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allowed), press the [HELP] key. LOC is on when-
ever local front panel control is allowed (usually
on).
SRQ
This indicator is on whenever a GPIB Service
Request is generated by the SR850. SRQ stays
on until a serial poll is completed.
ALT
Indicates that the ALTERNATE keypad is in use.
The ALTERNATE keypad uses the alphabetic leg-
ends printed below each key. To enter the ALT
mode, press the [ALT] key once. Pressing the
keys will now enter letters into the active entry
field. The [0]...[9], [.], [-], [←] and [ALT] have the
same function in the ALTERNATE keypad. To
return to the normal keypad, press the [ALT] key
again.
Screen Display