Jackson Labs LC_XO - SERVO Subsystem; Servo:coarsedac; Servo:dacgain; Servo: Efcscale

LC_XO GPSDO User Manual
38 © 2012 Jackson Labs Technologies, Inc.
4.9 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?
4.9.1 SERVo:COARSeDac
This command sets the coarse Dac that controls the EFC. The LC_XO 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]
4.9.2 SERVo:DACGain
This command is used for factory setup.
4.9.3 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.
This command has the following format:
SERVo: EFCScale <float>[0.0 , 500.0]
4.9.4 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]