Jackson Labs FireFly-1A GPSDO, Руководство пользователя

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© 2011 Jackson Labs Technologies, Inc. 17
FireFly-1A User Manual
This command has the following format:
SERVo: EFCScale <float>[0.0 , 500.0]
3.9.4 SERVo:EFCDamping
Sets the Low Pass filter effectiveness of the DAC. Values from 2.0 to 50 are typically used. Larger
values result in less noise at the expense of phase delay.This command has the following format:
SERVo:EFCDamping <float>[0.0 , 4000.0]
3.9.5 SERVo:SLOPe
The parameter determines the sign of the slope between the EFC and the frequency variation of the
OCXO. This parameter should be set to match your OCXO’s EFC frequency slope. This command
has the following format:
SERVo:SLOPe <NEG | POS >
3.9.6 SERVo:TEMPCOmpensation
This parameter is a coefficient that reflects the correlation between the Current provided to the
OCXO and the EFC. This coefficient is automatically computed and adjusted over time by the
Jackson Labs Technologies, Inc. firmware. This command has the following format:
SERVo:TEMPCOmpensation <float> [-4000.0, 4000.0]
3.9.7 SERVo:AGINGcompensation
This parameter is a coefficient that represents the drift of the EFC needed to compensate the natural
drift in frequency of the OCXO due to aging. This coefficient is automatically computed and adjusted
over time by the Jackson Labs Technologies, Inc. firmware. This command has the following format:
SERVo:AGINGcompensation <float> [-10.0, 10.0]
3.9.8 SERVo:PHASECOrrection
This parameter sets the Integral part of the PID loop. Loop instability will result if the parameter is
set too high. Typical values are 10.0 to 30.0. This command has the following format:
SERVo:PHASECOrrection <float> [-100.0, 100.0]
3.9.9 SERVo:1PPSoffset
This command sets the FireFly-1A 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 <int> ns