Tektronix 4225-RPM User manual
Keithley Instruments
Model 4225-RPM
PA-1086 Rev. B March 2023
1
28775 Aurora Road
Cleveland, Ohio 44139
1-800-833-9200
tek.com/keithley
Remote Pulse Module Instructions
Overview
The Keithley Instruments Model 4225-RPM Remote Preamplifier/Switch Module (RPM) is a remote amplifier
and automatic switch. It is a multiplexer switch that automatically switches between precision dc
source-measure units (SMUs), C-V, and the ultra-fast pulsed I-V ins tru ments .
The RPM also extends the low current measurement capability of the 4225-PMU Ultra-Fast Pulsed I-V
Instrument Module. This is especially important for devices like diodes or transistors that have I-V curves that
extend over several decades of current. The autorange feature of the 4225-RPM enables automatic range
selection while a pulsed I-V sweep is in progress. This feature provides optimal current measurement while the
device signal transitions through different current levels. The RPM adds the following current ranges to the
4225-PMU: 100 nA, 1 μA, 10 μA, 100 μA, 1 mA, and 10 mA.
Figure 1: 4225-RPM
*PPA-1086B*
Model 4225-RPM Remote Pulse Module Instructions
1
RPM interconnect cable, 2.4 m (8 ft)
CA-547-2.4
1 2 Triaxial to BNC adapter (guard removed)
CS-712
1 3 BNC-SMA female adapter
CS-1247
1 4 SMA to SMA cable, 20 cm (8 in.)
CA-452
1 5 Protective cap
CAP-47
2 6 Triaxial caps (for shielding, not shorting)
CA-31
4
Not shown
Support bracket
4200-322
1
Not shown
Captive panel screw (for support bracket)
FA-243-2
1
Not shown
Allen socket head capscrew, #4-40 x 5/16"
4-40x5/16SOHBLK
1
Not shown
Hex wrench, 3/32 in.
TL-32
1
Included accessor ies
The following cables, adapters, and accessories are included in the remote pulse module kit.
Figure 2: 4225-RPM included accessories
Item Description Keithley part number Quantity
Available cabl e kits
Model 4210-MMPC High Performance Triaxial Cable Kits (ordered separately) simplify RPM connections to a
prober, simplifying switching between dc I-V, C-V, and pulsed I-V testing configurations. These optional kits are
customized for specific probers. One kit is required for each pin of the device under test (DUT).
For additional information, refer to the 4200A-SCS Parameter Analyzer Datasheet, available from
tek.com/keithley
.
2 PA-1086 Rev. B March 2023
Model 4225-RPM Remote Pulse Module Instructions
Indicators
When the RPM is operational in a 4200A-SCS system, an LED on top of the RPM illuminates. The color of the
LED indicates which instrument is connected to the DUT during a test. Use the color codes in the following
figure to determine which instrument is connected. Note that the instrument indicator does not show that a test
is running or that the output of an instrument is active. To determine if a test is running, check the status
in Clarius.
Figure 3: Instrument indicator
Switching and connections
The 4225-RPM allows for automatic switching between dc I-V, C-V, and pulsed I-V measurements when
executed in ITM tests. The following topics describe typical connections for these measurements.
When properly installed, you can perform different electrical measurements on the device without having to
disconnect and reconnect cabling for each test. Optional multi-measurement performance cable kits
(Model 4210-MMPC) are available to connect the 4200A-SCS to a prober manipulator. In addition to eliminating
the need for recabling, these kits help maximize signal fidelity by eliminating the measurement errors that often
result from cabling errors.
Connecting the RPM to the PMU
Turn off the system and disconnect the power cord before connecting or disconnecting the
RPM to or from the PMU. Failure to do so may result in RPM or PMU damage, possibly
voiding the warranty.
The RPM is matched to a PMU card and channel. Make sure to connect the RPM only to that PMU
card and channel. Labels on top of the RPM indicate the specific connection channel and PMU. For
example, "PMU1-2" indicates PMU1, channel 2.
PA-1086 Rev. B March 2023 3
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