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3156B User Manual
Publication No. 980897 Rev. A
run mode as some combinations legal waveform types may cause
conflicts with run mode types. For example, arbitrary and sequenced
waveforms may not conflict in continuous run mode but if run mode is
changed to burst, an error will occur. The conditions that will cause the
run mode to generate a settings conflict errors are summarized in
Table 3-1 as well.
There are three function calls that are available for programming the
output type. The most important points before you start writing your
programming routines is to decide if both channels will be
programmed to output two different output types or if they will share
the same output type and run modes. Here are the three options:
1. The ri3156b_set_global_operating_mode () - has five variables:
Channel 1 waveform, Channel 2 waveform, Carrier Run Mode and
Operate Enable Source. This function call is the best to use if
channels need to be programmed with different functionality.
2. The ri3156b_set_common_waveform_mode () - has only one
variable that sets both channels simultaneously to the same
waveform mode. This function call would be the best to use if
channels need to be programmed with the same functionality.
3. The ri3156b_set_common_waveform_mode () - allows separate
programming of each channel to a different waveform mode. From
all functions, this is the least recommended function to be used as
it may cause setting conflict errors should one not fully understand
the limitation of the product. For example, the default waveform
mode is Standard. If you use this function call to change the
waveform mode to arbitrary, the 3156B will immediately generate
an error because it has only one sample clock source while
Standard and Arbitrary waveforms use two different sample clock
settings and therefore, this call will generate an error. The Set
Active Channel command is required to program each channel
separately.
The WaveCAD Main Panel can be used for selecting the output type.
Note however, that WaveCAD is using the function call
ri3156b_set_common_waveform_mode () to set up both channel
simultaneously so if you need to set up the 3156B to output different
waveform types from each channel, the only way to use WaveCAD is
from its function call editor, as explained in Chapter 4.
Using the Instrument 3-16
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