Measuring Instruction; Probe Phase Adjustment - Goldstar OS-7020 Service Manual

The frequency of calibration may be extended to 6 months,
if the oscilloscope is used infrequently.
6. MEASURING INSTRUCTION
6-1 Probe phase Adjustment
Proper adjustment of the probe phasing is required before
measurements as the incorrect phasing results in eroneous
measurements when the
XLO
position is selected.
1.
Set the controls as follows
VOLTS/DIV
VARIABLE
TIME/DIV
(sweep)VARIABLE
O.lV
CAL
o.sms
CAL
(Horizontal)POSITION CENTER
2. Set the probe switch to x10 and connect the probe between
the input connector and the CAL
OUT
terminal.
3. Display the calibration voltage waveform with 5 divisions
amplitude
4.
Adjust the variable capacitor of the probe using the
small driver, and set the top of the waveform to the
correct phasing shown in Fig. 6-1
I
I
I
I
I
I
--- ~-- ~-- ~--
___
. . . __
-- -- --- --
I
I
I
I
:
I
\. . \. .
\. \.
\.. I
.
I
I
'
I
I
·-
- - --
-
-
__
, .
__
--
-
-·
--· ---
'
'
I
,
r
y
r r
'
'
I
I
r
r
r!
r r
I
'
.
-
-
~-- . -
--
--t--
-- ---
--
--
I
\. . \.
~
""
\. .
I
I
I
correct
OVER -Shoot
UNDER - Shoot
Fig 6-1. Phasing of probe
&
Waveform
11