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7 Operating the 575
Quick Start - Normal Internal Rate Generator Operation
The 575 has a powerful set of functions providing a number of modes of
operation for the internal or “System” rate generator (T
0
). Most of these functions
can be ignored if a simple continuous stream of pulses is required. Starting from
the default settings, which can be restored by recalling configuration 0, the
following parameters need to be set:
Pulse Width, Delay Enter the Channel menus by pressing the letter key.
Enter the required pulse width and delay. Repeat for
each output channel.
T
0
Period
Enter the Rate menu by pressing the
FUNC
key and
then the
RATE
key. Set the desired pulse period.
Note that in general, the pulse delay plus the pulse
width, plus a 75ns hardware reset constant, for any
channel must be less than the T
0
period.
Start
Press the
RUN/STOP
key to start generating pulses.
Stop
Press the
RUN/STOP
key a second time to stop
gen-erating pulses.
Quick Start - Normal External Trigger Operation
To generate a single pulse for every external trigger event, based on the default
configuration 0, the following parameters need to be set:
System Mode
Enter the System Mode menu by pressing the
FUNC
key and then the
MODE
key. Select Single Shot
mode.
Trig
Enter the Trigger menu by pressing the
TRIG
key.
Select Triggered.
Level
Press the
NEXT
key until the Level parameter is
highlighted. Set the trigger threshold voltage to
approximately 50% of the trigger signal amplitude.
Edge
Press the
NEXT
key until the Edge parameter is
high-lighted. Set the instrument to trigger off the rising
edge or falling edge as desired.
