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P R O B E
C O M P E N S A T I O N
For accurate measurement, the probe should be compen-
sated before starting measurement, as follows:
1)
Connect the probe to the INPUT connector, and adjust
each control for normal s w e e p display.
2)
Connect the probe to the C A L terminal on the front
panel. Adjust the S W E E P T I M E / D I V so that several cy-
cles of the signal from C A L are displayed.
3)
Adjust the probe trimmer to obtain the optimum com-
pensation for the w a v e f o r m on the C R T .
Fig. 2 4
T R A C E R O T A T I O N
Rotation of the trace line from the horizontal graduation line
may cause measurement errors.
Adjust controls for normal s w e e p display. Press the GND
s w i t c h and set the T R I G M O D E s w i t c h to A U T O . Adjust the
T POSITION control s o that the trace overlaps the center
horizontal graduation line. If the trace is tilted, align it with
the horizontal graduation line with the T R A C E R O T A con-
trol on the front panel.
1. DC Voltage Measurement
DC voltage measurement consists of normal procedures and
cursor measurement procedures.
(1) Normal Procedures
The following describes normal procedures for DC lev-
el measurement of w a v e f o r m :
1)
Apply the signal to be measured to the INPUT con-
nector. Select the channel to be used with the V E R -
T I C A L MODE, set the A C - D C to D C , deactivate the
GND s w i t c h , and adjust controls for normal s w e e p
display. T h e n , adjust the V O L T S / D I V and S W E E P
T I M E / D I V to obtain proper w a v e f o r m display. Set
the V A R I A B L E used channel and S W E E P T I M E to
the C A L condition.
2)
Select A U T O of t h e T R I G MODE s w i t c h e s and
press the GND s w i t c h . T h e trace line indicates the
GND level (reference level).
Using the • P O S I T I O N control, adjust the trace
position to the desired reference level. Do not
change this setting once made.
3)
S e t the A C - D C s w i t c h to D C to observe the w a v e -
form including DC component. If the reference level
or V O L T S / D I V setting is inappropriate, waveform
may not be displayed on the C R T . If s o , readjust
the V O L T S / D I V and/or ? POSITION.
26
APPLICATIONS
O p t i m u m
c o m p e n s a t i o n
O v e r -
c o m p e n s a t i o n
I n s u f f i c i e n t
c o m p e n s a t i o n
C O M P E N S A T I O N
4)
Adjust the •< • POSITION to bring the point of the
w a v e f o r m to be measured to the center vertical
graduation line.
5)
Measure the vertical distance between the refer-
ence level and the point to be measured. (The refer-
ence level can be rechecked by pressing the GND
s w i t c h . ) Multiply the distance measured above by
the V O L T S / D I V setting to gain the voltage to be
determined. When the 1 0 : 1 probe is used, also
decuple the voltage. Voltage above and below the
reference level are positive and negative voltages,
respectively.
©
W h e n using P C - 3 1 or direct measurement
DC level = (Vertical distance in divisions) x
( V O L T S / D I V setting)
©
W h e n using 10:1 probe
DC level = (Vertical distance in divisions) x
( V O L T S / D I V setting) X 1 0
M e a s u r e m e n t p o i n t o n c e n t e r
v e r t i c a l g r a d u a t i o n line s e t w i t h
•+ •
P O S I T I O N
G N D l e v e l ( r e f e r e n c e l e v e l ) s e t w i t h
' •< •
Fig. 2 5
[EXAMPLE]
In the example s h o w n in Fig. 2 5 , the measure-
ment point is 3.8 divisions from the reference
GND level. If V O L T S / D I V is 0.2 V , the voltage
to be determined i s :
DC level = 3.8 ( d i v ) x 0 . 2 (V/div) = 0 . 7 6 V
(2) Cursor Measurement Procedures
1)
Make the GND trace displayed according to items
1) and 2 ) of the normal procedures above.
2)
Select a desired cursor mode of AV\ to /1V4 ac-
cording to a channel to be used.
3)
Align the zlREF cursor (reference line) to the GND
trace line.
4)
Set the A C - D C s w i t c h to D C .
5)
Align the /icursor to a point to be measured.
6)
Measured value is displayed following to a cursor
mode display of AVI to AV4.
When the attached probe P C - 3 1 is used, measured value
including the attenuation ratio is displayed. However, if a
probe used is not compatible w i t h the readout function,
measured value is multiplied by the attenuation ratio.
If the ^ c u r s o r is below the AREF cursor, a minus sign ( - )
is displayed to indicate that voltage is negative.
P O S I T I O N
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