Recall; Hp-Ib Codes; How To Recall An Instrument State; Related Special Functions - HP 8642A Operation And Calibration Manual

Model 8642A/B
Operation
Save/Recall (cont'd)
RECALL
How to Recall an Instrument State
HP-IB
Codes
Comments
Related
Special
FlInctions
To recall the instrument state froIll a specific register:
( RECALL) followed by the two-digit number of the desired register.
To recall the instrument state from the next available register (for example, to recall
and modify registers in sequence):
(RECALL)
CO
To recall the most recently saved or recalled register (for example, to get back to a
previous state before it was modified):
(RECALL)
CD
Recalling the last register in this way can get back to a recalled state after modifying
settings.
Keys Codes
SAVE
SV, SVUP, SVDN
RECALL RC, RCUP, RCDN
lIP-lB. Exactly two digits must always be used for Save/Recall register numbers.
Editing the Sequence State
If a change is desired in a register that is saved, the
CD
k.ey can be used to save the
changed instrument state. For example, if, as part of a saved instrument state, an
output amplitUde of -10 dBm was saved in register 06, this amplitude can be changed
to -20 dBm. The following procedure might be used to change the setting in that
recall register:
( RECALL)
OD
rn
C7JAfTIJ)
CJ
m
OD
(GHZ DBtv1] (SAVE)
CD·
How Save/Recall Affects the Next Sequence Register Number
Saving a register will not change the next sequence register number. However,
recalling a register might change the next sequence register number in the sequence if
the recalled register is in the selected sequence.
Recalling an Undefined Register
Recalling a register that is not defined causes messages E93 "RECALL NOT DEFINED
.E93" and HIO "RECALL ERROR FOUND .HIO". These messages could be caused due
to previously executing Special FUIlction
251
(Clear Recall Registers), RAM being lost
(for example if the battery lost its charge), or recalling a register before anything is
sa ved in that register
HP-IB: Executing Error message E93 occurs immediately afer recalling an empty
register. So by noting the occurence of E93
(by
enabling execution errors to pull
SRQ, refer to Sl'rvicl' Rl'quest on page 3 - 27 in the HP -18 portion of this Sect iOIl
IIIl, you could find out which register you recalled was not defined.
251.
Clear Rl'ca II Registers. This speci,tl funet ion clea rs all reca II registers.
3-159