Calibration Procedure—
465B Service
Performance
Check
Table
4-4
A AND B TIMING
ACCURACY
3. Check
Delay or Differential Time Linearity
a. Set:
A
and B
CRT Display
TIME/DIV
Time-Mark (Markers/
Switch Setting
Generator Output Division)
0.02 jus
20 ns
1
1
0.05 (US
50
ns 1
.1 /JS .1
/JS
1
.2
/JS .2
/js
1
.5 fJS
.5
/JS
1
1 f
JS 1
/JS
1
2
/JS 2
/.IS 1
5
/js 5
(US
1
10
(US 10
/JS
1
20
/js
20
(US
1
50
(US 50
/JS 1
.1 ms .1 ms
1
.2 ms .2
ms
1
.5 ms .5
ms
1
1
ms 1
ms 1
2
ms 2
ms
1
5 ms
5 ms
1
10 ms
b
10 ms 1
20 ms"
20 ms 1
50 ms”
50 ms
1
A
SWEEP ONLY
.1 s
b
.1 S
1
.2
s
b
.2 S 1
.5 S
b
.5 s 1
‘
If the
time-mark
generator
used does
not have
a
1-2-5
sequence,
set to 1 or 2
time-markers/division as
necessary.
A TIME/DIV
B
TIME/DIV
HORIZ DISPLAY
B TRIGGER SOURCE
1 ms
5 fjs
B DLY’D
STARTS
AFTER
DELAY
b. Select 1 ms time
markers from the time-mark
generator.
c. Turn DELAY TIME
POSITION
to
set time marker
nearest 1.00 on
dial
to coincide with graticule center and
note reading.
d. Turn
DELAY TIME POSITION to set time marker
nearest 2.00 on dial to coincide with
graticule center and
note reading.
e.
CHECK—
Difference
in readings is 1.00 ±0.01 (0.99
to
1.01),
from
+15°C
to +35°C; ±0.03 (0.97
to
1.03),
from
—
15°C to + 55° C.
f. Turn DELAY TIME
POSITION dial to set every
adjacent time
marker
to
coincide with graticule center and
note reading.
g.
CHECK—Difference of readings between
any Iwo
adjacent time markers is 1.00, ±0.01 (0.99 to
1.01),
from
+15°C
to +55°
C;
±0.03 (0.97 to
1.03),
from -15°C
to
+55°
C.
b
For sweep time greater than 5 ms/div
set TRIG MODE
to NORM.
2.
Check
A
VAR TIME/DIV
Range
a. Set:
HORIZ DISPLAY A
A TRIG MODE AUTO
TIME/DIV 2
ms
4. Check Delay or
Differential Time
Accuracy
a. Set:
HORIZ DISPLAY B
DLY’D
A
TIME/DIV 0.2 /js
B
TIME/DIV 0.05 /js
b. Select 5 ms
time markers from the
time-mark gen-
erator.
c.
CHECK—At least
1
marker per division
can
be
obtained by adjusting
the VAR TIME/DIV control.
d. Return
the VAR TIME/DIV
control
to
the detent
position.
b.
Set the A
TIME/DIV,
B
TIME/DIV and
thetime-mark
generator
to
the settings
given
in
Table
4-5.
First set the
DELAY TIME
POSITION dial
to 1.00.
Adjustthc
horizontal
POSITION control so the top of one of
the displayed time
markers
crosses the
center vertical graticule line. (If the
top of
the time marker at the
beginning of the sweep isn’t
visible, then use the
second time marker.)
Without
touching the horizontal
POSITION control, set the DELAY
TIME POSITION dial to 9.00.
Slightly readjust the DELAY
TIME
POSITION dial
to
position the
top
of the
displayed
time marker
to
the center
vertical graticule line.
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