Time Domain - Option 010
61
Gating
Perhaps the most beneficial feature of Time Domain transform is the Gating
function. When viewing the Time Domain response of a device, the gating
function can be used to "virtually" remove undesired responses. You can then
simultaneously view a frequency domain trace as if the undesired response did
not exist. This allows you to characterize devices without the effects of external
devices such as connectors or adapters.
Gating is best performed while viewing a Time Domain trace. Then, either disable
Transform, or separately view a frequency domain trace to see the trace with the
gated effects removed.
NOTE
When a discontinuity in a test device reflects energy, that energy will not reach
subsequent discontinuities. This can "
MASK
", or hide, the true response which
would have occurred if the previous discontinuity were not present. The Gating
feature does NOT compensate for this.
The following image shows how gating can affect measurement results.
All 4 traces show the same S11 measurement.
Trace 1 shows the
frequency
response
without
gating enabled.
Trace 2 shows the
transform
response
without
gating enabled.
Trace 3 shows the
transform
response
with
gating enabled.
Trace 4 shows the
frequency
response
with
gating enabled.
How to make Time Domain Gating settings
Press
Measure 4
Then
Transform
Then
Gating
Then choose from:
o
On
Gating is being performed.
o
Off
Gating is NOT being performed.