The unique method of range chang ing ap plied in this
mode means that the change be tween range 1 and 2 is
ef fected in less than 2
ms. In most cases it is not no tice -
able, al though there may be a slight dis con ti nu ity.
Due to the range- change method, if a trig gered sig nal is
not re peti tive the range change may not set tle in stantly,
and the dis played re sult may be in er ror. This is gen er -
ally true for x- axis times of less than 6 ms where it
takes more than one pass to com pletely up date the dis -
play.
Con trol of
x- axis - Width of
Pro file - Sam ple
Time
The con trol of the time- frames over which the PROFILE is gath ered is very
pre cise, but there are cer tain re stric tions. With care it can be used to dis play
the pro file of sig nals down to typi cally 100
ms or better.
1. Se lect
SYSTEM|PROFILE . The first two items in the menus have al ready
been cov ered (se lec tion of chan nel 1 or 2, and the method of dis play, min max).
The last two se lec tions con trol the data col lec tion PERIOD (the time span of
the win dow). The default pe riod is 10 ms, and it can be ad justed down to 100
ms and be low. If you are still dis play ing the 1 kHz square wave, en ter a pe riod
of 3 ms. The dis play will zoom in to show more de tail of the pulses.
NOTE
Ther mal sen sors have rise and fall times of <4 ms. Do
not use a ther mal sen sor for fast sig nal pro files.
Typi cal MA2470A and MA2440A Se ries sen sors have
rise times of <4
ms. Fall time is typi cally <10 ms, ex cept
at low power lev els. Con sider this when look ing at fast
sig nals.
MA2469A sen sors have rise times typ i cally < 1
ms and
fall times typ i cally < 2
ms.
2. Note that the cur sors have re mained at their set po si tions in time, that is,
when al ter ing the time axis the cur sors stay at their set po si tions in terms of
time - NOT POSITION ON THE SCREEN. This is very im por tant when meas -
ur ing spe cific points or peaks in a sig nal.
3. By al ter ing the DELAY pa rame ter, the PROFILE can be made to look at a
seg ment of time long af ter or very close to the trig ger point. That is, by set ting
the DELAY to 100 ms, the PROFILE will show the 100th pulse (and on wards)
of a 1 kHz square wave. By set ting to ZERO, the pro file will show data im me di -
ately af ter the trig ger has oc curred. This is the DISPLAY TRIGGER DELAY
and is de noted by a small ‘x’ on the PROFILE dis play. This marks the point on
the dis play where data is taken at the time DISPLAY TRIGGER DELAY is
placed. For ex am ple, for the 1 kHz square wave, the pulse edge would oc cur at
the ‘x’ point when ever the DISPLAY TRIGGER DELAY is a mul ti ple of 1 ms.
5-14 ML2400A OM
PROFILE OPERATION MODE PROCEDURES
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