HP 8508A - Power-On Default Conditions

. Operation
SYSTEMS
Local Lockout. Local lockout disables the LCL key and allows return-to-local only under program control. Local
Lockout is recommended for purely automatic applications.
' Remote-to-Local. The instrument switches to local whenever it receives the Local message (GTL) or the Clear
Lockout/Local message (REN false). If not in Local Lockout mode, the instrument switches to local when the
front panel LCL key is pressed. as
NOTE
Return-to-local can also be accomplished by setting the Vector Voltmeter’s LINE switch to OFF then to ON.
However, this technique has some disadvantages:
a. It defeats the purpose and advantage of Saag lockout (that is, the system controller loses control of a system
-element)..
b. There are several HP-IB conditions which reset to default states at turn-on.
Addressing
The Vector Voltmeter’s HP-IB address is stored in permanent memory, so that it is remembered through power
cycling. The address can be set from the front panel as follows:
a. Press [SHIFT] [ADDRESS] to display the current address.
b. Use the arrow keys to select the required address (0-30), which becomes effective immediately.
The instrument’s normal address setting is 8
c. Press [SHIFT] [ADDRESS] or any other function to return to normal operation.
The Vector Voltmeter can be Addressed to Listen, Addressed to Talk, or Unaddressed. It is Addressed by putting
either its Listen Address (HP-IB Address + 32) or its Talk Address (HP-IB Address +64) onto the bus in command
mode (ATN true & IFC false). It remains Addressed to Listen until it receives its Talk Address or a Universal
Unlisten command. It remains Addressed to Talk until it receives its Listen Address or an Untalk command.
Power-on Default Conditions
Several HP-IB parameters are reset at power-on. The parameters and their default conditions are listed below.
* HP-IB Local Mode
* Unaddressed
* Service Request Enable Register cleared
* Status Reporting Structure cleared
* Trigger Source Freerun
* Display State active
Should the Vector Voltmeter fail part of its power-on test sequence the Error code will be placed in the Error
Queue. (See also SYSTem:ERRor?)
3-28 E1089
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