Measurement
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When sweeping the frequency of a signal applied to the DUT (F), there is a
frequency difference between the input side and output side of the DUT
due to the delay time that occurs in the DUT (Delta T). This frequency
difference (Delta F) becomes larger as the electrical delay time of the DUT
becomes longer and the frequency sweep speed becomes faster, as shown
in the following equation.
When measuring a DUT with long electrical delay time, if you perform
measurement (sampling) while sweeping the measurement signal as in the
swept mode, a measurement error occurs due to the difference between
the frequency outputted from the source port and the frequency actually
measured at the receiver port.
Therefore, when measuring a DUT with a long electrical delay time,
generally use the stepped mode to prevent the measurement error
described above. However, if you need to shorten the sweep time,
evaluate the measurement error as described below to determine the
sweep mode that should be used.
Turning off the updating of information displayed on the LCD screen
Turning off the updating of information displayed on the LCD screen
eliminates the processing time required to update displays within the
analyzer, improving measurement throughput. If it is not necessary to
check displayed information during measurements, turning off real-time
updating is an effective means of improving throughput.
The updating of information displayed on the LCD screen can be switched
using the following procedure:
Turning off the updating of information
1. Press Display key.
2. Click Update to switch the updating of displayed information on the
LCD screen on/off.
When the LCD screen update is turned off, Update Off appears on
Instrument Status Bar.
Turning off system error correction
The E5071C executes Port Characteristics Correction in the data processing
flow shown in Data Processing Flowchart, by using the system calibration
data set at the factory. This system error correction process is not required
if the user performs proper calibration by using the Cal key and the
softkeys that subsequently appear, which automatically turns on error
correction.
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