Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley 6517 Keithley 6517B differences from 6517A

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                 KEITHLEY CONFIDENTIAL - PROPRIETARY



  Differences between the new 6517B and
             the 6517A version
The following document lists the known differences between the revised Model 6517B
and the previous 6517A. Although the goal was to make the 6517B as functionally
identical to the 6517A, there are some enhancements and changes that are documented so
that you can communicate specific changes to your customers.

Contents
   1. Enhancements over 6517A
   2. Hardware differences
   3. Functional differences
          3.1 Calibration
          3.2 Communication
          3.3 Measurements
          3.4 New features
   4. Specification changes from 6517A

1. Enhancements over 6517A
   6517B now includes a 50,000 point battery-backed reading buffer, no longer limited
   by the number of reading elements stored. 6517A capacity was 15,706 readings and
   was limited by the number of elements stored in the buffer.
   Faster reading rates to the internal buffer (~425rdgs/sec) and to the IEEE bus
   (400rdgs/sec).
   Up to 5x faster settling time when measuring low currents.
   6517B now uses flash upgradeable firmware.
   6517B now supports up to 115200 baud. The 6517A only supported up to 19200
   baud.
   User selectable line power values of 100, 120, 220, 240VAC instead of the 6517A
   switch that selected either a range of 90-125VAC or 180-250VAC.


2. Hardware differences
   Preamp, analog output, and common jacks are no longer 5-way binding posts. These
   binding posts for the Electrometer Outputs have been replaced with safety jacks that
   meet current safety standards. The ground lug has also been replaced with a pluggable
   ground lead.


                                          1                               JLT 07/25/08
                KEITHLEY CONFIDENTIAL - PROPRIETARY

  The hardware interlock connector has been changed. The 6517B interlock connector
  has been changed to a 4-pin Phoenix Connector compared to the 4-pin DIN connector
  on the 6517A. The old connector has been obsoleted. To accommodate the new
  connector, two new accessories have been added:
         6517B-ILC-3: 4-pin Phoenix connector to 4-pin DIN Interlock Cable has been
         added to support use with the 8009A Resistivity Test Chamber.
         CS-1305: Interlock Connector
         The interlock is now a real hardware interlock for the operation of the High
         Voltage power supply. This is to bring the unit up to the latest safety
         standards. Note that because of this, the 6517B voltage source will not operate
         without the interlock whereas the 6517A voltage source would operate
         without an interlock connection.
  The Digital I/O connector has been changed to a DB9 male connection instead of the
  older mini DIN connector.
  External trigger signals are part of the digital I/O connector. Space limitations
  prohibited the BNC connectors. BNC connectors were redundant and market
  demands no longer required them.
  The main input jack on the rear panel was moved away from the rear panel plastic
  foot to improve customer accessibility and ease of use.
  The voltage source operate indicator is smaller (same design as 6221). For
  consistency with newer models, the 6517B indicator has been changed to Blue in
  color (No longer Red) and centered in the right side front panel.
  The line voltage selector is now hidden under the left front "foot bracket" that holds
  the handle onto the box. There was no room on the rear panel to place the switch. The
  switch allows the selection of 4 different input voltages: 100V / 120V / 220V / 240V,
  not just 2 as in the 6517A version. The line fuse remains changeable from the rear
  panel if the instrument.


3. Functional differences
3.1 Calibration
  Front panel calibration is no longer supported with the 6517B due to the complexities
  of the new calibration requirements. A customer front panel calibration would have
  been very tedious, time consuming, and would have been very easy to make mistakes
  due to the number of measurements that would have to be entered manually. The
  customer can still calibrate the unit over the GPIB bus. The 6517B calibration
  commands are provided in the service manual. Since the front panel calibration is no
  longer supported, the front panel calibration switch is no longer present. Calibration is
  now unlocked with a password.
  Voltage and current offset calibration is no longer needed outside of normal
  calibration. The 6517A required this, but was not implemented correctly. The 6517B
  has an improved voltage and current offset calibration, but requires additional


                                           2                                 JLT 07/25/08
                         KEITHLEY CONFIDENTIAL - PROPRIETARY

          equipment. Because of this requirement, the voltage and current offset calibration was
          removed from the front panel menus as it is no longer necessary for the user to
          perform this periodically.


        3.2 Communication
          The original 617 DDC emulation language is no longer supported.
          GPIB talk-only mode is no longer supported. This was a little-used feature from the
          6517A.
          RS-232 parity, data, and stop bit settings are now fixed at N,8,1. There is little need to
          use anything besides this setting, and the 6517B hardware would have difficulty
          supporting all the possible settings the 6517A had.


        3.3 Measurements
          The "Out-Of-Limit" message now applies whenever the input signal exceeds the
          maximum input range of the A/D, which is approximately 120% of range. The 6517A
          could show "Underflow" when measuring resistance in this condition, which is
          confusing. The 6517B manuals have been updated accordingly to include a better
          description of the Overflow/Out-Of-Limit indications.
          Readings can be displayed when ZeroCheck is turned on. This user selectable setting
          for this functionality is accessed by pressing CONFIG and Z-CHK.
          The Zero Check function (when turned on) now presents a 1 MegOhm load to the
          input terminal (referenced to input low). This was necessary for updated ESD and
          stability requirements.


        3.4 New features
          All non-volatile memory can be reset to defaults by the user for data security.




        Specification changes from 6517A
 Section          Spec             Description               6517A Spec                New 6517B Spec
                                                   NMRR: 60dB on 2V,             NMRR: 2V and 20V
                             Legacy spec problem. 20V, >55dB on 200V, at         range > 60dB, 200V
                             Need to add line sync 50Hz or 60Hz 

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