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DBS9900 User’s Manual
DBS9900 Soft Front Panel
4-5
82-28993 Revision 01
4.2.1
Sample Clock Field Descriptions
Internal Clock Box
This entire box is grayed out except when “Clock Mode” is set to “Internal” or
“External Ref”.
Internal Clock /
Desired Frequency
Eight digit control with scrolling. User enters desired sample clock frequency.
Default is 80,000,000Hz.
Internal Clock / Actual
Frequency
Eight digit display only of sample clock frequency actually produced. Display
is updated when “OK” is pushed.
Internal Clock / OK
Push Button
Updates “Actual Frequency”, “R Counter”, “N Counter”, “HSDIV”, and “LSDIV”
displays to correlate with the “Desired Frequency”.
Internal Clock / R
Counter, N Counter,
HSDIV & LSDIV
Displays the values of the clock registers used to produce the “Actual
Frequency” after pressing ‘OK”.
Clock Mode
Three position target switch that selects “Internal” or “External” clock input or
“External Ref” for the PLL 10MHz reference signal. Note that the reference
signal can be applied only to the “CLK 2” input on the DBS9900 front panel.
Default is ‘Internal”.
External Sample Clock
Box
This entire box is grayed out except when “Clock Mode” is set to “External”.
I/O-1
Two position target switch that selects either the “CLK-1” or “CLK-2” input on
the DBS9900 front panel and feeds it to I/O-1 (module A). Default is “Clk-1”.
I/O-2
Two position target switch that selects either the “CLK-1” or “CLK-2” input on
the DBS9900 front panel and feeds it to I/O-2 (module B). Default is “Clk-1”.
Threshold Box
This entire box is grayed out except when “Clock Mode” is set to “External”.
Clk-1
Bipolar, scrolling control with X.X resolution. Sets threshold voltage for “Clk-1”
external clock input. Default is 0V.
Clk-2
Bipolar, scrolling control with X.X resolution. Sets threshold voltage for “Clk-2”
external clock input. Default is 0V.
Ext Ref
Bipolar, scrolling control with X.X resolution. Sets threshold voltage for the
10MHz external reference signal. Note that this signal is applied to the
DBS9900 front panel Clk-2 input only. Default is 0V. This control is grayed out
except when “Clock Mode” is set to “External Ref.”.
Apply
Any user changes on the soft panel will not take effect until the “Apply” button
is pushed.
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