Philips PM32671 Service Manual page 93

5-22
5.5.7.4. Delayed time-base time coefficients
-
Set the controls as indicated in fig. 4.1.
- Depress A of
-
Set the DELAY TIME control R3 to 0.
-
Set the MTB TIME/DIV switch S15 to 2 p .
-
Set the DTB TIME/DIV switch S13 to
-
time-marker signal, pulse repetition rate Ip, to input X2 (A).
Apply a
- Depress DTB of S2.
- Check that the centre
- Set the MTB TIME/DIV switch to 0.2ms.
- Set the DTB TIME/DIV switch to O.lms.
- Apply a time-marker signal, pulse repetition rate
- Check that the centr
- Check the other positions of the DTB TIME/DIV switch
position slower than the DTB TIME/DIV switch) using the appropriate input signals, tolerances
-
1 subdiv.).
- Set the MTB TIME/DIV switch
- Set the DTB TIME/DIV switch
- Apply a time-marker signal, pulse repetition rate
- Check that the control range of the continuous control R9 lies between
- Check that the UNCAL LED B4 lights up when the continuous control R9 is not in the CAL position.
- Set the continuous control R9 in CAL position.
- Remove the input signal.
5.7.5. Delay time multiplier
- Depress MTB of S2.
-
Depress MTB of S22.
- Set the DELAY TIME control
- Set the start of the trace exactly on the first vertical graticule line by means of the X
- Set the MTB TIME/DIV switch
-
Set the DTB TIME/DIV switch (S13) to 0 . l p .
-
time-marker signal, pulse repetition rate 0.1 ms to input A.
Apply a
- Check that the intensified part on the trace coincides with the starting point of the second time-marker
pulse if necessary readjust R268 (fig. 5.1 ).
-
Set the DELAY TIME control to 9.0.
- Check that the intensified part on the trace coincides with the starting point of the tenth time-marker
pulse; if necessary readjust R262 (fig. 5.1
- Both adjustments are a
both conditions are fulfilled.
- Set the DELAY TIME control R 3 to
Checking the delay time jitter
-
Set the MTB TIME/DIV switch
- Set the DTB TIME/DIV switch
- Apply a sine-wave signal, frequency
- Set the trace height to 6 div.
- Set the DELAY TIME control to 9.0.
- Depress DTB of S2.
-
Check that the jitter of the DTB trace is
NOTE: Remove the 1.8Ma resistor again.
5.5.8. X Deflection
Connect the instrument to
-
- Depress B and EXT (LINE) of
- Check that the trace width
8 cycles have a total width
of
0.1 ms, to input A.
8
cycles have a total width of
S15 to 5 p .
S13 to lp.
R 3 to 1.0.
.).
little bit interdependent,
so the procedure described above must be repeated until
0.
S15 to
Ims.
S13 to 0.5p.
1 MHz to input X2 (A).
1 div.
mains voltage with a mains frequency of 50
a
S23.
is 8 div; if necessary readjust R891 (fig. 5.2.).
8 div; if necessary readjust R349 (fig. 5.1
8 div; if necessary readjust R351 (fig. 5.1
S13 (keep the MTB TIME/DIV switch S15 one
1 :2,6 and 1 :3.
60 Hz.
or
.).
.).
+
or - 3%
POS control R5.