The x- axis no men cla ture al ways de notes this point with a time of ZERO (t=0),
this al lows the user to al ways con sider time in ter vals rela tive to the dis play
trig ger which is usu ally the point of in ter est.
NOTE
For smaller val ues of dis play trig ger de lay, it is pos si ble
that the dis play will cover time in ter vals (on the left of
the dis play) for which there is no data. In these con di -
tions, the cur sors are nor mally pre vented from dis play -
ing data taken there as it will be in
er ror (there is no data). The po si tion of ‘x’ is nomi nally
10% of the screen. This can be al tered to any per cent age
the user re quires in the
SYS TEM|more|more|GRAPH ICS pref er ences menu as
the PRETRIG GER per cent age. It can also be set to
ZERO to re move pretrig ger data and pre vent con fu sion
in cases of small dis play trig ger de lays.
Pro file can dis play A, B, or A–B meas ure ments. Note
that in the case of a ra tioed meas ure ment (A–B), the
data is cal cu lated as a straight dB dif fer ence (not a LIN -
EAR mw dif fer ence). This is not the same as a MODU -
LATED POWER AV ER AGE meas ure ment.
4. As well as the CURSOR read outs de scribed above, the POWER AVERAGE
method can be used to dis play the av er age power be tween the two cur sors.
This is per formed as a TRUE AVERAGE and is the ac tual av er age of all the
data points be tween and in clud ing the cur sors. By plac ing the cur sors on the
top of a pulse, the flat top power can be meas ured. By plac ing the cur sors with
a pe riod of the pulse, the av er age power of the pulse is cal cu lated. This is more
ac cu rate than a sim ple duty cy cle cal cu la tion which makes as sump tions about
the pulse shape. Use the
SENSOR|AVERAGE menu to enable this read out
method.
NOTE
The dis play reso lu tion is 200 pix els. Con sider this ef fect
on the reso lu tion of tim ing data. For ex am ple, a 1
millisecond PRO FILE win dow would have a cur sor
reso lu tion on the dis play of 5 microseconds.
The LIM ITS test func tions on PRO FILE data, and can
be con fig ured to BEEP on fail con di tions.
Ad vanced Trig ger ing
and Setup Op tions
The other as pects of trig ger ing al low for fine tun ing of the trig ger con di tions.
This in cludes:
1. Se lec tion of HIGH or LOW go ing edge in Ex ter nal TTL .
2. Level set ting on In ter nal A or B trig ger, as well as po lar ity - HIGH or LOW
go ing.
ML2400A OM 5-15
PROCEDURES PROFILE OPERATION MODE
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