Tektronix 2236 User Manual

Operating Procedures -- 2236 Operators
n
13. Adjust both
B DELAY TIME
POSITION and
A TIME
POSITION controls until the points of interest on the two B
traces intersect at any convenient vertical graticule line .
Read the time difference on the readout .
nal , all consecutive periods that fall within the B Sweep du
ration will be included in the gated measurement . In
frequency
mode the CTM
will
display the
reciprocal of
the
average
of all
periods
within the
blinking
intensified
zone
. In
period mode the CTM will display the arithmetic average of
all periods within
the blinking
intensified zone
.
14. Adjust the B TRIGGER LEVEL control counterclock
wise to
midrange
position to
trigger at the
desired
threshold
of the waveform . Read the time difference on the readout .
n
m
Phase Difference
In gated width mode , the intensified zone will cover one
pulse width on
the input signal
, if the B
Sweep
duration is
less than that width . If the B Sweep duration covers more
than one pulse
width , then the
CTM will display
the
arithmetic average
of all the pulse
widths inside
the blinking
intensified zone . Gated width does not display the “ no b
trig
"
status
message .
The phase difference between two signals of equal fre
quency
is
determined
in manner
similar
to
that
described
in the
preceding
procedure for
measuring time
difference be
tween two time - related pulses . To measure the phase differ
ence between two time - related signals , use the following
procedure
:
1
n
1. Perform steps 1 through 14 of the preceding " Time
Difference Between Two Time - Related Pulses " procedure .
The
accuracy in
gated frequency
,
period , and
width
mea
surements
improves
as the
number of
samples
within the
gate interval increases . It is advantageous to lengthen the
intensified zone to include as many trigger events as possi
ble within the gating interval .
2. Record the time difference on the readout .
In gated
totalize mode
, one event
is
counted for each
period of input
signal inside the
intensified zone
( the stop
trigger
edge is
not
counted
) .
3. Set the A & B INT switch to CH 1 and A SOURCE
switch to INT .
The following procedure describes how gated measure
ments are accomplished .
4. Select A HORIZONTAL MODE and set UPPER
FUNCTIONS - LOWER FUNCTIONS switch to IN and press
in the
PER
button
.
1. Preset
instrument
controls and obtain
a
baseline
trace .
5. Read the period of the two signals on the readout , and
calculate the phase difference using the following formula :
2. Apply the
signal to either
vertical
-
channel input con
nector and set the VERTICAL MODE switch to display the
channel used .
Phase Difference
time
difference
360
x
period
-
Gated
Measurements
3. Adjust the A
TRIGGER LEVEL
control to obtain
a sta
ble
display
.
Gated measurements of frequency , period , width , and to
talize are performed through the B Trigger circuitry . When
the B Sweep is properly triggered , the intensified zone dura
tion indicates the gate interval over which the CTM samples
the displayed
waveform
, rather than
the
duration of B
Sweep . The intensified zone blinks at the measurement cy
cle rate ( except when in totalize mode ) to indicate that the B
Sweep is
triggered ,
and that
the CTM
is receiving
the B
Trigger
signal
.
4. Set the A SEC / DIV switch to a position that displays
the point of interest within the graticule area .
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1
n 7
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5. Select ALT HORIZONTAL MODE , set B TRIGGER
LEVEL control to fully clockwise position and adjust both
the
appropriate
vertical channel
POSITION
control and
A / B
SWP SEP control to display the A trace above the B trace .
n
In
gated frequency
and period
mode
, the
intensified
zone
will completely cover one period of the input signal ( two con
secutive trigger edges ) if the B Sweep duration is less than
that period . The CTM extends the intensified zone to cover
this interval when the B Sweep is triggered . If the B Sweep
duration is actually longer than one period of the input sig
6. Set the B
SEC / DIV switch
to the desired
sweep
speed and
adjust
the B
DELAY
TIME POSITION
control to
move the intensified zone to that portion of the display to be
measured .
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Tektronix 2236 Specifications

General

Brand	Tektronix
Model	2236
Category	Test Equipment
Language	English