Agilent Technologies 54835A, 45A, 46A manual To Set Vertical Scale and Position

Chapter 3: Testing Performance

To test voltage measurement accuracy

Figure 3-7

Set the scale from the table

Set the offset from the table

Vertical Scaling and Offset for Voltage Accuracy Measurement

To Set Vertical Scale and Position

You can also use the knobs to set the vertical scale and position, but it is usually easier to use the dialog box, particularly for the fine position setting.

11With the supply disconnected from the channel input, note the Vavg mean reading.

____________ V

It may take a moment for this value to settle because of averaging.

12Set the power supply voltage from the first line of the table. Use the voltmeter to adjust the power supply for the most accurate output.

13Connect the power supply to the channel input and note the Vavg reading. _________ V

Press Clear Display and wait a moment to read the value (so that averaging is complete).

14Subtract the value in step 11 from the value in step 13. Record the difference in the Performance Test Record.

15On the same channel, repeat steps 10 through 14 for the rest of the rows in the table.

16With the channel keys, set the active channel OFF and the next ON.

A channel is ON if its key is illuminated and OFF if it is not illuminated.

17Move the BNC tee to the next channel and repeat steps 8 through 15 for that channel.

18Repeat steps 8 through 17 for the rest of the channels.

19Repeat steps 3 through 18 for the 50Ω input.

If the test fails

Voltage measurement errors can be caused by the need for self-calibration. Before troubleshooting the instrument, perform self-calibration. See “To run the self-calibration” in chapter 4, “Calibrating and Adjusting.” If self-calibration fails to correct the problem, the cause may be the attenuator or main assembly.

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