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Keithley 238 1nA-1A High Current Source Measure Unit
The Keithley 236, 237, and 238 Source-Measure Units (SMU) are
fully programmable instruments, capable of sourcing and measuring voltage
or current simultaneously. These systems are really four instruments in
one: voltage source, current source, voltage measure, and current measure.
Keithley 238 Applications:
These instruments address a wide variety of
applications, including the characterization of semiconductor devices and
the measurement of leakage currents or insulation resistance. They are
particularly useful as source and measuring instruments in automated test
equipment (ATE).
Keithley 238 Specifications:
- SOURCE-MEASURE UNIT: Sources
voltage while measuring current, or sources current while measuring
voltage.
- FUNCTION: Can be used as DC
source or meter, sweep source, or full source-measure unit.
SOURCE-DELAY-MEASURE CYCLE:
Default Delay: Fixed delay for instrument
settling.
User Delay: Additional delay for device under test or system
capacitance.
- MEASURE:
Integration Time
Fast: 416 µs 4-digit resolution
Medium: 4 ms 5-digit resolution
Line Cycle: 16.67 ms (60 Hz) or 20.00 ms (50 Hz), 5-digit resolution
Elapsed Time: Measures
and stores time from sweep trigger to measurement complete for each step
of sweep.
- RANGING:
Source: Auto-ranging through keypad entry;
fixed range selection using rotary dial and SELECT
keys (DC function). Fully programmable in SWEEP function.
Measure: Auto or fixed
range. Fixed range selection made by choice of
COMPLIANCE value.
- FILTER: Takes n measurements,
calculates and outputs average (n = 2, 4, 8, 16, or
32, selectable).
- SUPPRESS: Subtracts displayed
measurement from subsequent readings.
- MENU: DC Measurement Delay, Default Delay
On/Off, Local/Remote Sense, 50/60Hz, IEEE Address,
Self Tests.
- DATA ENTRY: Numeric keypad or
detented rotary dial.
- TRIGGER:
Input and Output: Set for any phase of
SOURCE-DELAY-MEASURE sequence or trigger output at
end of sweep.
Origin: Internal,
External (including front panel MANUAL TRIGGER button),
IEEE-488 bus (TALK, GET, "X").
- MEMORY: Stores one full sweep
(up to 1000 points) of source, delay, and measure
values, elapsed times, and sweep parameters. Lithium battery backup.
- INTERLOCK: Use with test
fixture or external switch. Normally closed; open
puts instrument in standby.
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