Tektronix 475 User Manual

NOTE
C l253 may need to be dosed more than C l233 to
make the top o f the waveform flatter on the 2 ns
range.
l. Set the A TIM E /D IV switch to 0.02 jus and select 2 ns
time marks from the Time-Mark Generator.
m. Set the Test Oscilloscope TIM E/D IV switch to
0.2 jus, and the VOLTS/DIV switch to 10 mV.
n. ADJUST—Cl 179 (see Fig. 5-27) for 1 time marker/
division.
o. CHECK—Test Oscilloscope for a current waveform
approximately 40 mA in amplitude.
p. Set the 475 A T IM E /D IV switch to 0.01 jus.
q. Set the Test Oscilloscope TIM E /D IV switch to 0.1 jus,
and the VOLTS/DIV switch to 20 mV.
r. ADJUST—R1075 for 1 time marker/2 divisions.
s. CHECK—Test Oscilloscope for a current waveform
approximately 80 mA in amplitude.
t. ADJUST—R117.5 and R1185 for asymmetrical wave
form with a flat top.
NOTE
Q1234 affects the flatness o f the top o f the waveform
and should be changed if it is difficult to obtain a
flat-top waveform.
111 11 II 1 11 11 11 if 111 r
"ill!
iL i
1111
1111 IIIL
|MI. 111 r
Fig. 5-30. Typical CRT display with high-speed timing adjustments
preset.
Calibration—475
v. CHECK—Timing error at 2 ns and 5 ns ranges.
NOTE
If 2 ns timing is long and 5 ns timing is short,
decrease C l 179 and increase C1233 and/or C1253.
w. INTERACTION—R1175 and R1185 should be
readjusted for best symmetry and flatness on the 1 ns and
2 ns ranges if Cl 179, Cl 233, Cl 253, or R1075 is re
adjusted.
x. Remove the current probe, being sure not to spread
the CRT horizontal deflection leads.
73. Check TIM E/D IV Accuracy
a. CHECK—Using the A TIM E /D IV switch and the
Time-Mark Generator settings given in Table 5-7, check that
A SWEEP timing is within the given tolerance.
TABLE 5-7
Timing Accuracy
A TIM E /
DIV
Switch
Setting
Time-
Mark
Generator
Output
CRT
Display
(markers/
division)
Accuracy
+20° C to
+30° C
—15° C to
+55° C
0.01 ns 10 ns
1
1% 3%
0.02 jus
10 ns
2
1%
3%
0.05 jus
50 ns
1
1%
3%
0.1 jus
0.1 jus
1
1%
3%
0.2 jus 0.1 jus
2
1%
3%
0.5 jus
0.5 jus
1
1%
3%
1 jus
1 JUS
1
1%
3%
2 jus
1 JUS
2
1%
3%
5 jus
5jus
1
1% 3%
IO jus 10 jus
1
1% 3%
20 jus IOjus
2
1%
3%
50 jus
50 jus
1
1% 3%
0.1 ms
0.1 ms
1
1%
3%
0.2 ms
0.1 ms
2
1%
3%
0.5 ms
0.5 ms
1
1% 3%
1 ms
1 ms
1 1%
3%
2 ms
1 ms
2
1% 3%
5 ms
5 ms
1
1% 3%
10 ms
10 ms 1
2%
3%
20 ms
10 ms
2
2% 3%
50 ms
50 ms
1
2% 3%
0.1 s
0.1 s
1
2% 3%
0.2 s
0.1 s
2
2% 3%
0.5 s
0.5 s
1
2% 3%
®
5-55

Tektronix 475 Specifications

General

Brand	Tektronix
Model	475
Category	Test Equipment
Language	English