To Use Direct Sampler Access Configurations (Option 014 Only) - Agilent Technologies 8753ET User Manual

Optimizing Measurement Results
Reducing Noise
To Use Direct Sampler Access Configurations (Option 014 Only)
Direct sampler access to both the A and B samplers can decrease the noise floor of the
analyzer. Analyzers with Option 014 have the ability to externally reverse the test port
couplers by repositioning the A or B sampler and the PORT 1 or PORT 2 SWITCH and
COUPLER jumpers. This configuration enables the analyzer to increase the dynamic
range in the forward direction by approximately 16 dB. When making reverse
measurements in the forward dynamic range configuration, PORT 2 output power is
reduced approximately 16 dB. Similarly, the dynamic range in the reverse direction can be
increased by approximately 16 dB by repositioning the A sampler ports and the PORT 1
SWITCH and COUPLER port jumpers. Refer to Figure 5-1 to see the front-panel
configuration for the increased forward dynamic range mode.
Figure 5-1 Increased Forward Dynamic Range Configuration
Increased Power Dynamic Range
• Maximum power you should input to the test port in this configuration is −5 dBm
without compression.
• For best results when measuring high and low loss devices, like filters, the sweep type
"LIST FREQ SWEPT" mode should be used. Using this sweep type allows you to
maximize power to the device under test. By editing the frequency list, the power level
in the pass band region can be reduced, while the lower level in the rejection band
region can be increased. When calibrating the instrument, make sure the
is off. This can be accomplished by changing the list type to stepped,
LIST POWER
which automatically turns off the list power. The source power should be set to a level
that will not cause compression during the "thru" standard and to the maximum list
power during an isolation calibration step. After the calibration is completed and the
device under test has been connected to the instrument, turn the
select
LIST FREQ SWEPT
mode, refer to "Swept List Frequency Sweep (Hz)" on page
5-16
. For more information regarding the
LIST POWER
LIST FREQ SWEPT
7-18.
on or