Keithley 2001 User Manual

IEEE-488 Reference
4-4
4.4 Controller programming
The programming instructions covered in this section use ex-
amples written with Hewlett-Packard BASIC version 4.0.
This language was chosen because of its versatility in con-
trolling the IEEE-488 bus. This section covers those state-
ments that are essential to Model 2001 operation.
NOTE
Controller programming information for
using the IBM PC interface through the
Capital Equipment Corporation (CEC),
I/O Tech, and National IEEE-488
interfaces is located in the Appendix.
A partial list of HP BASIC 4.0 statements is shown in Table
4-2. The statements have a one or three digit argument that
must be specified. The first digit is the interface select code,
which is set to 7 at the factory. The last two digits of those
statements requiring a 3-digit argument specify the primary
address.
Those statements with a 3-digit argument show a primary ad-
dress of 16 (the factory set primary address). For a different
address, you would, of course, change the last two digits to
the required value. For example, to send a GTL command to
a device using a primary address of 17, the following state-
ment would be used: LOCAL 717.
Some of the statements have two forms; the exact configura-
tion depends on the command to be sent over the bus. For ex-
ample, CLEAR 7 sends a DCL command, while CLEAR
716 sends the SDC command to a device with a primary ad-
dress of 16.
4.5 Front panel aspects of
IEEE-488 operation
The following paragraphs discuss aspects of the front panel
that are part of IEEE-488 operation, including messages, sta-
tus indicators, and the LOCAL key.
4.5.1 Error and status messages
Table 3-4 summarizes the error and status messages associ-
ated with IEEE-488 programming. Note that the instrument
may be programmed to generate an SRQ, and command que-
ries can be performed to check for specific error conditions.
4.5.2 IEEE-488 status indicators
The REM (remote), TALK (talk), LSTN (listen), and SRQ
(service request) annunciators show the present IEEE-488
status of the instrument. Each of these indicators is briefly
described below.
REM — As the name implies, this indicator shows when the
instrument is in the remote state. Note that REM does not
necessarily indicate the state of the REN line, as the instru-
ment must be addressed to listen with REN true before the
REM indicator turns on. When the instrument is in remote,
all front panel keys except for the LOCAL key are locked
out. When REM is turned off, the instrument is in the local
state, and front panel operation is restored.
TALK — This indicator is on when the instrument is in the
talker active state. The unit is placed in this state by address-
ing it to talk with the correct MTA (My Talk Address) com-
mand. TALK is off when the unit is in the talker idle state.
The instrument is placed in the talker idle state by sending it
an UNT (Untalk) command, addressing it to listen, or with
the IFC (Interface Clear) command.
LSTN — This indicator is on when the Model 2001 is in the
listener active state, which is activated by addressing the in-
strument to listen with the correct MLA (My Listen Address)
command. Listen is off when the unit is in the listener idle
state. The unit can be placed in the listener idle state by send-
ing UNL (Unlisten), addressing it to talk, or by sending IFC
(Interface Clear) over the bus.
SRQ — The instrument can be programmed to generate a
service request (SRQ) when one or more errors or conditions
occur. When this indicator is on, a service request has been
generated. This indicator will stay on until the serial poll byte
is read or all the conditions which caused SRQ have ceased
to exist. See paragraph 4.6.8 for details.
Table 4-2
HP BASIC 4.0 IEEE-488 statements
Action BASIC statement
Transmit string to device 16.
Obtain string from device 16.
Send GTL to device 16.
Send SDC to device 16.
Send DCL to all devices.
Send remote enable.
Cancel remote enable.
Serial poll device 16.
Send local lockout.
Send GET to device 16.
Send IFC.
OUTPUT 716;A$
ENTER 716;A$
LOCAL 716
CLEAR 716
CLEAR 7
REMOTE 7
LOCAL 7
SPOLL (716)
LOCAL LOCKOUT 7
TRIGGER 716
ABORT 7

Keithley 2001 Specifications

General

Model	2001
Category	Multimeter
Manufacturer	Keithley
Type	Digital Multimeter
Digits of Resolution	7.5
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Frequency Range	3 Hz to 500 kHz
Connectivity	GPIB, RS-232
Display	VFD
Resistance Accuracy	0.008% + 2.0 mΩ
Frequency Accuracy	±0.01%
DC Current Range	10 μA to 3 A
AC Current Range	10 μA to 3 A
Power Supply	100 V to 240 V AC, 45 Hz to 66 Hz

Summary

WARRANTY

LIMITATION OF WARRANTY

Manual Print History

Safety Precautions

General Information

Introduction

Contains general information about the Model 2001.

Features

Lists important Model 2001 features such as full range of functions and two-line display.

Options and accessories

Details available options and accessories for the Model 2001.

Getting Started

Front and rear panel summary

Describes controls, connectors on front/rear panels, and the front panel display.

Initial configuration

Reviews initial configuration information for operation.

Front panel operation

Demonstrates basic front panel operation with examples.

Front Panel Operation

Power-up procedure

Covers connecting to line power, warm-up, defaults, and sequence.

Display

Covers display format and messages.

Functions

Describes measurement functions like DC/AC voltage, current, resistance, frequency, temp.

IEEE-488 Reference

IEEE-488 bus connections

Explains instrument connections to the IEEE-488 bus.

Primary address selection

Explains how to set the primary address from the front panel.

Status structure

Explains the various registers and queues that make up the status structure.

Specifications

Model 2001 Specifications

Contains complete specifications for the 2001, including accuracy and calibration intervals.

ABSOLUTE ACCURACY

Details absolute accuracy specifications traceable to NIST.

TYPICAL ACCURACIES

Specifies typical accuracies, warranted unless noted.

DC VOLTS

DCV INPUT CHARACTERISTICS AND ACCURACY

Details DCV input characteristics and accuracy.

SPEED AND ACCURACY

Provides speed and accuracy specifications for DCV.

DCV READING RATES

Lists DCV reading rates for various configurations.

DCV PEAK SPIKES MEASUREMENT

REPETITIVE SPIKES ACCURACY

Specifies accuracy for repetitive spikes.

AC VOLTS

ACV INPUT CHARACTERISTICS

Details ACV input characteristics.

NORMAL MODE RMS

Provides RMS accuracy specifications for normal mode.

AVERAGE ACV MEASUREMENT

Specifies accuracy for average ACV measurements.

AC VOLTS (cont’d)

SETTLING CHARACTERISTICS

Describes settling characteristics for normal mode.

COMMON MODE REJECTION

Specifies common mode rejection for 1kΩ imbalance.

MAXIMUM VOLT•Hz PRODUCT

States the maximum voltage-frequency product.

OHMS

TWO-WIRE AND FOUR-WIRE OHMS (2W and 4W Ohms Functions)

Details 2-wire and 4-wire resistance measurements.

SPEED AND ACCURACY

Provides speed and accuracy for ohms measurements.

DC AMPS

DCI INPUT CHARACTERISTICS AND ACCURACY

Details DC current input characteristics and accuracy.

DCI READING RATES

Lists DCI reading rates for various configurations.

AC AMPS

ACI INPUT CHARACTERISTICS

Details AC current input characteristics.

AC COUPLING

Selects input coupling for AC current measurements.

ACV CREST FACTOR MEASUREMENT

Explains ACV crest factor measurement.

OPERATING SPEED

Command Receive and Interpret Speed

Details the speed for command receive and interpret.

FUNCTION CHANGE SPEED

Describes speed for changing functions.

MIXED FUNCTION SCAN SPEED

Provides speed for mixed function scan.

Default Conditions

Calculate 1 subsystem

Subsystem to control CALC 1 math calculations.

Calculate 2 subsystem

Subsystem to control CALC 2 operations on buffer data.

Calculate 3 subsystem

Subsystem to control CALC 3 limit tests.

Default Conditions (cont.)

Calibration subsystem

Controls calibration parameters.

Display subsystem

Controls display readings and messages.

Route subsystem

Controls switching operations.

Default Conditions (cont.)

Sense commands

Configures and controls measurement functions and digital input port.

AC current commands

Configures AC current measurement parameters.

DC current commands

Configures DC current measurement parameters.

Default Conditions (cont.)

AC voltage commands

Configures AC voltage measurement parameters.

Default Conditions (cont.)

2-wire resistance commands

Configures 2-wire resistance measurements.

Default Conditions (cont.)

4-wire resistance commands

Configures 4-wire resistance measurements.

Temperature commands

Configures temperature measurements.

IEEE-488.2 Common Commands

*CLS — clear status

Clears all event registers and the Error Queue.

*RST — reset

Returns the instrument to the *RST default conditions.

SCPI Command Subsystems

:CALCulate[1]

Subsystem to control CALC 1 math calculations.

:CALCulate2

Subsystem to control CALC 2 operations on buffer data.

:CALCulate3

Subsystem to control CALC 3 limit tests.

SCPI Command Subsystems (cont.)

:CALCulate3 :LIMit[1]

Path to configure upper limit for LIMIT 1 test.

SCPI Command Subsystems (cont.)

:CALCulate3 :LIMit2

Path to control LIMIT 2 test.

SCPI Command Subsystems (cont.)

:DISPlay subsystem

Controls display readings and messages.

SCPI Command Subsystems (cont.)

:FORMat subsystem

Covers commands to select data format for transferring readings.

:OUTPut subsystem

Covers commands to set polarity for digital output lines.

SCPI Command Subsystems (cont.)

:ROUTe subsystem

Controls switching operations.

SCPI Command Subsystems (cont.)

:SENSe[1]] subsystem

Configures and controls measurement functions.

SCPI Command Subsystems (cont.)

:CURRent AC

Configures AC current measurement parameters.

SCPI Command Subsystems (cont.)

:CURRent[:DC]

Configures DC current measurement parameters.

SCPI Command Subsystems (cont.)

:VOLTage:AC

Configures AC voltage measurement parameters.

SCPI Command Subsystems (cont.)

:VOLTage[:DC]

Configures DC voltage measurement parameters.

SCPI Command Subsystems (cont.)

:RESistance

Configures 2-wire resistance measurements.

SCPI Command Subsystems (cont.)

:FRESistance

Configures 4-wire resistance measurements.

SCPI Command Subsystems (cont.)

:TEMPerature

Configures temperature measurements.

SCPI Command Subsystems (cont.)

:TRANsducer <name>

Specifies transducer type for temperature measurements.

SCPI Command Subsystems (cont.)

:RTD commands

Programs RTD parameters.

SCPI Command Subsystems (cont.)

:TCouple:TYPE <name>

Configures the thermocouple type for measurements.

SCPI Command Subsystems (cont.)

:RJUNctionX

Configures the specified reference junction for thermocouple measurements.

SCPI Command Subsystems (cont.)

:SIMulated <n>

Specifies the simulated reference temperature.

SCPI Command Subsystems (cont.)

:REAL

Specifies the temperature coefficient (TC) of the 'real' reference junction.

Interface Function Codes

ASCII Character Codes and IEEE-488 Multiline Interface Command Messages

Controller Programs

IBM PC/XT/AT with Capital Equipment Corporation PC<>488 Interface (Keithley PC-488-CEC)

Control program for IBM PC/XT/AT with CEC PC<>488 Interface.

IBM PC/XT/AT or PS/2 with IOtech Driver488 Software

Control program for IBM PC/XT/AT with IOtech Driver488 Software.

IEEE-488 Bus Overview

Introduction

Explains the IEEE-488 bus communication system.

Bus description

Describes the IEEE-488 bus structure and signal lines.

Bus lines

Details data lines, management lines, and handshake lines.

IEEE-488 Bus Overview (cont.)

Universal multiline commands

General bus commands requiring no addressing.

Addressed multiline commands

Commands requiring device address.

Common commands

Commands common to all devices on the bus.

IEEE-488 Conformance Information

SCPI Conformance Information (cont.)

SCPI Conformance Information (cont.)

SCPI Conformance Information (cont.)

SCPI Command Subsystems

*CLS — clear status

Clears all event registers and the Error Queue.

*RST — reset

Returns the Model 2001 to the *RST default conditions.