User's Manual Part 3

Screen Service SDT 501 UB-C ARK 1-T Operations
May, 2010 v 1.0 Page 3 - 69
Output window
Box
Parameter /
Control
Description Admitted Ranges / Values
RF ON / OFF
Output RF signal enabling. The possible output RF signal status are the following:
• ON;
• RF OFF: automatic switch off of the output signal (refer to Amplifier status);
• OFF: manual switch off of the output signal.
• Green: ON
• Green: RF OFF
• Red: OFF
RF
Frequency
reference
Frequency reference source selector. This command will select the reference source used to lock the
internal clocks (10 MHz and 1 PPS). When set to internal the 10 MHz clock and 1 PPS generator runs
unlocked. When set to external or GPS the 10 MHz clock is locked to the source selected and the 1
PPS counter reset is triggered by the source 1 PPS.
Note: External 10 MHz, 1PPS and GPS shall be connected and locked when the External and GPS are
selected as frequency references.
• External
• Internal
• GPS