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Chapter 4: Testing Performance

Offset Accuracy Test

Change the channel 1 offset value to -60.0 mV (or -2 V for the 1 MW version of this test).

20 Set the DC supply voltage to -60.0 mV (or -2 V for the 1 MW version of this test).

21 Press the Clear Display key on the scope, wait for the #Avgs value (top left corner of screen)

to return to 256 and then record the DMM voltage reading as V

DMM-

and the scope Vavg

reading as V

Scope-

in the Offset Accuracy Test section of the Performance Test Record (either

the 50 W or 1 MW version of the table depending on which version of the test you are using).

Fill in the V

error-

column by using the following equation:

error-

= V

DMM-

- V

scope-

error-

must be within the limits specified by the corresponding Offset Accuracy Limit listed

in the table.

22 Repeat steps 15 to 20 for the remaining channel 1 vertical sensitivities in the Offset Accuracy

Test section of the Performance Test Record (either the 50 W or 1 MW version of the table

depending on which version of the test you are performing). For each measurement, set both

the DC supply voltage (External Supply Setting) and the Channel offset voltage to the positive

External Supply Setting value and then to the negative External Supply Setting value in the

"External Supply Setting" column of the Offset Accuracy Test section in the Performance Test

Record for each of the vertical sensitivities.

23 Move the Tee connector to the next channel input and repeat steps 15 to 22 for the channels 2

to 4.

24 Repeat steps 12 through 22 for the 1 MW channel input impedance setting. This means you

should follow the directions exactly as stated except in step 15(c) you will select the 1 MW

radio button instead of the 50 W one and all values will be entered in the Offset Accuracy Test

(1 MW) section of the Performance Test Record rather than the Offset Accuracy Test (50 W)

section. You will also want to be sure to use the external supply settings and offset values from

the 1 MW version of the Offset Accuracy Test table as they are different than the 50 W version.

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Agilent Technologies Ininiium 9000 Especificaciones Pagina 58