Agilent Technologies 54835A, 45A, 46A To test voltage measurement accuracy, Connect the equipment

Chapter 3: Testing Performance

To test voltage measurement accuracy

To test voltage measurement accuracy

This test verifies the voltage measurement accuracy of the instrument. The measurement is made using dual-cursor automatic measurement so that offset errors are not a factor.

A power supply provides a reference voltage to check voltage measurement accuracy. The actual supply voltage is monitored for accuracy using a NIST-traceable voltmeter. A dc blocking capacitor and a BNC short are used to filter any noise generated by the power supply (especially at low voltages) so it does not appear at the oscilloscope input.

Specification

Only the dual-cursor specification is tested.

Single Cursor Measurement: ±(gain accuracy + offset accuracy + resolution/2)

Dual Cursor Measurement: ±(gain accuracy + resolution)

Gain Accuracy: ± 1.00% of full scale at full-resolution channel scale

Resolution: 8 bits, (0.4% of full scale without averaging); or

12 bits, (0.024% of full scale with 32 averages) at ful-resolution scale Offset Accuracy: ±(1.00% of channel offset + 1% of full scale) at full-resolution scale

Equipment Required

Equipment	Critical Specifications	Recommended Model/Part
Power Supply	7 mV to 30 Vdc, 0.1 mV resolution	Agilent 6114A
Digital Multimeter	Better than 0.1% accuracy	Agilent 34401A
(DVM)
Cables (2)	BNC	Agilent 10503A
Adapters (2)	BNC (f) to banana (m)	Agilent 1251-2277
Adapters (2)	BNC tee (m)(f)(f)	Agilent 1250-0781
Blocking capacitor	0.18 ∝F	Agilent 10240B
Shorting cap	BNC	Agilent 1250-0774

Procedure

1Connect the equipment.

See figure 3-4.

a Use a BNC-to-banana adapter to connect a BNC cable to the power supply.

b Connect a BNC tee to the other end of the cable and connect the tee to channel 1 of the oscilloscope.

c Connect another BNC cable to the tee at the oscilloscope and connect a BNC tee to the other end of the cable.

d Connect the blocking capacitor to the BNC tee and connect the BNC short to the blocking capacitor.

e Connect a BNC-to-banana adapter to the same BNC tee and connect the adapter to the DVM input.

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