BK PRECISION 575A Operation 电路图.pdf

Model 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. MODEL 575A HANDHELD DIGITAL IC TESTER OPERATORS MANUAL RadioFans.CN 收音机爱 好者资料库 Model 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. CONTENTS 1.introduction1 2.DC input1 3.battery eliminator2 4.switching on3 5.operating modes4 6.entering test numbers4 7.testing the IC5 8.test results6 9.testing further ICs7 10.continuous testing8 11.search mode8 12.self test mode9 13.CompactLink mode10 14.specifications11 15.IC support list12 introduction12 15.2.series 54/74 TTL ICs12 15.3.CMOS ICs14 15.4.memory ICs15 15.5.interface, peripheral, microprocessor and LSI ICs16 15.6.notes on TTL ICs18 15.7.notes on CMOS ICs18 15.8.notes on memory ICs18 RadioFans.CN 收音机爱 好者资料库 Model 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. 15.9.notes on interface ICs19 16.Service Information20 17.Limited One-Year Warranty21 RadioFans.CN 收音机爱 好者资料库 Model 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. 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 shownontheintegraldisplay.Additionalfacilities are also provided, amongst them test loops that can be used for goods inwards inspection, detecting intermittent faults or simply providing arapidmethodofexercisinganyICfordemonstrationor 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 - this is a feature that many users will 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 ICs not 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 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. Page 2 cover by removing the two cross head screws holding it in place. Thebatteries mustbeinsertedinthecorrectorientation, 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 ICs consume a large amount of current when powered up, and battery life can be conserved by using the eliminator. There is no need to remove the batteries prior 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 stronglyadvisethatyouonlyusetherecommendedbattery 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 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. 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 minutes of non- use or when “Sw Off” is selected from the main menu.When the unit is switched on, it first performs a self-diagnosis test. 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. Press a key to enter the main operating mode - the display will be as follows: 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 faults will 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 is completely empty. NO: MODE:Single:RDY Model 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. 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, regardless of the result. P Loop- execute test repeatedly, provided the result was PASS. F Loop- execute test repeatedly, provided the result was FAIL. Search- identify the number of the IC in the socket. Diags- execute the diagnostic self-test. CmLink - enter remote mode for CompactLink software. Sw Off- turn off the unit. 6.entering test numbers Press the MODE/CLEAR key until the desired test mode is displayed. Enter thenumber oftheIC youwish to test.Pressing the MODE/CLEAR key will clear the last digit from the display if a mistake is made. 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 is supported. The CMOS 4000 series is also supported and the IC numbers for 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 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. Page 5 manual together with notes on any special requirements for 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 allows a new test to be written for an existing IC.If you wish both tests to 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. Press the TEST/EXEC key to activate the test sequence for the IC.If an invalid IC type number was entered, or if the IC you have requested is not 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 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. Page 6 8.test results A pre-determined sequence of signals is applied to the inputs of the IC and the IC outputs are 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 is then 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 batteries or use a battery eliminator.Note that a faulty IC may demand more operating current and therefore will quickly drain the batteries. Model 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. Page 7 In the case of a FAIL result, the error conditions at all the non- functional pins of the IC will be scrolled on the display, and the IC function will be shown.The various failure conditions that can be displayed are as follows: LOW- the output was LOW when HIGH was expected. MID LOW- the output was LOW, but not a valid logic level. HIGH- the output was HIGH when LOW was expected. MID HIGH- the output was HIGH, but not a valid logic level. LOAD 0V- the input cannot be driven HIGH. LOAD 5V- the input cannot be driven LOW. In some cases, the scrolling test results may include one or more WARNING indications. These warnings indicate conditions that may result in an incorrect test result, and are as follows: D/F- result may be invalid because last self-test failed. BAT- battery voltage too low during test. ICC- large current taken by IC under test. Before discarding a failed IC check that the correct IC type number was entered and also check that the IC pins are clean and making good contact with the test socket.Note that there is no way of stopping a test once it has commenced, but see the description of loop functions later in this manual. 9.testing further ICs After a test is completed, the test result will be displayed.To test another IC of the same type, simply insert the next IC and press the TEST/EXEC key again. To test a different IC, enter the new IC type number in the usual way, noticing that pressing the first digit of the new number automatically clears the previous number from the display.Remember that the MODE/CLEAR key can be used if an error is made during the entry of the IC type number. Model 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. Page 8 10.continuous testing It is possible to test the same IC repeatedly to detect intermittent or temperature-related faults, or to rapidly test a batch of identical ICs. There are three types of test loop modes: Loop- execute a test repeatedly, regardless of the result. P Loop- execute a test repeatedly, provided the result is PASS. F Loop- execute a test repeatedly, provided the result was FAIL. The B & K Model 575A is configured into one of the loop modes using the MODE/CLEAR key as described earlier.Insert the IC and press TEST/EXEC in the usual way to start the continuous test process. The result of each test is displayed as PASS or FAIL on the top right of the display. In LOOP mode, this allows a large batch of identical ICs to be tested, without any action on the part of the operator other than inserting the IC.When the IC is inserted, sufficient time must be allowed for the test to take place before the result status is updated, so if in doubt the IC should be tested in single mode so that the approximate test time can be determined. It will be found that high throughput can be obtained using this mode. To stop any of the test loops, press MODE/CLEAR, but note that the test in progress is completed before the command is obeyed.The effect of this is usually unnoticeable, but where the test takes a reasonabletimeto execute there will be a delay before the instrument responds to the MODE/CLEAR key. Note: Testing high current ICs in loop mode will drain the batteries quickly, and it is recommended that a battery eliminator is used if you wish to perform loop tests. 11.search mode This feature allows the type number of an unknown IC to be determined, provided the IC is actually contained in the B & K Model 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. Page 9 Model 575A library, and it is a correctly functioning IC. This facility is useful when the IC type number is illegible or has been removed. Use the MODE/CLEAR key to choose SEARCH mode, insert the unknown IC into the socket and press the TEST/EXEC key. You will be prompted to choose the number of pins of the IC you wish to identify - use the MODE/CLEAR key to select from 8 to 40 pins or QUIT to abandon this mode.Press the TEST/EXEC key again to start the SEARCH or to quit as required. Duringtheidentificationprocess thedisplay will indicate the number of ICs identified (IDENT:) and will show graphically how far through the library the SEARCH has progressed.At the end of the SEARCH, a list of all the similar ICs will be scrolled onto the display. The list may be scrolled again by pressing the TEST/EXEC key. If the IC cannot be identified the message Not in Library will be displayed.This means either that the IC is not in the library or it is non-functional.Note that if the B & K Model 575A detects excessive supply current (ICC! or BAT! warnings), the IC will not be identified during the SEARCH, but can still be tested in SINGLE mode. If you have a user library present the search will extend to user ICs in that library also.However, CompactLink contains a facility for excluding ICs from the search if required. 12.self test mode This feature allows you to check the integrity of the unit, including the pin drivers and receivers, power supplies and other internal hardware. The test executes automatically at switch on, but you can if you wish perform a self-test at any time by selecting Self-Test (DIAGS)modeusingtheMODE/CLEARkeyandpressing TEST/EXEC. If a fault is discovered a brief description will be displayed which will help our engineers to locate and rectify the fault.This message Model 575A Digital IC Tester Copyright 1992-2007B&K PrecisionCorp. Page 10 should be noted and quoted in any correspondence relating