Yokogawa Model 7501 Programmable Scanner (discontinued)

  • Switching for up to 50 channels
    The 7501 has five rear-panel slots for relay card insertion, enabling it to handle swithcing for up to 50 channels (with five cards installed). This makes it ideal for multi-point measurement systems, for everything from semiconductor and electrical/electronic parts testing to temperature distribution measurements. Also, digital I/O card can be inserted into the slots.
  • Relay card (4 types) and digital I/O card
    The 7501 can be fitted with 4 different types of relay card to enable it handle a wide range of applications: general-purpose multiplexer, thermocouple multiplexer, general-purpos actuator, and general-purpose matrix. These make it simple to make multi-point measurements of temperature, or of electrical quantities such as voltage and resistance. Linearity evaluation of A/D converter and D/A converter is possible using digital I/O cards, which can read/write digital signals. Moreover, by combining these cards you can also use a single 7501 like multiple scanner units.
  • Two SCAN model
    Either of two SCAN modes can be selected to meet the requirements of your application.

    • CHANNEL mode (CHAN)
      In CHANNEL mode, the each channels are scanned in succession from the first (starting) to the last (ending) channel. The scan first and last channels can be freely settable. During scanning in CHANNEL mode, each of the scanned switches turns ON one at a time.
    • PROGRAM mode (PRGM)
      In PROGRAM mode, scanning can be done in whatever sequence the user programs. During scanning in PROGRAM mode, and desired number of switches can be turned ON at the same time.
    • Convenient memory functions
    • Internal memory
      Programs up to 100 steps long, together with control parameters such as scan interval, number of times to repeatthe scan sequence, and so on can be stored. Since this memory is supported by battery backup, the memory contents are retained even with power OFF.
    • IC memory card
      If you use IC memory cards too, you can save the internal memory contents onto the cards -up to eight program & parameter sets per card (using a 64K bytes card)- and be able to call up different switching patterns quickly whenever you want them. Since these IC memory cards are the same as those used for YOKOGAWA intruments such as the 7560 Series DMM, the 7563 Digital Thermometer, and 7651 Programmable DC Source, you can even store data from other instruments on a single card.
    • System-friendly
    • GP-IB (standard)
      GPIB provides bi-directional communication capabilities for powerful support in systems applications. As a listener function, the 7501 allows external control of all its functions (except power ON/OFF), and as a talker function, outputs date and time, switch statuses and program and parameters to the outside.
    • Remote control
      For remote control, the 7501 supports two signals: a TRIG input (scan advances one to next channel or next step on each trigger), and CLOSED output (output as an external relay ON signal).
    • EXTEND
      The EXTEND function allows you to connect some 7501 scanners together. In this way, you can extend the number of channels up to 100 with two units, 200 with four units, and so on, so that even large-scale systems can be handled using the 7501.
    • Extensive set of user-definable control parameters
      The 7501 provides a full set of parameters that you can set up to control its operation. These include: first channel/last channel, first step/last step, step interval/scan interval, scan count N, and delay. By varying these parameters, you can define a wide range of switching patterns.
    • Numerous convenient functions
      Auto scan/single scan, skip function, pair function, direct access function, clock function.
Product Description:
The 7501 is an indispensable tool for the configuration of test and measurement systems that use a wide variety of instrumentation such as DMM’s, thermometers, voltage/current source, and other equipment. With its capacity of switches up to 50 input/output channels, plus the large number of functions to support their use, it can handle a wide range of applications that require multi-point measurement.
What’s more, with features like IC memory cards for saving the switching programs, and GP-IB as standard, the 7501 handles every scale of automated measurement system, from large to small.
Features :
  • Channel Scan function
    In channel mode, the user can specify the scan start channel number and the scan end channel number. When scanning starts, the scan proceeds automatically as the channel number starts, the scan proceeds automatically as the channel number increments. In this mode, only the one switch corresponding to the channel number closes.
  • Skip function
    If skip is set for a channel, that channel is skipped when the scan is executed. Skip can be specified not only for individual channel numbers, but also for a continuous series of channel numbers from a skip start to a skip end channel number, making it possible to skip an entire group of channels.
  • Step interval
    The interval between successive channel switching operations is specified by setting the step interval. This can be specified in ms, s, min, or hour units.
  • Scan interval/number of repetitions
    The cycle period with which a series of scanning operations is executed from the start channel through the end channel can be specified in ms, s, min, or hour units. The number of repetitions can also be specified from 1 to 99 times. If the number of repetitions is set to ‘0’, scanning repeats until stopped by pressing the STOP key.
  • Pair
    In CHANNEL mode, this function lets you scan any pair of the same type cards simultaneously. This makes it easy to carry multiple identical tests with high efficiency.
  • Programmed scan function
    (program mode: PRGM)
  • Program mode lets you define steps from 0 to 99, specifying which relays to open/close for each, after which running the program will execute those steps in sequence. Up to 50 open/close actions can be specified in each step. Moreover, since you can specify a scan start step and scan end step, the 100 steps can be divided among multiple programs. To select which to run, the user need only specify the start and end steps.
    Skip function
    Skip can be performed with step numbers assigned randomly, or by specifying skip start and end steps.
    Step interval
    The step interval can be used to specify the interval between step switches.
    Program mode (operating time: 20 ms; return time: 20 ms)
  • Scan interval/number of repetitions
    The cycle period with which a series of scanning operations is executed from the start channel through the end channel can be specified in ms, s, min, or hour units. The number of repetitions can also be specified from 1 to 99 times. If the number of repetitions is set to ‘0’, scanning repeats until stopped by pressing the STOP key.
  • Direct access
    Direct access lets you turn any channel ON or OFF directly, independent of the sequence operation. Since this can be achieved from either local or remote control, this is very convenient for purposes such as checking system operation.
  • IC memory card
    The channel mode and program mode setup parameters can be saved to an IC memory card and reloaded again whenever needed.
pdf_pic Downloads:General Specifications

GP-IB functions
(standard feature)Listener function
(receives the following commands from a controller)

  • Commands to perform any functions that can be executed by panel key operations (except “POWER” and “SRQ” keys)
  • Requests for output of panel setup information
  • Requests for output of program information
  • Requests for output of data read through digital I/O cards
  • Requests for output of devices status.

Talker function (ouptuts the following information)

  • Panel setupt information
  • Program information
  • Digital data read from digital I/O cards
  • Divices status

Remote control function / Extend functionThe following three remote signals can be input and output via the remote control signal connector on the scanner rear.

  • Ext-trigger (input, TTL level)
    Start signal for control from an external device. Operation starts on falling edge.
  • Closed (output, TTL level)
    Relay operation end signal. The delay from the time when the relays close until the CLOSED signal in output can be specified in ms or s units.
  • Extend start/extend end
    By specifying one unit as the master and others as slaves, a system can be extended to multiple 7501 Programmable Scanners
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