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Message ID: 3210     Entry time: Tue Jul 13 21:04:49 2010
Author: tara,rana 
Type: Summary 
Category: PSL 
Subject: Transfer function of FSS servo 

 I measured FSS's open loop transfer function.

For FSS servo schematic, see D040105-B.  

4395A's source out is connected to Test point 2 on the patch panel.

Test Point 2 is enabled by FSS medm screen.

"A" channel is connected to In1, on the patch panel.

"R" channel is connected to In2, on the patch panel.

the plot shows signal from A/R.

Note that the magnitude has not been corrected for the impedance match yet.

So the real UGF will be different from the plot.

 

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4395A setup

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network analyzer mode

frequency span 1k - 10MHz

Intermediate frequency bandwidth 100Hz

Attenuator: 0 for both channels

Source out power: -30 dBm

sweep log frequency

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medm screen setup

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TP2: enabled

Common gain -4.8 dB

Fast Gain 16 dB

Attachment 1: TF_FSS_ser.png  8 kB  Uploaded Tue Jul 13 22:05:53 2010  | Hide | Hide all
TF_FSS_ser.png
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