TDS5000B Online Programmer Guide
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MATH<x>:VERTical:POSition
Description
This command sets or queries the vertical position of the specified
Math waveform. The Math waveform is specified by x, which ranges
from 1 through 4 for four--channel instruments or 1 through 2 for two--
channel instruments. The position value is usually applied to the signal
before it is digitized. The highest three units/div scale ranges of a given
math are implemented by changing the way the acquired data is dis-
played. When the instrument is operating in any of these highest three
scale ranges, the position control operates only on the signal after it is
digitized. Note that if a signal that exceeds the range of the digitizer in
one of these three scale ranges is repositioned, the displayed waveform
will contain clipped values on --screen. This command is equivalent to
selecting Position/Scale from the Math menu and then entering a Vert
Pos value or adjusting the front--panel Vertical POSITION knob.
Increasing the position value of a waveform causes the waveform to
move up, and decreasing the position value causes the waveform to
move down. Position adjusts only the display position of a waveform,
whether a channel, math, or reference waveform. The position value
determines the vertical graticule coordinate at which input signal val-
ues, equal to the present offset setting for that reference, are displayed.
For example, if the position for Math 3 is set to 2.0 and the offset is set
to 3.0, then the input signals equal to 3.0 are displayed 2.0 divisions
above the center of the screen.
Be aware that autoscaling occurs when a math waveform is first defined
and enabled, or when a math string changes. After the math waveform
is computed for the first time, the instrument determines the min + max
of that waveform data. Then, the instrument sets the math position so
that (min + max)/2 is in the center of the screen. In addition, the instru-
ment sets the math scale so that the range of the min and max cover 6
divisions. This autoscaling process can take up to 1/2 second to com-
plete and will override any vertical scale or position commands for that
math waveform received during this time. You should insert an ap-
propriate pause in your program after defining and enabling a math
waveform before changing its position or scale.
Group
Math, Vertical
Related Commands
CH<x>POSition, REF<x>:VERTical:POSition
Syntax 1
MATH<x>:VERTical:POSition <NR3>
Syntax 2
MATH<x>:VERTical:POSition?
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