Avtech 14260, Instructions Manual

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INTRODUCTION
The AVR-EBF6-B is a high performance, GPIB/RS232/Ethernet-equipped test system
for measuring the t
FR
and V
FR
forward recovery characteristics of high speed rectifiers.
The AVR-EBF6-B consists of three main components:
1. The instrument mainframe, which generates voltage pulses in the range of +2.5V
to +50V with rise times < 5 ns.
2. A rise time filter, which increases the rise time of the voltage pulse to 10 ns (or
optionally 8 ns, 12 ns, or 20 ns), ±20%.
3. A test jig, into which the device under test (DUT) is inserted.
Depending on the options and accessories ordered, the instrument may be supplied
with more than one rise time filter and more than one test jig.
The mainframe connects to the rise time filter using a length of coaxial cable. The
output of the filter connects to the test jig using another length of coaxial cable. A
control cable connects the mainframe to the test jig, to control the safety interlocks. The
two test jig outputs are fed into the 50 Ohm inputs of an oscilloscope by two lengths of
coaxial cable.
The (user-supplied) oscilloscope is used to measure the V
FR
and t
FR
values based on
the waveforms from the test jig outputs.
The waveforms generated by this instrument are suitable for MIL-STD-750E Method
4026.3 tests. In the terminology of this standard:
●
I
F
= 50 mA up to 1 A
●
Rise Time = 10 ns (unless the optional 8, 12, or 20 ns filters are used)
●
Pulse width t1 = 200 ns to 10 us
●
Generator Resistance R
S
= 50 Ohms
●
Pulse frequency = 1 Hz to 10 kHz
●
Response detector input impedance Z = 500 Ohms
The test jig supplied with the instrument is carefully constructed such that the parasitic
inductance is minimized. This prevents overestimation of V
FR
, and provides increased
t
FR
accuracy.
Standard AVR-EBF6-B models include one AVX-TFR-MIX diode test jig. This standard
test jig contains a variety of pin sockets and posts, which may be used to hold the diode
device under test (DUT). The test jig has a hinged lid, which must be fully closed to
protect the user from high voltages. The output will be automatically disabled if the lid is
left open. The standard AVR-TFR-MIX test jig will accommodate TO-220AC (2 lead)
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