Agilent Technologies 54845B Manual page 50

Chapter 3: Testing Performance
To test offset accuracy
Set the supply voltage to 2.00 V as in the first row of the table. Use the DVM to verify
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the setting.
Re-adjust the vertical position, if necessary, so the trace is as close to the horizontal
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center line of the grid as possible after it has settled (averaging complete).
Read the position voltage. It should be equal to the DVM reading, within the limits given
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in the table. Record the reading in the Performance Test Record.
To find the current position setting, select Channel 1 from the Setup menu and read the Offset
field. Click Close when finished.
Repeat steps 6 through 10 for the other lines in the table.
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With the channel keys, set the active channel OFF and the next ON.
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Move the BNC from one channel to the next.
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Repeat steps 6 through 13 for each channel, setting the parameters of the channel being
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tested where appropriate.
If the test fails
Offset errors can be caused by the need for self-calibration. Perform self-calibration (see chapter 4,
"Calibrating and Adjusting") before troubleshooting the instrument.
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