User Manual California Instruments
94 CSW Series
3.15.2.2 Analyzing waveform data
The data displays available for acquired waveform data allow you to scroll through the entire
acquisition buffer. For waveform displays, the knob can be used to scroll through the display
horizontally. The UP and DOWN cursor keys have no effect in this display mode.
Counter
Clock
wise
Clock
wise
INCRDECR
Figure 3-41: Scrolling through acquired waveform data
The acquisition buffer may be longer than the selected horizontal scale in which case only a
portion of the acquisition window will be visible. The left portion of the LCD display is used to
read out the data under the vertical cursor. This cursor is a dotted line that can be moved using
the knob. If the left or right edge of the display window is reached, the entire display will shift so
the cursor always remains visible. The time from the trigger point to the vertical cursor is
displayed in the left hand portion of the LCD in ms. Also displayed here are the absolute voltage
and/or current value under the cursor.
To change the horizontal display scale without re-triggering an acquisition, press the ENTER
key to return to the HARMONICS/TRACE ANALYSIS screen, change the SCALE value, move
the cursor to the VIEW field and press ENTER. This will display the same data set at the new
scale without triggering a new acquisition.
3.15.3 Triggering Measurements
Both FFT results and waveform acquisitions may have to positioned at a specific moment in
time. To allow the data acquisition to coincide with user specified events, the measurement
system can be triggered in different ways. Trigger modes are available from both the bus and
the front panel. If the IEEE-488 or RS232C bus is used, acquisitions may also be triggered from
the transient list system. Refer to the programming manual for details on this mode of operation.
3.15.3.1 Trigger mode
The following trigger modes are supported by the CSW Series:
Single (SINGLE) This mode causes the acquisition system to be armed only
once. The CSW source waits for the user to press the ENTER
key while on the START field. As soon as the trigger event
specified occurs, data is acquired and the acquisition system is
put in an idle state. A new user initiated START event must be
given to trigger an new acquisition.
This mode is appropriate for capturing events that occur only
once such as the inrush current when turning on a load.
Continuous (CONT) This mode causes the trigger system to re-arm itself after each
trigger event. Every time a new trigger event occurs, new data
is acquired and the LCD display is updated. No user
intervention is required after the initial START event.
Readouts on the
left track the
vertical cursor
position on the
waveform.
Trigger point is
at 0.0 ms.
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