Avtech 14156, Instructions Manual

Page: 26 / 42

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) EXTREME CAUTION SHOULD BE FOLLOWED WHEN USING THIS
INSTRUMENT AS IT GENERATES OUTPUT PULSE AMPLITUDES AS HIGH
AS 3000 VOLTS.
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 may be required 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 50 MHz. Also, the coaxial cable between the SHV output connector and
the load should not exceed about 0.5 meters (or the rise time will be degraded).
d) The load impedance should not be less than 10 kΩ as this will result in possible
damage to the output stages. For test purposes, the test load should be greater
than 10 kΩ. To protect the oscilloscope, two high-voltage resistors should be
26
AVTECH
AVRH-3-B
OUT
SYNC
OUTPUT
AC
POWER
REAL-TIME
OSCILLOSCOPE
CHANNEL A
TRIG
INPUT
scope probe
R1, 10 kΩ,
> 10 Watts
R2, 1 kΩ,
> 1 Watt