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Keithley 7701 User Manual

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Model 7701
User's Guide
PA-769 Rev. B / 8-03
The Model 7701 can be used with Keithley
Models 2700, 2701, and 2750. All references
to the Model 27xx apply to the Models 2700,
2701, and 2750.
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
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

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   Summary of Contents for Keithley 7701

  • Page 1 Visit us at www.TestEquipmentDepot.com Model 7701 User’s Guide PA-769 Rev. B / 8-03 The Model 7701 can be used with Keithley Models 2700, 2701, and 2750. All references to the Model 27xx apply to the Models 2700, 2701, and 2750.
  • Page 2: Safety Precautions

    Keithley products are designed for use with electrical signals that The instrument and accessories must be used in accordance with its are rated Measurement Category I and Measurement Category II, as specifications and operating instructions or the safety of the equip-...
  • Page 3 Keithley Instru- symbol on an instrument indicates that the user should re- ments. Standard fuses, with applicable national safety approvals, fer to the operating instructions located in the manual.
  • Page 4 Model 7701 Keithley Instruments, Inc. User’s Guide 28775 Aurora Road Cleveland, Ohio 44139 (440) 248-0400 Fax: (440) 248-6168 www.keithley.com The information in this section is organized as follows: • Card configuration – schematic on page • Connections and wiring on page •...
  • Page 5: Card Configuration - Schematic

    Although the Model 7701 relays are the latching type (relays hold their state even after power has been removed), all relay states are set to open a few seconds after either a power cycle or an *RST command is issued.
  • Page 6 Figure 1 Simplified schematic for Model 7701 With a normal 4-wire function selected (i.e., Ω 4), system channels 1 through 16 can be closed. These 16 channels are paired to channels 17 through 32 (channel 1 paired to channel 17, channel 2 paired to channel 18, and so on). When one of these system channels is closed, its paired channel, and channels 33 and 34 also close to connect the DUT to the DMM.
  • Page 7: Dual Independent Multiplexers

    Figure 2, the Model 7701 is shipped with the jumpers not installed. With the jumpers not installed, all input to the Model 7701 is electrically isolated from the DMM. Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com...
  • Page 8 Figure 2 Model 7701 screw terminals Screw Terminals to Connect 7701 Channels to DMM DMM HI User-Configurable MUX 1 HI Screw Terminals MUX 2 HI DMM SHI DMM SLO MUX 2 LO MUX 1 LO DMM LO DMM HI MUX 1 HI...
  • Page 9 Connecting Model 7701 channels to DMM Perform the following steps to internally connect the channels of the Model 7701 to the DMM of the Model 27xx: 1. Remove the top cover of the Model 7701. It is secured to the module case by a single screw.
  • Page 10 Any unused D-shell connector must have the connector cover installed. The Model 7701 is supplied with one 50-pin male IDC ribbon cable connector, and one 25-pin male IDC ribbon cable connec- tor. These ribbon cable connectors mate to the D-shell connectors of the switching module.
  • Page 11 25-pin ribbon cable connections. The connectors of the prepared ribbon cable assemblies mate to the 50- and 25-pin D-shell connectors of the Model 7701 (Figure 7). Make sure an unused D-shell connector has the connector cover installed.
  • Page 12 Figure 5 50-conductor ribbon cable terminal identification 50-Pin D-Shell Male IDC IDC Ribbon Cable — 50-Conductor 1 Brown Ch 1 2 Red 3 Orange Ch 2 4 Yellow 5 Green Ch 3 6 Blue 7 Violet Ch 4 8 Grey 9 White Ch 5 10 Black...
  • Page 13 Table 3 Terminal identification for 25-conductor IDC ribbon cable and 7701 DB-25 connector Ribbon Cable*: 7701 DB-25 Ribbon Cable*: 7701 DB-25 Conductor Color Terminal Pin # Conductor Color Terminal Pin # Brown Ch 25 Hi 1 Yellow Ch 31 Lo 20...
  • Page 14 A connector cover must be installed on an unused D-shell connector. If the connector is left open, an electrical shock hazard may be present. Figure 8 Connecting solder cup cable assembly KEITHLEY CONNECTOR COVER Install plastic cover over unused connector using two #4-40 screws.
  • Page 15: Typical Connections

    Typical connections The following examples show typical wiring connections for the following types of measurements: • Ω 2-Wire and thermistor connections, Figure • Ω 4-Wire and RTD connections, Figure • Voltage connections (AC or DC), Figure Figure 9 Ω 2-Wire and thermistor connections Column 1 Resistors or (Columns 2 31)
  • Page 16 Figure 11 Voltage connections (DC or AC) DC Voltage AC Voltage Column 1 (Columns 2 31) Column 32 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com...
  • Page 17: Connection Log

    Connection log Make a copy of Table 4 and affix it to the cover of the Model 7701. Use this to record connection information and channel descriptions as needed. Table 4 Connection log Model 7701 Channel Color Description Description Color...
  • Page 18: Channel Assignments

    ROUT:OPEN:ALL Common-side (CSID) 4-wire ohms The Model 7701 can be configured to use a common bus to perform 4-wire ohms measurements on up to 32 DUT. Details of CSID operation is provided in the application for Common-side 4-wire ohms measurements on page...
  • Page 19: Multiple Channel Operation

    Making amps measurements – In order to perform amps measurements, you must use the front panel inputs of the 27xx mainframe. You can still use the 7701 module for other aspects of the test (such as controlling a bias supply for DUT), but you must use multiple channel operation to close channels.
  • Page 20 Applications Common-side 4-wire ohms measurements When using 4-wire ohms measurements and system channel operation, up to 16 DUT can be tested by the DMM. By using common-side (CSID) 4-wire ohms mode and the user configurable screw terminals, up to 32 DUT can be measured using 4-wire ohms.
  • Page 21 4. Select 4W MODE: NORM (normal) or CSID (common-side). NOTE Changing the 4-wire ohms mode opens all channels for all modules in the mainframe. For remote programming, the following commands are valid with a 7701 module installed: ‘ Select normal 4W mode. SYSTem:FRESistance:TYPEx, NORMal ‘...
  • Page 22 Test procedure: NOTE The following test procedure assumes a Model 7701 switching module installed in slot 1 of the mainframe. 1. Open all channels. Front panel operation: Press OPEN > Display ALL > Press OPEN Remote programming: ROUT:OPEN:ALL 2. Select Ω4 function.
  • Page 23 DUT by adding one or more modules: • Models 2700 and 2701 – Adding a second Model 7701 to the test system allows up to 64 DUT to be tested. • Model 2750 – Use up to five Model 7701s to test up to 160 DUT.
  • Page 24 Figure 14 Multiple module test system (common-side ohms) Keithley 27xx Mainframe Keithley 7701 Switching Module SLOT 1 Input HI Sense HI DUT1 Ch 1 (Ch 2–15) Input Sense LO DUT16 Ch 16 Ch 35 Input LO Ch 33 (Open) Sense...
  • Page 25 This application demonstrates how to use the Model 7701 as a dual multiplexer to bias and measure 16 DUT. An external source powers DUT, while the DMM of the Model 27xx measures the output of the DUT. To prevent overloading of the exter- nal source, each DUT is powered (and measured) separately.
  • Page 26 Figure 15 Biasing and measuring DUT test system (multiple channel operation) Multiplexer 1 Ch 1 Note: Installation of the four screw terminal jumpers is shown. (Channels 2–15) Ch 35 Ch 16 Input Jumper Ch 33 (1 of 4) (Closed) Ch 34 Sense Ch 17 (Channels 18–31)
  • Page 27 Test procedure: NOTE The following test procedure assumes a Model 7701 switching module installed in slot 1 of the mainframe. Multiple channel operation from the front panel is not available for early versions of the Model 2700. 1. Open all channels.
  • Page 28: Performance Verification

    Model 7701 unless you are qualified to do so. Performance verification Use the performance verification procedure for the Model 7701. This procedure is provided in PA-775 of this manual. Replaceable parts This section contains replacement parts information and the component layout drawing for the Model 7701.
  • Page 29 Table 5 Model 7701 parts list Keithley Part Circuit Designation Description C1, C3, C4, C9, C10, C11, C14 CAP, .1UF, 20%, 50V, CERAMIC (1206) C-418-.1 C2, C6, C17, C18, C19, C20, C23, C24, CAP, 47PF, 5%, 100V, CERAMIC (0805) C-465-47P C5, C98, C99 CAP, 4.7UF, 10%, 35V, TANTALUM...
  • Page 30 Table 5 (cont.) Model 7701 parts list Keithley Part Circuit Designation Description 4-40 X 1/4 LG. PHIL. FLAT HD. SCREW 4-40X1/4PFH FOR 7709-312A 4-40 X 1/4 PHILLIPS PAN HD. 4-40X1/4PPH 4-40 X 7/16 STANDOFF ST-166-18 BOTTOM CARD COVER 7703-301B CHIPLOC BAG STATIC SHIELDING...
  • Page 31 Figure 16 Model 7701 component layout (Side-06) Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com...
  • Page 32 Figure 17 Model 7701 component layout (Side-01) Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com...
  • Page 33 The Model 7701 is rated for low-voltage applications. Channel 32 When connecting the 7701 to the internal DMM via CONTACT RESISTANCE: <1Ω any path and additional 1Ω at end of con- the screw terminals, all other modules in the tact life.
  • Page 34 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com...
  • Page 35 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) •...

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