Performance CheckICalibration-7070 (SN B205000 and Up)
27.
Check
Sweep Holdoff Time
a. Install the 7B70 (on the rigid extender to allow probe
access to TP566) i n the B Horizontal Plug-In Compartment.
Change the control settings a s follows:
7870
TRIGGERING
MODE
P-P AUTO
COUPLING
AC
SOURCE
INT
DISPLAY MODE
TIME BASE
TIMEIDIV
.02
p s
MAGNIFIER
X 1
Test Time Base2
(Installed in the A Horizontal
Plug-In Compartment)
Level /Slope
Centered on Positive
Slope
Triggering
Mode
Norm
Coupling
AC
Source
Int
B Delay Mode
Independent
Magnifier
X 1
TimeIDiv
.5 p s
Position
Midrange
Variable TimeIDiv
Cal In
Oscilloscope
Vertical Mode
Left
Horizontal Mode
A
A Trigger Source
Left Vert
B Trigger Source
Right Vert
A Intensity
Adjust for viewable trace
b. Connect a 10X probe from the 7A16A to TP566
(near R785, left side, lower rear) on the 7B70 Time Base
board.
c. CHECK-The
holdoff time (see Fig. 5-10) corre-
sponds to the values given in Table 5-9.
Fig.
5-10. CRT
display when checking sweep holdoff time.
TABLE 5-9
7B70
1
7871
1
HOLDOFF
TIMEIDIV
TIMEIDIV
(Equal or less than)
5 s
2 s
.15
s
'lf
a
test time base other than the
7871
is used, refer t o the instruc-
tion manual for the time base being used for appropriate control
settings.
This completes the calibration of the 7B70 Time Base.
5 ms
10 rns
20 rns
Scans by ArtekMedia O 2006
10 ms
20 ms
7.5 ms
15 ms
50ms
i
30 ms
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