Keithley 6517B User Manual (English)

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5-16 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Section 5: Remote Operation Model 6517B Electrometer User’s Manual

'*RST sets TRIG:SOUR to IMM

CALL SEND(27, "arm:lay2:sour ext", status%)

CALL SEND(27, "trig:coun inf;sour tim;tim .05", status%)

'start everything

CALL SEND(27, "init", status%)

After the Model 6517B receives the INITiate command, it stops in ARM:LAYer2 of the trigger

model, waiting for a pulse on the external trigger jack. After the external trigger signal occurs, the

Model 6517B moves to the TRIGger layer. Since TRIGger:SOURce is set to TIMer, a reading is

triggered immediately, with a subsequent reading every 50ms. Because TRIGger:COUNt has

been set to infinity, the trigger model never exits from the TRIGger layer.

Generating SRQ on buffer full

When your program must wait until the Model 6517B has completed an operation, it is more

efficient to program the Model 6517B to assert the IEEE-488 SRQ line when it is finished, rather

than repeatedly serial polling the instrument. An IEEE-488 controller will typically address, then

unaddress the instrument to talk each time it performs a serial poll. Repeated polling of the Model

6517B will generally reduce its overall reading throughput. Therefore, use the srq%() function

call.

The Model 6517B provides a status bit for near

ly every operation it performs. It can be

programmed to assert the IEEE-488 SRQ line whenever a status bit becomes true or false. The

IEEE-488 controller (your computer) can examine the state of the SRQ line without performing a

serial poll, thereby detecting when the 6517B has completed its task without interrupting it in the

process.

The following example program segment sets up the Model 6517B to assert SRQ when the

eading buffer has completely filled, then arms the reading buffer, initiates readings, and waits for

the Model 6517B to indicate that the buffer is full.

This is not a complete program. Not shown are th

e commands to configure the trigger model and

the reading buffer (see the next example). The example shown here can be modified for any event

in the Model 6517B status reporting system.

'Reset STATus subsystem (not affected by *RST)

CALL SEND(27, "stat:pres;*cls", status%)

CALL SEND(27, "stat:meas:enab 512", status%)

'Enable BFL

CALL SEND(27, "*sre 1", status%)'enable MSB

CALL SEND(27, "trac:feed:cont next", status%)

'Start everything

CALL SEND(27, "init", status%)

WaitSRQ:

IF (NOT(srq%)) THEN GOTO WaitSRQ

CALL SPOLL(27, poll%, status%)

IF (poll% AND 64)=0 THEN GOTO WaitSRQ

Notice that after the program has detected an asserted SRQ line, it serial polls the Model 6517B to

determine if it is the device requesting service. This is necessary for two reasons:

• Serial polling the Model 6517B causes it to quit asserting the SRQ line

• In test systems that have more than one IEEE-488 instrument programmed to

assert SRQ,

your program must determine which instrument is actually requesting service

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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