Tektronix 7B70 Time Base Instruction Manual page 64

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