Adjustment Procedure-2225 Service
c. Position the first time marker to the center ver- c. CHECK-That the spacing between time
tical graticule line using the Horizontal POSITION markers is two divisions or less.
controls.
d. Return the SECIDIV Variable knob to the CAL
d. Set the Horizontal MAG to
X10.
detent.
e. ADJUST-X50 Mag Reg
(R730) to bring the first
time marker to the center vertical graticule line.
f. Set the Horizontal MAG to
XI.
g. ADJUST-XI0 Mag Reg (R782) to overlay the
first time marker to the center vertical graticule line.
7. Adjust 10-ps and 5-ps timing
(R722, C703)
a. Set the SECIDIV switch to 10 ps.
b. Select 10-ps time markers from the time-mark
generator.
c. ADJUST-1 0-ps Timing
(R722) for one marker
per division.
4. Check Sweep Length
d.
Set the SECIDIV switch to 5 ps.
a. SET:
SECIDIV
Horizontal MODE
b. Select
.l
-ms time markers from the time-mark
generator.
c. Position the start of the sweep at the first ver-
tical graticule line using the Horizontal POSITION
control.
d. CHECK-That the sweep length is between 10.2
and 12 divisions.
5.
Check Position Range
a. CHECK-That the start of the sweep can be
positioned to the right of the center vertical graticule
line by rotating the COARSE Horizontal POSITION
control fully clockwise.
b. CHECK-That the tenth time marker can be
positioned to the left of the center vertical graticule
line by rotating the COARSE Horizontal POSITION con-
trol fully counterclockwise.
c. CHECK-That the
FINE Horizontal POSITION
control can move the trace more than 0.4 divisions.
6.
Check Variable Range
e. Select
5-ps time markers from the time-mark
generator.
f. ADJUST-5-1s Timing
(C703) for one marker
per division.
8.
Adjust High-Speed Timing (C784, C794)
a. SET:
CH 1
VOLTSIDIV 0.1 V
CH 1 AC-GND-DC AC
SECIDIV 0.05 ~s
Horizontal MODE MAG
Horizontal MAG
XI 0
Trigger SOURCE EXT, EXT
b. Select 10-ns time markers from the time-mark
generator.
c. Connect the time-mark generator trigger out-
put via a
504 BNC coaxial cable and a 504 BNC
termination to the EXT INPUT
OR
Z input connector.
d. Adjust the Trigger LEVEL control so that the
markers are stably triggered.
e. ADJUST-5-ns Linearity
(C784) and 5-13s
Timing (C794) for two divisions between each
marker.
9. Check Timing Accuracy and Linearity
a. Select 0.5-ms time markers from the time-
a. SET:
mark generator.
CH VOLTSIDIV
b. Set the
SECIDIV Variable control knob fully
SECIDIV
counterclockwise Horizontal MODE
5-1 4
REV
APR
1990
Scam
by
ARTEK
MEDL4
*
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