Modifying Keithley Interlock Cable 236-ILC-3 for Use w/Cascade 12000 Series Semiautomatic Probers

Modifying Keithley Interlock Cable 236-ILC-3 for Use w/Cascade 12000 Series Semiautomatic Probers
technical note
A
G R E A T E R
M E A S U R E
O F
C O N F I D E N C E
Modifying Keithley Interlock
Cable Model 236-ILC-3 for Use
with Cascade 12000 Series
Semiautomatic Probers
1. Disassemble one end of the 236-ILC-3 interlock cable by untwisting the back
part of the connector.
2.Note (or label) the lead designation before disconnecting the leads. Leads
­corresponding to pins 1 and 2 are connected, while pin 3 is not used. Note
also that neither pin 1 nor pin 2 is connected to the ground (shield) of the
­connector.
3. Disconnect the leads from the connector by cutting or unsoldering. Prepare the
freed ends by stripping the insulation about one-half inch.
4. Obtain a coax-to-coax cable. Cut the cable at any point, depending on the
length desired, but no shorter than three inches from the coaxial connector.
5. Strip the end of the cable and prepare the ends for soldering, as shown in
Figure 1.
6.Connect and solder the interlock cable and the coaxial cable as shown in
Figure 2. Maintaining correct pin designation on the interlock cable is crucial
(see Step 2). If lead designation is lost, it can be restored by testing lead-to-pin
correlation using an ohmmeter.
7. Insulate each lead using appropriate size shrink tubing or electrical tape or
both. After each lead is individually insulated, add some strain relief to the
connection by wrapping the cable with electrical tape or using oversize shrink
tubing.
8.Test the cable to make sure that connections correspond to Figure 2, and that
NO PIN of the interlock cable is conducting to the ground (metal body of the
Keithley 3-pin interlock connector). Interlock leads carry +12V DC from the
4200-SCS power supply, and a short to ground will damage the instrument.
Also, refer to Figure 3 (taken from Figure 4-14 in the 4200-SCS Semiconductor Characterization System Reference Manual). Note that both the shield and
core of the coax connector on the Cascade 12000 Prober are insulated from the
ground.
Figure 1
1
technical note
Modifying Keithley Interlock Cable Model 236-ILC-3 for
Use with Cascade 12000 Series Semiautomatic Probers
Coaxial
Connector
Interlock
Connector
Figure 2
Test Fixture/
Probe Station
Interlock
Switch
Interlock
Connector
Pin 1 = Interlock
1
Pin 2 = +12V
Pin 3 = No Connection
SMU1
SMU2
SMU8
3
2
Self Resetting
Fuse (1 amp)
±240V
Power Supply
±40V +12V +5V
Safety
Relay
Power Supply
Interlock Front
Panel Indicator
(On When Asserted)
Model 4200-SCS
Figure 3
Specifications are subject to change without notice.
All Keithley trademarks and trade names are the property of Keithley Instruments, Inc.
All other trademarks and trade names are the property of their respective companies.
Keithley Instruments, Inc. 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168
1-888-KEITHLEY (534-8453) • www.keithley.com
© Copyright 2009 Keithley Instruments, Inc.
Printed in the U.S.A.
No. 2529
0309
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