Keithley 2000 User Manual

Stepping and scanning trigger model additions
The trigger model presented in “Trigger operations” earlier in this section has some addition-
al capabilities when stepping or scanning. These are outlined below:
• Timer — With this control source, event detection is immediately satisfied on the initial
pass. Each subsequent detection is satisfied when the programmed timer interval (up to
99H:99M:99.99S) elapses.
• Reading counter — For both stepping and scanning, the reading count can be entered
from SHIFT-CONFIG. (This is referred to as the trigger counter over the bus.) The read-
ing counter can bypass the idle state. Operation will wait until the programmed control
source event occurs.
• Channel counter — For scanning, the scan list length (maximum channel less minimum
channel) is used to bypass the control source allowing a specified number of device ac-
tions to occur. (This counter is referred to as the sample counter over the bus.)
These additional blocks are shown in the trigger models of Figures 3-12 and 3-13. Uses of
the timer control source, reading counter, and channel counter are shown in the scanning exam-
ples later in this section.
Idle
Control
Source
Immediate
External
Timer
Event
Detection
Delay
Device
Action
Output
Trigger
More
Readings
?
Reading
Count
(Trigger counter)
Yes
No
Figure 3-12
Front panel trig-
gering with step-
ping
3-24 Measurement Options

Keithley 2000 Specifications

General

Digits	6.5
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Resistance Range	100 Ω to 100 MΩ
Connectivity	IEEE-488 (GPIB)
Display Type	VFD