Tektronix 475 - Page 67

b. Use 5 nanosecond time markers and 0.1 Ms triggers.
Calibration—475
b. Use 5 nanosecond time markers and 0.1 Ms triggers.
g. ADJUST—Cl 233 and Cl 253 for 1 time marker/
division.
c. ADJUST—Cl 233 and Cl 253 for 1 cycle/division,
within 2%, from +20°C to +30°C; 1 cycle/division, within
4%, from —15° C to +55° C.
h. A T IM E /D IV to 0.02 ms.
i. Use 2 nanosecond time markers.
d. A TIM E /D IV to 0.02 Ms.
e. Use 2 nanosecond time markers.
j. Set Test Oscilloscope: VOLTS/DIV to 10 mV, T IM E /
DIV to 0 .2 ms.
f. ADJUST—Cl 179 for 1 cycle/division, within 2%,
from +20°C to +30°C; 1 cycle/division, within 4%, from
k. ADJUST—Cl 179 for 1 time marker/division.
—15°C to +55° C.
1. A T IM E /D IV to 0.01 ms.
g. A T IM E /D IV to 0.01 Ms.
m. Set Test Oscilloscope: VO LTS/DIV to 20 mV,
TIM E/D IV to 0.1 Ms.
h. ADJUST—R1075 for 1 cycle/2 divisions, within 2%,
from +20°C to +30°C; 1 cycle/2 divisions, within 4%, from
-1 5 °C to +55° C.
n. ADJUST—R1075 for 1 time marker/2 divisions.
NOTE
o. ADJUST—R1175 and R1185 for flat-top symmetrical
waveform.
If timing cannot be adjusted within 2% from +20°C
to +30°C, or 4% from —75°C to +56°C, proceed to
step 47. If timing is within given tolerance, proceed
to step 48.
48. Check A and B Timing Accuracy
a. From 0.01 ms to 5 ms, at +20°C to +30°C, accuracy is
1%.
47. Adjust High Speed Timing—Current Probe
Method
a. A TIM E /D IV to 0 .05ms,
b. From 10 ms to 0.5 s, at +20°C to +30°C, accuracy is
2%.
X I0 MAG pushed in.
b. Use 5 nanosecond time markers and 0.1 Ms triggers.
c. From —15°C to +55°C, accuracy of all sweep settings
is 3%.
c. Hook the P6022 current probe, with passive termina
tion, around the crossed horizontal deflection leads on the
475. Connect the P6022 to the test oscilloscope.
49. Check A INTEN Timing Accuracy
a. From +20°C to +30°C, from 0.0bps to 0.5 s,
accuracy is within 2%.
d. Set Test Oscilloscope: VOLTS/DIV to 5 mV, T IM E /
DIV to 0 .5 ms, X I0 MAG engaged.
b. From —15°C to +55°C, from 0.0 5ms to 0.5 s,
accuracy is within 3%.
e. ADJUST—R1175 to midrange, R1185 to midrange.
Cl 233 and Cl 253 half-closed, and Cl 179 one turn from
fully clockwise.
50. Check A and B Magnified Timing Accuracy
a. From +20°C to +30°C, from 0.01 Ms to 5 ms,
accuracy is within 2%.
f. ADJUST—R1175 and R1185 for symmetrical wave
form.
b. From +20° C to +30°C, from 10 ms to 50 ms,
accuracy is within 3%.
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