Agilent Technologies B2902 Manuel d'utilisateur télécharger pdf (Page 11)

Resistance Measurement

Resistance measurement can be performed under either auto or manual test

conditions. Auto resistance measurement is performed in current source and

voltage measurement mode. The total auto resistance measurement error is

shown in the table below. The total error of a manual resistance measurement

can be calculated using the voltage and current accuracy information as shown

below.

Source I mode, manual ohm measurement (4-wire):

Total error = Vmeas/Isrc = R reading x (gain error % of V range + gain error

% of I range + offset error of I range / Isrc value %) + (offset error of V

range / Isrc value)

Source V mode, manual ohm measurement (4-wire):

Total error = Vsrc/Imeas = 1/ [1/R reading x (gain error % of I range + gain

error % of V range + offset error of V range / Vsrc value %) + (offset error of

I range / Vsrc value)]

Measurement speed = 1 PLC

Applicable for temperature: 23 °C ± 5 °C

Example of total error calculation:

I Source value = 1 mA at 1 mA range

V measure range = 2 V range

Total error (% reading + offset) = (0.02 % + 0.02 % + 200 nA/1 mA) + (350

μV/1 mA) = 0.06 % + 0.35 Ω

Typical Performance of Auto Resistance Measurement (4-wire), 2 V range

Range Resolution Test Current

Current

Range

Total Error

(% reading + offset)

2 Ω 1 μΩ 1 A 1 A 0.2 % + 0.00035 Ω

20 Ω 10 μΩ 100 mA 100 mA 0.06 % + 0.0035 Ω

200 Ω 100 μΩ 10 mA 10 mA 0.065 % + 0.035 Ω

2 kΩ 1 mΩ 1 mA 1 mA 0.06 % + 0.35 Ω

20 kΩ 10 mΩ 100 μA 100 μA 0.065 % + 3.5 Ω

200 kΩ 100 mΩ 10 μA 10 μA 0.06 % + 35 Ω

2 MΩ 1 Ω 1 μA 1 μA 0.095 % + 350 Ω

20 MΩ 10 Ω 100 nA 100 nA 0.18 % + 3.5 kΩ

200 MΩ 100 Ω 10 nA 100 nA 1.08 % + 35 kΩ

Measure

Speed

Measure To

Memory

Measure To

GPIB

Source Measure

To Memory

Source Measure

To GPIB

< 0.001 PLC 20000 12500 19500 12500

0.01 PLC 4500 3950 4500 3950

0.1 PLC 500 490 500 490

1 PLC 49 49 49 49

Operation reading rate varies by number of sweep steps. Number of sweep steps is specified from 1 to 2500.

System Speeds

Maximum Sweep Operation Reading Rates (reading/second) for 50 Hz

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 34 35

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Agilent Technologies B2902 Manuel d'utilisateur Page 11

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