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

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FireFly-IIA User Manual3.10.9 SERVo:AGINGcompensationThis parameter is a coefficient that represents the drift of the EFC needed to compensate the naturaldrift in frequency of the OCXO due to aging. This coefficient is automatically computed and adjustedover time by the Jackson Labs Technologies, Inc. firmware. This command has the following format:SERVo:AGINGcompensation [-10.0, 10.0]3.10.10 SERVo:PHASECOrrectionThis parameter sets the Integral part of the PID loop. Loop instability will result if the parameter isset too high. Typical values are 10.0 to 30.0. This command has the following format:SERVo:PHASECOrrection [-100.0, 100.0]3.10.11 SERVo:1PPSoffsetThis command sets the FireFly-IIA 1PPS signal’s offset to UTC in 16.7ns steps.Using the SERV:1PPS command results in immediate phase change of the 1PPS output signal.This command has the following format:SERVo:1PPSoffset ns3.10.12 SERVo:TRACeThis command sets the period in seconds for the debug trace. Debug trace data can be used withUlrich Bangert’s “Plotter” utility to show UTC tracking versus time etc.This command has the following format:SERVo:TRACe [0,255]An example output is described here:08-07-31 373815 60685 -32.08 -2.22E-11 14 10 6 0x54[date][1PPS Count][Fine DAC][UTC offset ns][Frequency Error Estimate][Sats Visible][SatsTracked][Lock State][Health Status]Please see the SYNChronization? command for detailed information on how to decode the healthstatus indicator values. The Lock State variable indicates one of the following states:ValueState0 OCXO warmup1 Holdover2 Locking (OCXO training)4 [Value not defined]28 © 2012 Jackson Labs Technologies, Inc.
FireFly-IIA User Manual5 Holdover, but still phase locked (stays in thisstate for about 100s after GPS lock is lost)6 Locked, and GPS active3.10.13 SERVo?This command returns the result of the following queries:SERVo:COARSeDac?SERVo:DACGain?SERVo: EFCScale?SERVo:EFCDamping?SERVo:SLOPe?SERVo:TEMPCOmpensation?SERVo:AGINGcompensation?SERVo:PHASECOrrection?SERVo:1PPSoffset?SERVo:TRACe?© 2012 Jackson Labs Technologies, Inc. 29
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