12778474-002-2 Revision F – March 2004
TSG-3800 User’s Guide
99
Operating the TSG-3800
Provisioning the Clock Modules
where
{number}
is:
25 to 1000 for Stratum 3E
100 to 5000 for Stratum 2 (quartz)
500 to 10000 for Stratum 2E (Rubidium)
MIN for minimum or MAX for maximum loop time constant
Example
Purpose: Set Clock A’s time constant to 550.
Command:
CLK A TC 550
A typical display is:
->CLK A TC 550
«date» «time» «oper» Set Clk A Time Constant to 550, was 100
>
Provisioning the Control Value for the Clock Module
The Control Value for the clock control loop is a digital number that is applied to the
Direct Digital Synthesizer (DDS) circuit, which sets the clock’s output frequency.
This number is generated by the clock control loop algorithm and is applied to the
Clock module. You can display this number using the CLOCK CV command. You
can change this number only when the control loop is in the USER HALT mode.
Changes to the Control Value directly affect the output frequency by 2.2 x 10E
-12
per step.
To display the current digital control value of the clock:
CLOCK A|B CV
then press
Enter
A typical display is:
->CLK CV
The Current Time is «date» «time»
The Control Value for Clk A is -168 (49%)
The Control Value for Clk B is -1558 (49%)
->
Note:
The TSG-3800 sends an error message asking for a
time constant (tau) within the proper range if an invalid
number is entered.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com