Keithley 2790 User Manual

Model 2790 SourceMeter
®
Switch System User’s Manual Specifications A-9
Ohms temperature coefficient
TC % of reading = (0.001 + 0.025/I
SOURCE
) % / °C
TC ohms offset = (0.001/I
SOURCE
) Ω / °C
where; I
SOURCE
is the current output setting in mA
Example – Determine temperature coefficient for an I-source setting of 30mA:
% of reading = (0.001 + 0.025/30) % / °C
= (0.001 + 0.00083) %
= 0.00183% / °C
Ohms offset = (0.001/30) Ω / °C
= 0.033mΩ / °C
Ohms temperature coefficient (30mA) = (0.00183% + 0.033mΩ) / ºC
7751/7753 V-source
High ohms specifications using the V-source of the 7751/7753 are provided for the 500V
and 50V settings. Use the following formulas for other V-source settings:
For measurements 1MΩΩ
ΩΩ
to 10MΩΩ
ΩΩ
Ohms accuracy
% of reading = (1.1 + 15/V
SOURCE
) %
Ohms offset = 20kΩ
where; V
SOURCE
is the voltage output setting in volts
Example – Determine ohms accuracy for a V-source setting of 100V:
% of reading = (1.1 + 15/100) %
= (1.1 + 0.15) %
= 1.25%
Ohms accuracy (100V) = 1.25% + 20kΩ

Keithley 2790 Specifications

General

Brand	Keithley
Model	2790
Category	Switch
Language	English