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A-8 Specifications Model 2790 SourceMeter

Switch System User’s Manual

Ohms speciﬁcation calculations (7751/7752/7753)

Ohms speciﬁcations for the 7751/7752/7753 module provide the ohms accuracy and tem-

perature coefﬁcient data for speciﬁc I-source and V-source output values. The following

formulas can be used to determine the ohms speciﬁcation for any valid I-source or V-source

output setting not published in the speciﬁcation sheet.

Ohms accuracy and temperature coefﬁcient are speciﬁed as percent of reading plus an

ohms offset.

7751/7752/7753 I-source

Low ohms speciﬁcations using the I-source of the 7751/7752/7753 are provided for the

following current output settings: 50mA, 20mA, 10mA, and 1mA (dry circuit ohms). Use

the following formulas for other I-source settings:

NOTE The following formulas are only valid when using 1VDC range of the

Model 2790 DMM. When using the SIxOhms math calculation, the 1V range is

selected automatically.

Ohms accuracy

% of reading = (0.07 + 1/I

SOURCE

) %

Ohms offset = (0.03/I

SOURCE

) Ω

where; I

SOURCE

is the current output setting in mA

Example – Determine ohms accuracy for an I-source setting of 30mA:

% of reading = (0.07 + 1/30) %

= (0.07 + 0.03) %

= 0.10%

Ohms offset = (0.03/30) Ω

= 1mΩ

Ohms accuracy (30mA) = 0.10% + 1mΩ

Keithley 2790 User Manual

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