XT2640 Operating Manual
13 July 2016
Page 61 of 187
12.10
USING
THE
XT2640
AS
AN
OSCILLOSCOPE
–
THE
SCOPE
SCREENS
The SCOPE Screen can be selected for view from any of the Main Data Screens by pressing the SCOPE button. There are actually two
totally independent SCOPE screens providing the ability to use the XT2640 as an oscilloscope–
CYCLE VIEW –
Always shows a single fundamental cycle of the waveforms.
Requires no specific configuration.
Time resolution of the greater of 2.6ns or 1/512
th
of a cycle.
You can view the volts, amps and/or watts signals for any channel and/or inter‐phase voltage signals.
You can view the same signal in multiple traces, each with different vertical scaling and offsets.
You can auto‐scale the traces to ensure they fit on the chart.
Allows up to 6 traces to be simultaneously viewed.
Perfect for the inspection of periodic waveforms with extreme amplitude and time detail available.
SCOPE VIEW –
A multi‐channel digital oscilloscope with many enhancements.
Up to 12 channels (volts, amps and/or watts signals in each channel) and/or inter‐phase voltage signals, up to six viewable
at a time.
You can change traces and/or trace scaling without having to retrigger.
All data captured with full 22/24 bit resolution so you can change traces and/or trace scaling without having to retrigger.
You can auto‐scale the traces to ensure they fit on the chart.
You can show the same signal in multiple traces, each with different vertical scaling and offsets.
User configurable trigger and timebase.
Cursor with timebase zoom capability.
Can automatically remove any configured HF filtering and select the HI current range during the scope capture and then
replace the original settings after completion of the capture, perfect for current inrush measurements.
Continuous or single trigger.
Perfect for capturing non‐periodic waveforms and transients (such as inrush current for example).
Which screen is viewed is selected by the upper left button of the SCOPE screen. The presently selected screen view name is
displayed in the button, which toggles every time it is pressed.
Note:
You do not have to be viewing a SCOPE screen for signals to be captured.
12.10.1
VIEWING
PERIODIC
WAVEFORMS
–
THE
CYCLE
VIEW
SCREEN
The above example shows a 200kHz sinewave voltage (in blue) and an almost in‐phase triangle wave current (in red) and includes a
third trace (in green) which is also of the current waveform, but scaled and offset for close inspection of the peak of the triangle
wave. Note that this chart provides <10ns time resolution (there are 512 pixels across the chart) and also note how the use of
vertical scaling and offset can be used to show very fine amplitude details. This is an actual screen image obtained from a XT2640
measuring actual signals, it has not been altered except to scale it to fit on this page. This was obtained using a W type channel card
which nominally samples at just under 1MSPS so this image shows the impact of the advanced sampling method provided by the
XT2640 and also demonstrates how inaccurate it is to state that the sampling rate affects the bandwidth.
If no fundamental harmonic is available then the chart is blank and NO FUNDAMENTAL is displayed in the chart. Cycle view places
every sample in a measurement period at the correct phase in the displayed chart to build a single cycle formed from all cycles
present during the measurement period. To do this it needs the results of the harmonic analysis to position the samples correctly
