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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