Performance Tests
4-24
TDS 420A, TDS 430A & TDS 460A Service Manual
H Press MEASURE.
H Press the main-menu button Select Measurement for CHx; then
press the side-menu button Mean. (You will have to press MORE
several times to access the Mean measurement.)
H Set the vertical SCALE to 100 mV.
H Press the VERTICAL MENU button and then the Offset main-
menu button. Set the offset to 0 V.
H Set the vertical POSITION to0V.
2. Confirm input channels are within limits for DC delta voltage accuracy: Do
the following substeps — test CH 1 first, skipping substep a since CH 1 is
already selected from step 1.
a. Select an unchecked channel:
H Set the generator output to 0 V.
H Press WAVEFORM OFF to remove the channel just confirmed
from the display.
H Press the front-panel button that corresponds to the next channel you
are to confirm.
H Press MEASURE.
H Press the main-menu button Select Measurement for CHx; then
press the side-menu button Mean. (You will have to press MORE
several times to access the Mean measurement.)
H Move the test hook up to the channel you select.
H Set the vertical SCALE to 100 mV.
H Set the vertical POSITION to0V.
H Press the VERTICAL MENU button and then the Offset main-
menu button. Set the offset to 0 V.
b. Set the generator: Set the DC calibration generator to +0.35 V.
c. Record Measur ement: Read the mean at the measurement readout, and
record this number on a piece of scratch paper.
d. Set the generator: Set the DC calibration generator to --0.35 V.
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