Keithley 2790 - Page 124

Model 2790 SourceMeter
®
Switch System User’s Manual Specifications A-11
For measurements 100MΩΩ
ΩΩ
to 1GΩΩ
ΩΩ
Ohms accuracy
% of reading = (2 + 510/V
SOURCE
) %
Ohms offset = 20kΩΩ
ΩΩ
where; V
SOURCE
is the voltage output setting in volts
Example – Determine ohms accuracy for a V-source setting of 100V:
% of reading = (2 + 510/100) %
= (2 + 5.1) %
= 7.1%
Ohms accuracy (100V) = 7.1% + 20kΩ
Ohms temperature coefficient
TC % of reading = (0.02 + 51/V
SOURCE
) % / °C
TC ohms offset = 200ΩΩ
ΩΩ
/ °C
where; V
SOURCE
is the voltage output setting in volts
Example – Determine temperature coefficient for a V-source setting of 100V:
% of reading = (0.02 + 51/100) % / °C
= (0.02 + 0.51) % / °C
= 0.53% / °C
Ohms temperature coefficient (100V) = (0.53% + 200Ω) / °C