Keithley 7701-OB User Manual
  1. Manuals
  2. Brands
  3. Keithley Manuals
  4. Multiplexer
  5. 7701-OB
  6. User manual
Keithley 7701-OB User Manual

Keithley 7701-OB User Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
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

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 7701-OB and is the answer not in the manual?

Questions and answers

Related Manuals for Keithley 7701-OB

Summary of Contents for Keithley 7701-OB

  • Page 1 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...

  • 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. 28775 Aurora Road User’s Guide 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

    Introduction NOTE The 7701 module can be used with Keithley Models 2700, 2701, and 2750. All references to the Model 27xx apply to the Models 2700, 2701, and 2750. The Model 7701 is a 32-channel high speed differential multiplexer module and has the following features: •...
  • 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

    Dual independent multiplexers WARNING Multiple channel operation should only be performed by experienced test engineers who recognize the dangers associated with multiple channel closures. Multiple channel operation ( ROUT:MULT:CLOS command) allows individual control of switching module channels. Multiple channel operation allows the switching module to be configured as two independent multiplexers. The Model 7701 is normally used as a single 1 ×...
  • 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 MUX 2 HI DMM SHI DMM SLO...
  • 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. 2.
  • Page 10 Table 1 D-shell pin identification 50-pin D-shell (DB-50) 7701 7701 7701 7701 7701 Terminal Terminal Terminal Terminal Terminal Ch 1 Hi Ch 16 Hi Ch 6 Lo Ch 21 Lo Ch 12 Hi Ch 2 Lo Ch 17 Lo Ch 8 Hi Ch 23 Hi Ch 13 Lo Ch 4 Hi...
  • Page 11 Ch 11 Lo Violet Ch 24 Hi Orange Ch 12 Hi Grey Ch 24 Lo Yellow Ch 12 Lo White Mux 1 Hi Green Ch 13 Hi Black Mux 1 Lo *50-conductor IDC ribbon cable is available from Keithley, Part #15020.
  • 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 Ch 30 Hi 6 Yellow Ch 30 Lo 19 Green Orange Ch 31 Hi 7 *25-conductor IDC ribbon cable is available from Keithley, Part #15025. Figure 6 25-conductor ribbon cable terminal identification 25-Pin D-Shell IDC Ribbon Cable — 25-Conductor Male IDC...
  • 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...

  • 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 Channel MUX 1 MUX 2...

  • Page 18: Channel Assignments

    Channel assignments The Model 2700 has two slots for switching modules and the Model 2750 has five slots. To control the appropriate switching module, the slot number must be included with the switching module channel number when you specify a channel. The chan- nel assignment is formatted as follows: where: S is the slot number CH is the channel number...

  • Page 19: Multiple Channel Operation

    Amps measurements The 7701 module does not support amps measurements. System channel operation cannot be used to close channels while an amps function (DCI or ICI) is selected. If an amps function (DCI or ACI) is selected and you attempt to close a system channel, the message “NO AMPS CHAN” will be displayed briefly.
  • 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 With the 4-wire common-side ohms mode selected, channels 33 and 35 are automatically controlled as follows when a system input channel (1 through 32) is closed. • Channel 33 is forced open to connect Multiplexer 1 (channels 1 through 16) to Multiplexer 2 (channels 17 through 32).
  • 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. Press Ω...
  • Page 23 Multiple module system Figure 12 shows a one-card test system to perform common-side ohms measurements on up to 32 DUT. The test system can be expanded to test more 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. •...
  • 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 35 Ch 16 Input LO Ch 33 (Open) Sense...
  • Page 25 Biasing and measuring DUT (dual multiplexing) WARNING Multiple channel operation is required for the following application. Multiple channel operation should only be performed by experienced test engineers who recognize the dangers associated with multiple channel closures. 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.
  • 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) Sense Ch 17 Ch 34 (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. Front panel operation: Press OPEN >...

  • Page 28: Performance Verification

    Table Ordering information To place an order, or to obtain information concerning replacement parts, contact your Keithley representative or the factory (see back cover for addresses). When ordering parts, be sure to include the following information: • Card model number (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)
  • Page 32 Figure 17 Model 7701 component layout (Side-01)
  • Page 33 7701 150V 32-Channel Differential Multiplexer GENERAL 32 CHANNELS: 32 channels of 2-pole relay input. All channels configur- External Wiring Access able to 4-pole. RELAY TYPE: Latching electromechanical. ACTUATION TIME: <3ms. Multiplexer 1 FIRMWARE: Specified for Model 2700 rev. B03 and Model 2750 rev. A01. User Configurable DMM CONNECTIONS: Screw terminals provide internal DMM connec-...
  • 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) •...

This manual is also suitable for:

7701

Table of Contents