FireFly-IIA User Manual - Jackson Labs Technologies, Inc.

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FireFly-IIA User Manual5.4 Interpreting the DataFigure 5.5 shows the data acquired by the FireFly-IIA unit over a period of more than 200 hours Thered trace is EFC (crystal frequency control voltage). The crystal is aging (becoming faster infrequency over time). This requires the control voltage to be lowered to maintain 10.0MHz exactly.A drift of ~2mV is visible over 200 hours. On the left side of the screen the EFC range over this 200hour plot is displayed vertically as 0.00193V. This means the drift of the EFC voltage due to aging is~88mV per year. The EFC sensitivity of the crystal is about 8Hz per volt, so the crystal ages at:At 10MHz:8Hz/V * 0.088V/Year = 0.704Hz/Year drift.0.704Hz / 10MHz = 7.04E-08 aging rate per year.This is the same as 0.2ppb drift due to aging per day.This crystal aging is fully compensated by thefirmware with and without GPS reception of course.The OCXO heater current is shown in turqoise. We can see it ranges from 0.135607A to 0.178146A.The OCXO current jumps lower every 24 hours because the unit is sitting next to a window, and thesun shines onto the OCXO in the evenings, heating it up, and thus making the unit use lower powerduring that event.In Figure 5.6, which is a zoom of Figure 5.5, we can see the phase offset error of the internal OCXOto the UTC GPS reference. We can see the maximum drift is -77ns to +93ns. The average is (TIav=-0.03ns). The standard deviation over the 200 hour plot is sd=11ns. This means the average errorof the 10MHz phase of this unit over 200 hours is only +/-11ns rms. Or, in other words the averagejitter (wander) over 200 hours of operation is:11ns / 200Hrs = 1.528E-014or in other words the unit performs as well as a high quality Cesium Atomic reference clock overlong periods of time. The unit disciplines its internal 10MHz reference to within less than +/-80nspeak to peak of UTC at all times, which is less than one complete clock cycle at 10MHz.46 © 2012 Jackson Labs Technologies, Inc.
FireFly-IIA User Manual6Certification andWarranty6.1 CertificationJackson Labs Technologies, Inc. certifies that this product met its published specifications at time ofshipment.6.1.1 WarrantyThis Jackson Labs Technologies, Inc. hardware product is warranted against defects in material andworkmanship for a period of 1 (one) year from date of delivery. During the warranty period JacksonLabs Technologies, Inc. will, at its discretion, either repair or replace products that prove to bedefective. Jackson Labs Technologies, Inc. does not warrant that the operation for the software,firmware, or hardware shall be uninterrupted or error free even if the product is operated within itsspecifications.For warranty service, this product must be returned to Jackson Labs Technologies, Inc. or a servicefacility designated by Jackson Labs Technologies, Inc. Customer shall prepay shipping charges (andshall pay all duties and taxes) for products returned to Jackson Labs Technologies, Inc. for warrantyservice. Except for products returned to Customer from another country, Jackson Labs Technologies,Inc. shall pay for return of products to Customer. If Jackson Labs Technologies, Inc. is unable, withina reasonable time, to repair or replace any product to condition as warranted, the Customer shall beentitled to a refund of the purchase price upon return of the product to Jackson Labs Technologies,Inc.6.1.2 Limitation of WarrantyThe foregoing warranty shall not apply to defects resulting from improper or inadequate maintenanceby the Customer, Customer-supplied software or interfacing, unauthorized modification or misuse,opening of the instruments enclosure or removal of the instruments panels, operation outside of theenvironmental or electrical specifications for the product, or improper site preparation andmaintenance. JACKSON LABS TECHNOLOGIES, INC. SPECIFICALLY DISCLAIMS THEIMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR© 2012 Jackson Labs Technologies, Inc. 47
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Page 29 and 30: FireFly-IIA User ManualIf the OCXO
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Page 37 and 38: FireFly-IIA User Manual4Firmware Up
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Page 41 and 42: FireFly-IIA User ManualFigure 4.4Fl
Page 43 and 44: FireFly-IIA User ManualFigure 4.6Ex
Page 45 and 46: FireFly-IIA User Manual5GPSCon Util
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Page 54: FireFly-IIA User ManualPURPOSE. No

FireFly-IIA User Manual - Jackson Labs Technologies, Inc.

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