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

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FireFly-IIA User Manual3.6.7 SYNChronization:IMMEdiateThis command initiates a near-instantaneous alignment of the GPS 1 PPS and Receiver output 1 PPS.To be effective, this command has to be issued while not in holdover.3.6.8 SYNChronization:FEEstimate?This query returns the Frequency Error Estimate, similar to the Allan Variance using a 1000smeasurement interval and comparing the internal 1PPS to GPS 1PPS offset.Values less than 1E-012 are below the noise floor, and are not significant.3.6.9 SYNChronization:LOCKed?This query returns the lock state (0=OFF, 1=ON) of the PLL controlling the OCXO.3.6.10 SYNChronization:OUTput:1PPS:RESET [ON|OFF]This command allows the generation of the 1PPS pulse upon power-on without an external GPSantenna being connected to the unit. By default the unit does not generate a 1PPS pulse until the GPSreceiver has locked onto the Satellites. With the command SYNC:OUT:1PPS:RESET ON the unitcan now be configured to generate an asynchronous 1PPS output after power-on even if a GPSantenna is not connected to the unit. Once the GPS receiver locks, the 1PPS pulse will align itself toUTC by stepping in 10 equally spaced steps toward UTC alignment. The default setting is OFFwhich means the 1PPS pulse is disabled until proper GPS lock is achieved.3.6.11 SYNChronization:health?The SYNChronization:health? query returns a hexadecimal number indicating the system’shealth-status. Error flags are encoded in a binary fashion so that each flag occupies one single bit ofthe binary equivalent of the hexadecimal health-status flag.The following system parameters are monitored and indicated through the health-status indicator.Individual parameters are ‘ored’ together which results in a single hexadecimal value encoding thefollowing system status information:If the OCXO coarse-DAC is maxed-out at 255 HEALTH STATUS |= 0x1;If the OCXO coarse-DAC is mined-out at 0 HEALTH STATUS |= 0x2;If the phase offset to UTC is >250ns HEALTH STATUS |= 0x4;If the run-time is < 300 seconds HEALTH STATUS |= 0x8;If the GPS is in holdover > 60s HEALTH STATUS |= 0x10;If the Frequency Estimate is out of bounds HEALTH STATUS |= 0x20;If the OCXO voltage is too high HEALTH STATUS |= 0x40;If the OCXO voltage is too low HEALTH STATUS |= 0x80;22 © 2012 Jackson Labs Technologies, Inc.
FireFly-IIA User ManualIf the OCXO coarse-DAC is maxed-out at 255 HEALTH STATUS |= 0x1;If the short-term-drift (ADEV @ 100s) > 100ns HEALTH STATUS |= 0x100;For the first 7 minutes after a phase-reset, or a coarsedac change: HEALTH STATUS |= 0x200;If the GPS receiver indicates a strong jamming signal of >=50 HEALTH STATUS |= 0x800;(range is 0 to 255)As an example, if the unit is in GPS holdover, and the OCXO voltage is too high, and the UTC phaseoffset is > 250ns then the following errors would be indicated:1) UTC phase > 250ns: 0x42) OCXO voltage too high: 0x403) GPS in holdover: 0x10‘Oring’ these values together results in:0x40 | 0x10 | 0x4 = 0x54The unit would thus indicate: HEALTH STATUS: 0x54A health status of 0x0 indicates a properly locked, and warmed-up unit that is completely healthy.3.6.12 SYNChronization?This query returns the results of these four queries:SYNChronization:SOURce:MODE?SYNChronization:SOURce:STATE?SYNChronization:LOCKed?SYNChronization:HOLDover:DURation?SYNChronization:health?3.7 DIAGnostic SubsystemThis subsystem regroups the queries related to the diagnostic of the OCXO.The list of the commandssupported for this subsystem is as follows:DIAGnostic:ROSCillator:EFControl:RELative?DIAGnostic:ROSCillator:EFControl:ABSolute?3.7.1 DIAGnostic:ROSCillator:EFControl:RELative?This query returns the Electronic Frequency Control (EFC) output value of the internal referenceoscillator. It returns a percentage value between -100% to +100%.:© 2012 Jackson Labs Technologies, Inc. 23
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FireFly-IIA User Manual - Jackson Labs Technologies, Inc.

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