Operator Performance Checks
2–6
1502C MTDR Service Manual
10. Exit from Noise Diagnostics, but do not exit from the Service Diagnostic Menu
yet.
If the instrument fails this check, it should not be used for loss or impedance
measurements. Send it to be serviced when possible.
1. In the Service Diagnostic Menu, select the Offset/Gain Diagnostic and follow
the directions on the display.
NOTE. Occasionally, the instrument might not pass the 48 dB step. This is no cause
for alarm. If the remainder of the steps do not fail, proceed as normal. Refer to the
1502C Service Manual for additional information.
There are three screens of data presented in this diagnostic. The Pass/Fail level is
3% for any single gain setting tested.
2. Exit from Offset/Gain Diagnostic, but do not leave the Service Diagnostic
Menu yet.
If the instrument fails this check, the waveforms might not look normal. If the
efficiency is more than 100%, the waveforms will appear noisy. If the efficiency is
below the lower limit, the waveform will take longer (more pixels) to move from
the bottom to the top of the reflected pulse. This smoothing effect might completely
hide some faults that would normally only be one or two pixels wide on the display.
1. In the Service Diagnostic Menu, select Sampling Efficiency and follow the
directions on the screen.
2. When done with the test, press the MENU button repeatedly until the instrument
returns to normal operation.
If the aberrations are out of specification, the ohms-at-cursor function might be less
accurate than specified.
1. Connect the 50
W
precision terminator to the front-panel CABLE connector.
2. Set the DIST/DIV control to 5 ft/div (1 m/div).
3. Increase the VERT SCALE control to 50 m
r
/div.
4. Using the
n
o
POSITION control, move the top of the pulse to the center graticule
line.
4. Offset/Gain Check
5. Sampling Efficiency
Check
6. Aberrations Check
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