XIS Noise Problem
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Transcript of XIS Noise Problem
XIS Noise ProblemXIS Noise Problem
2004/3/162004/3/16
K.HayashidaK.Hayashida
Various kinds of NoiseVarious kinds of Noise
Stripe Noise Stripe Noise Band Noise type1Band Noise type1Band Noise type2Band Noise type2Jan9 event Jan9 event Kyoto FM-S1 NoiseKyoto FM-S1 NoisePSum 5 columns’ cycle noisePSum 5 columns’ cycle noise
Stripe NoiseStripe NoiseDummy CCD FM-S3
60Hz, 18KHz by Steve-sanObserved at MIT, too
Band Noise type1Band Noise type1
Dummy CCDDummy CCD200rows near Serial 200rows near Serial
registerregister5-50ADU drop in 5-50ADU drop in
pixel levelpixel levelFrequency 2~3/Frequency 2~3/ 22
00-13/200(Depends 00-13/200(Depends on PSU-12V current on PSU-12V current limitlimit ))
Band Noise type2Band Noise type2EMAE+EU-SEMAE+EU-S (FM-AE3+FM-S2)+u-(FM-AE3+FM-S2)+u-
code with CIcode with CINo particular locationNo particular location
10frames / 100frames
P-sum mode P-sum mode 55 columns cycle columns cycle noisenoise
P-sum PRAM P-sum PRAM used in Japan is used in Japan is different from that different from that used in MIT. The used in MIT. The bottom row of bottom row of Imaging area is Imaging area is used. used.
Jan9 eventJan9 event FM-S2+FM-AE2FM-S2+FM-AE2 Jan6-Jan9 noise Jan6-Jan9 noise
level variable. level variable. 21:15 Jan9 big 21:15 Jan9 big jump in the leveljump in the level
In Jan14 RT In Jan14 RT experiment, experiment, recovered to recovered to ~2ADU~2ADU
No particular No particular pattern in the pattern in the frame imageframe image
Kyoto Kyoto FMS1 FMS1 Noise Noise
RMS~ 3-4 RMS~ 3-4 ADUADU
Variable Variable frame to frame to frameframe
RMS~2ADRMS~2ADU in Osaka U in Osaka Experiment Experiment with higher with higher current limitcurrent limit
CimbinationCimbination PRAMPRAM 、、 CICI PSU PSU related issuerelated issue その他その他
StripesStripes Stronger in FM-AE2Stronger in FM-AE233 than than EMEMEven withdumyyCCDEven withdumyyCCD
Band type1Band type1
(200(200 rows near rows near serial registerserial register ))
FM-AE2+dummyFM-AE2+dummy
FM-AE3+dummyFM-AE3+dummy
EM-AE+dummyEM-AE+dummy
Not visible when Not visible when we set parallel we set parallel clock to be zero Vclock to be zero V
-12V PSU voltage drop was -12V PSU voltage drop was observedobserved
Frequency increased with Frequency increased with lower -12V current limit lower -12V current limit
Kyoto Kyoto FM-S1FM-S1 FM-AE1FM-AE1 ?? Not visible with larger Not visible with larger current limit at Osakacurrent limit at Osaka
Jan9 eventJan9 event FM-AE2+FM-S2FM-AE2+FM-S2 Noise level Noise level increased and increased and variesvaries
+24V +24V PSU PSU voltage drop voltage drop was observed was observed
With higher PSU current With higher PSU current limit, not visible during on limit, not visible during on week experimentweek experiment
Band type2Band type2
(( randome locatiorandome locationn ))
FM-AE3+FM-S2FM-AE3+FM-S2 PRAM without CI PRAM without CI eliminated this eliminated this noise noise
Appeared even with higher Appeared even with higher PSU current limitPSU current limit
EM-AE+EU-SEM-AE+EU-S CRT off CRT off eliminateeliminated this noid this noisese