Tektronix 310A, Instruction Manual, Page: 73 / 132

Performance Check/Calibration—Type 310A
between the second and tenth vertical lines of the graticule.
The marker at the tenth vertical line must be within 0.4
division (within 5%) of the line when the marker at the
second vertical line is positioned exactly.
f. ADJUST—C250 (see Fig. 5-18) for one marker each
division (use low-capacitance screwdriver). The markers at
the second and tenth vertical lines must coincide exactly
with their respective graticule lines (reposition the display
with the H O R IZO N TAL POSITION control if necessary).
36. Check Normal Sweep Timing Accuracy
CAUTION
To prevent burning of the CRT phosphor at slow
sweep rates, position the baseline of the marker dis­
play below the viewing area.
a. Change the following control settings
TRIGGER + INT
Horizontal Display X I MAG
b. CHECK-Using the T IM E /D IV switch and time-mark
generator settings given in Table 5-4, check normal sweep
timing within 0.24 division (within 3%) over the center
eight divisions of the display. Set the TRIG LEVEL control
as necessary for a stable display.
TABLE 5-4
Normal Sweep Timing Accuracy
T IM E /D IV switch
Time mark CRT display
setting generator output (markers/division)
11 M' T 1
0.5 microsecond 1
1 C 1 microsecond 1
2 pSEC 1 microsecond 2
5 pSEC 5 microsecond 1
10/
j
SEC 10 microsecond 1
20 pSEC 10 microsecond
2
bOpSEC 50 microsecond 1
.1 MSEC 0.1 millisecond 1
.2 MSEC 0.1 millisecond 2
.5 MSEC 0.5 millisecond 1
1 MSEC 1 millisecond 1
2 MSEC 1 millisecond
2
5 MSEC 5 millisecond 1
10 MSEC
10 millisecond 1
20 MSEC 10 millisecond
2
50 MSEC 50 millisecond
1
.1 SEC
0.1 second
1
.2 SEC
0.1 second
2
37. Check Magnified Sweep Timing Accuracy
a. Change the following control settings:
TRIGGER + EXT
Horizontal Display X5 MAG
b. Set the time-mark generator for one-microsecond
trigger output.
®
Fig. 5 -1 8 . Lo cation o f high-fraquancy adjustm ents (la ft sida).
c. Connect the time-mark generator trigger output con­
nector to the EXT TRIG INPUT binding post with the
18-inch BNC-to banana plug patch cord.
d. CHECK-Using the T IM E /D IV switch and time-mark
generator settings given in Table 5-5, check magnified
sweep timing within the given tolerances over the center
eight divisions of the total magnified sweep length. Set the
TRIG LEVEL control as nocessary for a stable display and
set the TRIGGER switch for + INT source as given in Table
5-5.
e. Disconnect all test equipment.
TABLE 5-5
Magnified Sweep Timing Accuracy
T IM E /D IV
switch
setting
Time-mark
generator
output
CRT display
(markers/
division)
Allowable
error for
given
accuracy
,5pSEC
.1 microsecond 1
0.4/livision
(within 5%)
IpSEC .1 microsecond
2
0.32 division
(within 4%)
0
2pSEC .1 microsecond 4
Set TRIGG R switch to + 1NT
bpSEC 1 microsecond 1
lOjtSEC
1 microsecond
~ T ~
20 pSEd 1 microsecond 4
50/uSEC 10 microsecond 1
1
MSEC
10 microsecond
2
.2 MSEC
10 microsecond 4
.5 MSEC
.1 millisecond
1
1 MSEC
.1 millisecond
2
2 MSEC
.1 millisecond 4
5 MSEC
1 millisecond
1
10 MSEC
1 millisecond 2
20 MSEC
1 millisecond 4
50 MSEC
10 millisecond 1
.1 SEC
10 millisecond
2
.2 SEC
10 millisecond 4
5-23