Avtech AVP-AV-1-B, Instructions Manual

Page: 24 / 40

OPERATIONAL CHECK
This section describes a sequence to confirm the basic operation of the instrument. It
should be performed after receiving the instrument. It is a useful learning exercise as
well.
Before proceeding with this procedure, finish reading this instruction manual
thoroughly. Then read the “Local Control” section of the “Programming Manual for -B
Instruments” thoroughly. The “Local Control” section describes the front panel controls
used in this operational check - in particular, the MOVE, CHANGE, and ADJUST
controls.
BASIC TEST ARRANGEMENT
1. Connect the pulse generator to a sampling oscilloscope as shown above. Note that:
a) The use of 40 dB attenuator at the sampling scope vertical input channel will
insure a peak input signal to the sampling scope of less than 1 Volt. Factory
tests are conducted using two Mini-Circuits model BW-S20W2+ attenuators in
series.
b) The TRIG output channel provides TTL level signals (approximately 0 and
+3V). To avoid overdriving the TRIG input channel of some scopes, a 20 dB
attenuator should be placed at the input to the scope trigger channel.
c) The bandwidth capability of components and instruments used to display the
pulse generator output signal (attenuators, cables, connectors, etc.) should
exceed 10 GHz.
d) Set the oscilloscope to trigger externally with the vertical setting at 100 mV/div
and the horizontal setting at 5 ns/div.
24
AVTECH
PULSER
MAIN OUTPUT
CONNECTOR
TRIG
CONNECTOR
AC
POWER
ALL CABLES: 50 OHM COAXIAL
SAMPLING
OSCILLOSCOPE
BW > 10 GHz
50 OHM INPUT
TRIG
CONNECTOR
40 dB
ATTENUATOR