INTRODUCTION
The AVO-6HF-B is a high performance, GPIB and RS232-equipped instrument capable
of generating 0 to 5 A at repetition rates up to 100 kHz. The pulse width is variable from
50 ns to 50 us, and the duty cycle may be as high as 4%. Rise and fall times are fixed
at less than 12 ns. The AVO-6HF-B includes an internal trigger source, but it can also
be triggered or gated by an external source. A front-panel pushbutton can also be used
to trigger the instrument.
The AVO-6HF-B features front panel keyboard and adjust knob control of the output
pulse parameters along with a four line by 40-character backlit LCD display of the
output amplitude, pulse width, pulse repetition frequency, and delay. The instrument
includes memory to store up to four complete instrument setups. The operator may use
the front panel or the computer interface to store a complete “snapshot” of all key
instrument settings, and recall this setup at a later time.
The instrument is protected against overload conditions by an automatic control circuit.
An internal power supply monitor removes the power to the output stage for five
seconds if an average power overload exists. After that time, the unit operates normally
for one second, and if the overload condition persists, the power is cut again. This cycle
repeats until the overload is removed.
The AVO-6HF-B consists of two parts, the mainframe and the output module. The
mainframe is a voltage pulser, which generates up to 250V (V
OUT
). Instruments with the
"-P" model suffix can generate up to +250V, whereas instruments with the "-N" model
suffix can generate up to -250V. Instruments with the "-PN" suffix can generate both
polarities.
The fan-cooled output module contains a 50Ω series resistance, and packaged diodes
may be soldered to the output terminals of this module. The diode load is connected in
series with the internal resistance, so that the current through the diode is normally
given by:
I
DIODE
= (V
OUT
– V
DIODE
) / 50Ω
where V
DIODE
is the voltage drop across the diode.
For chip-level testing, the output module is not used. In this case, a user-supplied
resistance of 50 Ohms should be connected in series with the chip, near the chip, and
the voltage waveform from the mainframe should be connected to the resistor/diode
series combination using coaxial cabling and/or coaxial probes. The resistance must be
capable of dissipating up to 50 Watts of average power, if the AVO-6HF-B is to be used
over its full range of capabilities.
This instrument is intended for use in research, development, test and calibration
laboratories by qualified personnel.
5
Summary of Contents for AVO-6HF-B
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