Tektronix 2247A

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Operators Familiarization
Counter/Timer
Press the COUNTER TIMER button to call up the C/T measurement
choices.
In the (CTR/TIMER) menu, selecting a measurement will cause the menu to
disappear (If menus are configured to clear after selection). Selecting
TOTALIZE causes the totalize RESET label to appear by the top menu Item
button (if menus are configured to disappear). While the totalize measure-
ment is running, the RESET label will stay on screen In the absence of any
other menu. Canceling the totalize measurement will also cancel the RESET
label. The RESET function Is momentary, so the label never gets under-
lined. If another menu is called up then canceled, the RESET label
reappears.
C/T Measurement Menu Page 1
(CTR/TIMER) FREQ RESET
PERIOD
WIDTH
TOTALIZE
FREQ RATIO
(TO GATED MEASMT MENU)
Counter/Timer Menu Totalize Reset Menu
For these measurements, all B trigger modes operate as usual for trig-
gering the C/T. B source LEDs are turned off. The measurement source
channels can be altered In the SET MEAS'MT CHANNEL menu. All B
coupling modes may be used, and B slope may be changed to control which
edge polarity triggers the C/T. The B trigger light remains off during C/T
measurements. However, Indication of proper triggering Is shown with a
steadily blinking “Ct” character in the top line of the readout. If an external
frequency reference source Is plugged Into the rear-panel EXT C/T
REFERENCE INPUT BNC, the “Ct” character will have the “ET” character
above It.
In TOTALIZE, the “Ct” character stays on continuously, and B AUTO
LEVEL MODE only works when measurement Is first selected. After that,
no indication Is given If B trigger Is lost. However, B AUTO LEVEL MODE
may be reselected to acquire a new trigger level.
2247A Operators 3-25