# For my memeory: # settings of the PCA is as: # DAC Voltage = 12 bits / # register = 40 = shutdown # register = 06 = highest gain/longest shaping # register = 00 = lowest gain/longest shaping # register = 38 = lowest gain/shortest shaping # register = 3E = highest gain/shortest shaping # register = 3F = highest gain/shortest shaping/preamp enable # register = 01 = preamp enable # register = 80 = polarity ===== 20080404 Test with the Note mounted cable connected to chip 2 and 3. no other cables connected and using Anders gadget to pulse odd channel numbers on chip 3 Settings used was: low gain, long shaping, DAC=FFF plots: 1) chip 3 time spectra 2) chip 3 time spectra, y scale expanded 3) chip 2 time spectra, y scale expanded the cross talk is worse than to the non pulsed channels on chip 3 4) chip 3 time spectra with no pulse, y scale expanded note that there is no random noise in this configuration. 5) chip 2 time spectra with no pulse, y scale expanded note that there is no random noise in this configuration. 6) same as 4) but with x-scale expanded 7) same as 5) but with x-sacle expanded there is some noise that could be connected to the clock 8) pedestals and rms. Tests with short shaping time show that 10 MHz sampling is not enough to do serious studies, the pulse is too short to get enough samples on the pulse. highest gain/shortest shaping: 9) chip 3 time spectra 10) chip 2 time spectra ==== 20080407 Tests with the original cable to chip 0 and 1, but without pulsing and the pulsing gadget connected. (files: HPH-s00FFF_0_15.pdf,HPH-s00FFF_1_15.pdf,hph-s00FFF-0_32.pdf) the lemo cables used for signal input are on odd channels on chip 1. Settings = 00FFF 11) chip 0 pulseheights 12) chip 1 pulseheights 13) pedestal summary Test with the original cable connected to chip 0 and 1, but without the pulser gadget connected at the other end. Settings = 00FFF files: HPH-s00FFF_0_15-cable1.pdf HPH-s00FFF_1_15-cable1.pdf hph-s00FFF-cable1.pdf 14) chip 0 pulseheights 15) chip 1 pulseheights 16) pedestal summary Test with 4 different cables Settings = 00FFF 1-cable with no grounded edge, to chip 0,1 (plot ALTRO 1) 2-original cable with home mounted connectors, to chip 2,3 (plot ALTRO 3) 3-cable with a thin grounded edge, to chip 4,5 (plot ALTRO 5) 4-original cable with Note mounted connectors to chip 6,7. (plot ALTRO 7) Swapping cables - the noise seems to follow the cable The cable hang loose with nothing connected in the other end. files: noise-cables.pdf 17) same event for the four diffent cables and worst channel (0) the 25 kHz sinus is still visible in the preamp enable mode. ==== 20080408 high gain, short shaping =S3EFFF cable is Note mounted cable on chip 4,5 and in 22-23 chip 0,1 nogadget means that the pulsing device is not connected to the cable gadget means that the pulsing device is connected to the cable files: HPH-nogadget-s3EFFF_5_15.pdf HTIME-nogadget-s3EFFF_5_15.pdf HPH-gadget-s3EFFF_5_15.pdf HTIME-gadget-s3EFFF_5_15.pdf HPH-gadget-s3EFFF_1_15.pdf HTIME-gadget-s3EFFF_1_15.pdf 18) nogadget - Pulse heights chip 5 19) nogadget - Time spectra chip 5 20) gadget - Pulse heights chip 5 21) gadget - Time spectra chip 5 22) gadget - Pulse heights chip 1 23) gadget - Time spectra chip 1 24) nogadget - pulse heights chip 1 25) nogadget - time spectra chip 1 26) nogadget - expanded time spectra chip 1 27) nogadget - pedastals (home made cable on chips 2&3) ==== 20080409 settings= S00FFF (low gain, long shaping) cabling: note mounted on 0,1; home mounted on 2,3 files: HPH-nogadget-s00FFF_1_15.pdf, HTIME-nogadget-s00FFF_1_15.pdf HTIME-nogadget1-s00FFF_1_15.pdf, hph-nogadget-s00FFF.pdf HPH-gadget-s00FFF_1_15.pdf 28) nogadget - pulse heights chip 1 29) nogadget - time spectra chip 1 30) nogadget - expanded time spectra chip 1 31) nogadget - pedestals 32) gadget - pulse height Pulsing chip1 odd channels files: HPH-pulse-s00FFF_1_15.pdf HTIME-pulse-s00FFF_1_15.pdf HTIME-pulse1-s00FFF_1_15.pdf HTIME-pulse-s00FFF_0_15.pdf HTIME-pulse1-s00FFF_0_15.pdf HTIME-pulse2-s00FFF_1_15.pdf 33) pulse heights chip 1 34) time spectra chip1 35) time spectra chip1 expanded in time 36) time spectra chip0 37) time spectra chip0 expanded 38) time spectra chip1 expanded in height and time pulsed even chips, all saw pulse file HTIME-pulse_6_15.pdf 39) time distribution chip 6 the wiggling thing is due to pulse gadget (removing a lemo cable removes wiggling more or less. removed to channels from being pulsed: files HTIME-pulse1_7_15.pdf HTIME-pulse1_6_15.pdf 40) time spectra pulsed side 41) time spectra non pulsed side preampenable pulse with Note cable chip 6,7- channel 7 not pulsed files: HTIME-pulse-s01FFF_7_15.pdf HTIME-pulse-s01FFF_6_15.pdf HTIME-pulse-s01000_7_15.pdf HTIME-pulse-s01000_6_15.pdf HTIME-pulse1-s01000_7_15.pdf HTIME-nogadget-s01FFF_1_15.pdf 25 kHz is overimposed on the signals for DAC=FFF 42) DAC=FFF chip 7 43) DAC=FFF chip 6 44) DAC=000 chip 7 45) DAC=000 chip 6 46) DAC=000 chip 7 expanded 47) nogadget DAC=FFF Pending problem --------------- To get the ADCCLK enable then one must firt program the PCA16: 1) start serial chain clock 2) write register 1 3) write register 2 4) issue send command after this do the ADCCLK get enabled. Conclusions =========== 1) need to improve cables to reduce cross-talk 2) need to improve on pulsing gadget to avoid noise, and channels to pulse 3) need to find source of spurious noise and 25kHz at preampenable and DAC>>000 4) need to improve an 2.5MHz at shortest shaping times ...