Dark testing results for KT7

• PB_KT7_netanal_correct_inductance.pdf: Network analysis with the correct 22 uH inductors assumed
• PB_KT7_boloIV_corrected.pdf: IVs with correct frequencies for the bolometers
• PB_KT7_etf.pdf: Electro-thermal feedback measurements for SqCh8
• Tc.pdf: Initial Tc measurements for KT7

Relevant links to memos related to noise :

• BoloNoiseMemo.pdf
• DfmuxTransferFunctionsMemo.pdf

Noise results 20091022 for first comb (SqCh1, A in other files) :

• PBKT7_20091022-1.pdf : SQUID noise, arbitrary frequencies, T_bath=703mK
• PBKT7_20091022-2.pdf : SQUID noise, bolometer frequencies, T_bath=706mK
• PBKT7_20091022-3.pdf : Bolometers overbiased, G_C=G_N=2, A_c=1.7 A_N~0.6, T_bath=725mK
• PBKT7_20091022-4.pdf : Bolometers ``underbiased'', G_C=G_N=2, A_c=0.3, A_N~0.1, T_bath=729mK
• PBKT7_20091022-5.pdf : Bolometers overbiased, G_C=3, G_N=2, A_c=0.57, A_N~0.6, T_bath=734mK
• PBKT7_20091022-6.pdf : Bolometers overbiased, G_C=2, G_N=3, A_c=1.7, A_N~0.2, T_bath=870mK
• PBKT7_20091022-7.pdf : Bolometers overbiased, G_C=G_N=2, A_c=1.7, A_N~0.6, T_bath=711mK
• PBKT7_20091022-8.pdf : Bolometers overbiased, G_C=G_N=2, A_c=1.7, A_N~0.6, T_bath=243mK
• PBKT7_20091022-9.pdf : Channel 0 90% in transition, channels 1-7 overbiased, T_bath=237mK
• PBKT7_20091022-10.pdf : Channel 0 80% in transition, channels 1-7 overbiased, T_bath=235mK
• PBKT7_20091022-11.pdf : Channel 0 70% in transition, channels 1-7 overbiased, T_bath=235mK
• PBKT7_20091022-12.pdf : Channel 0 60% in transition, channels 1-7 overbiased, T_bath=235mK
• PBKT7_20091022-13.pdf : Channel 1 90% in transition, channels 0, 2-7 overbiased, T_bath=235mK
• PBKT7_20091022-14.pdf : Channel 1 80% in transition, channels 0, 2-7 overbiased, T_bath=235mK
• PBKT7_20091022-15.pdf : Channel 1 70% in transition, channels 0, 2-7 overbiased, T_bath=235mK
• PBKT7_20091022-16.pdf : Channel 1 60% in transition, channels 0, 2-7 overbiased, T_bath=235mK
• PBKT7_20091022-17.pdf : Channel 0-7 80% in transition, T_bath=235mK
• PBKT7_20091022-18.pdf : Channel 0 70% in transition, channels 1-7 80% in transition, T_bath=235mK
• PBKT7_20091022-19.pdf : Channel 0 60% in transition, channels 1-7 80% in transition, T_bath=235mK
• PBKT7_20091022-summary.pdf: summary of all the above

Notes

You can see from the network analysis that there is something going on with SqCh6 channels 2 and 7. 1 Ohm is about the standard, but Ch2 is 1.7 and Ch7 is 0.2. I think this is leading to difficulty overbiasing and taking IVs. The ADC rails quite easily and I have not yet been able to get set a carrier that would keep it normal without the ADC railing.

I see that there does seem to be a trend in the ETF with frequency. Particularly higher frequency leads to shorter time constants. However, this time it instead of a gradual drop with a couple low points at the end it had a couple high points at the start and then a steady gradual drop at lower values.

Data

• 20091022-17.tgz

-- PeterHyland - 27 Apr 2009

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This topic: BolometerTesting > WebHome > PolarBear > 2009_PB_BoloKT7 Topic revision: r7 - 2010-10-09 - FrancoisAubin

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