Bulk Metal® Foil Technology Trimming Potentiometers TEMPERATURE C
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Reasons Specify Bulk Metal® Foil Potentiometers
Bulk Metal® Foil Technology Trimming Potentiometers
TEMPERATURE COEFFICIENT RESISTANCE
page
SETTABILITY
page
SETTING STABILITY
page
NOISE
page
NON-INDUCTIVE DESIGN
page
VISHAY FOIL FRANCE +33.4.93.37.28.24 FAX: +33.4.93.37.27.31 GERMANY +49.9287.710 FAX: 9287.70435 ISRAEL +972.3.557.0945 FAX: +972.3.558.9121
ITALY 39.2.300.11919 FAX: +39.2.300.11999 JAPAN +81.42.729.0661 FAX: +81.42.729.3400 SINGAPORE +65.788.6668 FAX: +65.788.0988
SWEDEN +46.8.594.70590 FAX: +46.8.594.70581 8237 FAX: 1953 407-4800 FAX: 640-9081
www.vishay.com
Document Number: 63051 Revision 05-Aug-02
Reasons Specify Bulk Metal® Foil Potentiometers
Bulk Metal® Foil Technology Trimming Potentiometers
INTRODUCTION
Vishay Precision Trimmers have Bulk Metal® Foil resistive element which possesses unique inherent temperature load-life stability. addition, their advanced, virtually backlashfree adjustment mechanism makes them easy quickly accurately keeps setting exactly target. minimizes influence these gradients resistances forming voltage divider, preventing these resistances from drifting apart thereby keeping ratio essentially constant.
REASON
TEMPERATURE COEFFICIENT RESISTANCE (TCR)
Maximum Temperature Coefficient Resistance standard Vishay trimmers (except 1280G 1285G*) 10pm/°C from 55°C 25°C, 10ppm/°C from 25°C 150°C, which five times tighter than required MIL-PRF-39035 characteristic *The 1285G 5ppm/°C 1280G 15ppm/°C
REASON
SETTABILITY
Vishay Trimmers settable within 0.1% maximum. Bulk Metal® Foil flat, smooth surface containing redundant photo-etched current paths which provide essentially infinite resolution enhance settability.
REASON
SETTING STABILITY
multi-fingered wiper-brush rides Bulk Metal® Foil element with preloaded force maintain positive contact. wiper driven through 20:1 worm gear (Model 1240 example) which provides virtually backlash-free resistance adjustment. Together they provide smooth, linear, resistance-rotation characteristic exceptional stability when exposed environmental stresses.
FIGURE VISHAY TEMPERATURE COEFFICIENT RESISTANCE (TCR) COMPARED MILITARY STANDARDS
-55°C
Temperature
+100 +125 +150 +6250
+4000
MILITARY PPM/°C
PPM/°C MAXIMUM CHORD SLOPE
FIGURE 1240 TRIMMER ELEMENT
+800 -800
+1250
(PPM)
-1250
-4000
PPM/°C MILITARY
PPM/°C MAXIMUM CHORD SLOPE -6250
1285G ppm/°C 1280G ppm/°C
This specification result combination Bulk Metal® Foil matched substrate, which produces unusually predictable TCR. real life conditions changing ambient temperature temperature gradients, Vishay trimmers plays important role both application modes: When trimmer used variable resistor (rheostat), keeps resistance value constant independent changes ambient temperature. When trimmer used voltage divider mode, parts trimmer's element different temperatures because temperature gradients created heat dissipated trimmer outside heat sources.
FIGURE 1202 TRIMMER ELEMENT
VISHAY FOIL FRANCE +33.4.93.37.28.24 FAX: +33.4.93.37.27.31 GERMANY +49.9287.710 FAX: 9287.70435 ISRAEL +972.3.557.0945 FAX: +972.3.558.9121
ITALY 39.2.300.11919 FAX: +39.2.300.11999 JAPAN +81.42.729.0661 FAX: +81.42.729.3400 SINGAPORE +65.788.6668 FAX: +65.788.0988
SWEDEN +46.8.594.70590 FAX: +46.8.594.70581 8237 FAX: 1953 407-4800 FAX: 640-9081
Document Number: 63051 Revision 05-Aug-02
www.vishay.com
Reasons Specify Bulk Metal® Foil Potentiometers
Bulk Metal® Foil Technology Trimming Potentiometers
SETTABILITY SETTING STABILITY Continued FIGURE TYPICAL TRIMMER RESOLUTION ELEMENT TYPE
REASON
NON-INDUCTIVE DESIGN
Vishay resistive pattern design flat substrate provides essentially non-inductive component 0.08µH typical; with rise time fast 10ns excellent high frequency applications.
Resistance
FIGURE 1240 CUTAWAY
BULK METAL FOIL
Etched Bulk Metal® element redundant current paths eliminate catastrophic failure. Sealed housing moisture protection solvent resistance. All-welded construction maintains connection integrity under soldering. Multi-fingered wiper. Compression-fitted ring seals adjustment screw opening.
Wiper Travel
Resistance
WIREWOUND
FIGURE 1202 CUTAWAY
Etched Bulk Metal® element redundant current paths eliminate catastrophic failure. Sealed housing moisture protection solvent resistance.
Wiper Travel
Resistance
All-welded construction maintains connection integrity under soldering. Multi-fingered wiper.
CERMET
Compression-fitted ring seals adjustment screw opening.
Wiper Travel
VISHAY TRIMMERS INSPECTED 100% For: Short-time overload (6.25 rated power seconds seconds cycles) Immersion Resistance tolerance check Resistance Visual-Mechanical Dynamic tests for: Continuity, Sample For:
SWEDEN +46.8.594.70590 FAX: +46.8.594.70581 8237 FAX: 1953 407-4800 FAX: 640-9081
REASON
NOISE
flat smooth surface Bulk Metal® Foil, combined with metal-to-metal contact between Bulk Metal® Foil multifingered wiper, provide Vishay Trimmers with extremely noise.
VISHAY FOIL FRANCE +33.4.93.37.28.24 FAX: +33.4.93.37.27.31 GERMANY +49.9287.710 FAX: 9287.70435 ISRAEL +972.3.557.0945 FAX: +972.3.558.9121
ITALY 39.2.300.11919 FAX: +39.2.300.11999 JAPAN +81.42.729.0661 FAX: +81.42.729.3400 SINGAPORE +65.788.6668 FAX: +65.788.0988
www.vishay.com
Document Number: 63051 Revision 05-Aug-02
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