Bedienungsanleitung Keithley 2001 (Seite 21 von 476) (Englisch)

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Getting Started

2001-900-01 Rev. K/ August 2010 2-7

2.3.1 Idle

The instrument is considered to be in the idle state whenever

it is not operating within one of the layers of the model. The

front panel ARM indicator is off when the instrument is in

the idle state.

When the Model 2001 is taken out of the idle state by

pressing TRIG (or sending the :INIT or :INIT:CONT ON

command over the IEEE-488 bus), the ARM indicator turns

on and operation proceeds into the arm layer.

2.3.2 Arm layer

In general, the instrument requires an arm event to allow

operation to proceed to the scan layer. With an arm source of

Immediate (the factory default), operation immediately

proceeds to the next layer when the instrument is taken out

of the idle state. With one of the other arm sources selected,

the instrument waits until the appropriate event occurs, as

explained below:

• External  The instrument waits for an input trigger

(via EXTERNAL TRIGGER connector on rear panel).

•Manual  The instrument waits until the front panel

TRIG key is pressed.

•GPIB  The instrument waits until a bus trigger (GET

or *TRG) is received.

• Trigger Link  The instrument waits until an input

trigger is received (via TRIGGER LINK).

•Hold  The instrument waits in the arm layer until the

arm source is changed. (Note: the signal and immediate

layer commands, that is, :ARM:LAY1:SIGN and

:ARM:LAY1:IMM, will satisfy the event detection

logic.)

With the Immediate trigger source

selected, a “trigger ignored” message will

be displayed if an external trigger is sent to

the Model 2001 or a manual trigger (i.e.,

pressing TRIG key) occurs. The external

or manual trigger is not used (ignored).

After all scan and measure operations are complete, the

instrument can be returned to the arm layer by programming

the instrument for additional arms. The arm count can be set

to a finite value (1 to 99,999) or to infinity. The factory

default value is one.

After the instrument leaves the arm layer, operation proceeds

into the scan layer.

2.3.3 Scan layer

In general, the instrument requires a scan event to allow

operation to proceed to the measure layer. With a scan source

of Immediate (the factory default), operation immediately

proceeds to the next layer. With one of the other scan sources

selected (External, Manual, GPIB, Trigger Link, Timer, or

Hold), the instrument waits until the appropriate event

occurs.

With a scan source of Timer, the first pass through the scan

layer occurs immediately. If programmed for additional

scans, the instrument waits for an interval between 1msec

and 999,999.999 seconds.

The scan count (number of scans) can be set to a finite value

(1 to 99,999) or to infinity. The “bench” factory default value

is infinity.

With the Immediate trigger source

selected, a “trigger ignored” message will

be displayed if an external trigger is sent to

the Model 2001 or a manual trigger (i.e.,

pressing TRIG key) occurs. The external

or manual trigger is not used (ignored).

After the instrument leaves the scan layer, operation

proceeds into the measure layer.

2.3.4 Measure layer

In general, measure events control the reading rate. With a

measure source of Immediate (the factory default), a device

action occurs immediately. The device action consists of

taking a reading. If scanning is selected, the device action

consists of taking a reading, opening a channel, configuring

for next function in scan list, and closing a channel.

With one of the other measure sources selected (External,

Manual, GPIB, Trigger Link, Timer, or Hold), the instrument

waits until the appropriate event occurs before taking a

reading and, optionally, scanning a channel.

With a measure source of Timer, the first reading is taken

immediately. Each additional reading waits for the Timer to

time out before it is taken.

With the Immediate trigger source

selected, a “trigger ignored” message will

be displayed if an external trigger is sent to

the Model 2001 or a manual trigger (i.e.,

pressing TRIG key) occurs. The external

or manual trigger is not used (ignored).

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