40m
QIL
Cryo_Lab
CTN
SUS_Lab
TCS_Lab
OMC_Lab
CRIME_Lab
FEA
ENG_Labs
OptContFac
Mariner
WBEEShop
|
PSL |
Not logged in |
 |
|
Fri Nov 1 17:54:47 2019, anchal, DailyProgress, FSS, FSS Diagnostics - RFPD RF Ouput under inspection   
|
Tue Nov 5 18:37:59 2019, anchal, DailyProgress, FSS, FSS Diagnostics - TTFSS Testpoint Spectrum Data
|
Sat Nov 9 19:28:36 2019, anchal, DailyProgress, FSS, FSS Diagnostics - Loop nonlinearity Test  
|
Mon Nov 11 20:42:49 2019, anchal, DailyProgress, FSS, FSS Diagnostics - Two Tone Test  
|
Tue Nov 12 18:36:59 2019, anchal, DailyProgress, FSS, FSS Diagnostics - Two Tone Third Order Intermodulation Test
|
Thu Nov 14 12:19:32 2019, rana, DailyProgress, FSS, FSS Diagnostics - Two Tone Third Order Intermodulation Test
|
Tue Nov 19 18:51:02 2019, anchal, DailyProgress, FSS, FSS Diagnostics - Second-order Distortion Calculation 
|
Mon Dec 9 19:54:44 2019, anchal, DailyProgress, FSS, FSS Diagnostics - How much distortion affects the functioning of PDH?
|
Wed Nov 27 13:59:24 2019, anchal, DailyProgress, FSS, FSS Diagnostics - TTFSS TP1 TimeSeries
|
Wed Nov 27 15:17:51 2019, anchal, DailyProgress, FSS, FSS Diagnostics - Quick HF OLTF of NFSS
|
Wed Nov 27 16:31:20 2019, rana, DailyProgress, FSS, FSS Diagnostics - Quick HF OLTF of NFSS
|
Wed Dec 4 18:11:09 2019, anchal, DailyProgress, FSS, Free running laser frequency noise spectrum
|
Thu Dec 5 18:25:11 2019, rana, DailyProgress, FSS, Free running laser frequency noise spectrum
|
Tue Dec 17 18:29:58 2019, anchal, DailyProgress, FSS, Need for ISS?
|
Wed Dec 18 18:40:32 2019, anchal, DailyProgress, FSS, Maybe the NPRO Laser isn't bad after all
|
Wed Dec 18 22:03:17 2019, rana, DailyProgress, FSS, Maybe the NPRO Laser isn't bad after all
|
Fri Dec 20 15:00:30 2019, anchal, DailyProgress, FSS, PZT, EOM to RIN TF Measurement
|
Fri Dec 20 18:08:44 2019, anchal, DailyProgress, FSS, PZT, EOM to RIN TF Measurement Through FSS
|
Tue Jan 7 17:59:20 2020, anchal, DailyProgress, FSS, NPMC TF
|
Thu Dec 12 19:15:55 2019, anchal, DailyProgress, FSS, FSS Diagnostics - Beatnote Spectrum wrt Laser Power and Modulation Index
|
Tue Dec 17 16:55:07 2019, anchal, DailyProgress, FSS, FSS Diagnostics - TTFSS North U7 Boost Stage Input-Output TimeSeries
|
Tue Nov 12 11:39:48 2019, anchal, DailyProgress, FSS, FSS Diagnostics - RFPD RF Ouput under inspection
|
Fri Dec 13 16:24:02 2019, anchal, DailyProgress, FSS, FSS Diagnostics - RFPD Circuit Latest Available Photos   
|
Fri Dec 13 17:44:05 2019, anchal, DailyProgress, FSS, FSS Diagnostics - RFPD RF Coupled Output Offset
|
Mon Jan 13 19:04:38 2020, anchal, DailyProgress, FSS, FSS Diagnostics - SN009 (North RFPD) Notch Improvement Attempt  
|
Tue Jan 14 18:19:33 2020, anchal, DailyProgress, FSS, FSS Diagnostics - SN009 (North RFPD) Notch Improved!  
|
Thu Jan 16 11:17:15 2020, anchal, DailyProgress, FSS, FSS Diagnostics - SN010 (South RFPD) Notch Improvement Attempt  
|
Thu Jan 16 20:18:44 2020, anchal, DailyProgress, FSS, FSS Diagnostics - SN010 (South RFPD) Notch Improved  
|
Mon Jan 27 18:29:19 2020, anchal, DailyProgress, FSS, FSS Diagnostics - RFPD RF Out Spectrum
|
|
Message ID: 2477
Entry time: Mon Nov 11 20:42:49 2019
In reply to: 2476
Reply to this: 2479
|
Author: |
anchal |
Type: |
DailyProgress |
Category: |
FSS |
Subject: |
FSS Diagnostics - Two Tone Test |
|
|
Method
- RFPD of the FSS loops were tested through there Test input ports (Updated schematics: South SN010, North SN009)
- I first took transfer function from the Test input port to the RF out port. Ideally, the transfer function of RFPD should be 100kOhm times this transfer function.
- Moku is used to generate two RF signals with a different frequency equivalent to RFPD's resonant frequency.
- These two outputs are combined with ZFSC-2-1W-S+ two-way splitter/combiner.
- I switched around the voltage amplitude of these frequencies and took a spectrum from AG4395A near difference frequency.
- The configuration file for spectrum measurement is present with data.
- This measurement was made through twoToneTest script present in the data folder.
Inferences:
- In first plot of each measurement set, I simply plotted the measured spectrum at the different signal voltage levels.
- In second plots, I have done some back calculations, but I'm not sure if this is a good of estimating non-linearity.
- I have used following formula to calculate ratio of total power in the difference frequency to the GM of powers of probe signals.

- This ratio I have plot in dB in the second plot.
- It seems that the spectrum level generated is not dependent on how strong the probe signals are.
- This can be seen as along the diagonal, instead of remaining the same ratio, the ratio decreases by 20 dB in each step which is an increase in the denominator above.
- Lastly, I just connected the two ends of cable between which DUT goes and repeated the measurement.
- The non-linearity of the measurement setup itself is safely 50 dB below the measured values.
But what now?
- I need more time to make sense of these measurements. So that will come tomorrow.
Data |
|
|
|
|
|
|