Tektronix DC 5010 Instruction Manual page 26

Operating Instructions-DC 501 0
PERIOD A. Measures and displays the period of the
Channel A signal.
L'
WIDTH A,, Measures the width of a pulse on Channel A.
When CHANNEL A SLOPE is
+,
the positive pulse width is
measured. When CHANNEL A SLOPE is negative, the neg-
ative pulse width is measured.
TlME A t. B. Measures the time between the first occur-
rence of an event on Channel A and the first succeeding
event on Channel B.
RISEIFALL A (Risetime A
-
Falltime A). Automatically
measures the risetimelfalltime (10% and 9O0/0) of the signal
appearing on CHANNEL A. The appropriate trigger levels
are measured and calculated at the time the button is
pressed. If the signal amplitude changes, the button may be
pressed agai~n. When CHANNEL A SLOPE is
+,
risetime is
measured; for falltime, press CHANNEL A SLOPE
=
(-)
before pressing RISEIFALL A. Since this measurement
uses the B channel, its settings are automatically updated to
match those of CHANNEL A. After pressing RISEIFALL A,
the user is free to modify either CHANNEL A or CHANNEL
B separately to suit special measurement needs, though the
result may no longer be a traditional RiseIFall time. (See
Risetime A and Falltime A later in this section).
RATIO BIA. Measures and displays the ratio of events
occurring on Channel B divided by the events occurring on
Channel A over the same time interval.
The three totalize modes of operation count the events
that are the occurrences of pulses on Channel A and B.
TOTAL A, (Totalized A). In Total A, only Channel A
events are displayed.
TOTAL A+B. Displays the total number of events on
Channel A plus the total number of events on Channel B.
Channel B events are counted only after the first valid Chan-
nel A event.
TOTAL A.-B. Displays the total number of events on
Channel A minus the total number of events on Channel B.
Channel B events are counted only after the first valid Chan-
nel A event. If A-B is negative, a minus sign is lighted.
NOTE
After a TOTALIZE button is pushed, the
\
STA RT/STOP button lights to indicate a "STOPped"
condition. It must then be pressed to stat? the Totalize
process.
Also, the number of digits displayed is "scaled" by the
AVGS setting. This scaling does not affect the actual
count process, and therefore may be changed while
counting without losing counts. Even when counting
has been stopped, the display may be moved to the
right or left.
PROBE COMP. When in this mode, a visual indication is
given (in the display area) that allows the user to easily com-
pensate attached high impedance probes. (See Probe Com-
pensation in this section.)
TlME MAN (Time Manual). Measures time after pressing
the MEASUREMENT STARTISTOP pushbutton (once to
start and once to stop). The accumulated count (time) is not
reset until the RESET pushbutton is depressed. Like the
Totalize modes, this function defaults to the STOPped state
when first selected, as indicated by the STARTISTOP but-
ton being illuminated.
EVENTS B DUR A (Events B During A). Measures the
number of occurrences of pulses on Channel B during the
time interval where the Channel A input signal is greater
than (+ SLOPE) or less than (- SLOPE) the Channel A
trigger level.
@
LEVEL CH A, CH B
Displays the chosen trigger level. Trigger level settings
may be set for either channel by depressing the appropriate
LEVEL button and then using the increment or decrement
buttons (labeled 10). To exit this mode, the user can press
the LEVEL A (B) button a
second time or press any function
button.
@
AVGS (Averages)
Pressing this button displays the current AVGS setting
and readies the instrument for a new setting. The user can
then choose between several modes.
AUTO
-
(push the AUTO button, a
-
1 will be displayed).
This mode provides the best resolution possible with a mea-
surement time of approximately 300 mS.
0
-
(decrement exponent to zero). The selected measure-
ment is made with at least one event. This is the mode to be
used for single-shot measurements. At most frequencies,
more than one event will actually be averaged; see the
Specification section for further detail.
REV OCT 1981