Keysight 34921A User Manual

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Keysight 34921A User Manual Manual pdf 12 page image

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 11Low Frequency Multiplexer ModulesOperating ConsiderationsCurrent RatingsSee the Introduction to the Plug In Modules chapter of the 34980A MainframeUser’s Guide for detailed environmental operating conditions for the 34980Amainframe and its installed modules. That guidance sets maximum per channelcurrent ratings at rated voltage for pollution degree 1 (dry) and pollution degree2 (possible condensation) conditions, for all of the multiplexer modules.Safety InterlockThe Analog Buses of the 34980A are capable of carrying 300V signals. The MUXmodules have a hardware Safety Interlock feature that automatically opens theAnalog Bus relays when the associated interlock pins on the D-sub connectors(faceplate) lose continuity. This prevents signals on the Analog Buses from beingpresent on the D-sub connector pins. Optional terminal blocks available fromKeysight automatically provide continuity for these interlock pins. If cables areused, you must provide continuity for the interlock pins in your DUT assembly.See the pinout information later in this guide for the location of interlock pins oneach module.The MUX modules have Analog Bus relays on each of their two banks. Therefore,the interlock pins are present on both the Bank 1 and Bank 2 D-sub connectorson the MUX modules.Normally, if you attempt to connect to the Analog Buses without a terminal blockor cable connected, an error is generated. TheSYSTem:ABUS:INTerlock:SIMulate command allows you to temporarilydisable errors generated by the Safety Interlock feature and enables thesimulation mode. Although Safety Interlock errors are suppressed in this mode,the actual Analog Bus relays affected by the Safety Interlock are disabled as longas no terminal block or cable is connected to the module.- The simulation mode applies to the entire mainframe and cannot beselectively used on individual modules.- When the simulation mode is enabled, the Analog Bus relays will appear toclose and open as directed. For example, no errors are generated if you closean Analog Bus relay from the front panel, remote interface, or Web Interface.However, remember that the Safety Interlock feature prevents the actualhardware state of the Analog Bus relays from being changed. When youconnect a terminal block or cable to the module, the Analog Bus relays will beclosed.- The simulation setting is stored in volatile memory and will be lost whenpower is turned off. To re-enable the simulation mode after power has beenoff, you must send the command again.The Safety Interlock feature is implemented in hardware on themodules and cannot be circumvented. Regardless of whether thesimulation mode is enabled or disabled, all Analog Busconnections are prohibited as long as no terminal block orproperly-wired cable is connected to the module.Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com