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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

 



Typical performance of auto resistance measurement (4-wire), 2 V range

Range Resolution Test current Current range Total error

(% reading + offset)

  1 A 1 A 

  100 mA 100 mA 

  10 mA 10 mA 

  1 mA 1 mA 

    

    

    

  100 nA 100 nA 

  10 nA 100 nA 

System speeds

Maximum sweep operation reading rates (reading/second) for 50 Hz

Measure speed Measure to

memory

Measure to GPIB Source measure

to memory

Source measure

to GPIB

< 0.001 PLC 20000 12500  12500

0.01 PLC    

0.1 PLC 500  500 

1 PLC    



11 | Keysight | B2900A Series Precision Source/Measure Unit – Data Sheet

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Agilent Technologies B2902 Manuale Utente Pagina 11

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