HP Car 3490A manual Perfohmancechecks, RATI0PEBF0BMANCE0ption 080, $38. DC/DCRatioAccuracyTests

Model3490A PERFOHMANCECHECKS Section V

FUNTION GENERATOR	OSCILLOSCOPEPLI.JGIN PLUG IN
hp 3310A/B	h p l S O D	h p l 8 0 l A h p l 8 2 l A

OELAYEDGATEOUTPUI

TOSAMPLE/HOLD

ACTRIGGERINPUT

Figure$7. Sample/HoldResponseTest.

g.Set oscilloscopemain sweepto .5 ms/div.

h.Adjust function generator frequency to 200H2, output level to 2 V peak-to-peak.

i.Set 349OARANGE to I V.

j.Adjust intensified trace to approximately I ms after the negative-going edge of square wave. Note reading,which should be near zero.

k.Adjust intensified trace to approximately 500 ps after the negative-goingedge of square wave. Reading shouldbe within t 0.001 V of readingnoted in stepj.

536. RATI0PEBF0BMANCE(0ption

080).

5-37. The dc and ac voltage measurementperformance

of the 3490A must be within specifications before proceeding with the ratio performance tests. Refer to Paragraphs5-9 and 5-l l.

$38. DC/DCRatioAccuracyTests.

5-39. Preferred Method. Two dc standards(-hp- 7a0B) are necessary for this method, making it possible to check performance at variouslevelsof EXT REF voltage and INPUT voltage. Both dc standardsmust be floating,

since IMUT Low and EXT REF Low terminals are connectedinternally. If only one dc standardis availa- ble, go to Paragraph540.

a. Set 3490A RATIO switch to EXT REF I V. Connect a dc standardto 3490A INPUT terminalsand adjuststandardoutput to + 0.10000V.

b.Set 349OA FUNCTION to DC, RANGE to 1 V. Connect a seconddc standardto 3490A IMUT termi_ nalsand adjust standardoutput to + g.lgggg V. 3490A displayshouldbe + 0.99955to + 1.00045.

c.Select EXT REF and INPUT rangesand voltages listed in Table 5-7. Display should be within limits shovmin eachcase.

540.Alternate Method. A dc standard(-hp- 74OB)and a secondvoltagesourcehavingan output of l0 V + 5 %, stable to within I mV/hr, are required for this method. Both the dc standardand the secondvoltagesourcemust

be floating. A 9.8 V mercurybattery (Mallory TN77) is

.e satisfaQtorysource. The following procedurewill refer

"to the secgndvoltagesourceasthe battery.

a.Set 34904 RATIO switch to INT REF. FUNC_ TION to DC, RANGE to 10 V.

Table5-7. DC/DC Ratio AccuracyTest.

Ext Ref	Ext Ref	Input	Input	Display Limits
Range	Voltage	Range	Voltage

1	V	+ 0.10000v	1	V	+	0.10000v	+ 0.99955to + 1.00045
1	V	'+
		0.50000v	1	V	+	0.50000v	+ 0.99979to + 1.00021
1	V	+ 1.00000v	1	V	+	1.00000v	+ 0.99982to + 1.00018
1	V	+ 1.00000v	1	V	-	1.00000v	- 0 . 99982to - 1 . 00018
1	V	- 1.00000v	1	V	-	1.00000v	+ 0.99982to + 1.00otg
1	V	- 1.00000v	1	V	+	1.00000v	- 0 . 999821o -1 . 00018
1	V	+ 1.20000v	1	V	+	1.00000v	+ 0.83316to + 0.83350
1 0 v		+ 1.00000v	1 0 v		+	1.00000v	+ 09.9955to + 10.0045
1 0 v		+ 5.00000v	1 0 v		+	5.00000v	+ 09.9979to + 10.0021
1 0 v		+ 10.0000v	100v		+ 100.000 v		+ 099.979to + 100.021
1 0 v		+ 12.0000v	100v		+ 100.000 v		+ 083.313 to + 083.353

5-7