0:
Reference Clock Calibration
This tutorial takes you through the steps to calibrate the reference
clock which is a prerequisite to virtually all NACT operations.
M1:
Power Level Calibrations (Midnight SNA specific)
... updated for v4.20 ... Note the use of holding LEFT-ALT key
during procedure!
This tutorial takes you
through the process of setting the output level of the PWRCAL
circuit to 3 dBm and using that signal to determine the slope
and zero intercept values for the RF Power Meter. The calibrated
RF Power Meter is then used to set the RF OUT power level to a
standard value. Normally these procedures need only be done once
but it is advisable to repeat them periodically to assure that
the effects of environment changes and component aging have not
affected the Midnight SNA settings.
3:
Frequency Response Calibration
This tutorial takes you
through the process of generating and capturing calibration data to
account for variations in of the DDS output level at different
frequencies. The calibration data can be saved in EEPROM and
reloaded every time the NAT is powered up. This calibration
sequence also normalizes the power readings such that they reflect
the absolute power readings one would observe if the DDS were
outputting a constant RF power level of one milliwatt. Some basic
Signal Generator mode operations are also described.
3T:
Frequency Response Calibration
This tutorial takes you
through the process of generating and capturing calibration data to
account for variations in of the DDS output level at different
frequencies using only the touch screen. The keyboard is not
used. The calibration data can be saved in EEPROM and reloaded
every time the NAT is powered up. This calibration sequence also
normalizes the power readings such that they reflect the absolute
power readings one would observe if the DDS were outputting a
constant RF power level of one milliwatt. Some basic Signal
Generator mode operations are also described.
4:
Measuring DUT Frequency Response
This tutorial takes you
through the steps necessary to perform frequency scans on a basic
DUT (Device Under Test). A “basic DUT” is one that does not require
a test fixture and can be inserted directly into the test setup
between the DDS output and the RF Power Meter input. Basic DUTs
include RF filters, RF cables, attenuators, etc. The tutorial also
covers the plotting, spooling, and playback of the scan results.
M5:
Crystal Characterization and Matching
(Midnight SNA specific)
This tutorial takes you through the steps to test, grade, and
sort a batch of crystals to select one or more groups of
crystals for use in a crystal filter. The filter used as an
example here is a 6-crystal filter with a target -3dB band pass
of 400 Hz and a center frequency of about 3.277 Hz. As a rule
of thumb, the series resonant frequency spread should be less
than 10% of the target filter band pass. We will need six
crystals with a frequency spread of less than 40 Hz. A batch of
30 crystals are sorted to find the six with the narrowest series
resonant frequency spread.
6:
Return Loss Bridge
This tutorial takes you
through the steps to use a Return Loss Bridge (RLB) to measure the
return loss and VSWR of a resonating DUT.
7:
Making LC Measurements
This tutorial takes you
through the steps to configure and use your MSNA to measure
unknown capacitance and inductance values. It includes a
discussion of the theory behind the LC Meter (LCM) and a
description of one possible implementation of the required LC
Meter fixture (LCMF).
8:
Frequency Counter
This tutorial takes you
through the steps to configure and use your MSNA to measure
frequency. It includes a discussion of how frequency
measurements are made, how to tune SNA timing functions for
better accuracy, and a description of an RF signal conditioning
circuit.
9:
Measuring Harmonics using the PHSNA Measurement Receiver
This tutorial takes you
through the steps to configure and use your MSNA along with the
PHSNA Measurement Receiver to perform very wide frequency scans
and to find and analyze harmonic content. It includes a
discussion of the theory behind the Measurement Receiver and
some description of the PHSNA Measurement Receiver.
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