Datapulse 101 - Page 12

I e. Set the GATE MODE switch to the NON—GATED position.
f. Set the PULSE MODE switch to the SGL position.
g. Connect the Datapulse Type 2003 Power Termination or a suitable
50 ohm, 2 watt (minimum) load to the POS OUTPUT jack.
2. 3. 3 Main Pulse Output
a. Set the front panel controls to the preliminary settings in step
2.3.2 (above).
b. Turn the POWER switch ON. The pilot lamp should light.
c. Synchronize the sampling oscilloscope from the REFERENCE
TRIGGER OUTPUT, set the sweep for 0.2 pS/cm and the
amplitude for 2V/cm.
d. Monitor the positive output at the terminating load with a high
impedance probe. A single flat topped pulse 5 cm wide and 5 cm
high with near vertical rise and fall time should appear on the
oscilloscope.
e. Turn the POSITIVE AMPLITUDE control counterclockwise and
note that the amplitude decreases without any noticeable effect
on waveshape down to 2 volts. Return the AMPLITUDE to the
10V position.
f. Disconnect the load from the POS OUTPUT and reconnect it to
the NEG OUTPUT. The negative pulse should look like the
positive pulse inverted on the oscilloscope.
g. Repeat step e (above) for the NEGATIVE AMPLITUDE control.
h. Turn the PULSE WIDTH vernier counterclockwise. The pulse
width should follow the control and decrease successively.
Return the vernier to its clockwise position.
i. Vary the PULSE DELAY vernier. The pulse should move
smoothly left or right, following the control movements.
._ 2.3.4 Double Pulse Mode
I I' a. Turn the unit on with its controls set to the preliminary settings
’ ofstep2.3.2.
b. Set the sampling oscilloscope sweep to 1.0 us /cm and synchronize
' it to the ADVANCED TRIGGER OUTPUT.
c. Set the PULSE MODE switch to the DBL position.