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groups:mg:ring-down_box [2018/01/25 16:12] – ssauergroups:mg:ring-down_box [2018/09/04 12:40] (current) – removed ssauer
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-====== Ring-down Box ====== 
- 
-===== Application of the ring-down box ===== 
-You can measure the finesse of a resonator with the ring-down box **without** locking the resonator! 
-==== Advantages ==== 
-  - super fast (see characterization) 
-  - without locking the resonator 
- 
-{{ :groups:mg:ring-down-box_ohnelambda4.png?800|}} 
-==== Measurement Method ==== 
-==== Evaluation ==== 
-Use this formula to analyse the datapoints:\\ y(x)=A*exp^(-x/t)+y0 with x:=time, t:= delay time\\ 
- 
-Afterwards calculate the finesse with F=2pi*t*FSR with FSR:=free spectral range. 
- 
-===== Electronic setup ===== 
-  * max. Input PD-voltage: +5V or -5V 
-  * Output TTL (Name: inv. Q): 5V 
-  * Power voltage: +/-15 or +/-18V (max.) 
- 
-  * Switch A: //unten = Eingang invertierend, oben = deaktiviert// 
-  * Switch B: //unten = Ringdown Messung, oben = dauer-reset// 
- 
-==== Explanation of the operating principle ==== 
-  * Electronic drawing (PDF-file) 
- 
-{{ :groups:mg:tingdown_scheme.png?500|}} 
- 
-{{:groups:mg:495a548d-5f00-46df-b82c-894fc0d53ffd.jpeg?200|}}{{:groups:mg:fd40b669-4c0f-40cb-afb5-917ffec81bdf.jpeg?200|}}{{:groups:mg:5f110f20-e94f-4138-b73e-453f75279b72.jpeg?200|}}{{:groups:mg:43963974-8504-4a3f-ac14-c45e8ad462b1.jpeg?200|}}{{:groups:mg:5a80eead-8ff1-4818-b0eb-54609a4c0b8a.jpeg?200|}} 
-==== Characterization==== 
- 
-==== List of components ==== 
-  * Inverter: LT1363 
-    * Invert negativ input voltage to positiv 
-    * {{ :groups:mg:1363fa.pdf |Datasheet_LT1363}} 
-    * Power supply: +/-5V 
-  * Comparator: AD8561 
-    * Compare input voltage and threshold value 
-    * {{ :groups:mg:ad8561.pdf |Datasheet_AD8561}} 
-    * Power supply: +/-5V 
-    * High speed timing: 7ns @ 5V 
-  * Flip-Flop: SN74HC74 
-    * Output of trigger 
-    * {{ :groups:mg:sn74hc74.pdf |Datasheet_SN74HC74}} 
-    * Power supply: +5V 
-    * High speed timing: 15ns 
- 
-  * 1x XLR connector 
-  * 1x Power supply +/-5V 
-  * 1x single switch 
-  * 1x double switch 
-  * 3x BNC connctors 
-  * 1x Potentiometer 
-  * 1x big red button 
-  * 2x 8-pin holder 
-  * 1x 14-pin holder 
-  * 3x PSK 3-pin cables 
-  * 5x 100n capacitors 
-  * some resistors (3x 100k, 1x 4.7k, ...) 
-  * 1x Al-box 
-  * 2x PCB´s 
- 
- 
-==== Microwave switch ==== 
- 
-    * Control of RF signal to the AOM 
-    * Mixer typ: SRA-1+ ({{ :groups:mg:sra-1_.pdf |Datasheet_SRA-1+}}) 
-     * 1x Resisitor (100 Ohm) 
-     * 2x diodes (tyo: 1N4748) 
-     * 1x diode (typ: Z3,9V) 
-     * 3x BNC connectors 
-     * 1x Al-Box 
- 
-<note important>But all ground pins on ground, also the housing</note> 
- {{:groups:mg:imagexxl.jpg?300|}}{{:groups:mg:bf165356-8251-4436-b131-b6efceffb0bd.jpeg?300|}}{{:groups:mg:9ef752f7-5989-4c0b-a359-1b3e317a268a.jpeg?300| 
-}} 
- 
-