Tektronix 455, Instruction Manual, Page: 50 / 246

Performance Check—455/A 2/B 2
TABLE 3-3 (continued)
A and B Timing Accuracy
A and B
T IM E /D IV
Switch Setting
Time-Mark
Generator
Output
.5 ms 0.5 ms
1 ms
1 ms
2 ms
2 ms
5 ms 5 ms
*10 ms 10 ms
*20 ms
20 ms
*50 ms 50 ms
A SWEEP ONLY
*.1 s 0.1 s
*.2 s 0.2 s
*.5 s 0.5 s
* Set T R IG M ODE switch to N O RM .
22. M AG NIFIED SWEEP ACCURACY
a. Set generator fo r 10 ns time marks.
b. Set: A SOURCE EXT
A TRIG MODE AUTO
A and B TIME/DIV 0.5 /tS
X I 0 MAG in (on)
c. CHECK—B T IM E /D IV magnified accuracy according
to Table 3-4. One tim e mark/division w ithin 3% (w ith­
in 0.3 div at 11th graticule line) except at .05 /us
B T IM E /D IV setting which should be 1 time m ark/2 div.
Exclude portions o f sweep as indicated in Table 3-4.
d. Set HORIZ DISPLAY to A.
e. CHECK—A T IM E /D IV magnified accuracy according
to Table 3-4. One time mark/division w ithin 3% (within
0.3 div at 11th graticule line) except at .05 jiis A T IM E /
D IV setting which should be 1 time mark/2 div. Exclude
portions of sweep as indicated in Table 3-4.
23. D IFFER EN TIA L TIM E MEASUREMENT ACCURACY
a. Set generator for 0.1 /us time marks.
TABLE 3-4
A and B Magnified Accuracy
A and B
T IM E /D IV
Switch Setting
Time-Mark
Generator
Output
Portions of Total
Magnified Sweep
Length to Exclude
From Measurement
.05 /us
10 ns
First and last 8 divisions
.1
/US
10 ns
First and last 4 divisions
.2 /us 20 ns
First and last 2 divisions
. 5 /us 50 ns
1 /us 0.1 /us
2 /us 0.2 /us
5 /us 0.5 /us
10 /us
1 /us
20 /us 2 /us
50 /us 5 /us
.1 ms 1 0 /us
.2 ms 2 0 /us
.5 ms 50 /us
1 ms 0.1 ms
2 ms 0.2 ms
5 ms 0.5 ms
10 ms 1 ms
20 ms 2 ms
50 ms 5 ms
A SWEEP O N LY
*.1 s 10 ms
*.2 s 20 ms
*.5 s 50 ms
* Change T R IG M O DE switch to NO RM .
b. Set: HORIZ DISPLAY
A SOURCE
B SOURCE
A TIME/DIV
B TIME/DIV
DELAY TIME POS
X I 0 MAG
B DLY’D
NORM
STARTS AFTER
DELAY
.2
ns
.05 tis
1.00
out (off)
c. Position 1st displayed marker to graticule vertical
centerline w ith horizontal POSITION.
REV FEB 1983
3-11