User manual

7
Sampling (Time Domain)
Measurement Characteristics
Displays the time sampled voltage/current
data versus time.
Max. sampling points: 10,001 (linear)
Sampling mode: linear, log, and thinned-out
Note: The thinned-out mode is similar to reverse-log
sampling. Sampling measurement continues by thin-
ning out older data until the sampling completion
condition is satisfi ed.
Sampling interval range and resolution:
Linear scale (auto mode):
60 μs to 480 μs range:
20 μs resolution
480 μs to 1 s range:
80 μs resolution
1 s to 65.535 s range:
2 ms resolution
Linear scale (no limit mode), log scale, and
thinned-out modes:
560 μs (720 μs at thinned-out mode)
to 1 s range: 80 μs resolution
1 s to 65.535 s range:
2 ms resolution
Note: The following conditions must be set when initial
interval is less than 2 ms.
• Number of measurement channels: 1
• Measurement ranging: fi xed range
• Stop condition: disable
Hold time:
Initial wait time: 0.03 s to 655.35 s,
100 μs resolution
Sampling measurement stop condition: A
condition to stop the sampling can be
defi ned.
Sampling interval setting accuracy
(supplemental data):
0.5% + 10 μs (sampling interval
≤480 μs)
0.5% + 10 μs (480 μs ≤sampling
interval <2 ms)
0.5% + 100 μs (2 ms ≤sampling
interval)
C-V Measurement Characteristics
Capacitance is a calculated value
derived from the following equation:
DQ
C = ———
DV
DQ is the change in charge when DV, the
step voltage, is applied by the SMU; DQ
is derived from the measurement current
(amps) and the integration time (seconds).
Maximum Measurable Value
Maximum measurable value depends
on the current range, integration time, and
step voltage (refer to the chart in supple-
mental data).
Capacitance Calculation Accuracy
Accuracy is dependent on accuracy of
the current measurement and voltage
measurement and the stray capacitance
and leakage current of measurement path,
etc. (Refer to the chart in supplemental
data).
Zero Offset
Cancels stray capacitance of the fi xtures
and test leads.
Leakage Current Compensation
Cancels the infl uence of the leakage
current to the capacitance measurement.
Stress Force Characteristics
SMU, VSU, and PGU output can be forced
for the user specifi ed period.
Stress time set range: 500 μs to 31,536,000
s (365 days)
Resolution:
100 μs (500 μs ≤stress time ≤10 s)
10 ms (10 s <stress time ≤31,536,000 s)
Burst pulse count: 1–65,535 (PGU only)
Trigger: The 4155C and 4156C output a
gate trigger while stress channels are
forcing stress.
Knob Sweep
In knob sweep mode, sweep range is
controlled instantaneously with the
front-panel rotary knob. Only the Channel
Defi nition page need be defi ned.
Standby Mode
SMUs in “Standby” remain programmed to
their specifi ed output value even as other
units are reset for the next measurement.
Other Characteristics
Measurement Control: Single, append,
repeat, and stop
Stress Control: Stress force and stop
SMU Setting Capabilities: Limited
autoranging, voltage/current compli-
ance, power compliance, automatic
sweep abort functions, self-test, and
self-calibration.
Arithmetic and Analysis
Functions
Arithmetic Functions User Functions
Up to six USER FUNCTIONS can be defi ned
using arithmetic expressions.
Measured data and analyzed variables
from graphics analysis (marker, cursor, and
line data) can be used in the computation.
The results can be displayed on the LCD.
Arithmetic Operators
+, -, *, /, ^, LGT (logarithm, base 10),
LOG (logarithm, base e), EXP (exponent),
DELTA, DIFF (differential), INTEG (integra-
tion), MAVG (moving average), SQRT,
ABS (absolute value), MAX, MIN, AVG
(averaging), COND (conditional evaluation).
Physical Constants
Keyboard constants are stored in memory
as follows:
q: Electron Charge, 1.602177 E-19 C
k: Boltzman’s Constant,
1.380658 E-23
ε (e): Dielectric Constant of Vacuum,
8.854188 E-12
Engineering Units
The following unit symbols are also avail-
able on the keyboard: f (10
-15
),
p (10
-12
), n (10
-9
), u or µ (10
-6
),
m (10
-3
), K (10
3
), M (10
6
), G (10
9
)
Analysis Capabilities
Overlay Graph Comparison
A graphics plot can be stored and later
recalled as an overlay plane. Four overlay
planes can be stored. One plane can be
overlaid onto the current data.
Marker
Marker to min/max, interpolation, direct
marker, and marker slip
Cursor
Long and short, direct cursor.
Line
Two lines, normal mode, grad mode,
tangent mode, and regression mode.
Scaling
Auto scale and zoom.
Data Variable Display
Up to two user defi ned parameters can be
displayed on the graphics screen.
Read Out Function
The read out functions are built-in func-
tions for reading various values related to
the marker, cursor, or line.