1689 Precision Digibridge 电路图.pdf

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1、1689/1689M Precision RLC Digibridge(R) Instruction Manual Foml1689-0120-06/D2 (C)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 information

2、al purposes only and is subject to change, without notice. QuadTech assumes no responsibility for any error 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

3、 Operation -Section 3 Theory -Section 4 Service and Maintenance -Section 5 Parts Lists and Diagrams -Section 6 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 700011. Instruction Manual Changes (continued) Page 5-41 -Table 5-7, Capacitance Accuracy Checks .QDR Display Max col

4、umn corrected as follows: Nominal Value QDR Max 10 pF6100 ppm 100 pF2500 ppm 1500 pF700 ppm 1500 pF1000 ppm 1500 pF1700 ppm 6400 pF500 ppm 10 nF500 ppm 25 nF500 ppm 25 nF800 ppm 25 nF1500 ppm 100 nF500 ppm 200 nF600 ppm 400 nF600 ppm 400 nF900 ppm 400 nF1600 ppm 1000 nF600 ppm Page 6-2 -Figure 6-2,

5、1689 Rear View Rear view should show new power supply assembly (PN 700011) without line voltage switch. Page 6-3 -Mechanical Parts List for 1689, Rear Items 4 through 7 (power connector, fuse extractor post and line voltage switch and cover) deleted on new power supply assembly. Page 6-4 -Figure 6-2

6、(A), 1689M Rear View Rear view should show new power supply assembly (pN 700011) without line voltage switch. Page 6-5 -Mechanical Parts List for 1689M, Rear Items 3 through 6 (power connector, fuse extractor post, line voltage switch and cover) deleted on new power supply assembly. Page 6-15 RLC di

7、fference: same as R, L, or C. If any of these quantities is negative, the NEG RLC indicator light is lit. vii TABLE A GR1689 MEASUREMENT RATE TEST FREQUENCY MEASUREMENT RATE 12 Hz 100 Hz 120Hz 1 kHz 10 kHz 100 kHz SLOW 875 ms 940 ms 940 ms 970 ms 930 ms 930 ms MEDIUM 670 ms 130 ms 185 ms 200 ms 190

8、ms 190 ms FAST 670 ms 125 ms 110 ms 80 ms 75 ms 70 ms MAX IMUM 670 ms 110 ms* 100 ms* 40 ms 34 ms 33 ms Notes:1. If the high-speed option is not used, add 19 ms for MAXIMUM, or 38 ms for SLOW, NEDIUM or FAST measurement. 2. If the display is value, delta%, or deltaRLC, add 6 to 10 ms. 3. If data is

9、output via the IEEE Bus., add 6 to 12 ms. 4. For ACQ, subtract 22 ms for SLOW, MEDIUM or FAST and 12 ms for MAXIMUM. TABLE B GR1689M MEASUREMENT RATE TEST FREQUENCY MEASUREMENT RATE12 Hz100 Hz120 Hz1 kHz10 kHz100 kHz SLOW 875 ms 920 ms 920 ms 950 ms 920 ms 920 ms MEDIUM 670 ms 120 ms 170 ms 180 ms 1

10、70 ms 170 ms FAST670 ms105 ms90 ms65 ms55 ms55 ms MAXIMUM 660 ms 101 ms* 86 ms* 32 ms 22 ms 22 ms Notes: 1. If the high-speed option is not used, add 12 ms for MAXIMUM, or 24 ms for SLOW, MEDIUM or FAST measurement. 2. If the display is value, delta% or deltaRLC, add 3 to 5 ms. 3. If data is output

11、via the IEEE Bus, add 3 to 6 ms. 4. For ACQ, subtract 11 ms for SLOW, MEDIUM or FAST and 6 ms for MAXIMUM. * These times can be shortened by 14 ms with reduced accuracy using the quick acquisition routine. The measurement times are obtained with use of the high-speed measurement option, continuous m

12、easurement mode, bin number display/handler output, and without IEEE-Bus data output. For other conditions, refer to the table notes. If the measurement mode is triggered, programmed delay (settling time), if any, should be added. Normal power up conditions included a programmed delay of 7/f to 12/f

13、 ms depending upon measurement rate. This delay can be programmed to zero or to any value up to 100 sec. Test connections can be broken (handler indexing can begin) as soon as data acquisition is complete (ACQ line low on handler interface). See Note 4 in tables. i x Measurement Modes Two test modes

14、 are available: CONTINUOUS and TRIGGERED. The CONTINUOUS mode makes successive measurements continuously, updating the display after each measurement. TRIGGERED measurements are initiated by the START button, or remotely from the IEEE bus or from the Handler Interface, and the measurement result is

15、displayed until the next measurement is started. Average The AVERAGE of any number of measurements from 1 to 255 may be made as desired in either of the two MEASURE MODES. In the TRIGGERED mode, the running average is displayed and the final value held until the START button is again depressed. In t

16、he CONTINUOUS mode, only the final value is displayed. Test Voltage The RMS test voltage is selectable from 5 mV to 1.275 V in 5 mV steps. The accuracy is: (5% + 2 mV) (1 + .001 f 2) where f = frequency in kHz. This voltage may be applied behind a source impedance (which depends on the range) in whi

17、ch case the selected voltage is the maximum that will be applied and the voltage will be less at the low impedance end of each range. The voltage may be applied also behind 25 ohms using the CONSTANT VOLTAGE function in which case the applied voltage will be constant except when low impedances are m

18、easured. Delay A delay of from 1 to 99999 ms may be added to allow for settling of external switches and to permit a wider selection of measurement rates. DC Bias An internal bias of 2 V may be applied to capacitors under test by means of the INT BIAS key. An external bias of up to 60 VDC may be app

19、lied to capacitors under test using a panel switch. The applied current should be limited to 200 mA. The instrument is protected from damage from charged capacitors with a stored energy up to 1 joule at 60 volts or less. Protection from higher voltages may be provided by external components. Zeroing

20、 Open: A simple OPEN operation removes the effects of stray capacitance and conductance of the internal test fixture or any other test fixture or cable. Short: A similar SHORT zeroing operation removes the effects of series resistance and inductance. DUT Connections The 1689 has a built-in test fixt

21、ure that will accept radial or axial components. The 1689M has BNC connectors for attachment to a wide variety of measurement accessories. Four terminal (Kelvin) connections are made to the device under test. The instrument ground is guard for three-terminal measurements. x Keyboard Lock A combinati

22、on of keyboard entries makes the keyboard inactive. Special Functions Several special features may bl;: :selected. These include: Direct range setting Range extension Choice of integration time Blanking of lesser digits Signal Reversal to reduce hum pickup effects Selection of the median value of th

23、ree measurements A routine that reduces transient delays when bias is applied Automatic parameter selection Quick acquisition routine IEEE-488 Bus/Handler Interface Card (1658-9620) IEEE-488 Bus (J2 on rear panel with option) All front panel functions are programmable from the bus. All RLC, DQ, and

24、bin data are available as output to the bus. Output data format: ASCII or Binary. The following functions, per IEEE-488, have been implemented: AHIAcceptor Handshake (Listener) SHI Source Handshake (Talker). T5 Talker with normal and talk-only modes (for systems without a controller), switch selecta

25、ble on rear panel. L4 Listener. SRI Service Request (to request service when measurement is complete and the instrument is not addressed to talk). RL2 Remote/Local (no local lockout, no return-to-local switch). PPONo par all e 1 po 11 . OC1 Device clear. DT1 Device Trigger (to start measurement). CO

26、 No controller functions. Handler Connections (JI rear panel with option) 1. Outputs, Active low: (Open collector drivers rated at 30 V max. Each will sink 16 mA at 0.4 V. External power and pull-up resistors required). Bin 0 through bin 9 (10 lines) -Sorting outputs. ACQ OVER (1 line)-indicates end

27、 of data acquisition. Component may be removed (see TEST TIME). EOT (1 line)-indicates end of test. Bin No. is valid. 2. Input, Active low: (0 V VI 0.4 V, + 2.5 V Vh 1 us, and (if START is not debounced) a-c the settling time or programmed delay. For single measurements, the DUT can be disconnected

28、after e. The selected BIN line goes low at f; the other BIN lines stay high. For MEDIAN and/or AVERAGE measurement routines, ACQ OVER goes low (e) at the end of the last measurement. 2.7.3 Timing Figure 2-3. Refer to the accompanying figure for timing guidelines. Notice that START must have a durati

29、on of 1 us (minimum) in each state (high and low). If START 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 or the programmed delay time after the first transition to high,

30、 the measurement time may increase substantially. For an explanation of settling and delay time, refer to paragraph 3.5.3. INSTALLATION 2-7 Measurement starts at time d, which is essentially the same as time b or c; measurement is completed at g. (The START signals are expanded for clarity.) Interva

31、l a-e, during which the DUT must remain conllected for data acquisition, is considerably shorter than the total measurement time a-g. The DUT can be changed after e (indexing on ACQ, to save time) or after g (indexing on EOT, for a simpler test setup), as explained below. After the calculation inter

32、val 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 assignment). ACQ OVER, the selected BIN line, and EOT then stay low until the next start command. The time required for mea

33、surement depends on whether you have the high-speed measurement option, on test conditions, programmable values, and operating selections. Interval a-e can be less than 15 ms; the cycle ag can be less than 40 ms; refer to paragraph 3.5 for details. Set up the handler either of two ways: indexing on

34、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. Indexing on EOT, Set up the handler to respond to the EOT signal from the Digibridge, which occurs at the end of test, when the b

35、in 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 entered for nominal value to enable generation of the EOT signal

36、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 remove the DUT from the test fixture and replace it with another DUT

37、, 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 the handler. Indexing on ACQ results in higher measurement rate th

38、an indexing on EOT. Be sure the TALK switch is set to TALK ONLY, if the IEEE-488 bus is not used. 2-8 INSTALLATION Figure 2-4. Block diagram of a generalized system interconnected by the 16-signal- line bus specified in the IEEE Standard 488. Reprinted from Electronics, November 14, 1974; copyright

39、McGraw-Hill, Inc., 1974. 2.8 IEEE-488 INTERFACE (OPTION) 2.8.1 Purpose Figure 2-4. If you have either interface option, you can connect this instrument to a printer or into a system (containing a number of devices such as instruments, apparatus, peripheral devices, and generally a controller or comp

40、uter) 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 detail the purposes of the signals at the IEEE-488 INTERFACE connector at the rear panel o

41、f 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, N. J. 08854. To make connection to a single device like a printer, use a IEEE-488 cabl

42、e, 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 a diagram of a hypothetical system. A full set of connections is 24 (16 signals plus

43、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 part number 2024/1 is for a I-meter-Iong cable.) INSTALLA TION 2-9 This instrument will

44、 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 sllited for use in a system that has a controller or computer to manage the data flow. The handshake routine assures that the active ta

45、lker 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 110 controller and no other talker. Either mode provides measurement results to the active listen

46、ers in the system. 2.8.2 Interface Functions 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

47、 absence of a capability. SHI, source handshake (talker) AHI, acceptor handshake (listener) T5, talker (full capability, serial poll) L4, listener (but not listen-only) SRI, request by device for service from controller RL2, remote control (no local lockout, no return-to-local switch) PP0, no parall

48、el poll DC1, device clear DT1, device trigger (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 se

49、ttled and all listeners are ready before 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. 2-10 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. 2.8.3 Signal Ide