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Combining Output Channels
As described on page 34, multiple outputs may be combined to obtain higher
voltage or current outputs. A triggered output is recommended for combined
channels. The general sequence used to control combined channels is:
1. Set the trigger source.
2. Close the output relays.
3. Set the desired output on all combined channels.
4. Trigger the output.
For example, when three current channels are combined in parallel as
shown on page 34, the following commands can be used.
/* Set the trigger source for external trigger */
TRIGger:SOURce EXT
/* Close the output relays */
OUTPut9 ON
OUTPut10 ON
OUTPut11 ON
/* Set channels 9, 10, and 11 for triggered output */
SOURce9:CURRent:TRIGgered MAX
SOURce10:CURRent:TRIGgered MAX
SOURce11:CURRent:TRIGgered .0100
/* Put the trigger system in the wait-for-trigger state */
INITiate
/* Wait for the trigger event */
/* When the trigger occurs… */
/* …output 50 mA */
When combining channels in parallel, for increased current output, channels
may be configured with either isolated or non-isolated plug-on modules.
When combining channels in series, for increased voltage output, all
combined channels MUST be configured with isolated plug-on modules.
CAUTION When combining output voltage channels (series connections) you must
ensure that the output does not exceed the maximum isolation rating of ±42
Vdc/42 Vpeak. Up to three channels may be combined, but the controlling
program must ensure that all three channels together are NEVER set
beyond ±42 Vdc.
Chapter 2 Programming Examples 57