AIR TRIMMER CAPACITORS MINIATURE, STANDARD & HIGH VOLTAGE

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1 Description Air dielectric Rated voltage 250 VDC (500 VDC for AT 500 s) Low temperature coefficient Low capacitance drift Very stable over time Terminations gold plated High Q factor Multi-turn, high resolution Self-locking constant torque drive mechanism Compliant to MIL-C-4409 and ESA/SCC 00 compliant High Reliability versions available on special order Maximum Soldering Temperature 260 C, s Max Applications RF amplifiers and oscillators Impedance matching Crystal trimming Filter tuning Interstage coupling Space applications Air trimmers series SERIES MINIATURE AIR TRIMMER STANDARD AIR TRIMMER HIGH VOLTAGE AIR TRIMMER FAMILIES AT 5800 s AT 5850 s AT 5700 s AT 5750 s AT 5200 s AT 5400 s AT 5450 s AT 5500 s AT 5600 s AT 500 s CAPACITANCE RANGE 0.5 to.5 pf > 9 turns 0.5 to 5 pf > 2 turns 0.8 to 6 pf > 7 turns 0.8 to 0 pf 0.8 to 0 pf to 4 pf to 6 pf to 20 pf > 2 turns to 0 pf MIN 00 MHz > 0000 > 7500 > 0000 > 7500 > 5000 > 000 > 000 > 500 > 800 WORKING VOLTAGE 250 VDC 250 VDC > 20 turns to 0 pf > 0 turns > VDC 57

2 I. Miniature air trimmer series AT 5800 AT 580 AT 5802 AT 805 AT 5850 AT 585 AT 5852 AT 585 AT 5700 AT 570 AT 5702 AT 8050 AT 5750 AT 575 AT 5752 AT 575 Capacitance range 0.5 to.5 pf >0 turns 0.5 to 5 pf >2 turns 0.8 to 6.0 pf pf >6 turns 0.8 to 0 pf >9 turns Working voltage 250 VDC Test voltage 500 VDC Working Temp. range -55 C to +25 C Temp. Coefficient 0+/-50 ppm/ C 0+/-50 ppm/ C 0+/-5 ppm/ C 0+/-50 ppm/ C Q Max Capacitance >0000 >7500 > 0000 > 7500 Insulation Resistance >0 6 M min Capacitance change is linear versus rotation of mobile rotor. I. Miniature air trimmer series: quality factor Q factor Typical Q factor of Miniature Air Trimmer series tuned at Max capacitance Frequency MHz AT 5800's AT 5700's 58

3 I.2 Miniature air trimmer series: Mechanical and general specifications AT 5800 AT 580 AT 5802 AT 805 AT 5850 AT 585 AT 5852 AT 585 AT 5700 AT 570 AT 5702 AT 8050 Rotating torque 22 to 220 g.cm 0 to 290 g.cm Max torque on rotor stop 00 g.cm 400 g.cm Nut mounting torque 000 g.cm 000 g.cm Seal cap assembly torque 00 g.cm 600 g.cm Vibrations Shocks 60g, Hz 500g, 0.5 ms Brass and Invar structure Glazed alumina insulation 06 C solder used in assembly Silicone rubber seal washer Gold, silver and chromate finish I. Miniature air trimmer series : models Figure Figure 2 Figure Figure 4 Figure 5 Terminals are gold plated Others models available upon request Figure 6 AT 5750 AT 575 AT 5752 AT 575 Custom designs available upon request 59

4 I.4 Miniature air trimmer series: DIMENSIONS IN MM Fig A B C D E F G H L Thread AT 5800 AT 580 AT 5802 AT 805 AT 5850 AT 585 AT 5852 AT 585 AT 5700 AT 570 AT 5702 AT 8050 AT 5750 AT 575 AT 5752 AT 575 2a 6 2a I.5 Miniature air trimmer series: Sugggested Mounting Holes Figure A Figure B Figure C UNS UNS UNS UNS Figure 2 L M AT 5800, AT 5802, AT 5850, A.2 AT 5852 AT 580, AT 585 C AT 805, AT 585 C...2 AT 5700, AT 5702, AT 5750, A 4.9 AT 5752 AT 570, AT 575 B AT 8050 C AT 575 B

5 II. Standard air trimmer series AT 5200 AT 520 AT 5202 AT 8052 AT 5400 AT 540 AT 5402 AT 805 AT 5450 AT 545 AT 5452 AT 545 AT 5500 AT 550 AT 5502 AT 8054 AT 5600 AT 560 AT 5602 Capacitance range 0.8 to 0 pf to 4 pf to 6 pf to 20 pf > 4 turns to 0 pf >20 turns Working voltage 250 VDC Test voltage 500 VDC Working Temp. range - 55 C to + 25 C Temp. Coefficient 0+/-5 ppm/ C 0+/-25 ppm/ C 0+/-50 ppm/ C 0+/-0 ppm/ C 0+/-0 ppm/ C Q Max Cap. > 5000 > 000 > 000 > 000 > 800 Insulation Resistance >06 M min Capacitance change is linear versus rotation of mobile rotor. II. Standard air trimmer series: quality factor Q factor Typical Q factor of Standard Air Trimmer series tuned at Max capacitance Frequency MHz AT 5200's AT 5400's AT 5500's AT 5600's 6

6 II.2 Standard air trimmer series: Mechanical and general specifications Rotating torque Max torque on rotor stop Nut mounting torque Seal cap assemb. torque Vibrations Shocks AT 5200 AT 520 AT 5202 AT 8052 AT 5400 AT 540 AT 5402 AT 805 AT 5450 AT 545 AT 5452 AT to 50 g.cm 500 g.cm 5000 g.cm 800 g.cm 60g, Hz 500g, 0.5 ms Brass and Invar structure Glazed alumina insulation 06 C solder used in assembly Silicone rubber seal washer Gold, silver and chromate finish II. Standard air trimmer series : Models Figure Figure 2 AT 5500 AT 550 AT 5502 AT 8054 Figure Figure 4 Figure 5 AT 5600 AT 560 AT 5602 Terminals are gold plated. Others models available upon request. Custom design available upon request 62

7 II.4 Standard air trimmer series: Dimensions in mm Figure A B C D E F G H L Thread AT 5200 AT 520 AT 5202 AT 8052 AT 5400 AT 540 AT 5402 AT 805 AT 5450 AT 545 AT 5452 AT 545 AT 5500 AT 550 AT 5502 AT 8054 AT 5600 AT 560 AT a II.5 Standard air trimmer series: Figure A Figure B Figure C Figure D UNS 6

8 Models Fig. 2 L M AT 5200, AT 5202, AT 5400, AT 5402, AT 5450, AT 5452, AT 5500 A, AT 5502, AT 5600,AT 5602 AT 520, AT 540, AT 545, B.. AT 550, B AT 560 D AT 8052, AT 805, AT 8054 C AT 545 B III. High voltage air trimmer series AT 50 AT 502 Capacitance range 0.8 to 0 pf > 0 turns Working voltage 500 VDC Test voltage 000 VDC Working Temp. range -55 C to +25 C Temp. Coefficient 0+/-20 ppm/ C Q Max Cap. > 2000 Insulation Resistance > 0 6 M III. High voltage air trimmer series: Mechanical and general specifications Rotating torque Max torque on rotor stop Nut mounting torque Seal cap assembly torque Vibrations AT 50 AT to 420 g.cm 600 g.cm 7000 g.cm 000 g.cm 60g, Hz Glazed alumina insulation 06 C solder used in assembly Silicone rubber seal washer Gold, silver and chromate finish 64

9 III.2 High voltage air trimmer series : Models Figure Figure 2 Terminals are gold plated Others models available upon request III. High voltage air trimmer series : Dimensions in mm Figure A B C Thread AT UNS AT III.4 High voltage air trimmer series: Sugggested Mounting Holes Figure A Figure B Figure 2 L M AT 50 B AT 502 A 8. 65

10 IV. Soldering and mounting Recommended reflow solder temperature profile Maximum Soldering Temperature 260 C MAX Hand soldering: Use a temperature controlled 40 watts iron set at 260 C maximum. The solder joint should be made on seconds or less. For panel mounting Air Trimmer capacitors (using a nut) minimum circuit thickness is 0.8 mm. V. Recommendations for cleaning VI. Packaging Parts are delivered in bulk and with a standard sealing cap Special sealing caps with screwdriver slot are available except for AT 500 series 66

11 VII. How to order Air trimmer capacitors with standard sealing cap Reference Examples AT 5202 AT 50 Air trimmer capacitors with special sealing cap with screwdriver slot Reference S Examples AT 5702 S AT 580 S VIII. Tuning tools Recommended Tuning Tools references: AT 8766 for AT 5800 and AT 5850 series AT 8777 for all others series Improper screwdriver may damage the internal bushing thread causing rotor binding. IX. Adjusting The maximum torque on rotor stop value should not be exceeded or damage to capacitor may result. Always use the recommended tuning tool. 67