Agilent Technologies 35670-90066 manual Service Tests Adjustmts ADC Adjustmnt Offset

Agilent 35670A	Adjusting the Analyzer
	To adjust the ADC gain, offset and reference

•Press the following keys:

[ System Utility ]

[ MORE ]

[ SERVICE TESTS ] [ ADJUSTMTS ]

[ ADC ADJUSTMNT ] [ OFFSET ]

Wait for the analyzer to set up the adjustment. The analyzer is ready when the adjustment message appears on the screen.

•If the oscilloscope display looks like the following figure, go to step 17. The following describes the signals shown on the oscilloscope display:

‘’A’’ A straight, horizontal trace in the upper half of the display. ‘’B’’ A “noisy” flat trace at the center of the sine wave trace. ‘’C’’ A clean sine wave in the lower half of the display.

A

B

C

R431 and R405 Correctly Adjusted

•If trace ‘’B’’ is not flat, adjust A5 R431.

•If trace ‘’C’’ is not centered over trace ‘’B,’’ adjust A5 R405.

•Set the power switch to off ( O ).

•Disconnect the jumper from A5 TP8 and A5 TP300. Reconnect the cable to A5 P4.

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