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Read the dial setting w h e n B s w e e p points of
• D E L A Y T I M E M U L T ® and ® are in
the s a m e position.
Fig. 3 0
[ E X A M P L E ]
For the example s h o w n in Fig. 3 0 , the first dial reading is
0.76 and the second is 6.22 with the A S W E E P T I M E / D I V
set at 2
us.
W e have, substituting the appropriate values
Pulse repetition time = ( 6 . 2 2 - 0 . 7 6 ) x 2 (/us) = 1 0 . 9 2 /us
U S I N G D E L A Y E D S W E E P F O R
O F R S S E T S M E S A N D F A L L T 1 M E S
Risetimes and falltimes are generally measured by using
the 1 0 % and 9 0 % amplitude points a s reference starting
and ending points for the rise or fall.
1. Apply the signal to INPUT jack and s e t the vertical
M O D E s w i t c h to the channel to be used.
Use the V 0 L T S / D I V and V A R I A B L E controls to obtain a
normal 6 division high w a v e f o r m display.
Using the y P O S I T I O N control, set the waveform posi-
tion in the central area of the screen vertically, that it to
coincide w i t h the 1 0 0 % and 0 % lines on the C R T
screen.
S e t the S W E E P T I M E / D I V to a s high a speed a s p o s s i -
ble consistent with observation of both the 1 0 % and
9 0 % points.
S e t the A V A R I A B L E control to C A L .
2. Pull out the B S L O P E s w i t c h to initiate the S T A R T S
A F T E R D E L A Y mode of operation and adjust the B
S W E E P T I M E / D I V control for a s short a s possible an i n -
tensified section of waveform.
3. Using the D E L A Y T I M E M U L T control, adjust the w a v e -
form s u c h that the 1 0 % point is intensified and record
the dial reading.
4 . Similarly, using the D E L A Y T I M E M U L T control adjust
the 9 0 % point s o that it is intensified and record that
dial reading a s well.
T h e pulse risetime (or falltime) is simply the difference
between the t w o dial settings times the A S W E E P
T I M E / D I V control setting.
Using the formula:
Risetime = (2nd dial reading - 1 s t dail reading) x Delayed
s w e e p time (A S W E E P T I M E / D I V setting)
2 8
A P P L I C A T I O N
[ E X A M P L E ]
For the example s h o w n in Fig. 3 1 , the first dial reading is
1.20 ( 1 0 % point) and the second is 7 . 3 8 ( 9 0 % point) with
the A S W E E P T I M E / D I V setting set at 2 /us.
Substituting the given value:
Risetime = ( 7 . 3 8 - 1 . 2 0 ) x 2 (^s) = 1 2 . 3 6 /JS
MEASUREMENT
TIME DIFFERENCE MEASUREMENTS
USING DELAYED S W E E P
Synchronized w a v e f o r m s w h i c h are s k e w e d in time can be
accurately measured using the delayed sweep.
1. Apply the t w o signals to the channel 1 and channel 2
2. S e t the S O U R C E s w i t c h to the signal that is leading in
3. Pull out the B S L O P E s w i t c h to initiate the S T A R T S
4. Select the HORIZ D I S P L A Y s w i t c h to A L T and use the
5. Using the D E L A Y T I M E M U L T control adjust the pulse
6. Using the D E L A Y T I M E M U L T control adjust the corre-
Rise time
Fig. 31
INPUT jacks, setting the vertical
D U A L and selecting either A L T or CHOP display.
phase and adjust the V O L T S / D I V and S W E E P T I M E /
DIV controls for easy waveform observation.
Set the A V A R I A B L E control to CAL.
A F T E R D E L A Y mode of operation. Select the HORIZ
D I S P L A Y s w i t c h to A - I N T - B and adjust the B S W E E P
T I M E / D I V and D E L A Y T I M E M U L T controls to make the
intensified portion coincide with the rising edge or fall-
ing edge of the w a v e f o r m that is to be used a s the r e -
ference.
Y T R A C E S E P control to adjust the B s w e e p for easy
observation.
to any convenient vertical graduation line and record
the dial reading at that point.
sponding point on the second signal to the s a m e verti-
cal line and record the reading of the dial at this point as
well. T h e time difference or s k e w of the t w o w a v e -
forms is then the second dial reading minus the first
dial reading multiplied by the A S W E E P T I M E / D I V c o n -
trol setting.
MODE s w i t c h to
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