Keithley 2001 User Manual

IEEE-488 Reference
4-5
4.5.3 LOCAL key
The LOCAL key cancels the remote state and restores local
operation of the instrument.
Pressing LOCAL also turns off the REM indicator and re-
turns the display to normal if a user defined message was dis-
played.
Note that the LOCAL key is also inoperative if the LLO (Lo-
cal Lockout) command is in effect.
4.6 Status structure
The status register structure of the Model 2001 is shown in
Figure 4-5. The following information will explain the vari-
ous registers and queues that make up this structure.
4.6.1 Standard event status
The reporting of standard events is controlled by two 16-bit
registers; the Standard Event Status Register and the Stan-
dard Event Status Enable Register. Figure 4-6 shows how
these registers are structured.
In general, the occurrence of a standard event sets the appro-
priate bit in the Standard Event Status Register. This register
can be read at any time to determine which, if any, standard
events have occurred. Also, with the proper use of the Stan-
dard Event Status Enable Register, a standard event can set
the Event Summary Bit (ESB) of the Status Byte Register.
This allows the programmer to take advantage of the service
request (SRQ) feature. See paragraph 4.6.9 for details.
Standard Event Status Register  This is a latched, read
only register that is used to record the occurrence of standard
events. Each bit in the register (except bit B1 which is not
used by the Model 2001) represents a standard event.
Descriptions of these standard events are provided in
paragraph 4.10.4.
When a standard event occurs, the appropriate bit in the
Standard Event Status Register sets. For example, if you at-
tempt to read data from an empty Output Queue, a Query Er-
ror (QYE) will occur and set bit B2 of the status register. A
set bit in this register will remain set until an appropriate op-
eration is performed to clear the register. The Standard Event
Status Register can be read at any time by using the follow-
ing common query command (see paragraph 4.10.4 for de-
tails):
*ESR?
Reading this register using the *ESR? command also clears
the register. The following list summarizes all operations that
clear the Standard Event Status Register:
1. Cycling power.
2. Sending the *CLS common command.
3. Sending the *ESR? common command.
Standard Event Status Enable Register  This register is
programmed by the user and serves as a mask for standard
events. When a standard event is masked, the occurrence of
that event will not set the Event Summary Bit (ESB) in the
Status Byte Register. Conversely, when a standard event is
unmasked, the occurrence of that event will set the ESB bit.
A bit in the Standard Event Status Register is masked when
the corresponding bit in the Standard Event Status Enable
Register is cleared (0). When the masked bit of the Standard
Event Status Register sets, it is ANDed with the correspond-
ing cleared bit in the Standard Event Status Enable Register.
The logic “0” output of the AND gate is applied to the input
of the OR gate and thus, will not set the ESB bit in the Status
Byte Register.
A bit in the Standard Event Status Register is unmasked
when the corresponding bit in the Standard Event Status En-
able Register is set (1). When the unmasked bit of the Stan-
dard Event Status Register sets, it is ANDed with the
corresponding set bit in the Standard Event Status Enable
Register. The logic “1” output of the AND gate is applied to
the input of the OR gate and thus, sets the ESB bit in the Sta-
tus Byte Register.
The individual bits of the Standard Event Status Enable Reg-
ister can be set or cleared by using the following common
command (see paragraph 4.10.2 for details):
*ESE <NRf>
The Standard Event Status Enable register can be read at any
time by using the following common query command (see
paragraph 4.10.3 for details):
*ESE?
Reading this register using the *ESE? command does not
clear the register. The following list summarizes all opera-
tions that will clear the Standard Event Status Enable Regis-
ter:
1. Cycling power.
2. *ESE 0

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.