Introduction
The figure below shows how the instru
-
ment functions are categorized. This in
-
strument model is fully compatible with
the SCPI generalized instrument model.
The generalized SCPI instrument model,
contains three major instrument catego
-
ries as shown in the following table:
Function Instrument
Type
Examples
Signal ac
-
quisition
Sense in
-
struments
Voltmeter,
Oscilloscope,
Counter
Signal
genera-
tion
Source in-
struments
Pulse genera-
tor,
Power supply
Signal
routing
Switch in-
struments
Scanner,
(de)-multiplexer
An instrument may use a combination of
the above functions. The counters belong
to the signal acquisition category, and
only that category is described in this
manual.
The instrument model in Figure 5-1 de
-
fines where elements of the counter lan
-
guage are assigned in the command
hierarchy. The major signal function ar
-
eas are shown broken into blocks. Each
of these blocks are major command
sub-trees in the counter command lan
-
guage.
The instrument model also shows how
measurement data and applied signals
flow through the instrument. The model
does not include the administrative data
flow associated with queries, commands,
performing calibrations etc.
5-2 Introduction
Instrument Model
A
B
C
E
1
2
3
4
GPIB
MEMoryTRIGger
OUTPut
FORMat
DISPlay
Measurement Function
Inputs Channels
Figure 5-1 Model '9X' instrument model.
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