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DATA ENTRY FOR COUPLED FUNCTIONS
Coupled
Function
3 dB resolution bandwidth (IF filter) which largely determines the ability of the analyzer to
resolve signals close together in frequency.
3 dB bandwidth of the post detection low pass filter that averages noise appearing on the
trace.
The total time for the analyzer to sweep through the displayed frequency span or display a
detected signal in zero frequency span.
The setting of the input RF attenuator which controls signal level at the input mixer.
Selects center frequency change for each DATA @ @ when I=] is activated.
DATA ENTRY FOR COUPLED FUNCTIONS
Discrete values are entered for [:;'I , [':";"J , ['I:::'1 , and (.,,,. . The DATA entry from DATA a a n d @j ;,&J
selects these values sequentially from the current value. A DATA entry from the keyboard which is not exactly
equal to an allowable value will select an adjacent value. For example, [::'1
bandwidth, the next higher IF bandwidth.
RESOLUTION BANDWIDTH
widths that can be selected are 10 Hz, 30 Hz, 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz, 100 kHz, 300 kHz,
1 MHz, and 3 MHz.
Example
A measurement requiring manual resolution bandwidth selection is the zero span (time domain) observation of
modulation waveforms. An example can be found in Chapter 3, ZERO FREQUENCY SPAN - FIXED TUNED
RECEIVER OPERATION.
70 Manual Operation
Selects
C O U P L E D F U N C T I O N
will select 30 kHz
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