Agilent Technologies HP 8566B Dokumentacja Strona 222

  • Pobierz
  • Dodaj do moich podręczników
  • Drukuj
  • Strona
    / 405
  • Spis treści
  • BOOKMARKI
  • Oceniono. / 5. Na podstawie oceny klientów
Przeglądanie stron 221
8.
21.4
MHz
Bandwidth
Filter
Adjustments
Reference
Related Performance
Tests
Description
IF-Display Section
A4A4
Bandwidth Filter
A4A8
Attenuator-Bandwidth Filter
IF Gain Uncertainty Test
Resolution Bandwidth Switching Uncertainty test
Resolution Bandwidth Selectivity Test
First the LC Filters (100
kHz
to 3 MHz bandwidths) on the
A4A4
Bandwidth Filter are adjusted. The crystal filter poles (3
kHz
to 30
kHz
bandwidths) are then adjusted for center and symmetry by
bypassing all but one pole at a time and adjusting the active pole.
Next, the LC filters and the crystal filter poles on the
A4A8
Attenuator-Bandwidth Filter are adjusted in the same manner as on
the
A4A4
Bandwidth Filter.
Last, the 10
dB
and 20
dB
attenuators on the
A4A8
Attenuator-
Bandwidth Filter are adjusted for the proper amount of attenuation.
This is done by connecting the CAL OUTPUT signal to the RF INPUT
through two step attenuators, keying in the necessary reference level
to activate the 10
dB
and the 20
dB
control lines, adjusting the step
attenuators to compensate for the attenuation, and adjusting the
attenuators for the proper amount of attenuation.
1OdB
STEP
1dB
STEP
ATTENUATOR
ATTENUATOR
Figure 3-40. 21.4 MHz Bandwidth Filter Adjustments Setup
3-92 Adjustments
Przeglądanie stron 221
1 2 ... 217 218 219 220 221 222 223 224 225 226 227 ... 404 405

Komentarze do niniejszej Instrukcji

Brak uwag