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OPERATION
3.6.5 Trigger Slope
Discussion
The SLOPE key can be used to program the instrument
The level and slope operating modes determine when the
to trigger either on the positive or negative-going
edge of
instrument
is triggered from the applied input signal. If
the input signal. The instrument
can be toggled between
a positive slope is selected, triggering will take place when
these two modes by repeatedly pressing SLOPE. The ac-
the input
signal rises to the preset level that was prw
tive mode is indicated
by the indicators
adjacent to the
grammed
with
the LEVEL key. If a negative slope is
SLOPE key.
selected, triggering will occur when the signal lwel drops
to that preset level.
If the instrument
is in the dual-channel
display mode, or
if the selected trigger source is not the input signal, the
Figure 3-2 will help to demonstrate
slope and level trig-
SLOPE button and associated indicators
are inoperative.
gering. In (A), the instrument
is programmed for a positive
slope with a level of +2.5V. When the input signal rcachcs
the 2.5V threshold
going in a positive direction,
the in-
3.6.6 Trigger
Level
strument is trigered
to begin the measurement sequence.
The programmed trigger level can be entered into the unit
by using the LEVEL key. 7'
'
:his teature
applies c mly when
In (B), a similar situation exists, except that the unit is non
the selected trigger source is the input signal. When LEVEL
programmed
for a negative slope with a level of +I..iV
is first pressed, the instrument
will display the currently
In this case, the unit is triggered once the input signal
txoarammed
tri%er level. A new level can then be pro-
drops to the 1.5V level.
'gr&med
with tlh6 data entry keys.
The allowable range for the trigger level is i2OOV. Program-
ming values above or below this range will result in an ap-
propriate error message. If the programmed value is below
the resolution
of the A/D converter (lOpV), the unit will
round the value to the nearest allowed value.
Note that PV levels can be programmed
with the ps key.
When the instrument
is in the dual-channel
display mode,
the LEVEL button is inoperative.
Example 1: Program a +5V trigger level.
1. Press LEVEL to enter the level entry mode. The instru-
ment will display the presently
programmed
trigger
level. For example, the display might show:
2.55V.
2. Press: 5, V. The unit will now briefly display the pro-
grammed value and return to the previous display mode
with a 5V trigger level programmed.
Example 2: Program a -300&V trigger level.
1. Press LEVEL and note that the presently programmed
trigger level is displayed.
2. Press: ., 3, +/-, mV. Thr new trigger level of -3OO&' is
now prograqmed~
Figure
3-2.
Level
and Slope Triggering
3-13
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