Initial Source Port Control Function - Agilent Technologies E5071C Manual

E5071C

Initial Source Port Control function

It protects the output amplifier inside the instrument against any potential
damage due to transient voltage that may be externally applied. After the
firmware is installed, this feature is activated at power-on. When activated,
this feature attenuates the output signal and turns off the test port LED
each time a sweep finishes. At the same time, it switches the stimulus
signal output test port in the trigger hold state to a pre-selected test. A
test port 1 is selected at power-on.
The Init Src Ctrl feature lets you select the stimulus signal output test port
in the trigger hold state. By setting the stimulus signal output test port to a
test port which hardly experience transient voltage, this feature can reduce
the possibility that the output amplifiers of the instrument may be
damaged by transient voltage. Transient voltage occurs when the active
DUT is connected or an external DC power supply is turned on. A test port
not used or a test port to which the DUT input terminal is connected can be
regarded as a test port which hardly experience transient voltage. The
following table shows the degree of tolerance to transient voltage of each
test with this feature. Connect the DUT so that transient voltage is not
applied to test ports with low tolerance.
Test Port Low tolerance test ports
to select Connected to the
instrument's output
(Stimulus
amplifier.(Recommended
signal
connection: test port not
output test
used or DUT input terminal)
port)
When test Test port 1, test port 3
port 1 is
selected
When test Test port 2, test port 3
port 2 is
selected
When test Test port 3, test port 1
port 3 is
selected
When test Test port 4, test port 1
port 4 is
selected
734
High tolerance test ports connected
to 50 ohm termination inside the
instrument.(Recommended
connection: DUT output terminal)
Test port 2, test port 4
Test port 1, test port 4
Test port 2, test port 4
Test port 2, test port 3