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Фрагмент инструкции
e. If foldback protection is desired, press FOLDBACK pushbutton switch to enable this feature. f. If a load change causes the current limit to be exceeded, the power supply automatically crosses over to constant current operation and the output voltage drops proportionately. If foldback protection is enabled, mode crossover causes the power supply output to be disabled. In setting the current limit, make adequate allowance for high current peaks that could cause unwanted mode crossover. Operating Instructions 43 Constant Current Operation To set up the power supply for constant current operation: a. With power supply turned off, connect load to output terminals. b. Turn on power supply. Hold in DISPLAY OVP pushbutton switch and set OVP ADJUST potentiometer for desired OVP trip voltage. In CC mode the voltage setting will limit output voltage under quiescent conditions, and the OVP circuit provides added protection against hardware faults. c. Press OUTPUT ADJUST pushbutton switch once so that VOLTAGE indicator turns on, hold DISPLAY SETTINGS pushbutton switch in, and rotate OUTPUT ADJUST knob to set desired voltage limit. d. Press OUTPUT ADJUST switch once so that OUTPUT ADJUST knob controls current, and adjust output current to desired level. e. If foldback protection is desired, press FOLDBACK pushbutton switch to enable this feature. f. If a load change causes the voltage limit to be exceeded, the power supply automatically crosses over to constant voltage operation and the output current drops proportionately. If foldback protection is enabled, mode crossover causes the power supply output to be disabled. In setting the voltage limit, make adequate allowance for voltage peaks that could cause unwanted mode crossover. Return to Local If the power supply is under remote control (RMT indicator on) and local lockout has not been sent (see Page 46), pressing the LCL pushbutton switch will return the unit to local (front panel) control. Holding the LCL switch in will prevent the power supply from returning to remote control for as long as the LCL switch is held in or until local lockout is sent. If the power supply has been disabled via GP-IB, or remote inhibit (DISABLED indicator on), the LCL switch will not restore the output. The only way to re-enable locally is to turn the LINE switch off and then back on. The OUTPUT ADJUST controls continue to operate in local control even if the power supply is disabled. NOTE Once the soft limits have been set by the controller via GP-IB, the OUTPUT ADJUST knob cannot be used to obtain a higher output beyond these limits. This condition is true for both local and GP-IB control. GP-IB Operation Interface Functions The power supply implements the following GP-IB interface functions, which are defined by IEEE standard 488: SH1 (Source Handshake) AH1 (Acceptor Handshake) T6 (Talker) L4 (Listener) SR1 (Service Request) RL1 (Remote Local) PP1 (Parallel Poll) DC1 (Device Clear) DT1 (Device Trigger) 44 Operating Instructions Multiline Message Control Functions. The Acceptor Handshake, Source Handshake, Listener, and Talker functions are implemented by the interface circuits of the power supply and the controller and require no action by the user. The LSN or TLK indicators turn on when the power supply is addressed to listen or talk. (The talker function includes serial poll, see below). Service Request. Service request is a uniline message that can be asserted by the power supply to interrupt the controller. Service request can be generated by a power supply fault condition. The operator defines which of eight power supply conditions are defined as faults. Enabling or disabling a condition from asserting service request does not affect the condition within the power supply, nor does it affect the front-panel status indicators. Page 62 provides instructions for unmasking service request capability. A service request can also be generated at power on (PON), depending on the setting of the rear-panel PON SRQ switch. Therefore, with PON SRQ enabled, if a momentary power dropout causes the power supply memory to lose its programmed values, PON alerts the operator that the power supply has been initialized (see Page 47). If the power supply fails self test at power on it will not respond to serial poll or any other commands on GP-IB. The user should include a time-out in his program after which the controller will not wait for the power supply to respond. If the time- out occurs, the power supply can be assumed to be malfunctioning and should be removed for service. The SRQ indicator turns on whenever the power supply is requesting service from the controller, and remains on until the controller conducts a serial poll. Serial poll resets the SRQ bit and turns off the SRQ indicator, regardless of whether the fault that caused service request continues to exist. Serial Poll. In a serial poll the controller can poll each device on the bus, one at a time. The power supply responds by plac...
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