9200 Manual Version 1.2 | Quantum Composers
Page 9
Channel Timer Functions
The Channel Timer functions as a non-retriggerable, delayed, one shot pulse generator. This
means that the timer will only generate one delayed pulse for every start pulse received.
Once the channel timer has started counting, additional start pulses will be ignored until the
pulse has been completed (non-retriggerable). The start pulse for each channel is provided
by the internal T
0
pulse generated by the internal system timer. Whether or not a pulse is
generated for each T
0
pulse is determined by the Channel Mode Generator. Standard modes
include:
Normal
A pulse is generated for each T
0
pulse.
Single Shot
One pulse is generated for the first T
0
pulse, after
which the output is inhibited.
Burst
‘N’ number of pulses are generated for each T
0
pulse, after which the output is inhibited.
Duty Cycle
‘N’ number of pulses are produced, one for each
T
0
pulse, after which
‘M’ number of pulses will be
inhibited, one for each
T
0
pulse. The cycle is then
repeated for each subsequent
T
0
pulse.
A Different mode may be selected for each channel, allowing a wide variety of output
combinations. Each output may also be independently disabled or gated (using the external
gate input).
Digital Output Multiplexer
The outputs of each of the Channel Timers are routed to a set of multiplexers. This allows
routing of any or all Channel Timers to any or all of the units’ outputs. In the normal mode of
operation, the output of the n
th
Channel Timer is routed to the n
th
output connector. As an
example, if a double pulse is required on Channel A, one can multiplex the Channel A timer
with the Channel B timer, then adjust each timer to provide the necessary pulses.
Only the
timing parameters are multiplexed together, not the actual output amplitudes.
Dependent & Independent Timing Events (Sync Function)
The 9200 allows the user to control the relationship between the Channel Timers by setting
the sync source for each timer. Independent events are all timed relative to the internal T
0
start pulse. Dependent events may be linked together by setting the sync source to the
controlling event. This allows the instrument to match the timed events and adjustments can
be made in one event without detuning the timing between it and the dependent event.