Keithley 6514 User Manual

10-2 Limit Tests
Limit testing
As shown in Figure 10-1, there are two limit tests that can be performed on a DUT. Limit 1
is used as the wide pass band and Limit 2 is used as the narrow pass band. It is up to the user to
specify limits that conform to this pass band relationship.
Figure 10-2 shows an example where the HI and LO limits for limit 1 are ±2V, and the Hi and
LO limits for limit 2 are ±1V. A 0V reading passes both limit 1 and limit 2 tests. A +1.5V reading
passes limit 1 but fails limit 2. A +2.5V reading fails both limit 1 and limit 2.
The 2-stage limit testing process is shown in Figure 10-3. If limit 1fails, the “L1” message is
displayed and the test is finished. Limit 2 is not tested because the pass band relationship
between the two stages implies that if limit 1 fails, limit 2 must also fail. If limit 1 passes, the
limit 2 test is performed. If limit 2 fails, the “L2” message is displayed. If both limit 1 and limit
2 pass, the “OK” message is displayed. The display messages for limit tests are summarized in
Table 10-1.
LO
LO
Limit
Limit
HI
HI
Limit
Limit
Limit 1 Test
(Wide Pass Band)
Limit 2 Test
(Narrow Pass Band)
Fail
Fail Fail
FailPass
Pass
Figure 10-1
Limit tests
-2V
-1V
LO Limit
LO Limit
+2V
+1V
HI Limit
HI Limit
Limit 1 Test
(Wide Pass Band)
Limit 2 Test
(Narrow Pass Band)
Fail
Fail Fail
FailPass
Pass
Figure 10-2
Limit tests example

Keithley 6514 Specifications

General

Brand	Keithley
Model	6514
Category	Measuring Instruments
Language	English