Keithley 2790, Reference Manual

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2-36 Model 2790 SourceMeter
®
Switch System Reference Manual
Memory patterns
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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.
Description
Most Model 2790 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 reading.
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.
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Memory patterns can be used only with the following functions: DC volts, 2-wire
ohms, and 4-wire ohms.
Recalling memory patterns from the front panel
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.