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IEEE-488 PROGRAMMING
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Model 8573 Programming
Example-Cancel
autorange (if
enabled) by using the AUKI button and type in the follow-
ing statements:
Note that the instrument
goes into the autorange mode
when the above statements are executed.
4.9.4 Rate (S)
The rate (S) command allows the sampling rate to be pro-
grammed over the bus. This command performs the same
operation
as the front panel RATE button except that in-
formation
can only be entered in units of set (interval) or
Hz (frequency).
Note that the A/D converter operates with
&bit resolution
for sampling
rates less than 10~s~.
The rate command general format is shown in Table 4-11.
Sampling
rate in seconds: SO,m, where m is in sec.
Sampling
frequency:
Sl,m, where m is in MHz.
Upon power up, or after a DCL or SDC command,
the
rate parameter will assume a value determined
by SETUP
1 (Al). Factory default is 166.7flec.
Table 4-11. Rate Commands
HP-85 Programming
Example-Enter
the statements below
to program a 1OOpsec rate:
When the second statement above is executed, the instru-
ment is programmed
for a sampling
interval of 100rsec.
Model 8573 Programming
Example-Type
in the follow-
ing statements to program a sampling
rate of 100~sec:
4.9.5 Number
of Samples
(N)
The N command allows you to program the number of
samples to be taken during a measurement
sequence, or
in measurement duration in a manner similar to that used
with the SAMPLES key on the front panel. The general
format for this command is shown in Table 4.12. Note that
the maximum number of samples that can be programmed
depends on whether the AID converter is operating in the
8 or 16.bit mode. For sampling rates above 100kHz (less
than lopsec), or for more than 32,768 samples, the con-
verter operates in the &bit mode.
When using the Nl command to program measurement
duration,
the resulting
number of samples will be one
more than you might expect. For example, programming
a duration
of 100msec with a sampling interval of lmsec
will result in 101 samples.
Upon power up, or after a DCL or SDC command,
the
instrument
will assume a value determined by the SETUP
1 (Al) parameter. Factory default is 101 samples.
Table 4-12. Number
of Samples Commands
Take m samples per
measurement
HP-85 Programming
Example-Type
in the following
statements to program the instrument
for 1000 samples:
RE:P,OTE 78'3
I:,l.ITPliT 7rj'?i i i ,.., (j, j.(j@p::.::! ?
When the second statement above is executed, the instru-
ment will be programmed
to take 1000 samples.
4-22
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