PulseBlasterDDS-I-300
Testing the PulseBlasterDDS-I-300
Once your board is installed properly, the functionality of the device can be tested using three example programs
available from the SpinCore website. All output sequences generated by test programs can be verified using an
oscilloscope.
If you are using a high input impedance oscilloscope to monitor the PulseBlasterDDS-I-300's output, place a resistor
that matches the characteristic impedance of the transmission line in parallel with the coaxial transmission line at the
oscilloscope input by attaching it to the line through a T-Adapter(e.g., a 50 Ω resistor with a 50 Ω transmission line, see
Figures 3 and 4 below). For ease of observing the pulsed RF signals, the oscilloscope should be triggered by any of the
TTL outputs. When using an oscilloscope with an adjustable bandwidth, set the bandwidth to as large as possible. Failure
to do so may yield inaccurate readouts on the oscilloscope.
http://www.spincore.com
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2017-11-14
Figure 3:
Left: BNC T-Adapter and Right: BNC 50 Ohm
resistor.
