Operating Instructions
1–8
1503C MTDR User Manual
c.
Distance/Div Is: ft/m. Offers you a choice of how the horizontal scale is
displayed. You may choose from feet per division or meters per division.
When powered up, the instrument will default to feet unless the internal
jumper has been moved to the meters position. Instructions on changing this
default are contained in the 1503C Service Manual.
d. Light Is: On/Off. This control turns the electroluminescent backlight
behind the LCD on or off.
5. Diagnostics Menu lists an extensive selection of diagnostics to test the
operation of the instrument.
NOTE
. The Diagnostics Menu is intended for instrument repair and calibration.
Proper instrument setup is important for correct diagnostics results. Refer to the
1503C Service Manual for more information on diagnostics.
a. Service Diagnostics Menu has these choices:
i.
Sampling Efficiency Diagnostic displays a continuous efficiency
diagnostic of the sampling circuits.
ii. Noise Diagnostic measures the internal RMS noise levels of the
instrument.
iii. Impedance Diagnostic tests the output impedance circuits in the
instrument.
iv. Offset/Gain Diagnostic reports out-of-tolerance steps in the program-
mable gain stage. This can help a service technician to quickly isolate
the cause of waveform distortion problems.
v. RAM/ROM Diagnostics Menu performs tests on the RAM (Random
Access Memory) and the ROM (Read Only Memory).
vi. Timebase Is: Normal - Auto Correction / Diagnostic - No
Correction. When in Normal - Auto Correction, the instrument
compensates for variations in temperature and voltage. This condition
might not be desirable while calibrating the instrument. While in
Diagnostic - No Correction, the circuits will not correct for these
variations.
b. Front Panel Diagnostics aids in testing the front panel.
c.
LCD Diagnostics Menu has these choices:
i.
LCD Alignment Diagnostic generates a dot pattern of every other
pixel on the LCD. These pixels can be alternated to test the LCD.
ii. Response Time Diagnostic generates alternate squares of dark and
light, reversing their order. This tests the response time of the LCD and
Summary of Contents for 1503C
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Page 92: ...Appendix A Specifications A 6 1503C MTDR User Manual...
Page 104: ...Appendis B Operator Performance Checks B 12 1503C MTDR User Manual...
Page 122: ...Glossary Glossary 6 1503C MTDR User Manual...
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