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SECTION I
Model 4145A
Table
l-l.
Snwifications
(Sheet
4
of 8)
SPECIFICATIONS
COMMON
TO ALL
CHANNELS
Maximum
Withstand
Voltage : 1OOV (SMU, guard terminal,
Vs, and Vm)
Maximum
Voltage Between
Common
and GND : Less than +42V.
Source Modes (SMUs Only) :
V (voltage source/current
monitor),
I (current
source/voltage
monitor),
and COM*.
Source Functions
(SMUs Only) :
VAR 1, staircase
sweep;
VARl', synchronous
(VARl) staircase
sweep;
VARZ, subordinate
(VARl) staircase
sweep;
CONST, constant
source (voltage
or current).
* : In COM mode, output
voltage
is OV and compliance
is 105mA.
Voltage/Current
Sweep
:
Output
from
each
SMU (voltage
or current)
and each
Vs
(voltage)
can be swept by assigning source function
VARl,
VARl',
or VARZ.
Max.
Number
of
Steps
:
512
in single-sweep
measurements,
up to
575
in
multi-sweep
measurements.
VARl : Main sweep.
Linear or logarithmic
sweep is selectable.
Linear
Sweep
:
Staircase
sweep
in
accordance
with
the
user
specified
START, STOP, and STEP values.
Log
Sweep
:
Staircase
sweep
in accordance
with
the
user specified
START
and STOP values-and
selected
LOG step (10, 25, or 50 points per decade).
VAR2
:
Subordinate
linear
staircase
sweep
in
accordance
with
the
user
speci-
fied
START,
STEP, an NO. OF STEPS values.
VAR2 source
channel
output
is
incremeneted
one STEP each time the VARl source channel completes
one sweep.
VARl'
: Staircase
sweep
synchronized
with
the
VARl
sweep.
Sweep
is made
with
a user specified,
fixed ratio or offset
value.
VARl' output
is calculated
as :
VARl' = a x VARl
(fixed ratio)
VARl' = b + VARl (fixed offset)
where
"al* is the
user-specified
ratio
(from
20.01
to
+lO)
and
'lb" is the
user-specified
offset
value.
Ratio
and offset
must be such that
the VARl'
source
channel does not exceed its maximum
output
limit.
HOLD
TIME
:
0 to
650 seconds,
1Oms resolution
(max.).
Accuracy
is _+0.5%+9ms.
DELAY
TIME
:
0 to
6.5
seconds,
lms
resolution.
Accuracy
is +O.l%+5xN
for
GRAPHICS
and SCHMOO
plots and +O.l%+lOxN
for LIST and MATRIX
displays.
Where N is the number of measurement
channels used in the measurement.
Output
Sequence
:
The order
in which
the
source
channels
begin
output
is fully
programmable.
Measurement
Modes : SINGLE,
REPEAT, APPEND
Integration
Time
(at each measurement
point)
: SHORT,
3.6ms;
MED,
20ms at 50Hz
line frequency,
16.7ms at 60Hz line frequency;
LONG,
16 times MED.
l-8
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