Keithley 2001 User Manual

IEEE-488 Reference
4-16
bit in the status register will set when the corresponding bit
in the condition register changes from 1 to 0.
The individual bits of the transition filter registers can be set
or cleared by using the following SCPI commands:
:STATus:MEASurement:PTR <NRf>
:STATus:MEASurement:NTR <NRf>
The transition filter registers can be read at any time by using
the following SCPI query commands:
:STATus:MEASurement:PTR?
:STATus:MEASurement:NTR?
Reading a transition filter register using the above query
commands does not affect the contents of the register.
The following operations will set (1) all the bits of the PTR
register and clear (0) all the bits of the NTR register:
1. Cycling power.
2. Sending the :STATus:PRESet command.
3. Sending the :STATus:MEASurement:PTR 65535 and
:STATus:MEASurement:NTR 0 commands.
Measurement Event Register  This is a latched, read-
only register whose bits are set by the Measurement Condi-
tion Register and Transition Filter. Once a bit in this register
is set, it will remain set (latched) until the register is cleared
by a specific clearing operation. The bits of this register are
logically ANDed with the bits of the Measurement Event En-
able Register and applied to an OR gate. The output of the
OR gate is the Measurement Summary Bit (MSB) of the Sta-
tus Byte Register. The following SCPI query command can
be used to read the Measurement Event Register:
:STATus:MEASurement:EVENt?
Reading this register using the above SCPI command clears
the register. The following list summarizes all operations that
will clear the Measurement Event Status Register:
1. Cycling power.
2. Sending the *CLS common command.
3. Sending the :STATus:MEASurement? query command.
Measurement Event Enable Register  This register is
programmed by the user and serves as a mask for the Mea-
surement Event Register. When masked, a set bit in the Mea-
surement Event Register will not set the Measurement
Summary Bit (MSB) in the Status Byte Register. Conversely,
when unmasked, a set bit in the Measurement Event Register
will set the MSB bit.
A bit in the Measurement Event Register is masked when the
corresponding bit in the Measurement Event Enable Register
is cleared (0). When the masked bit of the Measurement
Event Register sets, it is ANDed with the corresponding
cleared bit in the Measurement Event 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 MSB bit in the Status
Byte Register.
A bit in the Measurement Event Register is unmasked when
the corresponding bit in the Measurement Event Enable Reg-
ister is set (1). When the unmasked bit of the Measurement
Event Register sets, it is ANDed with the corresponding set
bit in the Measurement Event Enable Register. The logic “1”
output of the AND gate is applied to the input of the OR gate
and thus, will set the MSB bit in the Status Byte Register.
The individual bits of the Measurement Event Enable Regis-
ter can be set or cleared by using the following SCPI com-
mand:
:STATus:MEASurement:ENABle <NRf>
The following SCPI query command can be used to read the
Measurement Event Enable Register:
:STATus:MEASurement:ENABle?
Reading this register using the above SCPI command does
not clear the register. The following list summarizes opera-
tions that will clear the Measurement Event Enable Register:
1. Cycling power.
2. Sending the :STATus:MEASurement:ENABle 0 com-
mand.
4.6.7 Questionable event status
The reporting of questionable events is controlled by a set of
16-bit registers; the Questionable Condition Register, the
Transition Filter, the Questionable Event Register and the
Questionable Event Enable Register. Figure 4-12 shows how
these registers are structured. Each of the bits that is used in
these registers represent a questionable event. Descriptions
of the questionable event bits are provided in paragraph 4.21.
The questionable status registers are controlled by the
:STATus:QUEStionable commands in the :STATus
subsystem (see paragraph 4.21).

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.