Avtech AVO-6-B, Instructions Manual

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distortion may be appear on the waveform if this technique is used. This alternative test
arrangement is shown below:
If the AVO-6HZ-B is operated at its maximum duty cycle, the worst-case power
dissipation in the output module is (110V × 10A × 5%) = 55 Watts. The internal fan
must have sufficient external ventilation to cool the module. The DB-9 control cable
must be connected as shown above for the fan to operate.
- SMA OPTION
On units with the -SMA option, the standard OUT and GND solder terminals are
replaced with a single SMA female connector (with the OUT signal on the center
conductor, and the connector shield being GND). This is only suitable for connecting to
very short lengths of cable (less than 12 inches or 30 cm), since it is located after the
impedance-matching resistance. Any length of cabling will introduce transmission line
reflections due to the impedance mismatch. The cable will act as an inductance. The
load should be located as close as possible to the output connector (regardless of
whether solder terminals or the SMA connector is used).
If the user wishes to solder something close to this connector, the Amphenol 132140
male-SMA-to-solder-cup adapter could be used.
BASIC PULSE CONTROL
This instrument can be triggered by its own internal clock or by an external TTL trigger
signal. In either case, two output channels respond to the trigger: OUT and SYNC. The
OUT channel is the signal that is applied to the load. Its amplitude and pulse width are
variable. The SYNC pulse is a fixed-width TTL-level reference pulse used to trigger
23
OUT
AVTECH
AVO-6HZ-B
MAINFRAME
Five
5-foot RG-58
coaxial cables
6-foot DB-9
control cable
SYNC
OUTPUT
AC
POWER
REAL-TIME
OSCILLOSCOPE
CHANNEL A
TRIG
INPUT
AVO-6HZ-T
OUTPUT
MODULE
GND
OUT
scope
probe
1 Ohm
IN
CONTROL
CONTROL
Diode (device under test),
oriented for positive operation.
Reverse for negative operation.