280 Keysight M8000 Series of BER Test Solutions User Guide
5 Setting up Generator
Setting the Bit Rate
You can use an external clock source or the M8020A/M8030A/M8040A's
internal clock to control the bit rate.
To set the bit rate:
1Go to Menu Bar > Clock and then Clock Generator.
2 Select Synthesizer function block from the Parameter window.
3 Select the appropriate clock source from the following options:
• Internal - When clock source is selected as Internal, an internal
clock oscillator is used. For the internal clock source, different
reference clock sources are available for the internal oscillator.
When the Reference frequency is selected as Internal 100 MHz, then
100 MHz Reference clock of M8041A/ M8045A module is used and
when Reference frequency is selected as AXIe 100 MHz, then
100 MHz reference clock of M950XA AXIe chassis is used.
• Reference - To use clock source as Reference, we need to connect
external reference clock source to Ref Clk In port of M8041A/
M8045A module. Depending upon the connected clock source, you
have to choose between either 100 MHz reference frequency or
10 MHz reference frequency.
• Direct - To use Clock source as Direct, you need to connect external
clock source to Ref Clk In port of M8041A/ M8045A port. Enter the
frequency of the clock source as the Reference frequency. Also, you
can use the Execute button to measure the frequency of the
connected clock source. This connects the external clock directly to
the clock generator at 8.1 GHz to 16.20 GHz.
• Clock Multiplier - To use the clock source as Clock Multiplier, you
need to connect external clock source to the Ref Clk In port of the
M8041A/ M8045A module and then specify the reference frequency.
You can generate the specific frequency by choosing multiplier and
divider value. Also, you can use the Execute button to measure the
frequency of the connected clock source.
4 For Direct clock source, click Execute button to measure the incoming
clock’s clock rate.
5 Select a clock rate:
• For Internal Clock Source, you can enter a clock rate in the Value
and Units field.
• For 10/100 MHz Ref Clock Source, the clock connected to the
10/100 MHz Ref In port must be 10/100 MHz.
The selected clock rate applies to the generator. This is also the clock rate
generated at the generator's Clock Out port.
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