HP 8559A manual (in

PERFORMANCETESTS

PERFORMANCE TESTS

4-26. DISPLAY FIDELITY (Cont'd)

		TABLE4-16. AMPLITUDELOG DISPLAY ACCURACY
			Corrected			Theoretical
Attenuator	DVM			Theoretical	Reading Subtracted
			DVM
Setting	Reading			Reading	From Corrected
			Reading*
(dB)	(mV)			(mV)	DVM Reading
			(mV)
						(mV)
0			+800 (Ref.)
10
20
30
40
50
60
70

I *DVM Reading minus offset recorded in step 2.

MODEL 8559A

Difference

Between

Adjacent

Readings

(mV)

EXAMPLETABLEOF 4-16

		Corrected		Theoretical	Difference
Attenuator	DV M		Theoretical	Reading Subtracted	Between
		DVM
Setting	Reading		Reading	From Corrected	Adjacent
		Reading*
(dB)	(mV)		(mV)	DVM Reading	Readings
		(mV)
				(mV)	(mV)

*DVM Reading minus offset recorded in step 2.

8.After recording DVM readings for step attenuator settings from 0 dB through 70 dB, calculate each Corrected DVM Reading by algebraically subtracting offset recorded in step 2. Record results in Table 4-16 (see sample computations).

9.Algebraically subtract corresponding Theoretical Reading from each Corrected DVM Reading, recording results in Table 4-16. Maximum value should not exceed +15 mV, corresponding to +1.5 dB. Divide maximum value by 10 to calculate Log Maximum Cumulative Error (in dB).

dB Log Maximum Cumulative Error