1659 Digibridge 电路图.pdf

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1、 1659 RLC Digibridge Instruction Manual FORM 1659-0120-02/Bl QuadTech, Inc., 1992 5 Clock Tower Place, 210 East Maynard, Massachusetts, U.S.A. 01754 March, 2000 Telephone 978-461-2100 Sales 800-253-1230 Facsimile 978-461-4295 Website The material in this manual is for informational purposes only and

2、 is subject to change, without notice. QuadTech assumes no responsibility for any enor or for consequential damages that may result from the misinterpretation of any procedures in this publication. Contents Specifications Warranty Introduction -Section 1 Installation -Section 2 Operation -Section 3

3、Theory -Section 4 Service -Section 5 Parts Lists and Diagrams -Section 6 RadioFans.CN 收音机爱 好者资料库 These supplementary pages contain information of improvements or modifications not documented in the current manual. All references to GenRad in the manual now apply to QuadTech, Inc. Page iv -Table of C

4、ontents (Parts Lists and Diagrams -Section 6) Power supply assembly, board layout and schematic (pages 6-13 0 to 50 degrees C, 1 us, and (if START is not debounced) a-c the settling time or programmed delay. For single measurements, the DUT can be disconnected after e. The selected BIN line goes low

5、 at f; the other BIN lines stay high. AVERAGE measurement routines, ACQ OVER goes low (e) at the end of the last measurement. 2.7.2 Timing Figure 2-3. Refer to the accompanying figure for timing guidelines. Notice that START must have a duration of 1 us (minimum) in each state (high and low). If STA

6、RT is provided by a mechanical switch without debounce circuitry, the Digibridge will make many false starts; if START does not settle down (low) within the default settling time after the first transition to high, the measurement time may increase substantially. Measurement starts at time d, which

7、is essentially the same as time b or c; measurement is completed at g. (The START signals are expanded for clarity.) Interval a-e, during which the DUT must remain connected for data acquisition, is considerably shorter than the total measurement time a-g. The DUT can be changed after e (indexing on

8、 ACQ, to save time) or after g (indexing on EOT, for a simpler test setup), as explained below. After the calculation interval e-f, measurement results are available for sorting, i.e., one of the BIN lines goes low. A few micro-seconds later, EOT goes low (can be used to set a latch holding the bin

9、assignment). ACQ OVER, the selected BIN line, and EOT then stays low until the next start command. The time required for measurement depends on test conditions and operating selections. Interval a-e can be less than 15 ms; the cycle a-g can be less than 40 ms; refer to paragraph 3.5 for details. Set

10、 up the handler either of two ways: indexing on EOT or indexing on ACQ, as follows. The handler must supply a signal (here called start next measurement) when it has completed connection of the DUT to the test fixture. 2-6 INSTALLATION Indexing on EDT. Set up the handler to respond to the EOT signal

11、 from the Digibridge, which occurs at the end of test, when the bin assignment is available for sorting. Set up the Digibridge to receive its START signal from the handlers start next measurement signal. This setup is simpler than the one below. NOTE The Digibridge requires that a non-zero value be

12、entered for nominal value to enable generation of the EOT signal and indication by the GO/NO-GO lights; see paragraphs 3.8.3,3.8.4. Indexing on ACQ. Set up the handler to respond to the ACQ OVER signal from the Digibridge, which occurs when the data acquisition is complete. The handler can then remo

13、ve the DUT from the test fixture and replace it with another DUT, while the Digibridge is calculating the result. In addition, set up an interface that provides a START signal to the Digibridge by logical combination of the EOT signal from the Digibridge AND the start next measurement signal from th

14、e handler. Indexing on ACQ results in higher measurement rate than indexing on EOT. INSTALLATION 2-7 2.8 IEEE-488 INTERFACE (OPTION) 2.8.1 Purpose FigFigure 2-4. If you have the 1658-9620 interface option, you can connect this instrument to a printer or into a system (containing a number of devices

15、such as instruments, apparatus, peripheral devices, and generally a controller or computer) in which each component meets IEEE Standard 488-1978, Standard Digital Interface for Programmable Instrumentation. A complete understanding of this Standard (about 80 pages) is necessary to understand in deta

16、il the purposes of the signals at the IEEE- 488 INTERFACE connector on the rear panel of this instrument. NOTE For copies of the Standard, order IEEE Std 488- 1978, IEEE Standard Digital Interface for Programmable Instrumentation, from IEEE Service Center, Department PB-8, 445 Hoes Lane, Piscataway,

17、 N, J.08854, To make connection to a single device like a printer, use a IEEE-488 cable, which fits the rear-panel connector labeled IEEE-488 INTERFACE. For larger systems, each device is connected to a system bus, in parallel, usually by the use of several stackable cables. Refer to the figure for

18、a diagram of a hypothetical system. A full set of connections is 24 (16 signals plus shield and ground returns), as tabulated below and also in the Standard. Suitable cables, stackable at each end, are available from Component Manufacturing Service, Inc., West Bridgewater, MA 02379, U.S.A. (Their pa

19、rt number 2024/1 is for a 1-meter-long cable.) This instrument will function as either a TALK/LISTEN or a TALK ONLY device in the system, depending on the position of the TALK switch. TALK/LISTEN denotes full programmability and is suited for use in a system that has a controller or computer to mana

20、ge the data flow. The handshake routine assures that the active talker proceeds slowly enough for the slowest listener that is active, but is not limited by any inactive (unaddressed) listener. TALK ONLY is suited to a simpler system -e.g. Digibridge and printer -with no controller and no other talk

21、er. Either mode provides measurement results to the active listeners in the system. 2-8 INSTALLATION Figure 2-5. The handshake process, illustrated by timing diagrams of the pertinent signals, for a system with one talker and several listeners. For details, refer to the standard. 2.8.2 Interface Fun

22、ctions Figure 2-5. The following functions are implemented. Refer to the Standard for an explanation of the function subsets, represented by the identifications below. For example, T5 represents the most complete set of talker capabilities, whereas PPO means the absence of a capability. SH1, source

23、handshake (talker) AR1, acceptor handshake (listener) T5, talker (full capability, serial poll) L4, listener (but not listen-only) SR1, request by device for service from controller RL2, remote control (no local lockout, no return-to-Iocal switch) PP0, no parallel poll DC, device clear DT1, device t

24、rigger (typically starts measurement) C0, no controller functions. The handshake cycle is the process whereby digital signals effect the transfer of each data byte by means of status and control signals. The cycle assures, for example, that the data byte has settled and all listeners are ready befor

25、e the talker signals data valid. Similarly, it assures that all listeners have accepted the byte before the talker signals data not valid and makes the transition to another byte. Three signal lines are involved, in addition to the 8 that convey the byte itself. Refer to the accompanying figure. INS

26、TALLATION 2-9 2.8.3 Signal Identification Refer to Table 2-2 for a key to signal names, functions, and pin numbers. Further explanation is found in the Standard. The first three signals listed take part in the handshake routine, used for any multiline message via the data bus; the next five are used

27、 to manage the flow of information; the last eight constitute the multiline message data bus. 2.8.4 Codes and Addresses General. The device-dependent messages, such as instrument programming commands and measurement data (which the digital interface exists to facilitate), have to be coded in a way t

28、hat is compatible between talkers and listeners. They have to use the same language. Addresses have to be assigned, except in the case of a single talker only with one or more listeners always listening. The Standard sets ground rules for these codes and addresses. In this instrument, codes for inpu

29、t and output data have been chosen in accordance with the rules. The address (for both talker and listener functions) is user selectable, as explained below. Instrument Program Commands. The set of commands used in remote programming is an input data code to which the instrument will respond as a ta

30、lker/listener, after being set to a remote code and addressed to listen to device-dependent command strings. The set includes all of the keyboard functions except switching external bias ON/OFF and full recalibration, which are not remotely programmable. Refer to paragraph 3.11.3 for a table of the

31、commands used in programming. Address. The initial setting of address, provided by the factory, is binary 00011. Consequently, the talkaddress command (MTA) is C in ASCII code and, similarly, the listen-address command (MLA) is #. If a different address pair is desired, set it manually using the fol

32、lowing procedure. WARNING Because of shock hazard and presence of electronic devices subject to damage by static electricity (conveyed by hands or tools), disassembly is strictly a service procedure. a. Take the Digibridge to a qualified electronic technician who has the necessary equipment for mino

33、r disassembly and adjustment. Remove the interface option assembly, as described in the 1659 Digibridge Service instructions. (There is no need to remove the top cover first.) b. Set the switches in DIP switch assembly S2 to the desired address, which is a 5-bit binary number. (See below.) c. Replac

34、e the interface option assembly in its former place. Notice that S2 is located at the end of the interface option board, about 3 cm (1 in.) from the TALK switch S1. If S2 is covered, lift the cover off, exposing the DIP switch, which has 6 tiny switches, numbered 1 thru 6. To enter logical 1 s, depr

35、ess the side of each switch nearest the end of the board (switch open). To enter logical 0s, depress the other side of the switch (switch closed). The address is read from 5 to 1 (not using 6). Thus, for example, to set up the address 00011, enter 0s at positions 5, 4, 3; enter ls at positions 2, 1.

36、 (This makes the talk address C and the listen address #.) Strictly speaking, the address includes more; S2 determines only the device-dependent bits of the address. You cannot choose talk and listen addresses separately, only as a pair. The list of possible pairs is shown in Table 2-3. 2-10 INSTALL

37、ATION INSTALLATION 2-11 * Do NOT set the switch to 11111, because a talk address of - would be confused with an untalk command, and a listen address of ?, would be confused with an unlisten command. (ASCII code for - is 1 011 111 and for ? is 0 111111.) 2-12 INSTALLATION In the above example, the re

38、mote message codes MLA and MTA are X0100011 and X1000011, respectively. Thus the listen address and the talk address are distinguished, although they contain the same set of devicedependent bits, which you set into S2. Data Output. Data (results of measurements) are provided on the DI01.DI07 lines a

39、s serial strings of characters. Each character is a byte, coded according to the 7-bit ASCII code, as explained above. The alphanumeric characters used are appropriate to the data, for convenience in reading printouts. The character strings are always provided in the same sequence as that tabulated

40、in paragraph 3.11.3; for example: RLC value, QDR value, bin number -if all 3 were selected (by the X7 command). The carriage-return and line-feed characters at the end of each string provide a printer (for example) with the basic commands to print each string on a separate line. For example, if the

41、measurement was 0.54321 uF (1 kHz, range 4 held), the character string for RLC value is: U(space)C(space)uF(2 spaces )0.54321( CR)(LF). If the D measurement was .001, the character string for QD value is: (2 spaces)D(5 spaces)00.0010(CR)(LF). If the measurement falls into bin 9, the character string

42、 for bin number is: F(space)BIN(2 spaces)9(CR)(LF). The character string for RLC value has the length of 17 characters; for QD value, 17 characters; for bin number, 10 characters - including spaces, carriage-return, and line-feed characters. Refer to the format tables in paragraph 3.11.2 for details

43、. 2.9 ENVIRONMENT The Digibridge can be operated in nearly any environment that is comfortable for the operator. Keep the instrument and all connections to the parts under test away from electromagnetic fields that may interfere with measurements. Refer to the Specifications at the front of this man

44、ual for temperature and humidity tolerances. To safeguard the instrument during storage or shipment, use protective packaging. Service personnel refer to Section 5. When the Digibridge is mounted in a rack or other enclosed location, make sure that the ambient temperature inside the rack does not ex

45、ceed the limits specified under Environment in the Specifications at the front of this manual, and that air can circulate freely past all air inlet and outlet vents. INSTALLATION 2-13 3.1 BASIC PROCEDURE . 3-1 3.2 CONNECTING THE DUT. 3-4 3 .3 MEASUREMENT PARAMETERS, RESULTS DISPLAYS, OUTPUTS 3 -12 3

46、.4 PRINCIPAL TEST CONNDITIONS. 3-17 3 .5 MEASUREMENT TIME AND MEASUREMENT RANGES. 3 -18 3.6 ACCURACY. 3-22 3.7 BIAS FOR THE DUT . 3-24 3.8 BIN SORTING AND GO/NO GO RESULTS . 3-26 3 .9 KEYBOARD LOCK , FUNCTION MAP AND INTERROGATIONS 3 -33 3.10 OPERATION WITH A HANDLER . 3- 35 3.11 DATA OUTPUT AND/OR

47、PROGRAMMING VIA IEEE-488 BUS 3-36 3.12 SAMPLE IEEE PROGRAMS. 3-50 3 .13 SELF CHECKS AND FAILURE DISPLAYS (ERROR CODES) 3 -51 3.1 BASIC PROCEDURE 3.1.1 General For initial familiarization with the Digibridge RLC tester, follow this procedure carefully. After that, use this paragraph as a ready reference and refer to later paragraphs in this section for details. Co