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SECTION
m
Model 4277A
3-108. OPTIONS
3-109.
Options are standard modificaions to the
instrument
that
implement
user's
special
requirements
for
minor
functional
changes.
Operating instructions for the 4277A's options
(except rack mount and handle installation kit
options)
and
associated
information
are
described in the following paragraphs.
3-110. Two options are available, as listed in
the following tables:
Option No.
Option Name
001
Internal DC Bias
002
Comparator/Handler
Interface
Option contents are as follows:
Option No.
Contents
001
A22 Internal DC Bias
Board Assembly
002
Comparator/Handler
Interface Kit
Table 3-18. Bias Voltage Resolution
Bias Voltage Range
Resolution
OV to ±9.99V
lOmV
±10.OV to ±40.OV
iOOmV
Note
For the option 001 operation, set the
DC
BIAS
select
switch
on
the
rear-panel to INT.
3-111.
OPTION 001 INTERNAL DC BIAS (-40V
to +40V)
3-112. Option 001
adds an internal dc bias
supply variable from .00 volts to ±40.0 volts.
The do bias voltage can be controlled manually
from the front-panel or remotely via the HP-IB.
Manual control and dc bias applications under
HP-IB control are described in Figure 3-31. The
internal dc bias source has two ranges and a
maximum resolution of lOmV.
Refer to Table
3-18.
Output
from
the
bias
source
is
automatically
set
to
OV
each
time
the
instrument is turned on or when the CLEAR
command is sent via the HP-IB. DC bias voltage
is applied to the DUT only when the DC BIAS
select switch on the rear panel is set to INT and
the DC BIAS ON/OFF switch on the front panel
is set to ON. If the DC BIAS ON/OFF switch is
set to OFF, OFF will be briefly displayed on the
FREQUENCY/DC BIAS display each time a new
bias voltage is set. The dc bias voltage actually
applied to the DUT depends on the impedance of
the DUT and in most cases will be less than the
voltage value displayed on the FREQUENCY/DC
BIAS display.
By connecting a
DVM or an
oscilloscope to the EXT INPUT/INT MONITOR
connector on the rear panel, the dc bias voltage
actually
applied
across
the
DUT
can
be
monitored. Refer to Figure 3-32.
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