Keithley 3750 Connection Instruction
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Keithley 3750 Connection Instruction

Keithley 3750 Connection Instruction

Multifunction i/o card
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Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
1-888-KEITHLEY
www.keithley.com
Introduction
This instruction sheet contains information about the Keithley Instruments Model Series 3700 Multifunction I/O Card
connector pins, safety precautions, and product specifications.
WARNING
The following information is intended for qualified service personnel. Do not make module
connections unless qualified to do so.
To prevent electric shock that could result in serious injury or death, adhere to the following
safety precautions:
Before removing or installing a switch module in the mainframe, make sure the mainframe is
turned off and disconnected from line power.
Before making or breaking connections, make sure the power is removed from all external
circuitry.
Do not connect signals that may exceed the maximum specifications of the model or
external wiring. Specifications for each circuit board are provided in the Series 3700 User's
Manual.
WARNING
All wiring must be rated for the maximum voltage in the system. For example, if 300V is
applied to the backplane connector, all module wiring must be rated for 300V.
Information related to reading, writing, and controlling channels, as well as scanning, can be found in the Series
3700 System Switch/Multimeter User's Manual. Detailed information about controlling the Series 3700 from a
remote interface can be found in the Series 3700 System Switch/Multimeter Reference Manual.
PA-981 Rev. A / July 2008
www.valuetronics.com
Model 3750 Multifunction I/O Card
Connection Instructions and Specifications
1

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Summary of Contents for Keithley 3750

  • Page 1 Cleveland, Ohio 44139 1-888-KEITHLEY www.keithley.com Introduction This instruction sheet contains information about the Keithley Instruments Model Series 3700 Multifunction I/O Card connector pins, safety precautions, and product specifications. WARNING The following information is intended for qualified service personnel. Do not make module connections unless qualified to do so.
  • Page 2 Each bank can be configured as either inputs or outputs. One bank of I/O is equivalent to one system channel. The two analog outputs of the Model 3750 can be individually configured as either voltage outputs (+/- 12 V) or as current outputs (0 mA to 20 mA or 4 mA to 20 mA).
  • Page 3 Model 3750 Multifunction I/O Card Connection information: Model 3750 Figure 2: Model 3750 connection information PA-981 Rev. A / July 2008 www.valuetronics.com...

  • Page 4: Specifications

    Model 3750 Multifunction I/O Card Specifications GENERAL Channels 1 - 5: Bidirectional, high current digital I/O (40 bits) Channels 6 - 9: 32-bit counter (4 counters) Channels 10 - 11: Isolated voltage and current analog outputs (2 each) DIGITAL I/O Configuration: 40 bidirectional digital I/O bits arranged in 5 banks of 8 bits each.
  • Page 5 Model 3750 Multifunction I/O Card Maximum externally supplied voltage to any digital I/O line: Pull-up voltage (5V internal or up to 30V external) Digital Output specifications: Each output has an internal fly-back diode for driving inductive loads. Each output is protected against continuous short circuits and over temperature.

  • Page 6: Analog Voltage Output

    Programming up to 1% over full scale range is supported Measured with standard load shown in Figure 1 Measured with > 10MΩ input DMM (DCV, filter, 1 PLC rate). Warm-up time is 1 hour @ 10mA load with 3750-ST PA-981 Rev. A / July 2008...

  • Page 7: Analog Current Output

    Digital Outputs each channel (1 through 5): 325 mW Analog Channel each (10 & 11): 820 mW Measured with < 2Ω shunt DMM (DCI, filter, 1 PLC rate). Warm-up time is 1 hour with 3750-ST PA-981 Rev. A / July 2008...

  • Page 8: Accessories Available

    Model 3750 Multifunction I/O Card Totalizer Channel all (6 through 9): 730 mW Analog channels and counter channels may optionally be turned off to conserve system power. See Chapter 8 of the series 3700 user’s manual for more detailed information.

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