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Entry  Wed Jan 29 12:29:33 2020, shruti, Update, General, delay line frequency discriminator for PM 20200128.pngIMG_BB01C068495A-1.jpeg
    Reply  Thu Jan 30 15:24:10 2020, ?, Update, General, delay line frequency discriminator for PM 
       Reply  Thu Jan 30 22:02:42 2020, shruti, Update, General, delay line frequency discriminator for PM Figure_2.png
Message ID: 15180     Entry time: Thu Jan 30 22:02:42 2020     In reply to: 15177
Author: shruti 
Type: Update 
Category: General 
Subject: delay line frequency discriminator for PM 

I could not find any level 3 mixers, but by adjusting the beat frequency the power in each of the delay line channels rose to almost 6.5 dBm.

In short: Delay line seems to work

Things I did earlier today:

  1. Played with the slow servo on the FSS screen, but then reset the parameters to what was there before (Later found out that this was to lock the PSL freq to the IMC when the IMC power is significant.)
  2. Connected the AG 4395A to the X PZT
  3. Closed the PSL shutter

Transfer function measurement: (Refer Attachment 1)

Everything about the setup remained as I had left it earlier: described in elog 15174


  • SR560 gain set to 10, DC coupled
  • DC block at channel A of Agilent (The measurement was A/R)

I did not use a slow servo, but took individual sweeps adjusting the PSL temperature each time to bring the error voltage between +/-25 mV. The beat frequency was over 100 MHz.

For the plot posted in Attachment 1, the measurement paramters are the following. Will do further measurements/analysis tomorrow.

# AG4395A Measurement - Timestamp: Jan 30 2020 - 21:58:00
# Parameter File: TFAG4395Atemplate.yml
#---------- Measurement Parameters ------------
# Start Frequency (Hz): 50000.0, 50000.0
# Stop Frequency (Hz): 1000000.0, 1000000.0
# Frequency Points: 801, 801
# Measurement Format: LOGM, PHAS
# Measuremed Input: AR, AR
#---------- Analyzer Settings ----------
# Number of Averages: 1
# Auto Bandwidth: Off, Off
# IF Bandwidth: 1000.0, 1000.0
# Input Attenuators (R,A,B): 0dB 0dB 0dB 
# Excitation amplitude = -20.0dBm


yes, its fine to use this with a level 3 or level 7 mixer; let's see some PM transfer functions !


Is this sufficient enough for the mixer to work?

Attachment 1: Figure_2.png  109 kB  | Hide | Hide all
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