6 Input/Output
6.7 Output
Source SCPI Notes
practical when the IF Bandwidth is <= 40 MHz, IF Path is <= 40 MHz, or FFT Width is <=
40 MHz
Fast Log
Video
LOGVideo
The 2
nd
IF output is passed through a log amp and the log envelope of the IF signal is
sent to the rear panel. The open circuit output level varies by about 25mV per dB, with
a top-of-screen signal producing about 1.6 Volts. The output impedance is nominally
50 ohms
This mode is intended to meet the same requirement as Option E4440A-H7L Fast Rise
Time Video Output on E4440A PSA Series, allowing you to characterize pulses with fast
rise times using standard measurement suites on modern digital scopes
Notes on the Aux IF Outputs
Second IF
Does not appear unless Option CR3 is installed.
The frequency of the 2
nd
IF depends on the current IF signal path as shown in the
table below:
IF Path Selected Frequency of “Second IF” Output
10 MHz 322.5 MHz
25 MHz 322.5 MHz
40 MHz 250 MHz
85-160 MHz 300 MHz
255 MHz 750 MHz
510 MHz 877.1484375 MHz
The signal quality, such as signal to noise ratio and phase noise, are excellent in this
mode.
Arbitrary IF
Does not appear unless Option CRP is installed.
The bandwidth of this IF output varies with band and center frequency, but is about
40 MHz at the -3 dB width. When the output is centered at lower frequencies in its
range, signal frequencies at the bottom of the bandwidth will “fold”. For example,
with a 40 MHz bandwidth (20 MHz half-bandwidth), and a 15 MHz IF center, a
signal -20 MHz relative to the spectrum analyzer center frequency will have a
relative response of about -3 dB with a frequency 20 MHz below the 15 MHz IF
center. This -5 MHz frequency will fold to become a +5 MHz signal at the IF output.
Therefore, lower IF output frequencies are only useful with known band-limited
signals.
Fast Log Video
Does not appear unless Option ALV is installed.
Short Range Comms & IoT Mode User's &Programmer's Reference 2164
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