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2-20 Model 2790 SourceMeter

Switch System User’s Manual

Using memory patterns

Firmware revision level

Memory patterns are supported in Model 2790 units with ﬁrmware A04 and higher. The

ﬁrmware revision level is displayed as part of the power-up cycle.

Overview

Most Model 7751/7752/7753 tests follow the same basic procedure: select a source and set

its level, conﬁgure the Model 2790 measurement, close the necessary relays, and take a read-

ing. Memory Patterns simplify this process, allowing you to store combinations of multiple

closed channels, source settings, and DMM measurement conﬁgurations in nonvolatile

memory. Up to 40 such Memory Patterns, designated M1 through M40, can be stored. There

is also memory pattern M0, which is deﬁned as an “all-open” pattern. Recalling M0 opens

all channels and resets all sources to their factory default values. Similar to closing one 7702

channel and taking a reading, you can recall an individual Memory Pattern to close multiple

channels and take a reading. More importantly, you can include Memory Patterns in a scan

list and cause the Model 2790 to automatically scan through the speciﬁed memory locations.

As each memory pattern is scanned, the sources and DMM are conﬁgured appropriately, the

speciﬁed group of channels is closed, and a reading is taken. Reading limits can also be

assigned to each memory pattern so that during a scan the readings will automatically be

inspected for PASS/FAIL conditions. Digital outputs corresponding to these conditions are

also available.

NOTE Memory patterns can be used only with the following functions: DC volts, 2-wire

ohms, and 4-wire ohms.

Front panel operation

Memory patterns cannot be deﬁned from the front panel, but they can be recalled once

deﬁned by remote commands (see below). To recall deﬁned memory patterns from the

front panel:

1. Press CLOSE.

2. Use the RANGE and keys to select CLOSE: MEMORY, then press

ENTER.

3. Use , , , and to select the memory pattern number (1-40), then press

ENTER.

Keithley 2790 User Manual

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