Keithley 6517B Reference Manual

Model 6517B Electrometer Reference Manual Section 14: SCPI command reference
6517B-901-01 Rev. C / August 2015 14-149
:SOURce <name>
This command is used to specify the arm, scan, and measure event control sources.
Usage
:ARM[:SEQuence[1]][:LAYer[1]]:SOURce <name>
:ARM[:SEQuence[1]]:LAYer2:SOURce <name>
:TRIGger[:SEQuence[1]]:SOURce <name>
:SOURce?
<name>
 HOLD: Hold operation in specified layer
 IMMediate: Pass operation through specified layer
 RTCLock: Select real-time clock as event (Arm Layer 1 only)
 MANual: Select manual event
 BUS: Select GPIB trigger as event
 TLINk: Select trigger link as event
 EXTernal: Select external triggering as event
 TIMer: Select timer as event (not available for Arm Layer 1)
Details
These commands are used to select the event control source for the specified layer. With HOLD
selected, operation stops and waits indefinitely in the specified layer. While in HOLD, operation can be
continued by sending the :IMMediate command or the :SIGNal command. Keep in mind
however, that if the layer count is >1, HOLD is again enforced when operation loops back around.
With IMMediate selected (do not confuse :SOURce IMMediate with :IMMediate), operation
immediately passes through the specified layer.
A specific event can be used to control operation through a layer. With BUS selected, operation
continues when a GPIB trigger (GET or *TRG) is sent. With TLINk selected, operation continues
when an input trigger through the trigger link is received.
A real-time clock event is available for the arm layer (Arm Layer 1). With RTCLock selected, event
detection is satisfied at the programmed date and time allowing operation to continue on in the trigger
model (see the IEEE-488 trigger model (on page 11-16)).
A TIMer event is available for the scan and measure layers. With TIMer selected for the specified
layer, the event occurs at the beginning of the timer interval, and every time it times out. For example,
if the measure layer timer is programmed for a 30-second interval, the first pass through the measure
layer control source occurs immediately. Subsequent scan events occur every 30 seconds. The
interval for the timer is set using the :TIMer <n> (on page 14-150) command.
Also see
:TIMer <n> (on page 14-150)

Keithley 6517B Specifications

General

Input Impedance	>200 TΩ
Electrometer Type	Electrometer/High Resistance Meter
Current Measurement Range	20 fA to 20 mA
Display	Vacuum Fluorescent Display
Communication Interfaces	IEEE-488 (GPIB), RS-232
Power Supply	100 V / 120 V / 220 V / 240 V; 50 Hz / 60 Hz
Resistance Measurement Range	Up to 200 TΩ