175A - HP Archive
175A - HP Archive
175A - HP Archive
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Section V<br />
Table 5-9 (Cont'd)<br />
15. Trigger<br />
Sensitivity<br />
16. Trigger<br />
Symmetry<br />
Table 5-9. Condensed Adjustment Procedure (Cont'd)<br />
Ext Equip<br />
Test Procedure<br />
Adjust<br />
Required<br />
Calibration<br />
Generator<br />
Calibration<br />
Gene rator<br />
17. Sweep Length Square Wave<br />
Generator<br />
a. SWEEP MODE.. . . . PRESET<br />
TRIGGER SLOPE . . . . . . .<br />
(-)<br />
SWEEP TIME.. . 1 MSEC/CM<br />
SENSITIVITY. . . 0.05 V/CM<br />
b. Apply .05 vrms to TRIG<br />
INPUT (EXTAC)<br />
c. Connect probe to case of CR102<br />
d. Center Trigger Symmetry<br />
R116; Trigger Sensitivity RlZOfully<br />
cw (or ccw in some instruments).<br />
a. Complete step 15.<br />
b. Set TRIGGER SLOPE TO (+).<br />
c. Briefly ground grn/orn wire<br />
on SLOPE switch.<br />
Display 1 Mc squarewave at<br />
1 MSEC/CM.<br />
18. Sweep Time Sweep Time Markers Adjustment<br />
Time Mark<br />
Generator<br />
19. Vertical Gain Vertical Test<br />
Adapter; Calibra-<br />
tion Generator<br />
20. Scan Response Test Plug; Square<br />
Wave Generator;<br />
Test Oscilloscope<br />
21. Scan Balance Test Plug; Square<br />
Wave Generator;<br />
Test Oscilloscope<br />
Z2. Pulse Response Vertical Response<br />
Tester<br />
!3. High Frequency<br />
Response<br />
Vertical Response<br />
Tester<br />
!4. Calibrator Calibration<br />
Generator<br />
.I @EC/CM 10 Mc<br />
.2 @EC/CM 5 Mc<br />
.5 @EC/CM 1 psec<br />
1 @EC/CM 1 pec<br />
io @EC/CM 10 wec<br />
.I MSEC/CM 100 psec<br />
1 MSEC/CM 1 msec<br />
io MSEC/CM 10 msec<br />
.I SEC/CM 100 msec<br />
Apply lv p-p through Test Adapter<br />
to vertical amplifier<br />
Display 6 cm of 50 kc square wave,<br />
then install Test 'Plug (Figure 5-1),<br />
Trigger Test Oscilloscope on<br />
square wave.<br />
Complete step 20. Increase<br />
square wave frequency to 1 Mc.<br />
Observepositive pulse step at<br />
0.5 @EC/CM.<br />
Complete step 22. Increase<br />
SWEEP TIME to 0.1 @EC/CM.<br />
a. Generator output 1Ov p-p<br />
SENSITIVITY 1 V/CM.<br />
b. Reduce vertical deflection to<br />
exactly 6 cm with VERNIER.<br />
Model <strong>175A</strong><br />
a. Rotate TRIGGER LEVEL<br />
for free-running display.<br />
b. Trigger Sensitivity R120<br />
(with TRIGGER LEVEL) for<br />
stable, symmetrical square<br />
wave.<br />
c. If necessary, rotate R120<br />
ccw to prevent solid trig-<br />
gering on .03 vrms input.<br />
Trigger Symmetry R116<br />
for symmetrical square<br />
wave.<br />
Sweep Length R161 for 11<br />
cm of sweep<br />
C125<br />
C1016<br />
C1014<br />
c1012<br />
ClOlO<br />
R1005<br />
R1004<br />
R1003<br />
R1002<br />
Gain R45 for 5 cm deflection<br />
a. Scan Response C36 for<br />
best square wave observed<br />
at pin 15 of 5105;<br />
b. Scan Response C37 for<br />
best square wave at pin 13.<br />
Scan Balance C33 for bal-<br />
anced waveform observed at<br />
pin 10 of Test Plug. (Replace<br />
horizontal plug-in).<br />
a. Mid Freq. Response C22<br />
to drop leading corner 0.2 cm.<br />
b. Low Freq. Response C35<br />
for flat pulse top.<br />
c.Mid Freq. Response C22<br />
for best pulse response.<br />
Hi Freq. Response L7 and<br />
L8 for best high frequency<br />
corner. (Replace vertical<br />
plug-in).<br />
a. Connect CALIBRATOR<br />
10VOLToutput to INPUT.<br />
b. Cal Volt Adj R375 for<br />
exactly 6 cm deflection.<br />
5-20 01526-2
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