and
*OPC?
Both commands cause the command parser to stop parsing further
commands until a currently running sweep terminates. If one uses
these commands without care, the instrument might enter a state
where it appears to have 'hung up'.
There are two things to consider:
First, sweeps can
be
incredibly long. Especially in
LIST
sweep, one
might sequence up to 100 intervals and each interval might have a
dwell time of up to
100000 seconds. This means a 'full blown' LIST
sweep might last for up to 10E6 seconds (about 116 days!).
Second, a continuous sweep (1NIT:CONT ON) NEVER stops!
To bring a HP El440 back to life, that has been blocked by a
command such as:
'FREQ:MODE SWE;:INIT:CONT ON;*WAI..
. .
<more
commands
>
'
('<more commands>' might be whatever You want
-
it does not
matter because it
will
never be seen by the parser)
issue a <Device Clear> or <Selected Device Clear> command to the
instrument. Using
HP
Rocky Mountain BASIC this can be done as
follows:
1000
!
El440 is at VXIbus address 70911
1010
!
(Select code of controllers VXIbus interface card
:
7
)
1020
!
(Primary VXIbus address of Slot
0
commander
:
09
)
1030
!
(El440 logical address
=
88
right shifted
3
bits
:
11
)
1040
!
1050
CLEAR
7
!
All instruments connected to this
1060
!
VXIbus receives a
DCL.
1080
CLEAR
70911
!
El440 alone is cleared.
Connections
Connection to other VXI mainframe modules or external test
equipment, is achieved through the front panel BNC connectors in a
conventional way.
4-18
Understanding
the
HP
E1440A
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