Keysight Technologies N9040B UXA Manual page 60

Measurement Related Tasks and Concepts
Setting the Measurement System
Table 3-1 User Cal vs. Internal Cal
Items
System connection and
setting procedure
Calibration Theory
When to perform
calibration?
Advantage
Recommended use
cases
60
User Cal
User Cal needs a different system
connection. To perform User Cal, you
need to connect the noise source
directly to the signal analyzer first,
without the DUT, as shown in
Figure 2-1
on page 15. And then on
the instrument,
1. Press MEAS SETUP, Cal
Setup, User Cal.
2. Press CALIBRATE.
In User Cal, the instrument measures
the P and P values directly and
cold hot
stores them in the instrument.
For cases described in "When to
Perform Calibration" on page
you need to change the system
connection to the calibration setup and
perform the User Cal again.
Accurate calibration results
Choose User Cal when
— you are very concerned about
getting accurate data.
— the DUT is not connected to
the noise source and signal
analyzer directly, but via some
test fixtures or automated test
equipment.
Internal Cal
Internal Cal does NOT need the special system
connection. Just connect the noise source, DUT,
and signal analyzer as desired, and perform the
Internal Cal.
On the instrument, press MEAS SETUP, Cal
Setup, Internal Cal.
Internal Cal uses the internal cal files stored in the
instrument and USB preamp. The information
contained there allows the instrument to calculate
the P and P values.
cold hot
Internal Cal takes most of the cases of
59, Perform Calibration" on page 59
account inside the instrument. So you don't need
to make an Internal Cal again and again for most
cases.
However, if the ambient temperature is
significantly changed, it is recommended to
perform the Characterize Noise Floor operation on
the signal analyzer by pressing System,
Alignments, Ad vanced, Characterize
Noise Floor.
Simple system connection without a mechanical
connection change for calibration.
Choose Internal Cal when
— you are very concerned about
measurement speed.
N9069C Noise Figure Measurement Guide
"When to
into