Specifications

76 Using the DMM and ARB Chapter 4
Downloading User Defined Waveforms
This “Arb_Dl_Custom_Waveform” action uses several double and single
dimensioned array type parameters to set the voltage segments, sequences,
markers, dwell, next sequences, and other values to download and generate
user defined custom waveforms.
Figure 4-3 shows a typical custom waveform. The figure shows a triangle
waveform that shows the relationship between the segments, sequence, and
segment execution time.
To generate a waveform, it is important to understand how to set the
different parameters of the action. This is explained as follows:
voltage - Specifies the voltage value of the waveform segments for one
or more sequences (voltage range is ±16.4 V). This is a double
dimensioned array where the column is the sequence number and the
rows are the segment numbers. Figure 4-7 shows a typical example.
marker - Specifies a marker on the selected segment in a valid sequence.
The marker pulse will only be output if the sequence is non zero. The
marker signal always appears on the Arb’s front panel BNC connector.
It can also be routed to the VXI TTL backplane. Figure 4-8 shows a
typical example on how to specify markers.
nr_sequence - Specifies the number of sequences to be downloaded.
This value must be “1” or above, or no waveform will be downloaded.
If more than one sequence is available and the parameter is set to “1”,
Figure 4-6. Arb Waveform
The values in this example produces a 2 Vpeak, 1 kHz ramp, as shown below; the waveform was generated
Note: The Arb output looks more “staircased” on an oscilloscpe due to the 47.62 µS/segment time.
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
using the following values
and Stop / Start values of
0.000 / 0.001
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