Specifications

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110 Test Capabilities and System Requirements Appendix A

System Capability

DC Accuracy

Sample

A simplified dc accuracy sample test, shown in Figure A-1, including

numbered “offsets,” is used as an example. Every relay in the measurement

path needs to be included in the algorithm for calculating the system-level

capability. The source voltage of 12.5 volts is supplied by Power Supply #1

through the load card.

The 1-year Accuracy vs. Aperture (±(% of reading + volts)) specification of

the Agilent E1411B DMM for dc voltage on the 64-volt range for 16.7/20

milliseconds is 0.025% + 1.0 millivolt. The relays are all the same part

number and are specified at 30 microvolts offset.

The calculated system capability (accuracy) on the 64-volt range, using

16.7/20 millisecond aperture range, when using the Agilent E1411B within

its defined accuracy conditions is:

DC Accuracy + offset+ offset (DvmHi to Abus4)

+ offset (Series Disconnect Relay)

+ offset (Protection Disconnect Relay)

+ offset (Row 32 Matrix Relay)

+ offset (DvmLo to DUTCommon)

(equals 5 relay offsets of 30 µV each)

Calculated system capability = ±[(0.025% * 12.5 + 1.0 mV) + 5* 30 µV] =

±4.28 mV

System Capability

Driver Saturation

Sample

The output driver transistor saturation sample uses the same setup as the dc

accuracy sample shown in Figure A-1. The only difference is that when the

output driver transistor base voltage is biased to force saturation, the

collector voltage is expected to be 0.4. Therefore the Agilent E1411B DMM

voltage range will be changed to the 1 volt range.

The calculated system capability (accuracy) on the 1-volt range, using