Hameg HM1500-2 Скачать руководство пользователя страница 31

Страница: 31 / 35

Subject to change without notice

display may be expanded around the screen centre, increasing
the speed by 10. If the mode is changed from time base A to
”Search“ or ”B only“ all settings of time base A remain intact
including triggering.

26.2

This mode implies alternate time base operation. The readout
will show the speeds of both time bases (”A...“ and ”B...“). The
TIME/DIV-VAR knob will set the time base B speed.

In alternate time base mode part of the time base A display
will be intensiﬁ ed. The horizontal position of the intensiﬁ ed
portion may be shifted using the HORIZONTAL

knob,

provided its function was set to DELAY, this is the case if the
X-POS DELAY pushbutton

is illuminated. The length of the

intensiﬁ ed sector is determined by the speed of time base
B and is equal to the run time of B. Hence this intensiﬁ ed
portion of A will be spread over the full screen as displayed
by B and thus expanded. The Y-position of the signal is the
same when displayed with either A or B. This means, however,
that both displays will be written over each other. In order to
separate them on the screen for better readability an artiﬁ cial
Y offset may be added to the time base B display. Press the
CH1/2-CURSOR-TRACE SEP pushbutton

which calls the

”Pos./Scale“ menu. Press the function pushbutton TB B, this
will cause the POSITION 1 knob to act as the position control
for the time base B display. (Trace separation.) See also 9.1.2
Y-position 2

time base. This function makes sense only in

”Search“ and is unavailable in any other. Also in ”Search“ the
10 x magniﬁ er is available by pressing the pushbutton MAG x10

. The magniﬁ er will affect solely time base B.

26.3

B only

In this mode only time base B will be displayed, the readout
will thus only show the time base B speed in the top left corner
(”B..“). The TIME/DIV-VAR knob will set the time base B speed.
The 10x magniﬁ er is available by pressing MAG x10

and will

expand the display around the screen centre.

26.4

B trigger

–

Edge

In this mode time base B will not start immediately after the
delay time set elapsed, but it will be only set ready waiting for a
signal trigger. This has the advantage that any jitter is removed,
but the delay time adjustment will now only have the effect that
the time base B display will jump from signal period to period
if several periods are displayed. In this setting a positive slope
will trigger.

The (trigger) LEVEL A/B

knob will set the trigger level for

B. Only normal triggering and DC-coupling are possible. All
parameters of time base A remain stored and preserved. (LE-
VEL, auto or normal, Slope, coupling). In addition to the delay
time (”Dt:...“) also the B trigger parameters are shown in the
readout: ”BTr:slope, DC“. In SEARCH mode the trigger point
symbol will be preceded by ”B“. As mentioned changing the
delay time will not cause a continuous move of the intensiﬁ ed
portion of the time base A display and the time base B display,
but jumps from signal period to period.

If the trigger level symbol of time base B is shifted outside the
signal representation by time base A there will be no triggering
of time base B any more and thus no time base B display. The
same holds in time base B only mode.

26.5

B trigger

–

Edge

Except for the negative edge the function is identical to the one
described above (26.4).

26.6

B trigger – OFF

Time base B will be started upon the end of the delay time set.
The delay time can be changed continuously in this mode which
can be watched on the intensiﬁ ed sector of the time base A
display. The disadvantage here is that with very long delay times
jitter of the time base B display may crop up.
As time base B is not operated in the signal triggered mode the
controls for time base B trigger will be disabled respectively
are only for time base A.

HM 1

0-2 - KLB - Stand: 07/1

2/06 gw

HM1

0 - blau - Stand: 07/1

2/06 gw

-2

- gr

n -

07/1

2/06

VAR