Keithley 2002 User Manual

IEEE-488 Reference
3-20
Idle and initiate
The instrument is considered to be in the idle state whenever
it is not operating within one of the layers of the trigger
model. The front panel ARM indicator is off when the
instrument is in the idle state. While in the idle state, the
instrument cannot perform any measure or scan functions.
Over the bus, there are two SCPI commands that can be used
to take the instrument out of the idle state; :INITiate or
:INITiate:CONTinuous ON.
Notice that with continuous initiation enabled (:INIT:CONT
ON), the instrument will not remain in the idle state after all
programmed operations are completed. However, the instru-
ment can be returned to the idle state at any time by sending
the *RST command, the *RCL command, or the
SYST:PRES command.
Trigger model layers
As can be seen in Figure 3-13, the trigger model uses three
layers; Arm Layer1, Arm Layer 2 and the Trigger Layer. For
front panel operation, these layers are known as the Arm
Layer, Scan Layer and Measure Layer.
Once the Model 2002 is taken out of the idle state, operation
proceeds through the layers of the trigger model down to the
device action where a measurement occurs.
Control sources — In general, each layer contains a control
source which holds up operation until the programmed event
occurs. The control sources are summarized as follows:
• IMMediate — With this control source selected, event
detection is immediately satisfied allowing operation to
continue.
• MANual — Event detection is satisfied by pressing the
TRIG key. Note that the Model 2002 must be taken out
of remote before it will respond to the TRIG key. Press
LOCAL or send LOCAL 16 over the bus to take the
instrument out of remote.
• BUS — Event detection is satisfied when a bus trigger
(GET or *TRG) is received by the Model 2002.
• TIMer — Event detection is immediately satisfied on
the initial pass through the layer. Each subsequent
detection is satisfied when the programmed timer inter-
val (1 to 999999.999 seconds) elapses. A timer resets to
its initial state when operation loops back to a higher
layer (or idle). Note that TIMer is not available in Arm
Layer 1.
• EXTernal — Event detection is satisfied when an input
trigger via the EXTERNAL TRIGGER connector is
received by the Model 2002.
• TLINk — Event detection is satisfied when an input
trigger via the TRIGGER LINK is received by the
Model 2002.
• RTCLock — Event detection is satisfied when the pro-
grammed time and date occurs. Note that the real-time
clock is only available as a control source for Arm
Layer 1.
• HOLD — With this selection, event detection is not sat-
isfied by any of the above control source events and
operation is held up.
Control source loops — As can be seen in the flowchart,
each layer has three paths that allow operation to loop around
the control source. These three paths are described as
follows:
• :DIRection (Source Bypass) — When a source bypass
is enabled (:DIRection SOURce) and the EXTernal or
TLINk control source is selected, operation will loop
around the control source on the initial pass through the
layer. If programmed for another event detection in the
layer, the bypass loop will not be in effect even though
it is still enabled. The bypass loop resets (be in effect) if
operation loops back to a higher layer (or idle).
In Arm Layer 1 and Arm Layer 2, enabling a source
bypass also enables the respective output trigger. In the
Trigger Layer, its output trigger is always enabled and
occurs after every device action. See Output Triggers
for more information.
• :IMMediate — Each time an :IMMediate command is
sent, operation loops around the respective control
source. It is used when you do not wish to wait for the
programmed event to occur (or when the HOLD control
source is selected). Note that in Arm Layer 1 and the
Trigger Layer, :IMMediate also loops operation around
the delays.
• :SIGNal — Same function as an :IMMediate command.
Delays — Arm Layer 2 and the Trigger Layer have a pro-
grammable Delay (0 to 999999.999 seconds) that is asserted
after an event detection. Note, however, that a Delay can be
bypassed by sending an :IMMediate or :SIGNal command.
Device Action — The primary device action is a measure-
ment. However, the device action could include a function
change and a channel scan (if scanner is enabled). A channel
is scanned (closed) before a measurement is made. When
scanning internal channels, the previous channel opens and
the next channel closes (break-before-make). Also included
in the device action is the internal settling time delay for the
relay.

Keithley 2002 Specifications

General

Resolution	8.5 digits
DC Voltage Accuracy	±0.0006%
Maximum DC Voltage	1000 V
Maximum AC Voltage	750 V
Maximum DC Current	3 A
Maximum AC Current	3 A
Connectivity	GPIB, RS-232
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Resistance Range	10 Ω to 1 GΩ
Model	2002
Category	Multimeter
Interface	GPIB, RS-232
AC Current Accuracy	±0.1%
Frequency Range	0.1Hz to 300kHz
Display	VFD
Type	Digital
Power Supply	100-240V AC, 50/60Hz
Current Range (DC)	100 μA to 3 A
Current Accuracy (DC)	±0.01%
Current Range (AC)	100 μA to 3 A
Current Accuracy (AC)	±0.1%
DC Current Range	100 μA to 3 A
AC Current Range	100 μA to 3 A

Summary

Safety Precautions

General Information

Introduction

Provides an overview of the Model 2002 multimeter and its manual structure.

Features

Highlights key capabilities of the Model 2002, including measurement functions and display.

Warranty Information

Details warranty service procedures and contact information.

Manual Addenda

Explains how changes to the manual will be communicated.

Safety Symbols and Terms

Defines safety symbols and terms used in the manual and on the instrument.

Specifications

Refers to Appendix A for detailed product specifications.

Inspection

Instructions for inspecting the instrument after unpacking.

Options and Accessories

Lists available options and accessories for the Model 2002.

Front Panel Operation

Introduction

Outlines the sections covered in the front panel operation chapter.

Power-up

Information on connecting to line power, warm-up, and power-up sequence.

Display

Covers display formats, messages, and multiple display features.

Functions

Describes the measurement functions of the instrument (DCV, ACV, DCI, ACI, Ohms, Freq, Temp).

Range

Explains how range selection affects resolution, accuracy, and maximum signal.

Relative

Details on using the relative feature to null offsets or subtract baseline values.

Triggers

Discusses front panel triggering, configuration, and external triggering.

Buffer

Covers buffer use, data storage, and recalling data, time stamp, and statistics.

Filter

Explains the use of digital filter types to reduce reading noise.

Math

Describes calculations that can be performed on readings in continuous operation.

Scanning

Discusses setting up internal and external scans, ratio, and delta calculations.

Menu

Covers selections controlled from the main menu, including setup, GPIB, calibration, and tests.

IEEE-488 Reference

Introduction

Provides reference information on programming the Model 2002 over the IEEE-488 bus.

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.

QuickBASIC 4.5 programming

Summarizes programming using QuickBASIC 4.5 with the IEEE interface.

General bus commands

Covers general IEEE-488 commands for basic operations like placing the unit in remote.

Front panel aspects of IEEE-488 operation

Covers status indicators, messages, and LOCAL key use for IEEE-488 operation.

Status structure

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

Trigger model

Explains the operation process (Trigger Model) over the IEEE-488 bus.

Program message syntax

Covers the syntax rules for common commands and SCPI commands.

Common commands

Covers the IEEE-488.2 common commands used by the Model 2002.

SCPI Signal Oriented Measurement Commands

Covers the signal oriented commands used by the Model 2002.

Calculate subsystems

Covers math operations: CALCulate1 (math), CALCulate2 (buffer), CALCulate3 (limits).

:DISPlay subsystem

Controls the display of readings and messages on the Model 2002.

:FORMat subsystem

Selects the data format for transferring instrument readings over the bus.

:INPut subsystem

Controls the Model 1801 Nanovolt Preamp.

:OUTPut subsystem

Sets the polarity for the digital output port.

:ROUTe subsystem

Configures and controls switching.

Sense subsystems

Configures measurement functions (Sense 1) and reads digital input (Sense 2).

:SOURce subsystem

Sets the logic level (true or false) of each digital output line.

:STATus subsystem

Controls the status registers.

:SYSTem subsystem

Contains miscellaneous commands not covered by other subsystems.

:TRACe subsystem

Configures and controls data storage into the buffer.

Trigger subsystem

Configures the three layers of the Trigger Model.

:UNIT subsystem

Configures and controls measurement units for TEMP and ACV.

Specifications

DCV Input Characteristics and Accuracy

Provides DCV input characteristics and accuracy specifications.

AC Volts

Specifications for ACV measurements, including RMS, average, peak, and crest factor.

AC Amps

Specifications for ACI and DCI measurements.

Two-Wire and Four-Wire Ohms

Specifications for resistance measurements.

DC In-Circuit Current

Specifications for the DC in-circuit current measurement function.

HP3458A Emulation Mode

Introduction

Provides information on using the Model 2002 HP3458A emulation mode for compatibility.

Firmware revision level

Details how to display the firmware revision level.

Enabling the HP3458A emulation mode

Step-by-step guide to enable HP3458A emulation mode via the GPIB menu.

Unsupported commands

Lists commands not supported by the Model 2002 HP3458A emulation mode.

Command syntax and compatibility

Discusses command syntax and compatibility issues for HP3458A emulation.

Parameter defaults

Explains default parameters assumed when omitted, and unsupported syntax.

Delimiting parameters

Describes the use of spaces or commas for parameter separation.

Function command short forms

Lists short forms for common FUNC commands.

Unsupported queries

Describes behavior for unsupported query commands.

Error checking

Details commands for emulation mode error checking.

Supported HP3458A commands

Summarizes supported commands with descriptions.

APER

Programs the A/D integration time.

ARANGE

Enables or disables the autorange mode.

AZERO

Enables or disables the autozero mode.

CALSTR?

Requests the calibration date.

CSB

Clears status register bits.

DELAY

Programs the time interval between trigger and sample events.

DISP

Enables/disables display, clears display, sends message to display.

EMASK

Enables certain error conditions to set the error bit in the status register.

ERR?

Requests the error register value.

ERRSTR?

Requests the error number and error response string.

FREQ

Selects the frequency measurement function.

FSOURCE

Selects the signal type for frequency or period measurements.

FUNC

Selects the measurement function and range.

ID?

Requests the instrument's identification string.

LINE?

Requests the AC power line frequency.

MCOUNT?

Requests the number of readings presently stored in memory.

MEM

Enables/disables reading memory and designates storage mode.

MFORMAT

Clears reading memory and designates storage format for new readings.

MSIZE?

Requests reading memory size.

NDIG

Programs the number of display digits used for readings.

NPLC

Programs the A/D converter integration time in power line cycles.

NRDGS

Programs the number of readings per trigger and the trigger event.

OCOMP

Enables or disables the offset-compensated ohms mode.

OFORMAT

Programs the data format for both normal and memory readings.

OPT?

Requests a report of installed options.

PER

Selects the period measurement function.

PRESET

Selects one of two preset instrument configurations.

RANGE

Selects the measurement range.

RESET

Resets the Model 2002 to the power-on state.

REV?

Requests the main and front panel revision levels.

RMEM?

Requests readings stored in memory.

RQS

Enables or disables status register bits that can cause an SRQ.

RSTATE

Recalls an instrument configuration from memory.

SETACV

Selects the RMS conversion technique for AC and AC+DC measurements.

SRQ

Enables SRQ.

SSTATE

Stores the instrument's present configuration in memory.

STB?

Requests the status register value.

SWEEP

Programs the interval between readings and number of samples per trigger.

T or TRIG

Programs the trigger event.

TARM

Specifies the event that arms the trigger event.

TEMP?

Requests the internal temperature of the Model 2002.

TERM

Requests INPUTS switch status.

TIMER

Defines the timer sample interval.