--
HORIZONTAL ACCURACY CHECK
A check
of
the horizontal timing
can
be
made using the
time measurement capability of the CURSOR measure-
ment mode:
1.
Preset instrument controls
and
obtain a baseline
trace as described
in
"Initial Setup".
2.
Set:
CH
1 AC-GND-DC
STORE/NON STORE
A SEC/DIV
PRETRIG/POST TRIG
POSITION CURS/
SELECT WAVEFORM
GND
STORE (button
in)
1
ms
POST TRIG (button out)
POSITION CURS (button
in)
3.
Turn the Horizontal POSITION control to align the
start of the trace to the first vertical graticule line.
4.
Turn the Vertical POSITION control to align the
baseline trace with the center horizontal graticule line.
5.
Position the active cursor to the second vertical
graticule line using the CURSORS Position control.
6.
Push the SELECT C1/C2 switch to activate the
other cursor.
7.
Position the active cursor to the tenth vertical grati-
cule line using the CURSORS Position control for a spac-
ing of eight divisions between cursors.
8.
Check that the Delta Time readout
is
~
7.84
ms
and
~
8.16 ms.
9.
Verify that the
CH
1 probe tip
is
in
the PRB
ADJ
connector.
10. Set the
CH
1 AC-GND-DC switch to
DC.
Operator's Checks and Adjustments-2230 Operators
11. Adjust the SEC/DIV switch setting for a display of
at least one full period of the probe adjust signal
(0.1
or
0.2
ms
per division).
12. Use the Vertical
and
Horizontal POSITION controls
to
center the display.
13. Use the CURSORS Position control
and
the CUR-
SORS SELECT
C1
/C2 button to align the cursors with the
rising edges of the PRB
ADJ
signal (measurement
is
of
the
probe adjust signal period). Note the cursor time difference
readout
and
the graticule measurement (horizontal dis-
tance between rising edges
as
taken from the graticule
markings) of the signal for later reference.
14. Check that the cursor readout
of
the probe adjust
signal period
and
the graticule measurement of the calibra-
tor period are within ± 2%.
15. Set the STORE/NON STORE switch to the
NON
STORE position (button out).
16.
Determine the horizontal graticule measurement of
the probe adjust signal period. Note the reading for later
reference.
17. Check that the
NON
STORE Mode probe adjust
signal period measurement obtained from the graticule
markings
is
within ± 3% of the STORE Mode probe adjust
signal period obtained
in
step 13.
18. Set the X10 MAG switch to
on
(pull Var Sec/Div
knob out)
and
set the A SEC/DIV switch setting to obtain
a display of at least one full period of the probe adjust sig-
nal
(0.1
or 0.2
ms
per division).
19. Check that the magnified
NON
STORE Mode probe
adjust sugnal period measurement obtained from the grati-
cule markings
is
within
±4%
of the STORE Mode probe
adjust signal period obtained
in
step
13.
5-3
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