2. Adjust the 1407 PULSE HEIGHT until the AMP OUTPUT amplitude is +
9.9 to +10.1 volts.
3. Place jumper plug J4 in the 93 ohm position. Connect a 93 ohm terminator to
the “tee” connector at the scope input. The amplitude of the pulse should be
+4.8 to –5.2 volts. Remove the 93 ohm terminator.
4. Place jumper plug J4 in the 0 ohm position.
5. Connect the 93 ohm terminator; the amplitude should not decrease by more
than 100 mV. There should be no discernible distortion in the pulse shape.
Remove the terminator.
6. Remove all 1407 ATTENUATION. The AMP OUTPUT pulse should be
clamped at +11.5 to +12.5 volts.
7. Set the 1407 ATTENUATION to X10.
Pole/Zero Adjustment
1.
Set the 1407 FALL TIME to 50 µs.
2. Observe the AMP OUTPUT on the scope and adjust the pole/zero control so
that the tail of the unipolar pulse returns to the baseline as fast as possible
with NO under or overshoot, as in Figure 18.
23
Amplifier Operational Checks
Figure 18 Pole/Zero Adjust
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