Solartron 1260 - Page 71

[GENERATOR
Cont]
Type of drive and
constant
current
drive
parameters.
TYPE
Selects
constant voltage
or
constant current drive.
Duplicate
of TYPE
in
Section
1.1 above.
FREQ
Frequency
of generator
output. Duplicate
of FREQ
in Section
1.1 above.
LAMPL
Constant
current
ac
amplitude, in
the range
OmA
to 60mA
rms
10MHz) and OmA
to
20mA rms
(f>
10MHz).
I.
BIAS Constant
voltage dc
level,
in the range
-100mA
to + 100mA.
Used
for
setting
the quiescent
operating
point of
the IUT
or
for
nulling
a dc ofTset.
[MONITOR]
Constant input signal
parameters.
ENABLE Selects
a constant signal
level
at the analyzer
VOLTAGE 1 or
CURRENT
input.
(In monitor
mode the
displayed
amplitude
variable
represents
the
actual
generator
output.)
* [monitor
off]
Monitor
facility off:
generator
output
held
at
V
AMPL or 1 AMPL
value, in
accordance with TYPE
setting.
(See Sections 1.1
and 1.2 above.)
• [monitor V
1,
target^
V. AMPLj
Constant voltage
input.
Generator output
is adjusted
automatically
to
hold the
analyzer
VOLTAGE
1 input
at
V
AMPL
±ERROR%
During
this
process the
generator
output
is not allowed
to exceed
the V LIMIT
value.
• [monitor I,
target^
I. AMPL]
Constant
current input.
Generator
output is adjusted
automatically
to
hold
the analyzer
CURRENT
input
at I AMPL ±
ERRORS.
During
this
process
the generator
output is not allowed
to exceed
the I LIMIT
value.
V.
LIMIT Maximum
amplitude
voltage allowed
at
generator output
in [monitor
VI,
target
=
V. AMPL]
mode.
(Default
value
=
3V.)
L LIMIT
Maximum
amplitude
current
allowed
at generator
output in
[monitor
I,
target
=
I.
AMPL)
mode.
(Default
value
=
60mA.)
ERROR%
Percentage
difference
(1%
to 50%)
allowed
between the
generator
output
and
the target value, in
monitor
mode.
A failure
to obtain
a target
value within
the defined
error
percentage
(after two
attempts)
results
in
the error
message
"84.
MONITOR
FAILED”.
MONITOR CONFIGURATIONS
To
hold an input
signal
at a
constant
level
the
instrument
uses one
of the
feedback
configurations
schematized
in Fig
5.2.
These
configurations
are
part
hardware
and
part software
and, excluding
the IUT,
are
contained
in the
instrument.
In
each
case
the generator
output is
varied,
within
defined
limits,
to maintain
the
selected input
at
a defined
level. An amplitude sweep
with
monitor
enabled
sweeps
the
selected
input.
5.4
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