Section 3
3-67
At all times the inequality:
Max Current Test Current ratio
is tested and if it fails, the measurement is stopped.
When editing is complete, press the <OK> key to accept all changed data and press
the <PREVIOUS> key until the display returns to the Main Menu.
Step 4) Now that you are in the Main Menu you can go into the <Measure> menu
and start up the measurement as in a 4-terminal "Normal Ohms" mode
application with the exception that now instead of displaying the
measurement in ratio or ohms, you can now display the measurement as
ratio, ohms, C, F or K. (if you have entered values for the IPTS68 or
ITS90 coefficient sets).
3.8.6. Summary of Recommended Test Setups
a) Normal Ohm mode, 4-terminal measurements (10 milliwatt on Rs)
Rs
()
Rx
()
Itest
(mA)
Imax
(mA)
Comment
0.1 0.1 141 150 2 mW tests
due to output current limit of 150 mA
on Rx and 250 mA on Rs
0.1 1 14.1 150
1 1 100 150
1 10 10 150
10 10 31.6 100
10 100 3.16 100
100 100 10 31.6
100 1 k 1 31.6
1 k 1 k 3.16 10
1 k 10 k 0.316 10
10 k 10 k 1 3.16
10 k 100 k 0.1 3.16 Reversal rate 90 seconds minimum
100 k 100 k 0.316 0.35 Not a recommended configuration.
Use 2-terminal mode.
100 k 1 M 0.032 0.35 Not a recommended configuration
Use 2-terminal mode
Table 3-1 : 4-Terminal Mode Test Setup
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