Agilent Technologies HP 8642A/B Specifiche Pagina 163

  • Scaricare
  • Aggiungi ai miei manuali
  • Stampa
  • Pagina
    / 453
  • Indice
  • SEGNALIBRI
  • Valutato. / 5. Basato su recensioni clienti
Vedere la pagina 162
Description of the Double Sided Spur AM Detector
Calibration Method
An RF spectrum analyzer or modulation analyzer is required to measure
the fundamental signal and the spur. A spur level of —30 to —60 dBc is
recommended. (If you are using a supported source that is under system
control to generate the calibration spur, you will be required to enter the
relative amplitude of the spur. An entry of —40 dBc is recommended;
2%
AM produces a —40 dBc sideband.) The calibration spur can be set
at a frequency offset of 1 Hz to 100 kHz (20 MHz with a supported RF
analyzer).
NOTE
The HP 3048A expects the DUT to be set to the same
power level as the calibration source prior to beginning the
measurement.
It is important to insure that the level of the calibration spurs is greater
than the level of any other spurious signals present in the frequency
spectrum. Also, you should evaluate both sideband calibration spurs to
ensure that they are equal in amplitude. (Any deviation in the amplitude
of the calibration spurs indicates the presence of phase modulation in the
measurement circuit. The HP 3048A's specified measurement accuracy is
maintained as long as the difference in the sideband levels is less than
2 dB, and the average value of the levels is used.)
When the Connect Diagram appears, the Calibr Process softkey will
provide access to the the Determination of Phase Detector Constant
display where the calibration spur values can be entered.
Calibr Process: AM Noise 2-95
Vedere la pagina 162
1 2 ... 158 159 160 161 162 163 164 165 166 167 168 ... 452 453

Commenti su questo manuale

Nessun commento