Noise Reduction when Digitial lines are Moved

The following plots show the noise in a SQUID channel rawdump. The first set of figures use cryoboard#17 which is from the new batch with the digitial communication lines shifted slightly away from the heater return plane. The second set of figures repeats this using cryoboard#15 which is from the old batch with the original copper pour.

Figures (1,2) and (3,4) show a reduction in both the communication pickup amplitude and a reduction in the amplitude spectrum when the digital lines are shifted away from the heater return plane.

Figure1: Dfmux 154 SqCh6 rawdump. Using cryoboard 17	Figure2: The corresponding amplitude Spectrum

Figure3: Dfmux 154 SqCh6 rawdump. Using cryoboard 15 with no filterboards	Figure4: The corresponding amplitude Spectrum

Figure5: Dfmux 154 SqCh6 rawdump. Using both filterboards	Figure6: The corresponding amplitude Spectrum

Filter board effects on Signal Heater Channels

The effect of the filter is measured across single heater channels, each with different loads. There appears to be a channel-to-channel difference that depends on the changes in loads. Below are the rawdump data for each channel going from the middle of the board out.

Figure7: 4He Switch 10 kOhms	Figure8: Filtered data


Figure9: Open (no load)	Figure10: Filtered data

Figure11: 1Kohm additional Heater	Figure12: Filtered data

Figure13: 3He Ultra pump 200 ohms	Figure14: Filtered data

Figure15: 3He Inter pump 400 ohms	Figure16: Filtered data

Figure17: 3He Ultra Pump Switch 10 kohms	Figure18: Filtered data

Figure19: 3He Inter Pump Switch 10 kohms	Figure20: Filtered data

* SqCh6 _ts_3heISW_10k_filter.png:

Attachments

Topic attachments
I	Attachment	Action	Size	Date	Who
png	SqCh6_amp_3heISW_10k_filter.png	manage	33.7 K	2011-09-20 - 22:24	JamesKennedy
png	SqCh6_amp_board15_nofilt.png	manage	25.7 K	2011-09-20 - 21:13	JamesKennedy
png	SqCh6_amp_both_filters.png	manage	32.9 K	2011-09-20 - 21:13	JamesKennedy
png	SqCh6_amp_filter_open_infK.png	manage	42.5 K	2011-09-20 - 22:24	JamesKennedy
png	SqCh6_board17.png	manage	38.1 K	2011-09-20 - 21:13	JamesKennedy
png	SqCh6_board17_ts.png	manage	27.6 K	2011-09-20 - 21:13	JamesKennedy
png	SqCh6_ts_3heISW_10k_filter.png	manage	42.2 K	2011-09-20 - 22:28	JamesKennedy
png	SqCh6_ts_3heISW_10k_nofilter.png	manage	38.4 K	2011-09-20 - 22:04	JamesKennedy
png	SqCh6_ts_3heI_200_filter.png	manage	34.6 K	2011-09-20 - 22:24	JamesKennedy
png	SqCh6_ts_3heI_200_nofilter.png	manage	30.7 K	2011-09-20 - 22:04	JamesKennedy
png	SqCh6_ts_3heUSW_10k_filter.png	manage	42.5 K	2011-09-20 - 22:24	JamesKennedy
png	SqCh6_ts_3heUSW_10k_nofilter.png	manage	39.3 K	2011-09-20 - 22:04	JamesKennedy
png	SqCh6_ts_3heU_400_filterpng.png	manage	35.2 K	2011-09-20 - 22:24	JamesKennedy
png	SqCh6_ts_3heU_400_nofilter.png	manage	31.5 K	2011-09-20 - 22:04	JamesKennedy
png	SqCh6_ts_board15_nofilt.png	manage	30.9 K	2011-09-20 - 21:13	JamesKennedy
png	SqCh6_ts_both_filters.png	manage	29.0 K	2011-09-20 - 21:13	JamesKennedy
png	SqCh6_ts_filter_1k.png	manage	37.4 K	2011-09-20 - 22:24	JamesKennedy
png	SqCh6_ts_filter_4heSW_10k.png	manage	43.5 K	2011-09-20 - 22:24	JamesKennedy
png	SqCh6_ts_nofilter_1k.png	manage	33.5 K	2011-09-20 - 22:04	JamesKennedy
png	SqCh6_ts_nofilter_4heSW_10k.png	manage	38.7 K	2011-09-20 - 22:04	JamesKennedy
png	SqCh6_ts_nofilter_open_infK.png	manage	37.7 K	2011-09-20 - 22:04	JamesKennedy

This topic: CryoElectronics > WebHome > Rev2_BolometerNoise > Sept20_Filter_board_tests Topic revision: r1 - 2011-09-20 - JamesKennedy