356 Keysight N9927-90001 User’s Guide
ERTA (Extended Range Transmission Analysis) Mode - Option 209
Configure Measurement Settings
Improve Dynamic Range
The following settings can be made to reduce measurement noise which
improves Dynamic Range.
Increase source power as much as possible while maintaining a leveled source.
How to set Source Power
—Press Meas Setup 4
—Then Remote Source
—Then Source Power
— Then either Max Power or Leveled - Increase source power until the
unleveled warning appears. Then decrease power until power is again
leveled.
To further reduce measurement noise, on the Receiver unit:
— Reduce Attenuation to 5 dB, then turn the Preamp ON. Learn how in
“Preamplifier Control (Opt 235)” on page 153.
— Decrease the Res BW. Learn how in “Resolution Bandwidth (Res BW)” on
page 163.
—Set Frequency Reference to GPS on both units. This requires Option 307
(Built-in GPS) and two GPS antennae. The GPS reference can be enabled
for several sweeps. Then if you move to a location without an adequate GPS
signal, Hold-over Mode will occur. Learn more about GPS as a frequency
reference in “Frequency Reference Source” on page 492.
Source Enable and Source Mode
When Source Enable [OFF] is selected, or when Source Mode [CW or
CoupledCW] is selected, then synchronization ends and the two partner units
revert to general SA (non-tracking) sweeps. However, the units are still in
partnership, and other settings continue to be synchronized such as
Frequencies, ResBw, and Points.
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