Jackson Labs FireFly-1A GPSDO, User Manual

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FireFly-1A User Manual
16 © 2011 Jackson Labs Technologies, Inc.
3.8.2 SYSTem:STATus?
This query returns a full page of GPS status in ASCII format. The output is compatible with
GPSCon.
3.8.3 SYSTem:FACToryReset ONCE
This command applies the Factory Reset setting to the EEPROM. All aging, tempco, and user
parameters are overwritten with factory default values.
3.9 SERVO Subsystem
This subsystem regroups all the commands related to the adjustment of the servo loop:
SERVo:COARSeDac <int> [0,225]
SERVo:DACGain <int> [0.1,10000]
SERVo: EFCScale <float>[0.0 , 500.0]
SERVo:EFCDamping <float>[0.0 , 4000.0]
SERVo:SLOPe <NEG | POS >
SERVo:TEMPCOmpensation <float> [-4000.0, 4000.0]
SERVo:AGINGcompensation <float> [-10.0, 10.0]
SERVo:PHASECOrrection <float> [-100.0, 100.0]
SERVo:1PPSoffset <int> ns
SERVo:QUIet <ON | OFF>
SERVo:TRACe <int > [0,255]
SERVo?
3.9.1 SERVo:COARSeDac
This command sets the coarse Dac that controls the EFC. The FireFly-1A control loop automatically
adjusts this setting. The user should not have to change this value.
This command has the following format:
SERVo:COARSeDac <int> [0,225]
3.9.2 SERVo:DACGain
This command is used for factory setup.
3.9.3 SERVo: EFCScale
Controls the Proportional part of the PID loop. Typical values are 0.7 (double oven OCXO) to 6.0
(simple single oven OCXO). Larger values increase the loop control at the expense of increased noise
while locked. Setting this value too high can cause loop instabilities.