Index To Performance Check And Adjustment Procedure; Preliminary Procedure; Triggering System; Switch - Tektronix 7B87 Instruction Manual

Performance Check and Adjustment-7B87
INDEX TO PERFORMANCE CHECK
AND ADJUSTMENT PROCEDURE
PAGE
A. TRIGGERING SYSTEM
1. Adjust DC Balance and Slope Balance
(R85,R80) ..................................... 5-5
.,/ 2. Check Triggering Modes .................... 5-5
.,/ 3. Check External Level Range ................ 5-6
4. Adjust Trigger Sensitivity (R49) ............. 5-6
.,/ 5. Check External Triggering Sensitivity ........ 5-6
.,/ 6. Check Internal Triggering Sensitivity ........ 5-7
.,/ 7. Check Internal Trigger Jitter ................ 5-9
.,/ 8. Check Line Triggering ...................... 5-9
B. HORIZONTAL/ AQS SYSTEM
1. Set Basic Sweep Calibration ............... 5-10
.,/ 2. Check Sweep Length and Positioning
Range ....................................... 5-10
.,/ 3. Check/Adjust Magnifier Gain and
Registration (R430,R445) ..................... 5-11
.,/ 4. Check Variable Time/Division and Variable
Hold Off ..................................... 5-11
5. Adjust 50 ns Sweep Timing (C330) ....... 5-11
.,/ 6. Check Internal Clock Frequency Ranges ... 5-11
.,/ 7. Check External Clock Input ................ 5-12
8. Adjust Delay Start and Pickoff Bias
(R305,R530) .................................. 5-12
9. Adjust DVM Zero and Scaling
(R550,R538) .................................. 5-12
10. Adjust 10 I1S and 10 ms Sweep Timing
(R71 0,R715) .................................. 5-13
.,/ 11. Check Delay Time Accuracy .............. 5-13
.,/ 12. Check Sweep Timing ..................... 5-14
.,/ 13. Check Magnified Sweep Timing .......... 5-14
.,/ 14. Check Special Readout Encoding ......... 5-15
./ Performance Requirement check; see introductory information.
5-4
PRELIMINARY PROCEDURE
1. Install a 7A 16A Amplifier unit in the left vertical
compartment, and a 7A 19 Amplifier unit in the right
vertical compartment of the oscilloscope mainframe.
2. Install the 067-0580-00 plug-in extender in the B
horizontal compartment of the mainframe. Remove the
side covers and install the 7B87 in the plug-in extender.
3. Set the mainframe vertical mode switch to display the
left vertical unit and the horizontal mode switch to
display the B horizonal unit. Set the mainframe intensity
controls fully counterclockwise and set the trigger source
switches to vertical mode.
4. Turn on the mainframe and allow at least 20 minutes
warmup before beginning the procedure .
NOTE
The performance of this instrument can be
checked at any ambient temperature within
the 0 0 to +50
0
C range unless stated
otherwise. This instrument must be adjusted
at an ambient temperature of +20
0
to +30
0
C
for quoted accuracy.
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