====== Phase Noise Measurement ====== * We measured the phase noise with FSWP from "Rohde und Schwarz". Manual:{{ :groups:mg:fswp_dat-sw_en_3607-2090-22_v0400.pdf |}}\\ * Information about the measurements is in the ResLab book on the pages 134 - 136 (date: 18.08.2016). * measurement: * each device was measured directly behind the output, except it's mentioned * use SMA-cables instead of BNC-cables if possible, thighten the SMA-plug with an open-end wrench, use golden SMA-I-Connection (better quality) * don't wiggle the cable -> results in noise in the range of 1Hz - 200Hz * let the cable swing off bevor starting the measurement * check before the measurement, if the dBm number isn't too high for the device * analysis method: * Program "phasenoise_combined.nb" is located in the AFS * Copy the program into the folder with the data, which needs to be analyzed and start the program * physical units: * dB: epresses the ratio of two values of a physical quantity * dBc (decibels relative to the carrier): power ratio of a signal to a carrier signal, expressed in decibels(dB) * dBm: abbreviation for the power ratio in decibels (dB) of the measured power referenced to one milliwatt * [[.:Nächstes Mal Messen|Nächstes Mal Messen]] - Wie hatten wir die Datei gespeichert? Beim nächsten mal Messen: klären wie gut die Geräte bei anderen Frequenzen funktionieren? Kabel überprüfen, Frequenzen hinter Originalkabel bis hin zum zum Beipsiel AOM prüfen, Steckverbinder wie BNC-I überprüfen ====== 1 10MHz OCXO doubling ====== ===== 5MHz-OXCO moving cable test ===== {{ :groups:mg:5mhz_moving_cable_test.pdf |}}\\ {{:groups:mg:5mhz_moving_cable_test.jpg|}} * 5mhz moving cable test.DAT: 4.999.999,822782 Hz [18.08.2016] * 5mhz without moving.DAT: 4.999.999,825716 Hz [18.08.2016] **Information:** Influence on the cable from 1Hz to 100Hz; probably no more from 200Hz ===== 5MHz-OCXO to 10MHZ ===== {{ :groups:mg:5mhz-ocxo_the_way_to_10mhz.pdf |}}\\ {{:groups:mg:5mhz_ocxo_the_way_to_10mhz.jpg|}} * 5mhz + amp.DAT: 5.000.000,518799 Hz [18.08.2016] * 5mhz.DAT: 4.999.999.825716 Hz [18.08.2016] * 5mhz + doubler + amp.DAT: 9.999.999,658937 Hz [18.08.2016] * 5mhz + doubler.DAT: 9.999.999,651068 Hz [18.08.2016] * 5mhz + splitter.DAT: 4.999.999,820720 Hz [18.08.2016] **Question:** \\ What was measured with 5MHz OCXO?\\ What is meant by splitter? ===== 5MHz-OCXO to 10MHz again ===== {{ :groups:mg:5mhz_to_10mhz_ocxo_again.pdf |}}\\ {{:groups:mg:5mhz_to_10mhz_ocxo_again.jpg|}} * after ocxo and doubler.DAT: 10.000.000,353714 Hz [22.08.2016] * after ocxo.DAT: 4.999.999,838434 Hz [22.08.2016] * ocxo 3.DAT: 4.999.999,834145;Hz [22.08.2016] **Information:** measurement of the final 5MHz doubling on another day as a comparison ===== 5MHz OCXO with/without original power supply ===== {{ :groups:mg:5mhz_ocxo_with_without_original_power_supply.pdf |}}\\ {{:groups:mg:5mhz_ocxo_with_without_original_power_supply.jpg|}} * 5mhzrg58smaocxo.DAT: 4.999.999,836230 Hz [18.08.2016] direkt measurement of the new 5MHz OCXO without separate power supply * 5mhzrg58smaocxo w k+k supply ext supply.DAT: 4.999.999,830501 Hz [18.08.2016] 5MHz OCXO with separate power supply, but K+K power supply was turned on and OCXO was located in the Rack * 5mhzrg58smaocxo wo k+k supply ext supply.DAT: 4.999.999,824645 Hz [18.08.2016] 5MHz OCXO with separate power supply, but K+K power supply was turned off ===== 10MHz amplifier ===== {{ :groups:mg:10_mhz_amplifier.pdf |}}\\ {{:groups:mg:10mhz_amplifier.jpg|}} * 10mhz amp.DAT: 9.999.999,652707 Hz [18.08.2016] * 10mhz amp mass_002.DAT: 9.999.999,686110 Hz [19.08.2016] measurement of another day * 10mhz amp mass.DAT: 9.999.999,651541 Hz [18.08.2016] **Question:** What was the problem? ====== 2 Rb clock ====== {{ :groups:mg:rb_clock.pdf |}}\\ {{:groups:mg:rb_clock.jpg|}} * rb 10 mhz links.DAT: 9.999.999,682126 Hz [22.08.2016] left BNC-connector * rb 10 mhz rechts.DAT: 9.99.999,681785 Hz [22.08.2016] right BNC-connector * rb 5 mhz 2.DAT: 4.999.999,836086 Hz [22.08.2016] * rb 5 mhz.DAT: 4.999.999,850747 Hz [22.08.2016] ** Question:** Referenced to what? \\ **Note:** "rb 5 mhz 2.DAT" and "rb 5 mhz.DAT" are the same, measured at different times ====== 3: 10 MHz distribution ====== {{ :groups:mg:10mhz_distribution.pdf |}}\\ {{:groups:mg:10mhz_distribution.jpg|}} * 10mhz atomslab.DAT: 9.999.999,686110 Hz [18.08.2016] * 10mhz k&k verteiler.DAT: 9.999.999,651353 Hz [18.08.2016] referenced to generated 10MHz signal * 10mhz ocxo stab indirect synth 2.DAT: 9.999.999,673212 Hz [22.08.2016] * 10mhz ocxo stab synth.DAT: 9.999.999,673767 Hz [22.08.2016] * 10mhz selbst.DAT: 9.99.999,650255 Hz [18.08.2016] self-construktion distributor, referenced with OCXO 10MHz, very bad at 1 - 10Hz -> probably influenced by other labatories (powersplitter were used instead of buffer outputs?) * 10mhz selbst no others.DAT: 9.999.999,640838 Hz [18.08.2016](= 10MHz selbs.DAT) self-construktion distributor without other labatories * ocxo 3.DAT: 4.999.999,834145 Hz [22.08.2016] **Question:** \\ What was measured with "10mhz ocxo stab indirect synth 2.DAT", "10mhz ocxo stab synth.DAT" and "ocxo 3.DAT"?\\ They need to be looked at in the original condition in the AFS! ====== 4: 10 MHz synthesizer ==== {{ :groups:mg:10mhz_synthesizer.pdf |}}\\ {{:groups:mg:10mhz_synthesizer.jpg|}} * 10mhz internal synth 2.DAT: 10.000.000,225102 Hz [22.08.2016] * 10mhz ocxo stab indirect synth 1.DAT: 9.999.999,677410 Hz [22.08.2016] * 10mhz ocxo stab synth 2.DAT: 9.999.999,672932 Hz [22.08.2016] * 10mhz ocxo stab synth 3.DAT: 9.999.999,672579 Hz [22.08.2016] * 10mhz open synth 2.DAT: 9.999.474,907956 Hz [22.08.2016] ====== 5.1 Resonator ====== {{ :groups:mg:r2.pdf |}}\\ {{:groups:mg:r2.jpg|}} * eom r2 sznth.DAT: 16.200.005,142169 Hz [24.08.2016] * synth. r2 aom refext..DAT: 77.099.997,538021 Hz [22.08.2016] * synth. r2 aom refext. richtig.DAT: 77.099.997,514594 Hz [22.08.2016] ====== 5.2 Pound-Breher-Hall for resonator 1 ====== {{ :groups:mg:pdh.pdf |}}\\ {{:groups:mg:pdh.jpg|}} * pdhlock2.DAT: 13.810.003,192828 Hz [23.08.2016] * pdhlock.DAT: 13.817.786,393137 Hz [23.08.2016] * pdhlock int.DAT: 13.810.004,243357 Hz [23.08.2016] * pdhunlocked.DAT: 13.60.299,455637 Hz [23.08.2016] ====== 6 Resonator 1 and 2 ====== {{ :groups:mg:r1-r2.pdf |}}\\ {{:groups:mg:r1-r2.jpg|}} * synt. r1-r2 10mhz ext. direkt.DAT: 340.999.989,006932 Hz [22.08.2016] * synz. r1-r2 10mhz ext. indirekt.DAT: 340.99.989,008668 Hz [22.08.2016] * synt. r1-r2 internal.DAT: 341.000.016,201303 Hz [22.08.2016] ====== 7 rep rate ====== {{ :groups:mg:rep_rate.pdf |}}\\ {{:groups:mg:rep_rate.jpg|}} * synth. rep rate 10mhz ext. direkt.DAT: 1.000.000.248,806976 Hz [22.08.2016] * synth. rep rate 10mhz ext. direkt with 10mhz with real cable.DAT: 1.000.000.249,473547 Hz [22.08.2016] * synth. rep rate 10mhz ext. indirekt.DAT: 1.000.000.248,770376 Hz [22.08.2016] * synth. rep rate 10mhz ext. indirekt with real cable.DAT: 999.997.802,893996 Hz [22.08.2016] * synth. rep rate 10mhz ext. indirekt with real cable with 10mhz.DAT: 1.000.000.249,567324 Hz [22.08.2016] * synth. rep rate internal.DAT: 1.000.000.282,423948 Hz [22.08.2016] ====== 8 fiber stabilization====== {{ :groups:mg:fiber_stabilization.pdf |}}\\ {{:groups:mg:fiber_stabilization.jpg|}} * synth. fiber stab. ext. mod.DAT: 79.110.937,461429 Hz [22.08.2016] * synth.fiber stab. refext..DAT: 79.110.997,261913 Hz [22.08.2016] ====== 9 Atomlab ====== {{ :groups:mg:atom-lab.pdf |}}\\ {{:groups:mg:atom-lab.jpg|}} * 10mhz atomslab.DAT: 9.999.999,686110 Hz [18.08.2016] referenced to OCXO * 80 mhz.DAT: 79.110.997,503162 Hz [18.08.2016] referenced to 10MHz (= 10MHz atomslab.DAT) * chlocksynth.DAT: 87.169.997,232243 Hz [18.08.2016] referenced to 10MHz (= 10MHz atomslab.DAT) * wutz.DAT: 104.673.996,567979 Hz [22.08.2016] synthesizer for shifter - AOM **Observation**: at 1000Hz there's a jump --> correlation of "10mhz atomslab.DAT" and "clocksynth.DAT" ===== AOM ===== {{ :groups:mg:aom.pdf |}}\\ {{:groups:mg:aom.jpg|}} * aom rf atomlab nach abschwaecher.DAT: 87.169.997,264110 Hz [22.08.2016] * aom rf atomlab nach kabelende.DAT: 87.169.997,256448 Hz [22.08.2016] * aom rf atomlab nach verstaerker.DAT: 87.169.997,268579 Hz [22.08.2016] ====== 10 synthesizer von Q-Port ====== {{ :groups:mg:qport.pdf |}}\\ {{:groups:mg:qport..jpg|}} * qport internal.DAT: 987.732.665,994588 Hz [22.08.2016] * qport 10mhz ext. direkt stab. auf ocxo.DAT: 987.733.301,133802 Hz [22.08.2016] * qport 10mhz ext.internal.DAT: 987.733.301,151171 Hz [22.08.2016]