11
.
The items on this menu are:
VNA MODE
This option will allow you to select the operating mode for the VNA function of the instrument. There
are two possible selections (use the
button):
S11
- This enables single-port impedance analysis, including impedance magnitude and
impedance phase. Used to analyze single-port devices such as antennas and terminated
feed lines.
S21
- This enables two-port analysis, primarily for gain measurements on two-port networks
such as filters and attenuators.
CALIBRATIONS
This option selects the type of calibration method to use for measurements. There are two possible
selections (use the
button):
BROADBAND
- When BROADBAND is selected, instrument calibration is performed over the
BRAVO EX2
’s entire frequency range of 100KHz to 525MHz (See Section 4 for procedures).
After that, any frequency range can be selected without having to re-calibrate. This form of
calibration will provide good accuracy with the convenience of not having to recalibrate for
each frequency or bandwidth change. For the most accurate measurements select
“Frequency Specific” (below).
FREQUENCY SPECIFIC
- This calibration mode will require recalibration with any change in
frequency or bandwidth (Span). In this mode, the BRAVO EX2 will automatically go to the
calibration screen prompts when any frequency changes are entered. The measurements,
however, will be more accurate than using Broadband Calibration.
BROADBAND CAL
This option will initiate the broad-banded calibration cycle. This calibration is stored in the unit, and is
valid anywhere in the units operating range. The Broadband calibration may be performed with or
without a test lead and/or adapters attached. It will display a series of calibration screens prompting
the user to attach the Open, Short, and Load Terminators in turn. Press ENTER for each one to
complete the process. The Open prompt can use the open end of the test lead, adapter or
instrument’s N connector. Attaching an Open Terminator is optional, although recommended as it
gives better accuracy overall. Once this process is complete, the calibration data is stored, and the
instrument will be placed in BROADBAND calibration mode. See Section 4 for more information on
calibration steps. For best results allow unit to warm-up 5-10 minutes and use the precision 3 way
Open, Load and Short.
