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Keithley 7701 User Manual

Summary of 7701

  • 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 test equipment depot - 800.517.8431 - 99 washington stre...

  • Page 2: Safety Precautions

    Safety precautions the following safety precautions should be observed before using this product and any associated instrumentation. Although some in- struments and accessories would normally be used with non-haz- ardous voltages, there are situations where hazardous conditions may be present. This ...

  • Page 3

    If a screw is present, connect it to safety earth ground using the wire recommended in the user documentation. The symbol on an instrument indicates that the user should re- fer to the operating instructions located in the manual. The symbol on an instrument shows that it can source or mea- sure 100...

  • Page 4: Model 7701

    Pa-769 rev. B / 8-03 model 7701 user’s guide keithley instruments, inc. 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 2 . • connections and wiring on page 4...

  • Page 5: Introduction

    2 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: • voltage measurements (dc a...

  • Page 6

    3 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 ...

  • Page 7: Connections and Wiring

    4 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. ...

  • Page 8

    5 figure 2 model 7701 screw terminals dmm hi mux 1 hi dmm shi mux 2 hi dmm slo mux 2 lo dmm lo mux 1 lo p12 p 1 3 p24 p25 dmm hi mux 1 hi dmm shi mux 2 hi dmm slo mux 2 lo dmm lo mux 1 lo p 1 2 p13 p24 p25 user-configurable screw terminals screw terminals to connect 7701 channels to dmm test equipme...

  • Page 9

    6 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. Install the four supplied #22 awg jumpers in the sc...

  • Page 10

    7 wiring note the model 7701 is shipped with plastic connector covers installed on the d-shell connectors. Each cover is secured to the connector by two screws. After removing a connector cover, retain it and the screws for future use. Any unused d-shell connector must have the connector cover insta...

  • Page 11

    8 idc ribbon cable connections connect an appropriate length of 50-conductor idc ribbon cable to a 50-pin male d-shell idc connector, and connect an appropriate length of 25-conductor idc ribbon cable to a 25-pin male d-shell idc connector. Table 2 and figure 5 provides terminal identification for t...

  • Page 12

    9 figure 5 50-conductor ribbon cable terminal identification 26 blue 27 violet 28 grey 29 white hi ch 15 lo 30 black hi ch 14 lo 31 brown 32 red 33 orange 34 yellow hi ch 17 lo 35 green hi ch 18 lo 36 blue 37 violet 38 grey 39 white hi ch 20 lo 40 black 41 brown hi ch 21 lo 42 red 43 orange 44 yello...

  • Page 13

    10 figure 6 25-conductor ribbon cable terminal identification 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 # 1 brown ch 25 hi 1 14 yellow ch 3...

  • Page 14

    11 figure 7 connecting ribbon cable assembly solder cup cable connections make all connections to d-shell male solder cup connectors using the correct wire size up to 20 awg. Terminal identification for the 50-pin d-shell connector is provided in table 1 and table 2 . Terminal identification for the...

  • Page 15

    12 typical connections the following examples show typical wiring connections for the following types of measurements: • Ω 2-wire and thermistor connections, figure 9 . • Ω 4-wire and rtd connections, figure 10 . • voltage connections (ac or dc), figure 11 . Figure 9 Ω 2-wire and thermistor connecti...

  • Page 16

    13 figure 11 voltage connections (dc or ac) column 1 hi lo column 32 hi lo (columns 2 31) + + dc voltage ac voltage test equipment depot - 800.517.8431 - 99 washington street melrose, ma 02176 - testequipmentdepot.Com.

  • Page 17: Operation

    14 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. Operation detailed information to close and open switching module channels are provided in section 2 of the model 2700 or 2750 user’s ma...

  • Page 18

    15 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 fol...

  • Page 19

    16 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 ...

  • Page 20

    17 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. Such a...

  • Page 21

    18 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). • channel 35 is ...

  • Page 22

    19 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 Ω 4 function. Front panel operation: press Ω...

  • Page 23

    20 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 ...

  • Page 24

    21 figure 14 multiple module test system (common-side ohms) ch 1 dut1 dut16 dut17 dut32 p25 p24 p13 p12 ch 1 dut33 dut48 dut49 dut64 p25 p24 p13 p12 hi lo ch 16 hi lo (ch 2–15) ch 17 ch 32 (ch 18–31) ch 33 (open) ch 35 ch 34 hi lo hi lo sense lo input lo sense hi input hi common-side bus hi lo sense...

  • Page 25

    22 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 demon...

  • Page 26

    23 figure 15 biasing and measuring dut test system (multiple channel operation) multiplexer 1 multiplexer 2 dut ch 1 dut dmm external source external jumper (1 of 4) multiple channel operation: open all channels close channel 133 close channel 135 close channel 101 close channel 111 installation of ...

  • Page 27

    24 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 > display al...

  • Page 28: Service

    25 service service for the model 7701 includes a procedure to verify performance, and provides replaceable parts information. Warning all service information is intended only for qualified service personnel. Do not attempt to service the model 7701 unless you are qualified to do so. Performance veri...

  • Page 29

    26 table 5 model 7701 parts list circuit designation description keithley part no. C1, c3, c4, c9, c10, c11, c14 cap, .1uf, 20%, 50v, ceramic (1206) c-418-.1 c2, c6, c17, c18, c19, c20, c23, c24, c25 cap, 47pf, 5%, 100v, ceramic (0805) c-465-47p c5, c98, c99 cap, 4.7uf, 10%, 35v, tantalum c-476-4.7 ...

  • Page 30

    27 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 po-13-1 d-sub cable kit 7709-306a dual conn cover 7709-312a final inspection 7701-fin-51 hole size 7701-102...

  • Page 31

    28 figure 16 model 7701 component layout (side-06) + + + u24 q5 c16 m 5 c5 j1015 r20 u25 u3 u14 u2 u16 q40 cr31 cr46 te3 cr45 + u6 u1 r7 r8 r9 r10 r12 r13 q42q28 q30 q48 q44 q38 q36 q34 q32 q28 q46 cr104 cr103 cr101 cr11 cr102 q43 q45 q47 q37 q35 q33 q31 q25 q29 q27 q41 q39 cr54cr53 cr52cr51 cr50cr4...

  • Page 32

    29 figure 17 model 7701 component layout (side-01) m 3 m6 m2 + + ++ ++ ++ ++ ++ ++ ++ ++ ++ ++ ++ + + ++ ++ ++ secondary side components (side - 01) note: for component information, see 7701 product structure. + + + r16 r18 r55 r14 r19 r1 1 r17 r1 12 r109 c20 c9 r108 c10 c1 1 c17 c25 c14 r2 r4 c2 c3...

  • Page 33: Drn.

    Keithley instruments, inc. Cleveland, ohio 44139 drn. Ckd. App. Date date date part number ltr revisions app. Date form 28777a-sbg bruning 40-21 62198-sbg purchased item specifications spec-7701 4/30/01 rev. B general 32 channels: 32 channels of 2-pole relay input. All channels configur- able to 4-p...

  • 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-...