Controls, Connectors,
and
Indicators
5-6
@ CHOP/ALT
Button
CHOP
ALT
The algebraic sum of Channel 1 and Channel 2
is
displayed when the Add display
is
selected. When
both Add and Invert displays are selected, the
waveform displayed
is
the difference between the
Channel 1 and Channel 2 signals. The INVERT
button also inverts the polarity of the signal output
at
the
CH
2 SIG OUT connector on the rear panel. At
the same time, the
Channel 2 trigger-signal polarity
is
inverted so that if
CH
2
is
selected as the TRIGGER
SOURCE, the displayed slope will agree with the
TRIGGER
SLOPE setting.
Selects the vertical display mode for multiple-channel
displays.
CHOP/ALT has no effect on the switching rate
of
X-V
function displays.
If more than one vertical display
is
selected for X-V, the display switches
at
2.5 MHz.
When more than one channel
is
selected, the vertical
display switches sequentially through the selected
channels at the chop-switching rate.
When more than one channel
is
selected, if the
SEC/DIV setting for the displayed sweep is
in
the
range
of
20 Its/div
to
2 Its/div, each channel
is
displayed for 400 ns. Otherwise, each channel is
displayed for
1 its. The chop switching rate is
desynchronized from sweep repetitions
to
minimize
waveform breaks when viewing repetitive signals.
When more than one channel is selected, the vertical
display switches sequentially through the selected
channels. Alternate switching occurs during sweep-
retrace times.
If both A and 8 Sweeps are displayed,
in Alt horizontal mode, vertical switching occurs
at
the completion
of
the
8 Sweep.
The Alt vertical mode enables a slaved delta-time
mode for measuring time intervals between
two
channels.
In
the slaved delta-time mode, the first
selected display
in
the sequence is displayed with the
delta reference delay and the second selected display
in the sequence is displayed with the delta delay.
Any additional channels are displayed with both
delays. The slaved delta-time mode also requires the
following control conditions: either
~t
or
1/~t
selected, Inten, Alt,
or
B horizontal display with the
dual delays and not cursors, multiple vertical
displays, and a
single A-Sweep trigger source.
2465A/2455A/2445A Operators
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