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IEEE-488 PROGRAMMING
Table 4-9. Function
Commands
Command
Description*
FO
Waveform (single samples)**
Fl
Average of measurement.
FZ
TRMS of measurement.
F3
+I'eak of measurement.
I3
-Peak of measurement.
F5
Peak-to-peak value of measurement.
F6
Standard deviation
of measurement.
F7
Integral of measurement.
F20
Channel
1 reading minus channel 2
reading.
F21
Channel
measurement
divided
by chan-
nel 2 reading.
*Result of math function
is placed in the next available
reading buffer location when buffer is enabled.
**Each request for data accesses subsequent
sample.
NOTES:
3~. Only one mathematical
function can be used at a time.
It is not possible, for example, to take the standard devia-
tion of the average reading.
2. Ratio and difference
modes are available only if the
Model 1944 option is installed in the channel 2 location.
HP-85 Programming
Example-Type
in the following
lines
to program
the instrument
to take the average of the
measurement
buffer:
When the END LINE key is pressed the second time, the
instrument
displays the average of the samples located in
the measurement
buffer.
Model 8573 Programming
Example-Type
in the follow-
ing statements to display the average of the samples in the
measurement
buffer:
Note that the instrument
displays
the average of the
samples after the return key is pressed the second time.
4.9.3 Range (R)
The range command, and its options, give you control over
the measurement
sensitivity
of the instrument.
Esstmti~l-
ly, this command performs the same functions as the front
panel AUTO, Uprange, and Downrange
buttons.
Range command options arc listed in Table 4-10. Resolu-
tion values for the four ranges for both eight and X-bit
modes are also given. For sampling
rates above 'IOOkHz
(interval less than 10~s~ or if more than 32,768 samples
are programmed),
the A/D converter operates in the R-bit
mode, resulting in reduced resolution. Paragraph 3.3 covc'rs
instrument
ranges in more detail.
Upon power up, or after a VCL 01' stx
comm;md,
the
instrument will assume a range determined by the SETUP1
(Al) configuration.
Factory default is Rtl (.auto).
Table 4-10. Range Commands
Command
__.--
1~0
RI
R2
R3
114
Rl2
Resolution
j
8q
16-Bit I
2.56mV
IO ,iv j
25.6 IV
100 jr\'!
256
II&[
1mV j
2.56 V'
IOmV ~
Cancel auto*
--!---pmi
*Instrument
stays on present range when autorange is
cancelled.
HP-85 Rogramming
Example-Using
the front
panel
AUTO button,
cancel autoranging,
if enabled, and type
in the following
statements:
Note that the instrument
changes to the autorange mode
when the second statement above is executed.
4-21
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