KEPCO BOP VISA Driver (Universal, GPIB) - Manual (Page 9)

BOP-VISA 010906
9
1.2.3 COMPLEX PATTERN GENERATION
When the Destination is set to CURRENT or VOLTAGE, the pattern generator window (Figure 10) can be
used to produce a complex waveform. The complex output is built by adding segments from each of the
four basic waveform types: LEVEL, SINE, TRIANGLE or SQUARE. Each time the GENERATE button is
clicked, the waveform selected is generated using the number of points specified in the Points Window.
Setting Destination set to CURRENT produces a current waveform; a Destination of VOLTAGE pro-
duces a voltage waveform.
Selection of LEVEL means that all four parameters, CURRENT, VOLTAGE and DWELL must be entered
for each point. CURRENT and VOLTAGE must be within the operating range of the Model settings in
effect, otherwise they must be within the rated maximum values of the power supply. DWELL, the amount
of time that the programmed parameters will be in effect, can be set to any value from 0.01 to 655.36 sec-
onds.
The SINE, TRIANGLE and SQUARE waveform types are defined by the following parameters:
• Frequency (Hz) - Determines the dwell time of the waveform segment by 1/F (Hz) = Time (sec).
• Start Angle (deg) - Integer from 0 to 360 - The starting point for the waveform segment (e.g., to
start a sine wave at max positive excursion, the start angle = 90, to start at max negative excur-
sion, start angle = 270).
• End Angle (deg) - Integer from 0 to 360 - The ending point of the waveform segment. E.g., for a
negative half cycle of a sine wave, the start angle = 180, end angle = 360.
• Amplitude (p-p) - The peak to peak amplitude of the complete waveform segment. E.g., if you
want a positive sine wave half cycle (start angle = 0, end angle = 180) from 0 to 15V, the p-p
amplitude for that segment must be set to 30V.
• Waveform offset - The d-c level on which the waveform rides. If the negative excursion of the
waveform is used, the waveform offset must be sufficient to prevent the output from going below
zero, otherwise an error will result when Program RUN is attempted. E.g., if you want a full 15V
p-p sine wave cycle (start angle = 0, end angle = 360) from 10 to 25V, the p-p amplitude =15,
and the offset must be set to 17.5V (if the offset = 0 an error is produced when Program RUN is
attempted because the negative half cycle would require a negative voltage.
• Current (If VOLTAGE destination) or Voltage (if CURRENT destination) - establishes the output
current for a voltage waveform, or the output voltage for a current waveform.
When the segment parameters have been entered, pressing the GENERATE button adds the number of
points specified in the Points window to the list. Note that, particularly in the case of the SINE and TRIAN-
GLE waveforms, the accuracy of the waveshape is affected by the number of points, e.g., a triangle wave
produced using 500 points will be close to a true triangle wave, while one produced using 5 points will
resemble stair-steps.
1.2.4 PATTERN GENERATION, EXAMPLE 1
To generate a single cycle of a voltage sine wave comprised of one cycle with an amplitude of 1 volt peak
to peak riding on a 28 volt level, and a total duration of 1 second, enter the parameters listed in Table 1.