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Chapter 10 — Bias Tee, Option 10
10-1 Introduction
Option 10 provides an internal bias tee for the VNA Master or for the S412E LMR Master. In
Vector Network Analyzer mode, the internal bias tee permits testing of amplifiers that
require their system power to be supplied from their RF signal port.
In addition to the internal bias tee, the MS20xxC VNA Master features two input ports
(BNC(f)) that offer you the ability to supply external bias current to the unit under test.
In the MS20xxB VNA Master and the S412E LMR Master only, the internal bias tee can be
used in both the Vector Network Analyzer and the Spectrum Analyzer. The bias voltage is
available to both the VNA Port and the SPA RF In port.
To access the Bias Tee menu in the MS20xxC, MS2026B, or MS2028B VNA Master, the
MS20xxB VNA Master, or the S412E LMR Master while in the VNA Measurements view
(not the Field Measurements view), press the Sweep function hard key to open the Sweep
menu (refer to
"Bias Tee Menus (MS20xxC, MS2026B, and MS2028B)" on page
10-7), then
the Configure Ports soft key, then the Bias Tee Setup soft key. The Bias Tee menu
("Bias Tee
Menu" on page
10-9) is opened with the Bias Tee soft key in the Bias Tee Setup menu
("Bias
Tee Setup Menu" on page
10-8).
To access the Bias Tee menu in the MS20xxB VNA Master and the S412E LMR Master in the
Field Measurements view, press the Shift key and then the System (8) key to open the
System menu (refer to
"Bias Tee Menus (Field Measurements View)" on page
10-10). Then
press the Application Options soft key, and then the Bias Tee Setup soft key. The Bias Tee
menu
("Bias Tee Menu" on page
10-11) is opened with the Bias Tee soft key in the Bias Tee
Setup menu
("Bias Tee Setup Menu" on page
10-11).
10-2 Bias Tee Fundamentals
For the internal function, the bias arm is connected to an internal power source that can be
turned on as needed to place the voltage on the center conductor of VNA Port 2 for the
MS20xxB or the S412E or on either of the VNA ports for the MS20xxC. Because the MS20xxC
features full S-parameter testing at both Port 1 and Port 2, the bias voltage for these models
is also available from either port upon selection by the user. This voltage can be used to
provide power to block down-converters in satellite receivers and can be used to power some
tower-mounted amplifiers.
Vector Network Analyzer MG
PN: 10580-00289 Rev. K
10-1
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