 139 140 141 142 143 144 145 146 147 ... 452 453

Commenti su questo manuale

Nessun commento