The gating function of the Agilent analyzers has a "set up" limitation,
i.e., a minimum setting of the RBW for a given width signal. This
limitation is due to the time required for the resolution-bandwidth filters
to fully charge before the gate comes on. The relationship is set up time
(SUT) > 2/RBW.
For a 1.5 ms burst,
SUT > 2/RBW, or RBW > 2/SUT
in this case, RBW > 2/1.5 ms; that is RBW >1300 Hz.
To be able to see a signal 1 kHz away, I need to use a RBW < 300 Hz. Due to
the design of the RBW filters, this is not possible with an Agilent
analyzer. Does anyone know if any other brand of analyzer implement the RBW
filters differently so this is not an issue?
Best regards,
Don Umbdenstock
Sensormatic
From: [email protected] [mailto:[email protected]]
Sent: Thursday, March 18, 2004 6:21 PM
To: [email protected]
Subject: Gated measurements
Does anyone know of equipment that can perform a gated measurement of a
burst of 50 kHz, 1.5 ms duration with a 50 Hz rep rate.
The equipment that I currently have can perform gating with RBW greater than
1 kHz. I need to use an RBW of 200-300 Hz to determine characteristics of
interest 1 kHz away from my 50 kHz signal. The setup time is not compatible
with the RBW.
Have I bumped into the laws of physics or the design limitation of the piece
of equipment? I am currently working with an Agilent E7401A with gating
option 1D6.
Any experiences related to gated measurements would be appreciated.
Best regards,
Don Umbdenstock
Sensormatic
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