Keithley 2001 User Manual

Front Panel Operation
3-123
Input
The single digital input is located on the digital I/O port (con-
nector J1031, pin 1). The input sense is fixed at active-high
(ON=5V). Use the INPUT menu to change the status of the
input ON or OFF.
Digital I/O menu
Access the DIGITAL I/O menu as follows:
1. Display the GENERAL MENU.
2. Use the and keys to highlight DIGITAL I/O, and
press ENTER. The following will be displayed:
DIGITAL I/O MENU
OUTPUT-STATE OUTPUT-SENSE INPUT
OUTPUT-STATE: Use this menu item to check or change
the state (on or off) of the four digital output lines. The actual
level of an “on” line is determined by the sense, which is
controlled by the next menu item (OUTPUT-SENSE). To se-
lect OUTPUT-STATE, place the cursor on OUTPUT-STATE
and press ENTER. If, for example, all the digital output lines
are off, the following message is displayed:
DIGITAL OUT LINES
1=OFF 2=OFF 3=OFF 4=OFF
1. To retain the displayed states of the output lines, press
ENTER or EXIT. The instrument returns to the DIGI-
TAL I/O MENU.
2. To change the state of one or more digital output lines,
perform the following steps:
A. Position the cursor at the line that you wish to
change.
B. Press the RANGE ▲ or RANGE ▼ key. These keys
simply toggle between “ON” and “OFF”.
C. Repeat steps A and B for each line that you wish to
change.
D. With the desired states displayed, press ENTER.
The instrument returns to the DIGITAL I/O MENU.
OUTPUT-SENSE: Use this menu item to check or change
the sense of the digital output lines. The sense of each line
can be active-high (ON = +5V) or active- low (ON = 0V). To
select OUTPUT-SENSE, place the cursor on OUTPUT-
SENSE and press ENTER. The following message is dis-
played:
SELECT OUTPUT LINE
TTL1 TTL2 TTL3 TTL4
1. Place the cursor on the appropriate line and press EN-
TER. A message indicating the sense of the selected line
is displayed. For example:
TTL1 LOGIC SENSE
ACTIVE-HIGH ACTIVE-LOW
The cursor position indicates the present sense of the
line.
2. To retain the presently selected sense, press ENTER or
EXIT. The display returns to the SELECT OUTPUT
LINE menu.
3. To change sense, place the cursor on the alternate
selection, using the cursor keys ( or ), and press
ENTER. The instrument returns to the SELECT
OUTPUT LINE menu.
4. When finished, press EXIT to return to the DIGITAL I/
O MENU.
INPUT: Use this menu item to read (ON or OFF) the digital
input line. Its sense is fixed at active-high (ON = 5V).
To select INPUT, place the cursor on INPUT and press
ENTER. If, for example, the digital input line is “ON”, the
following message is displayed:
DIGITAL INPUT LINE
Status = ON
The status is updated when INPUT is selected; it does not
track the status from the previous message. Press ENTER or
EXIT to return the instrument to the GENERAL MENU.
SERIAL #
To display the serial number, memory option, SCPI version,
and firmware revision levels of the instrument, place the cur-
sor on SERIAL# and press ENTER. The following informa-
tion is displayed:
Serial #XXXXXX MEM1
SCPI version 1991.0
software rev AXX/AYY
where: #XXXXXX is the serial number of the instrument.
MEM1 is the memory option present (also could be
STD or MEM2)
AXX is the firmware level for the main microcontrol-
ler.
AYY is the firmware level for the display microcon-
troller.

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.