Scientific 5000 Series, Manual

Page: 303 / 360

APPENDIX M
MODEL 5000 SERIES MANUAL
Version 1.23
13-63
device to fail (a very unlikely condition). At the more common limit of 100 ohms, the
delta V would have to be less than 1 volt to fail.
Therefore, while very high R
S
devices (>5K ohms) may exhibit oscillation and
resulting variation in the R
S
calculation, devices within the allowable range will not. In
the range of interest, readings are quite stable and accurate. If oscillation does
occur, a very high R
S
reading normally results.
Because I
S
values below 10mA result in an out of range R
S
value, I
S
is limited to
2.5mA in the R
S
calculation (see Figure 13-47).
Figure 13-47 shows a typical Sidac test program:

Step 1: the I
S
test is run

Step2: the I
S
test result is then limited to 2.5mA by calculation

Step 3: 80% if the I
S
result is calculated

Step4: The V
S
test is run using the result of Step 3

Step 5: the V
BO
test is run

Step 6: the I
BO
test is run

Step 7: required to provide the I
BO
result to Step 8

Step 8: the R
S
test calculation
Note: To improve overall test time and datalog clarity, both Autorange and Datalog
should be turned off on steps 1, 2, 3, 4 and 7
Figure 13-47 Sidac Test Program Screen