B+K precision 575A Manuale utente

Model 575ADigital IC Tester

MODEL 575A HANDHELD

DIGITAL IC TESTER

OPERATOR’S MANUAL

Model 575ADigital IC Tester

CONTENTS

1. introduction 1

2. DC input 1

3. battery eliminator 2

4. switching on 3

5. operating modes 4

6. entering test numbers 4

7. testing the IC 5

8. test results 6

9. testing further ICs 7

10. continuous testing 8

11. search mode 8

12. self test mode 9

13. CompactLink mode 10

14. specifications 11

15. IC support list 12

introduction 12

15.2. series54/74 TTL ICs 12

15.3. CMOS ICs 14

15.4. memory ICs 15

15.5. interface, peripheral, microprocessor and LSI ICs 16

15.6. notes on TTL ICs 18

15.7. notes on CMOS ICs 18

15.8. notes on memory ICs 18

Model 575ADigital IC Tester

15.9. notes on interface ICs 19

16. Service Information 20

17. Limited One-Year Warranty 21

Model 575ADigital IC Tester

Page 1

1. introduction

Thank you for purchasing the B & K

Precision Model 575A Hand Held

Digital IC Tester.

The basic function of the B & K

Model 575A Digital IC Tester is to

test a digital IC for correct logical

functioning as described in the truth

table and/or function table. The B & K Model 575A applies the

necessary signals to the inputs of the IC, monitoring the outputs at

each stage and comparing them with the expected states. Any

discrepancy results in a FAIL indication and the faulty pins are

shown on the integral display. Additional facilities are also

provided, amongst them test loops that can be used for goods

inwards inspection, detecting intermittent faults or simply providing

a rapid method of exercising any IC for demonstration or

educational purposes. Since the B & K Model 575A contains an

extensive IC library, it is not necessary to program the unit yourself

other than to key in the IC number. It is also capable of identifying

an unknown IC using the SEARCH mode - thisisa feature that many

userswill find extremely valuable.

The B & K Model 575A is provided with an RS-232 interface

enabling it to be connected to a companion software package

called CompactLink running on a PC. CompactLink allows test

programs for ICsnot included in the internal library to be developed

and downloaded into the B & K Model 575A memory to enhance

the library according to your wishes.

2. DC input

The B & K Model 575A is powered by four AA batteries or by the

use of the battery eliminator input at the rear of the case. To insert

the batteries, turn the unit upside down and remove the battery

Model 575ADigital IC Tester

Page 2

cover by removing the two cross head screws holding it in place.

The batteries must be inserted in the correct orientation, as

indicated by the drawing within the battery compartment. Incorrect

insertion of batteries will not allow the unit to operate. Replace the

battery cover and insert the screws. If the battery voltage falls too

low, a low battery warning symbol will be displayed at the top left

hand cell of the display in normal operating mode. A low battery

warning will also be displayed during a result display. Test results

may be inconsistent under these conditions.

3. battery eliminator

An external battery eliminator is available for prolonged use of the

B & K Model 575A. Many bipolar LSI ICsconsume a large amount

of current when powered up, and battery life can be conserved by

using the eliminator. There isno need to remove the batteriesprior

to inserting the battery eliminator. However, please note that during

prolonged periods of non-use batteries are prone to leakage and

should be removed. Note that to avoid damage to the unit we

strongly advise that you only use the recommended battery

eliminator that is available by contacting your distributor. Note that

using an incorrect battery eliminator voltage may damage the unit

and invalidate the warranty.

Model 575ADigital IC Tester

Page 3

4. switching on

To switch the unit on, simply press the 'ON' key. To preserve battery

life, the unit powers itself off after approximately 3 minutesof non-

use or when “Sw Off” is selected from the main menu. When the

unit is switched on, it first performs a self-diagnosistest. Therefore,

before switching on, check that the test socket is empty to prevent

interference with the diagnostics. If the unit passes the self-test, a

pass result will be displayed on the screen. Pressa key to enter the

main operating mode - the display will be asfollows:

When this initial display is obtained the B & K Model 575A is ready

for use. If, however, the message SELF-TEST FAIL: is displayed

along with a fault message, this indicates that a self-test diagnostic

fault has been detected. Any detected faultswill be displayed one

at a time. Pressing the TEST/EXEC key will then revert to the

opening menu as above, but of course operation of the unit will

then be suspect. Before contacting your distributor, check that the

test socket iscompletely empty.

NO:

MODE:Single:RDY

Model 575ADigital IC Tester

Page 4

5. operating modes

The B & K Model 575A has a number of test modes that are

selected using the MODE/CLEAR key from the initial screen. The

test modes are as follows:

Single - execute a single test on the IC in the socket.

Loop - execute test repeatedly, regardlessof the result.

P Loop - execute test repeatedly, provided the result wasPASS.

F Loop - execute test repeatedly, provided the result wasFAIL.

Search - identify the number of the IC in the socket.

Diags - execute the diagnostic self-test.

CmLink - enter remote mode for CompactLinksoftware.

Sw Off - turn off the unit.

6. entering test numbers

Pressthe MODE/CLEAR key until the desired test mode isdisplayed.

Enter the number of the IC you wish to test. Pressing the

MODE/CLEAR key will clear the last digit from the display if a

mistake ismade.

Note: The NUMERIC information only is entered, leaving out the

manufacturers prefixes and suffixes and IC family information.

As an example, all the following TTL ICs should be entered as 7,

4, 0, 0 on the keypad:

e.g. DM74LS00J, N74LS00N, N74S00N, N7400N, 74ALS00N,

SN74HCT00

A very small number of ICs have differing pin-outs for different IC

families - in these cases, the most popular pin-out only issupported.

The CMOS 4000 seriesis also supported and the IC numbersfor this

family should all begin with "4", so that with for example Motorola

ICs beginning MC14... the initial "1" should be omitted. The same

principles apply also to memory ICs, which are mostly four digit

numbers. With interface ICs of the 8T series the "T" should be

omitted. A complete list of all ICs supported by the B & K Model

575A is contained in the IC SUPPORT LIST at the end of this

Model 575ADigital IC Tester

Page 5

manual together with notes on any special requirementsfor certain

ICs.

Note that if you have stored a user library using CompactLink, an IC

in the user library with the same number as one in the internal

library will take precedence. This allowsa new test to be written for

an existing IC. If you wish both teststo be available, use a different

number for your user test.

7. testing the IC

Insert the IC to be tested in the front of the 40 pin Zero Insertion

Force socket with pin 1 towards the display as shown below:

Ensure that the operating lever on the socket is in the open (i.e. up)

position before inserting the IC. Close the socket by lowering the

lever, making sure that the IC is firmly seated in the socket and

making good contact. Pressthe TEST/EXEC key to activate the test

sequence for the IC. If an invalid IC type number wasentered, or if

the IC you have requested isnot supported the message "Unknown"

will be displayed. Simply entering another IC type number will

automatically clear this error message. If a valid type number was

entered, the IC test will begin and the message "BUSY" will be

displayed while the test proceeds. Many of the tests, however,

execute so quickly that this message is not noticeable.



Model 575ADigital IC Tester

Page 6

8. test results

A pre-determined sequence of signals is applied to the inputsof the

IC and the IC outputsare monitored for the correct logic levels. The

unit uses TTL or CMOS logic thresholds(depending on the selected

IC) when evaluating the response of the IC outputs. If all the

outputs respond correctly, the result PASS will be displayed at the

top right of the display. A scrolling message will contain the IC

function and power pin information.

If a short circuit between the power pins of the IC is detected, a

warning ‘SHT!' will appear on the top right of the display and, since

no valid test isthen possible, the result will FAIL. If the IC under test

takes an excessive amount of current when power is applied, a

warning 'ICC!' will appear. Press the TEST/EXEC key to continue

with the test, or MODE/CLEAR to abandon. Depending on the

condition of the batteries there may also be a ‘BAT!’ warning which

indicates that the batteries are incapable of supplying the current

required by the IC under test. You can continue with the test by

pressing the TEST/EXEC key, but the unit may malfunction because

of a drop in battery voltage. To avoid this, change the batteriesor

use a battery eliminator. Note that a faulty IC may demand more

operating current and therefore will quickly drain the batteries.

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