Conditions For Cursors Display; Measurement Cursors; Track Trig Lvl Cursors - Tektronix 2247A Operator's Manual

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Operators Familiarization .
label Is selected (underlined). If the trial measurement results do not
allow X10 RE SOL mode either, "NOT POSSIBLE~ " Is displayed by
the X10 RESOL label for one second, the mode Is automatically
switched to AUTO RESOL, and the measurement proceeds In auto
resolution mode. If X10 RE SOL mode Is possible, the measurement will
proceed as described above for X 1
O
RE SOL mode.
If X100 RESOL mode Is possible, the measurement time Interval
required to get two more fully resolved digits Is calculated ' . If thi s tlm
Is greater than 5 seconds, the message "MEASMT TIME XXXX s" I
displayed to the left of the X100 RESOL label , where XXXX Is thl
measurement time interval in seconds. If this time interval Is great r
than 9999 seconds, the message "MEASMT TIME >9999s " is di spl ay d
Instead. The measurement then proceeds using this new measurem ont
time Interval.
C/T TRIG TIMEOUT-This Is the last Item In the C/T control m enu .
Each time the menu button for this Item Is pressed, the Item Is elth r
selected (underlined) or deselected (not underlined) . When select d
(the default setting when a C/T measurement Is first called up) th
C/T will wait for approximately 400 milliseconds to receive a start t rig
ger, or, If a start trigger has been received, the CIT will wait th at long
for a stop trigger ( C/T measurements start and stop synchronou ly
with the trigger signal being measured). If the CIT times out whll
waiting for a trigger edge, an appropriate error message Is dis play d
(see earlier section on C/T error messages). To measure a signal with
a duration longer than 400 milliseconds, C/T TRIG TIMEOUT can b
toggled off. This allows signals to be measured that have duration s up
to 100 seconds (actually, 99. 999999 seconds) .
Conditions for Cursors Display
The following Information Is an aid In understanding the order In which th
menu measurement cursors are displayed.
Measurement Cursors
One or two measurement cursors may be displayed if any one of th fol -
lowing conditions Is met:
VOLTMETER CH1 /CH2-TRACK MEASMT Is underllned n
measurement source channel Is on and the VOL TS/DIV VAR control In
detent.
CURSOR VOL TS-Measurement source channel must be on n I
VOL TS/DIV VAR control In detent.
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TIME-Horizontal MODE Is In A or Horizontal MODE is ALT or B and
I+-
~
Is selected.
Track Trig Lvl Cursors
If less than two cursors are currently displayed, ,trigger level cursor ( s) for
the B Trigger C/T measurement source(s) will be displayed If :
TRACK TRIG L VL Is underlined , and
the Horizontal Mode Is valid for selected CIT measurement , and
the Trigger Mode and Coupling are valid.
If less than two cursors are currently displayed ,; trigger level cursor for the
A Trigger will be displayed if:
TRACK TRIG L VL Is underlined and the Horizontal Mode Is A or ALT,
and
the Trigger Mode , Source, .and Coupling are valid, and
the A trig source channel is not the same as the CIT measureme~t
channel while a C/T measurement is running and displaying a B tng
cursor .
,
If less than two cursors are currently displayed , a trigger level cursor for
the B Trigger will be displayed if:
TRACK TRIG LVL Is underlined, and
the Horizontal Mode Is ALT or B , and
the Trigger Mode, Source, and Coupling are valid .
Track
th
Cursors
'
.J
J
If one or no measurement or trigger level cursor Is displayed, up to two
ground cursors (not more than two cursors total) may be displayed If the
following conditions are met:
TRACK
,h
Is underlined and CH 1 and/or CH 2 VERTICAL MODE is
selected.
Trigger-source channel (CH 1 and/or CH 2) VOLTS/DIV VAR control
Is In detent.
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