Tektronix 475 Technical Manual

TM 11-6625-2735-14-1
c. Set CH 1 VOLTS/DIV to maintain a convenient
display amplitude and set A TRIGGER LEVEL for a stable
display. (It may be necessary to adjust A TRIGGER
HOLDOFF for best triggered display through this step).
d. CHECK—TIME/DIV settings
from 0.01 to
0.05 division for accuracy, at first and 11th graticule
lines, within 2%, from + 20°C to +30°C; within 4%, from
–15°C to +55°C.
e. CHECK—That accuracy is within 5% (0.1 division)
over any 2 division interval at ail TIME/DIV settings (see
following note).
NOTE
If waveform has modulation, check 2 division ac-
curacy between adjacent time marks of equal
amplitude.
Turn INTENSITY full on, note the start of sweep and
exclude the first 25 nanoseconds from start of
sweep or first 2 major unblanked divisions at normal
intensity (whichever is greater) and all beyond the
100th division.
f. Remove the trigger cable setup from A TRIGGER
external input, set A TRIGGER SOURCE to NORM and set
A TRIGGER COUPLING to AC. Remove the
500 megahertz filter.
g. Set TIME/DIV to 0.1 set time-mark generator for
10 nanosecond time marks and set CH 1 VOLTS/DIV to
maintain a convenient display amplitude.
h. CHECK—TIME/DIV settings from 0.1 to
5 ins/division for accuracy, at first and 11th graticule lines,
within 2%, from +20°C to +30°C, within 4%, from –15°C
to +55°C.
26. Check Differential Delay Time Accuracy
a. Set HORIZ DISPLAY to B DLY’D and set TIME/DIV
to 0.05 Pull and unlock DLY’D SW Pknob, set to 0.01
and set X10 MAG to off.
b. Set time-mark generator for 50 nanosecond time
marks.
c. Turn DELAY TIME POSITION to 1.000. Adjust horiz-
ontal POSITION to set time mark at center graticule line.
d. Turn DELAY TIME POSITION clockwise until adja-
cent time mark is at center graticule line and note dial
reading.
e. CHECK—For a difference in dial reading of 1.000
0.010, from +15°C to +35°C; +0.0020 from -15°C to +55°C.
f. Turn DELAY TIME POSITION to set every adjacent
time-mark to coincide with graticule center and note
reading.
g. CHECK—Each reading between any 2 adjacent
time-marks for 1.000, within 0.010, from +15°C to +35°C;
within 0.020, from –15°C to +55°C. Also, check the
difference between any time marks separated by more
than 1 major dial division not to exceed maximum error as
listed in Table 5-3.
TABLE 5-3
Differential Delay Time Accuracy
Difference
Maximum
Maximum
in Major
Error Error
Dial Divisions
+15°C to +35°C
15°C to +55°C
1.000
+0.010
+0.020
2.000 +0.019 +0.029
3.000
+0.027 +0.042
4.000 +0.033 +0.053
5.000
+0.039
+0.064
6.000
+0.043
+0.073
7.000
+0.047
+0.082
8.000
+0.049 +0.089
9.000 +0.050 +0.095
h. CHECK—Display time accuracy as directed in part
g, at all settings listed in Table 5-4 not to exceed maximum
error listed in Table 5-3.
5-17

Tektronix 475 Specifications

General

Brand	Tektronix
Model	475
Category	Test Equipment
Language	English