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5-8 Measurement Concepts Models 2500 and 2502 User’s Manual

Data ﬂow

Data ﬂow for front panel operation is summarized by the block diagrams provided in

Figure 5-6, while Figure 5-7 shows data ﬂow through the various CALC blocks. Note that

if REL is enabled, the result of the rel operation is sent to the other blocks.

NOTE See Appendix C for remote operation data ﬂow information that describes the

CALC blocks in detail.

Basic readings

With data store and limit tests disabled (Figure 5-6A), the Model 2500 simply displays the

selected measurement function readings (MSR1, MSR2, RATIO, or DELTA). No data

storage or limit test is performed when those two functions are disabled.

Data storage enabled

With data store enabled (Figure 5-6B), all readings are stored in the data store buffer as

processed regardless of the selected measurement function before or during storage. The

type of recalled reading, or statistic, depends on the selected measurement function during

recall (MSR1, MSR2, RATIO, or DELTA).

Limit test enabled

With a limit test enabled (Figure 5-6C), the selected limit feed (MSR1, MSR2, RATIO, or

DELTA) is used for Limit 3 through Limit 6 tests. Pass/Fail (P or F) information is dis-

played on the front panel along with the readings. If data store is performed with a limit

test already enabled, pass/fail status information is also displayed with the readings during

data recall.

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Keithley 2500 User Manual

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