HP 8112A, Operating, Programming And Servicing Manual

Page: 86 / 406

Note
Duty Cycle Error
(Bit 4)
Note
6-16
Programming
•
No valid waveform at the output:
a. LEE
>
WID x0.8 or
(PERx DTY /lOO) x0.8
b. TRE
>
(PER-WID) x0.8 or
PER-{PERxDTY /lOO)) x0.8
c. TRE
�
(DBL-WID) x0.8 or
DBL-{PERx DTY /200)) x 0.8
d. TRE
�
(PER-DBL-WID) x0.8 or
PER-DBL-{PERx DTY /200)) x 0.8
•
No calculation with "SRl"
The "EXCESSIVE SLOPE" error message and calculation can be
suppressed with the SRO command. This will reduce programming
time.
Example
OUTPUT 712 ; "SRO "
This is particularly useful for character strings where a multiple of
the same timing parameter is programmed such as
OUTPUT 712 ; 11SR0 11
FOR A
=
1 to 100
OUTPUT 712 ; "PER (CHR$ A) MS "
NEXT A
Immediately upon receiving the new PERIOD value, the HP 81 12A
would calculate the excessive slope error for each period time
interval. By suppressing "EXCESSIVE SLOPE" , new settings for
Period are accepted by the instrument without any calculation, and a
reduction in programming time of typically 30 ms may be achieved.
In the permanently stored Mode/Parameter settings in the
HP 81 12A ROMs, "SR" is set to "O" (zero). If these settings are
recalled
as
current settings, the Service Request function can be
re-activated by programming "SR" to "1".
OUTPUT 712 ; 11SR1 11
The key re-activates the Excessive Slope Error.
There are three types of error which set the duty cycle error bit
in the status byte. The conditions which cause them and the
description used by the HP 81 12A when replying to an
IERR
command are listed below. The timing error bit is not latched,
therefore a transient error is only recorded by generating an SRQ.
More than one error condition can occur at one time. When using
the
IERR
command ensure that you allow for a reply containing
more than one error description.