Tektronix 2246 User Manual

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OTHER
OPERATING
FEATURES
USING THE TRACK
TRIG LEVEL CURSORS
For most general purpose applications, the AUTO
LEVEL
Trigger
MODE
provides
the
user
with
the
easiest
method to obtain stable waveform triggering. When infor-
mation regarding the actual trigger level setting is needed
to set special triggering levels for NORM or SGL SEQ
triggering, the user may use the TRACKING CURSORS
features of the oscilloscope. The TRACK TRIG LVL cur-
sors provide both a visual indication of location and a
numeric readout of the Trigger LEVEL control setting. in
ALT Horizontal MODE (with the A Intensified and the B
Delayed traces both displayed) the A and the B TRACK
TRIG LVL cursors will be displayed (see Figure 6-16). The
A Trigger LEVEL may be set when the trigger controls are
directed to the A Trigger system (by the A/B SELECT
switch), and the B Trigger LEVEL may be set when the
trigger controls are directed to the B Trigger system.
The Trigger LEVEL cursor will be displayed when
enabled if the following conditions exist:
1. The Trigger SOURCE is either CH 1 or CH 2
(selected directly or VERT SOURCE), and
2. The Trigger SOURCE channel is displayed, and
3. The Trigger CPLG is DC, NOISE REJ, or HF REJ,
and
4. The Trigger mode is AUTO LEVEL, AUTO, NORM,
RUNS AFTER or SGL SEG.
Additionally, the A Trigger LEVEL cursor is displayed in
A and ALT Horizontal MODE, and the B Trigger LEVEL
cursor is displayed in ALT or B Horizontal MODE (both
displayed in ALT if conditions are met).
NOTE
If the TRACK rh auto-tracking measurement is on,
only one of the TRIGGER LVL cursors will be on in
ALT Horizontal MODE. The A TRIGGER LVL cursor
will be the default display if the the conditions are
met to display an A TRIGGER LVL cursor. Other-
wise, it will be the B TRIGGER LVL cursor that is
displayed when all the listed conditions have been
met to display a B TRIGGER LVL cursor.
The labels for the Trigger Level cursors are:
ATL A trigger level
BTL B trigger level
The A and B Trigger LEVEL readouts include the sign,
the integer and decimal fractional value of the level, and
the units when a cursor is displayed. For example:
ATL +3.25 mV
POEreere rc reertr ci rerr rrr i retiree sires
The A and B Trigger Level Cursors are not guaranteed
to reach the waveform if the Horizontal POSITION control
is set fully cw. Also, since the Trigger LEVEL cursor may .
be located anywhere within the viewing area (and beyond),
the labels for those cursors may overlap each other or the |
+PK, —PK, and DC or TRACK mh cursor labels in the
displays.
The trigger cursor channel is determined from the
Trigger source as indicated in Table 6-3.
Table 6-3
Trigger Cursor Channel
A Trigger Source A Cursor Channel
VERT Lowest numbered channel
displayed (CH 1 or CH 2)
CH 1 CH 1
CH 2 CH 2
CH 3 Not used
CH 4 Not used
Not used
B Triger Source 8 Cursor Channel
Lowest numbered channel
displayed (CH 1 or CH 2)
CH 1 CH 1
CH 2 CH 2
CH 3 Not used
CH 4 Not used
Not used
6-19

Tektronix 2246 Specifications

General

Brand	Tektronix
Model	2246
Category	Test Equipment
Language	English