1689_im 电路图.pdf

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1、1689/1689M SERIES Precision RLC Digibridge User and Service Manual PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT Copyright 2006 IET Labs, Inc. 1689/December 2006 TEL: (516) 334-5959 (800) 899-8438 FAX: (516) 334-5988 IET LABS, INC. formerly manufacturer by GenRad 534 Main Street, Westbury, NY 11590

2、 RadioFans.CN 收音机爱 好者资料库 PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT TEL: (516) 334-5959 (800) 899-8438 FAX: (516) 334-5988 534 Main Street, Westbury, NY 11590 IET LABS, INC. RadioFans.CN 收音机爱 好者资料库 iii WARRANTY We warrant that this product is free from defects in material and workmanship and, wh

3、en properly used, will perform in accordance with applicable IET specifications. If within one year after original shipment, it is found not to meet this standard, it will be repaired or, at the option of IET, replaced at no charge when returned to IET. Changes in this product not approved by IET or

4、 application of voltages or currents greater than those allowed by the specifications shall void this warranty. IET shall not be liable for any indirect, special, or consequential damages, even if notice has been given to the possibility of such damages. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANT

5、IES, EXPRESSED OR IMPLIED, INCLUD- ING BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTIBILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. RadioFans.CN 收音机爱 好者资料库 vii WARNING OBSERVE ALL SAFETY RULES WHEN WORKING WITH HIGH VOLTAGES OR LINE VOLTAGES. Dangerous voltages may be present inside this instr

6、ument. Do not open the case Refer servicing to qulified personnel HIGH VOLTAGES MAY BE PRESENT AT THE TERMINALS OF THIS INSTRUMENT WHENEVER HAZARDOUS VOLTAGES ( 45 V) ARE USED, TAKE ALL MEASURES TO AVOID ACCIDENTAL CONTACT WITH ANY LIVE COMPONENTS. USE MAXIMUM INSULATION AND MINIMIZE THE USE OF BARE

7、 CONDUCTORS WHEN USING THIS INSTRUMENT. Use extreme caution when working with bare conductors or bus bars. WHEN WORKING WITH HIGH VOLTAGES, POST WARNING SIGNS AND KEEP UNREQUIRED PERSONNEL SAFELY AWAY. CAUTION DO NOT APPLY ANY VOLTAGES OR CURRENTS TO THE TERMINALS OF THIS INSTRUMENT IN EXCESS OF THE

8、 MAXIMUM LIMITS INDICATED ON THE FRONT PANEL OR THE OPERATING GUIDE LABEL. 700011. Instruction Manual Changes (continued) Page 5-41 -Table 5-7, Capacitance Accuracy Checks .QDR Display Max column corrected as follows: Nominal Value QDR Max 10 pF6100 ppm 100 pF2500 ppm 1500 pF700 ppm 1500 pF1000 ppm

9、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, 1689 Rear View Rear view should show new power supply assembly (PN 700011) without line voltage switch. Page

10、 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(A), 1689M Rear View Rear view should show new power supply assembly (pN 700011) without line voltage switch

11、. 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 difference: same as R, L, or C. If any of these quantities is negative, the NEG RLC indicator light is lit. vi

12、i 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 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 Note

13、s: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 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

14、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 170 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.

15、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 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. *

16、 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 measurement mode, bin number display/handler output, and without IEEE-Bus data output. For other conditions,

17、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 ms depending upon measurement rate. This delay can be programmed to zero or to any value up to 100 sec. Tes

18、t 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 are available: CONTINUOUS and TRIGGERED. The CONTINUOUS mode makes successive measurements continuously, up

19、dating 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 displayed until the next measurement is started. Average The AVERAGE of any number of measurements from 1 to

20、 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 the CONTINUOUS mode, only the final value is displayed. Test Voltage The RMS test voltage is selectable from

21、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 which case the selected voltage is the maximum that will be applied and the voltage will be less at the low imp

22、edance 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 measured. Delay A delay of from 1 to 99999 ms may be added to allow for settling of external switches and to

23、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 applied to capacitors under test using a panel switch. The applied current should be limited to 200 mA. The ins

24、trument 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 Open: A simple OPEN operation removes the effects of stray capacitance and conductance of the internal test

25、 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 fixture that will accept radial or axial components. The 1689M has BNC connectors for attachment to a wide varie

26、ty 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 combination of keyboard entries makes the keyboard inactive. Special Functions Several special features may bl;: :sel

27、ected. 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 three measurements A routine that reduces transient delays when bias is applied Automatic parameter selection

28、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 bin data are available as output to the bus. Output data format: ASCII or Binary. The following functions, p

29、er 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 selectable on rear panel. L4 Listener. SRI Service Request (to request service when measurement is complete and the

30、 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 No controller functions. Handler Connections (JI rear panel with option) 1. Outputs, Active low: (Open coll

31、ector 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 of data acquisition. Component may be removed (see TEST TIME). EOT (1 line)-indicates end of test. Bin No.

32、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 after e. The selected BIN line goes low at f; the other BIN lines stay high. For MEDIAN and/or AVERAGE measu

33、rement 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 duration of 1 us (minimum) in each state (high and low). If START is provided by a mechanical switch without debou

34、nce 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, the measurement time may increase substantially. For an explanation of settling and delay time, refer to pa

35、ragraph 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.) Interval a-e, during which the DUT must remain conllected for data acquisition, is considerably shorter than the to

36、tal 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 interval e-f, measurement results are available for sorting, i.e., one of the BIN lines goes low. A few micro-sec

37、onds 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 measurement depends on whether you have the high-speed measurement option, on test conditions, programmable val

38、ues, 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 EOT or indexing on ACQ, as follows. The handler must supply a signal (here called start next measurement) wh

39、en 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 bin assignment is available for sorting. Set up the Digibridge to receive its START signal from the handlers

40、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 and indication by the GO/NO-GO lights; see paragraphs 3,8.3, 3,8,4. Indexing on ACQ. Set up the handler to r

41、espond 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, while the Digibridge is calculating the result, In addition, set up an interface that provides a START sig

42、nal 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 than indexing on EOT. Be sure the TALK switch is set to TALK ONLY, if the IEEE-488 bus is not used. 2-8 INSTAL

43、LATION 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 McGraw-Hill, Inc., 1974. 2.8 IEEE-488 INTERFACE (OPTION) 2.8.1 Purpose Figure 2-4. If you have either interf

44、ace 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 computer) in which each component meets IEEE Standard 488-1978, Standard Digital Interface for Programmable Inst

45、rumentation. 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 of this instrument. NOTE For copies of the Standard, order IEEE Std 488- 1978, IEEE Standard Digital Interfac

46、e 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 cable, which fits the rear-panel connector labeled IEEE- 488 INTERFACE. For larger systems, each device is conne

47、cted 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 shield and ground returns), as tabulated below and also in the Standard. Suitable cables, stackable at each

48、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 function as either a TALK/LISTEN or a TALK ONLY device in the system, depending on the position of the TALK

49、 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 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 110 controller and no other talker. Either mode provides measurement results to the active listeners in the system. 2.8.2 Interface Functions Fig