Calibration—475
c. From —15°C to +55°C# from 0.01ms to 50 ms,
accuracy is within 4%.
d. Exclude the following portions of the sweep, from
0.01 Ms to 1 ms:
First 25 nanoseconds and all beyond the 100th
magnified division.
51. Check Delay Time Accuracy
a. Error for intervals less then 1 dial division cannot
exceed 0.01 dial division.
b. Error between any two time markers greater than 1
dial division apart cannot exceed 1%.
52. Check Delay Time Jitter
a. HORIZ DISPLAY to B DLY'D,
A T IM E /D IV to 1 ms,
B TIM E /DIV to 0.2ms.
b. Check for no more than 1 division jitter.
53. Check M IX Sweep Accuracy
a. Use 1 ms time markers.
b. Check for proper timing within 0.24 division.
NOTE
Exclude first 0.5 division of sweep after display start
and first 0.2 division, or 0.1 ps (whichever is greater)
after the transition of A to B.
54. Adjust X Gain
a. A T IM E /D IV to X-Y,
both VOLTS/DIV to 5 mV,
VERT MODE to CH 2.
b. Apply 20 mV square wave from Standard Amplitude
Calibrator to CH 1 or X input.
55. Check X-Y Phasing and Bandwidth
a. Connect an 8 division display of 50 kHz signal from
Medium-Frequency Constant-Amplitude Signal Generator
to the CH 1 and 2 inputs.
b. Check X-Y phase shift is no more than 0.14 division.
c. Increase output frequency of signal generator to
2 MHz.
d. Check X-Y phase shift is no more than 0.42 division.
e. ADJUST—L1103 for minimum phase shift.
f. Check bandwidth is at least 3 MHz.
56. Check B ENDS A Operation
57. Check A TRIG HOLDOFF
Should increase holdoff to nine times the TIM E/DIV
setting.
CALIBRATOR, + GATES, AND
EXT Z-AXIS CALIBRATION
58. Adjust CALIBRATOR Amplitude
a. Short emitter to base of Q1504.
b. Check for +0.3 V DC, within 3 mV, from CALI
BRATOR current loop to ground.
c. ADJUST—R1515 for +0.3 V DC, within 1% from 0°C
to +40°C; for +0.3 V DC, within 1.5% from —15°C to
+55° C.
d. Remove the short from emitter to base of Q1504.
59. Check A and B +GATES
a. A + GATE: +5.5 V P-P, within 0.5 V.
b. B + GATE: +5.5 V P-P, within 0.5 V.
60. Check EXT Z-AXIS Operation
a. Connect 5 V 50 kHz signal to CH 1 input and EXT
Z-AXIS input.
c. ADJUST—X Gain, R1102, for 4 divisions of deflec- b. Check for noticeable intensity modulation of the
tion between the dots, within 3%. positive peaks.
5-22
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