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2-14 Measurement Options Model 6517A Getting Started Manual

Control sources

With advanced triggering and basic one-shot triggering, operation is controlled by control

sources, which hold up operation until the programmed event occurs. Basic one-shot trig-

gering uses one control source, while advanced triggering uses three control sources. The

control sources are described as follows:

• Immediate — Event detection is immediately satisﬁed, allowing operation to

continue.

• External — Event detection is satisﬁed when an input trigger via the EXT TRIG IN

connector is received.

• Manual — Event detection is satisﬁed by pressing the TRIG key.

• GPIB — Event detection is satisﬁed when a bus trigger (GET or *TRG) is

received.

• TrigLink — Event detection is satisﬁed when an input trigger via the TRIGGER

LINK connector is received. Not available for basic triggering.

• TIMER — Event detection is immediately satisﬁed on the initial pass through the

layer. Each subsequent detection is satisﬁed when the programmed timer interval

elapses. Not available in the Arm Layer of the advanced trigger model.

• Hold — With this selection, event detection is not satisﬁed by any of the above

control source events and operation is held up. Not available for basic triggering.

If continuous basic triggering is being used, then operation bypasses the control source as

shown in Figure 2-3 and performs a device action.

Device action

The primary device action is a measurement. However, the device action could include a

function change and a channel scan (if scanner is enabled). A channel is scanned (closed)

before a measurement is made. When scanning internal channels, the previous channel

opens and the next channel closes (break-before-make). Also included in the device action

is the internal settling time delay for the relay.

Output trigger

After each measurement (device action), an output trigger pulse occurs and is available at

the rear panel of the Model 6517A. When used with an external scanner (such as a

Model 7001 or 7002 Switch System), each output trigger would be used to select the next

channel in a scan (see “External Scanning” later in this section).

Counters (Advanced triggering)

All three layers of the advanced trigger model use programmable counters that allow oper-

ation to return to or stay in the respective layer. For example, programming the Measure

Layer counter to inﬁnite keeps operation in the Measure Layer. After each device action,

Keithley 6517A Getting Started Guide

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