Keithley 486 Manuale utente

Model 486

PICOAMMETER

Model 487

PlCOAMMETER/SOURCE

QUICK REFERENCE GUIDE

INTRODUCTION

This quick reference guide contains descriptions of vari-

ous features and information concerning the operation of

the Model 4861487.

~21990,Keithley Instruments, Inc.

Cleveland, Ohio, U.S.A.

Document Number: 486-903-01 Rev. A

Asyst tsa registered trademarkof Asyst Software technologies.

Hewtett-Packard Is a registered trademark of Hewlett-Packard

Company.

IBM and ATare registeredtrademarksand PC/XTisatrademark

of International Business Machines, I~C.

PC&488 isa registered trademark of Capital Equipment Cow

ration.

TABLE OF CONTENTS

SAFETY WARNINGS ......................... 5

ERROR MESSAGES ......................... 7

CURRENT MEASUREMENTS .................. 8

VOLTAGE SOURCE (Model 487) .............. 14

V/l OHMS MEASUREMENTS (Model 487) ....... 19

MENU .................................... 21

FRONT PANEL TRIGGERING ................. 22

EXTERNAL TRIGGERING .................... 24

DATA STORE OPERATION .................. 26

ANALOG OUTPUT .......................... 27

TALK-ONLY ............................... 28

IEEE-488 PROGRAMMING .................. .29

Device-dependent Commands ................. 29

Display Intensity ........................ 29

Reading Source ........................ 29

Zero Check and Correct .................. 29

Display ............................. ..3 0

V/lOhms ........................... ..3 0

Data Format ........................... 39

Hit Control ............................ 31

Self-Test .............................. 31

EOI and Bus Hold-off ................... .31

Default Conditions or Calibration ........... 32

SRQ ............................... ..3 2

Data Store ............................ 32

Operate .............................. 33

Filters ................................ 33

Interval ............................... 33

Range................................3 3

Integration ............................ 34

Trigger ...............................

Status.. ..............................

Voltage Source (487)

i:l

.................... 35

Delay ................................

Execute ............................ 35 a

..3 5

Terminator .......................... ..3 5

Relative .............................. 36

Data Formats .............................. 36 a

SRQ Mask and Serial Poll Byte ................ 40

StatusWords ............................ ..4 1 a

SAFETY WARNINGS

The following precautions should be observed before us-

ing Model 488/487. Refer to main manual for detailed

safety information and complete operating instructions.

The Model 48W487 is intended for use by qualified per-

sonnel who recognize shock hazards and are familiar

with the safety precautions required to avoid possible in-

jury. Read over the instruction manual carefully before

using the instrument.

Before operating the instrument, make sure the line cord

is connected to a properly grounded power receptacle.

Exercise extreme caution when a shock hazard is pre-

sent. Lethal voltages may be present on the test fixture or

the Model 487 output jacks. The American National Stan-

dards Institute (ANSI) states that a shock hazard exists

when voltage levels greater than 30V RMSor 42.4V peak

are present. A good safety practice is to expect that

hazardous voltage is present in any unknown circuit

before measuring.

Inspect the connecting cables, test leads, and jumpers

for possible wear, cracks, or breaks before each use.

For maximum safety, do not touch the Model 487 con-

nections, test fixture, test cables or connections to any

other instruments while power isapplied to the circuit un-

der test. Turn off all power and discharge all capacitors

before connecting or disconnecting cables or jumpers.

Also, keep the test fixture lid closed while power is ap-

plied to the device under test. Safe operation requires the

use of the lid interlock.

Do not touch any object which could provide a current

path to the common side of the circuit under test or power

line (earth) ground.

Do not exceed the maximum signal levels of the instru-

ment, as shown on the rear panel and as defined in the

specifications and operation section of the instruction

manual.

Connect the chassis of the test fixture to safety earth

ground using #I 8 AWG or larger wire.

Instrumentation and accessories should not be con-

nected to humans.

Maintenance should only be performed by qualified serv-

ice personnel. Before performing any maintenance, dis-

connect the line cord and all test cables from the instru-

ment.

ERROR MESSAGES

Table 1. Error Messages

Message Description

NO DEFLTS Checksum error in default condi-

tion during power-up.

UNCAL Checksum error in calibration

during power-up

ROM ERROR Failed ROM self-test.

RAM ERROR Failed RAM self-test.

TRG OVERUN Trigger overrun; instrument trig-

gered while still processing a pre-

vious trigger.

CAL VALUE Calibration value conflicts with

the currently selected range.

CAL ERROR Calibration value not within allow-

able limits.

CAL LOCK Sent calibration command with

calibration switch (CAL LOCK)

disabled.

CAL ZCHK Cannot calibrate picoammeter

with zero check enabled.

INTERLOCK Tried to put V-Source of Model

487 in operate while an enabled

safety interlock switch is open.

CURRENT MEASUREMENTS

Current Ranges

SHIFT

q v RANGE A

El 0

AUTO

RANGE

The available current ranges of the Model 4861487 are

listed in Table 2.

2nA

20nA

200nA

2c1A

20/.iA

2oopA

2mA 2.19999inA

‘Higher voltages requirecurrent to be limitedto 3mA.

2.19999nA

21.9999nA

219.999nA

2.19999pA

21.9999pA

219.999uA

35OVdc

5OVdc

50Vdc

Table 2. Current Ranges

Autorange is enabled by pressing SHIFTand thenAUTO

RANGE in that order.

CAUTION

To avoid possible damage to the instru-

ment, do not apply more than 5OVdcto

the input when autorange is enabled

(unless an external series resistor to

limit current to 3mA is used).

Zero Check and Correct

ZERO

SHIFT CHECK

q El

CORRECT

When zero check is enabled, the input amplifier is inter-

nally disconnected from the input connector of the instru-

ment. A 1OOkGresistor shunts the input connector, and

the instrument displays the offset of the selected range.

When zero correction is performed, the offset is meas-

ured and algebraically subtracted from every subsequent

reading (including zero checked readings).

Zero check is enabled by pressing ZERO CHECK.

Pressing ZERO CHECK a second time disables the fea-

ture.

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