Keithley 2601B Reference Manual page 779

Series 2600B System SourceMeter® Instrument Reference Manual
B. Allow the readings to settle, then get the Series 2600B readings:
r0_hi, r0_lo = smua.contact.r()
C. Characterize both 50 Ω resistors using the resistance function of the digital multimeter.
D. As illustrated in the following figure:
• Characterize both 50 Ω resistors using the resistance function of the digital multimeter.
• Connect a 50 Ω resistor between the SENSE LO and LO terminals.
• Connect the second 50 Ω resistor between the SENSE HI and HI terminals.
E. Allow the readings to settle, then get the Series 2600B readings:
r50_hi, r50_lo = smua.contact.r()
F. Send the contact check low calibration adjustment command:
smua.contact.calibratelo(r0_lo, Z_actual, r50_lo, 50_ohm_actual)
Where:
r0_lo
Z_actual
r50_lo
50_ohm_actual = Actual 50 Ω resistor value; the actual value of the resistor between the SENSE
Typical values:
smua.contact.calibratelo(r0_lo, 0, r50_lo, 50.15)
Where r0_lo is the same value as measured in step B, and r50_lo is the same value as
measured in step E.
2600BS-901-01 Rev. B / May 2013
Figure 152: Connections for contact check 50 ohm calibration
= Series 2600B 0 Ω low measurement
= Actual zero value; the resistance of the short between the SENSE LO and LO
terminals
= Series 2600B 50 Ω low measurement
LO and LO terminals
Appendix B: Calibration
B-37