Calibration Procedure—
465B
Service
Adjustment Procedure
16. Check Delay or Differential Time
Accuracy
a. Set:
B
TRIGGER SOURCE
A TRIG MODE
TIME/DIV (both)
HORIZ DISPLAY
STARTS AFTER
DELAY
AUTO
According to
Table
4-17
ALT
NOTE
Below
5
ms/division ALT HORIZ
DISPLAY sweeps
alternate too slowly to observe display with ease
;
therefore, set HORIZ DISPLAY TO
B DLY'D. If in
doubt
as
to the correct setting of
the DELA Y TIME
POSITION
dial, set the HORIZ DISPLAY switch to A
INTEN
and check which marker is intensified.
b. CHECK—Using the A TIME/DIV switch,
B TIME/
DIV switch, and the time-mark
generator settings given in
Table 4-17,
check
differential
time accuracy is within the
given
tolerance.
First set the DELAY TIME POSITION dial
to 1.00 and rotate
the
dial
slightly
until the sweep starts
at
the top of the second time marker. Note the control setting
and then set the dial to 9.00 and rotate
it
slightly until
the
sweep starts at the top of the tenth time marker. Delay
TIME POSITION dial setting
must be 8.00
divisions higher,
±0.08 division.
Table
4-17
DIFFERENTIAL
TIME ACCURACY
A Time/ B
Time/ Time- Allowable
Div Div
mark Error
for
Switch Switch Generator
Given
Setting Setting Output Accuracy
0.1
us
0.02
us
0.1
us
0.2
us
0.05
us
0.2
us
0.5
us
0.05
us
0.5
us
1 us
0.1
us 1 us
2 us
0.2
us 2 us
5 us
0.5
US 5 us
10 us 1 us
10
us
20 us 2 us
20
us
50
us 5 us 50 us
0.1 ms
10 us
0.1 ms ±8 minor
0.2 ms
20
us
0.2 ms
dial
divisions
0.5 ms 50
us
0.5 ms
1
ms 0.1 ms
1
ms
2 ms
0.2
ms 2
ms
5 ms
0.5
ms 5
ms
10 ms* 1 ms 10 ms
20 ms" 2 ms 20 ms
50 ms‘ 5 ms 50 ms
0.1 s‘ 10
ms
0.1 s
0.2 s* 20 ms 0.2 s
0.5 s* 50 ms 0.5 s
‘Below 5
ms/division, set HORIZ DISPLAY to B DLY'D and
A TRIG MODE to
NORM.
17. Check Delay or Differential Time Jitter
a. Set:
DELAY TIME POSITION 1.00
HORIZ DISPLAY B DLY'D
A TIME/DIV 1ms
B TIME/DIV
0.2 ps
A
TRIG MODE AUTO
b.
Select
1 ms
time
markers from time-mark gen-
erator.
c.
Position
the time marker near the center of the
display area with
the
DELAY
TIME POSITION dial.
d. CHECK
—
Jitter
on the leading edge of
the
time
marker should not exceed
i
division
(2.5
divisions if
the
instrument
is being operated on a 50 Hz line
voltage).
Disregard the slow drift.
e. Turn the DELAY TIME POSITION dial to 9.00 and
slightly readjust so the time marker is displayed near the
center
of the
display
area.
f. CHECK—Jitter on the leading edge
of the time
marker should not exceed 1 division (2.5 divisions if the
instrument is being operated on a 50 Hz line voltage).
Disregard the slow drift.
g.
Disconnect test setup.
18. Check/Adjust X Gain (R4381)
a. Set:
TIME/DIV
(both) X-Y
VOLTS/DIV (both) 5 mV
CH 1 AC-GND-DC AC
CH
2 AC-GND-DC GND
HORIZ DISPLAY
A
A TRIGGER SOURCE NORM
@
4-58
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