4-27 Measure Chapter 4 — Spectrum Analyzer
4-50 MS20xxA VNA Master UG 10580-00166 Rev. C
instrument sweeps one time for every demodulation period. Sweeping pauses
during the demodulation time.
Set Demod Freq to Current Marker Freq
Sets the demodulation frequency to the frequency of the current marker.
Beat Freq Osc
Sets the beat frequency of the oscillator to exactly set the demodulation
frequency of USB and LSB signals.
Volume
The current volume setting is displayed on the screen. Use the Up/Down arrow
keys or rotary knob to change the volume, and press the
Enter key to select.
Back
Returns to the previous menu.
C/I
The Carrier to Interference ratio is a two-step measurement sequence that first
measures the amplitude of a carrier, then, with the carrier turned off, measures the
amplitude of all other interfering signals within the channel bandwidth.
On Off
Starts and stops the carrier to interference measurement.
Center Freq
Use the keypad, the directional arrow keys or the rotary knob to enter the center
frequency.
Span
Use the keypad, the directional arrow keys or the rotary knob to enter the
frequency span.
Carrier Signal Type
Opens a menu to select the carrier signal type.
NB FHSS (Narrow Band Frequency Hopping Spread Spectrum)
Use this setting when the signal being measured is 802.11b.
WB FHSS (Wide Band Frequency Hopping Spread Spectrum)
Use this setting when the signal being measured is 802.11a or 802.11g.
Broadband
Use this setting when the signal being measured is a digital modulation
format such as CDMA, GSM, and so forth.
Back
Returns to the previous menu.
Min Sweep Time
Set the minimum sweep time for the measurement.
Back
Returns to the previous menu.
Measurement Off
Pressing this soft key turns off any active measurement, including demodulation.
10580-00166C.book Page 50 Thursday, February 21, 2008 12:52 PM
To Next Page