Keithley 2182, Руководство пользователя, Страница: 154 / 339

9-6 Stepping and Scanning
Other Stepping/Scanning operations
• Control source :
• Immediate — With immediate triggering, event detection occurs immediately
allowing operation to drop down to the next trigger model block (Delay).
• Timer — The timer is used to set a time interval between channels in a step/scan
cycle. When STEP or SCAN is pressed, the timer starts and event detection occurs
immediately allowing operation to drop down to Delay.
When operation later loops back to this control source, it waits until the timer
interval expires. If the timer interval is already expired, event detection will be
satisfied immediately.
• External trigger — After the stepping or scanning operation is configured,
pressing the EX TRIG key places the instrument in the external trigger mode. When
STEP or SCAN key is pressed, the step/scan is enabled. However, it doesn’t start
until an external trigger is received or the TRIG key is pressed. After the trigger
occurs, operation drops down to the Delay block.
• Delay — If a delay (auto or manual) is being used, operation will hold up at this block
until the delay period expires.
• Device action — Measurements are performed at this block. For internal stepping, the
first measurement is performed on Channel 2 of the Model 2182. Subsequent
measurements are performed on Channel 1. For internal scanning and external scanning,
each measurement corresponds to a channel in the step/scan list. All readings are
automatically stored in the buffer.
• Output trigger — After each measurement is performed, an output trigger is applied to
the rear panel Trigger Link connector.
• Trigger counter — Reading Count specifies the total number of measurements to
perform. If another measurement is to be performed, operation loops back to the control
source.
Stepping/Scanning controls
• SHIFT-CONFIG — Selects and configures internal or external scanning. See “ Step/
Scan configuration ” for details.
• EX TRIG — Selects the External Trigger control source.
• TRIG — Satisfies event detection for the External Trigger control source.
• STEP and SCAN — Enables a stepping or scanning operation of consecutive channels.
• SHIFT - HALT — Stops stepping or scanning and restores the trigger model to a
non-stepping/scanning mode.