Keithley 2790 - Page 123

A-10 Specifications Model 2790 SourceMeter
®
Switch System User’s Manual
Ohms temperature coefficient
TC % of reading = (0.02 + 1/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 + 1/100) % / °C
= (0.02 + 0.01) % / °C
= 0.03% / °C
Ohms temperature coefficient (100V) = (0.03% + 200Ω) / °C
For measurements 10MΩΩ
ΩΩ
to 100MΩΩ
ΩΩ
Ohms accuracy
% of reading = (1.1 + 60/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 + 60/100) %
= (1.1 + 0.6) %
= 1.7%
Ohms accuracy (100V) = 1.7% + 20kΩ
Ohms temperature coefficient
TC % of reading = (0.02 + 6/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 + 6/100) % / °C
= (0.02 + 0.06) % / °C
= 0.08% / °C
Ohms temperature coefficient (100V) = (0.08% + 200Ω) / °C