Specifications

Using the DMM and ARB 71Chapter 4
modulated waveforms. This action has the following functionality:
1. Square wave generation
2. Positive and negative ramp generation
3. Positive and negative pulse generation
4. Burst modulation
5. Phase shift
6. Pulse width for positive and negative pulses, and burst pulses.
To correctly generate a waveform, it is important to understand how to set
some of this action’s different parameters. These are explained as follows:
frequency - Specifies the output frequency if the waveform is NOT a
“burst” waveform (‘F_burst’ parameter set to “0”). If “burst” is used,
this is the frequency of the burst wave, as shown in Figure 4-4. (Note:
“burst” can not be used in the positive or negative pulse functions; i.e.,
functions 5 or 6, respectively.)
Tpulse_width - Sets the pulse width of the positive or negative pulses
function (for functions 5 and 6, respectively) or sets the width, in
seconds, of the burst wave, as shown in Figure 4-4. If used with
“burst”, the pulse width must be less than 100 mS.
F_burst - If set to “0”, no “burst” is generated. Otherwise, this sets the
waveform frequency that is to be modulated by the burst wave (the
burst wave frequency is set by the ‘frequency’ parameter), as shown in
Figure 4-4.
phase_shift - Specifies the amount of phase shift in a waveform in
degrees, relative to a non-phase shifted version of itself.
force_seg_count - If set to “0”, the frequency accuracy is generated
using the 2 µS clock cycles plus any number of 100 nS clock cycles
needed to make the frequency accurate. This is illustrated in the
following formula:
segments = (1 / frequency) / (2 µS + (100 nS * clockadj))
where ‘clockadj’ is used to add 1 or more 100 nS ticks to the 2 µS
clock.
If this parameter is set to “1” (or “-1”), the number of segments closest
to the frequency value will be used, without using ‘clockadj’. Only the
2 µS clock is used without the 100 nS clock. This is illustrated in the
following formula:
segments = 1 / (frequency * 2 µS)
Normally, ‘force_seg_count’ is used (set to “1” or “-1”) if you wish to
have the segment counts of two waveforms be a multiple of each other
to guarantee phase lock. However, this method uses more segment
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