11-2 Limit Testing Models 2500 and 2502 User’s Manual
Types of limits
As shown in Figure 11-1, there are six limit tests that can be performed on a DUT.
• Limit 1: channel 1 hardware (compliance) limit test.
• Limit 2: channel 2 hardware (compliance) limit test.
• Limits 3 to 6: software limits for channel 1, channel 2, ratio, and delta.
A test is only performed if it is enabled. Thus, you can perform one, two, or all six tests.
The tests are always performed in the order shown in the drawing.
Figure 11-1
Limit tests
Pass/fail information
Pass/fail information for limit tests can be obtained as follows:
•A PASS or FAIL indication on the front panel display.
• By programming the unit to output specific pass/fail bit patterns on the Digital I/O
port, which can be used to control other equipment such as a device handler for bin-
ning operations. See “Binning systems,” page 11-10, and Section 12, “Digital I/O
port,” for more information.
•With the :CALCulate7:LIMit<n>:FAIL? query via remote, where <n> is the limit test
number (Section 17, “CALCulate7”).
• By reading various status bits (Section 14, “Status Structure,” and Section 17,
“FORMat subsystem”).
• By noting a P or F preceding buffer location numbers (Section 8, “Buffer location
number”).
Pass
Limit
LO
Fail
Fail
Limit
HI
Pass or Fail on Compliance
Pass
Limit
LO
Fail
Fail
Limit
HI
Limit 1 or
Limit 2 Test
(Compliance)
Limit 3 Test
(Coarse Limits)
Limit 4-6 Tests
(Fine Limits)
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