Racal Instruments 3156B, Руководство пользователя

Страница: 89 / 385

3156B User Manual
Racal Instrument © 2005 Using the Instrument 3-39
Continuous Run
Mode
The following function calls need to be executed to generate
continuous waveforms:
ri3156Bset_output (1)
Turns output on by activating hardware
connection to the front panel
ri3156Bset_enable (1)
Output is enabled. This is a software
enable command. If you intend to use
hardware enable you have to select the
hardware enable source with the
ri3156B_set_enable_source () function
Note that the above sequence is valid for non-modulated waveforms
only. Also, the continuous run mode is the default run mode and
therefore, after reset or power up, there is no need to specifically
select this run mode.
Triggered Run
Mode
In Triggered run mode, the output remains at a certain DC level until
the operate enable (or trigger) signal initiates a single output cycle. If
hardware source is selected for the enable command, the edge
sensitivity can be program for either the rising or the falling edge of the
input signal. Each time a transition at the trigger input occurs, the
Model 3156B generates one complete output waveform. At the end of
the output cycle, the output resumes position at a DC level that is
equal to the amplitude of the last point of the waveform.
To place the Model 3156B in Triggered mode, use the following
function call:
ri3156B_set(query)_carrier_run_mode (1)
Variable number 1 selects the trigger run mode.
The 3156B can also be programmed to re-trigger itself, after a valid
trigger command, to run continuously in triggered mode with a delay
between triggers, which is set with the re-trigger delay parameter. Use
the following function call to place the instrument in re-trigger mode:
ri3156B_set_re_trigger_delay_state (1)
The variable 1 turns the re-trigger delay state on. Use the following
function call to program the re-trigger delay interval:
ri3156B_set_re_trigger_delay ()
The delay is programmable in units of
μ
s from 0.5
μ
s to 21s.