11 Purpose

The two Digibridge(R) precision RLC testers, GR1689 and GR1689M, are microprocessor-controlled, automatic, programmable RLC measuring instruments that provide high accuracy, convenience, speed, and reliability at low cost. Limit comparison, binning, and internal bias are provided both test frequency and voltage are selectable. With an interface option, each Digibridge tester can communicate with other equipment and respond to remote control. The versatile, adaptable test fixture, lighted...

311 Operation With A Handler

If you have the interface option and have made the system connections to a handler (paragraph 2.7), the Digibridge operating procedure is as follows. a. Set up the handler either of two ways indexing on EOT or indexing on ACQ, as explained below. The handler must supply a signal (here called start next measurement) when it has completed connection of the DUT. Indexing on EDT. Set up the handler to respond to the EOT signal from the Digibridge, which occurs at the end of test, when the bin...

3122Talk Only Use for Data Output

This pertains to a relatively simple system, with the Digibridge outputting data to one or more listen only (IEEE-488 compatible) devices such as a printer. a. Set the TALK switch to TALK ONLY. b. Program the Digibridge to send out results automatically after each measurement. (Refer to paragraph 3.10.) The special commands for this purpose can be executed only in ENTER function, as follows. b. Program the Digibridge to send out results automatically after each measurement. (Refer to paragraph...

3123 Talk Listen Use for Remote Programming and Data Transfers

Observe the REMOTE CONTROL indicator light. If it is lit, there is no opportunity for manual operation (except switching EXTERNAL BIAS ON and OFF and use of the START button if manual start is enabled.) The displays may be observed then, but their content is controlled by the system controller, via the IEEE-488 bus. Details of test program preparation are beyond the scope of this manual. Refer to Table 3-18 for an example of message activity during a control sequence in which the controller...

337 Ratio Displays Virtual Range Extensions and Conductance Measurements via a Special Function

The Digibridge can easily be programmed to display the principal test result (RLC) in the form of a ratio instead of the actual measured value. The ratio is either (measured value stored nominal value) or the reciprocal of that. By suitable choice of the nominal value, you can obtain virtual range extensions for measurement of very large values or for fine resolution in measurement of very small values. One use of the ratio display capability is to obtain results in terms of a multiple of some...

35 Measurement Time And Measurement Ranges 351 General

Selection of MEASURE RATE (SLOW, MEDIUM, and FAST) obviously relates to measurement time, providing the user with an easily made choice. (The slower rates provide greater accuracy.) Programming a DELAY (typically because the normal settling time is insufficient for a particular handler or biasing routine) also obviously affects measurement time. In this paragraph, the many items that affect measurement time are explained. The measurement time (required to complete a measurement and display the...

366 Accuracy Enhancement by Special Attention to Short Circuit Inductance

The ratio display (paragraph 3.3.7) enables very high-resolution measurements of low inductance and high capacitance -even beyond the limits of normal RLC displays. If such measurements are planned, especially if the test frequency is high, the inductance of the short circuit used in the normal zeroing procedure should be considered. The short circuit provided by a wire inserted into the Digibridge test fixture (paragraph 3.1.3) has an effective inductance in series with its very low...

381 Introduction to Binning Sorting Based on Limit Comparisons

If a group of similar DUTs are to be measured, it is often convenient to use the limit-comparison capability of the Digibridge to categorize the parts. This can be done in lieu of or in addition to recording the measured value of each part. For example, the instrument can be used to sort a group of nominally 2.2-uF capacitors into bins of 2 , 5 , 10 , 20 , lossy rejects, and other rejects. Or it can assign DUTs to bins of (for example) a 5 series such as 1.8, 2.0, 2.2, 2.4, 2.7 uF, etc. The bin...

388 Bin Sum Information

If comparison (binning) is enabled, the Digibridge automatically keeps totals of the number of measurements assigned to each bin since power-up (or reset of the count to zero). The sums can be called up onto the display or sent out over the IEEE-488 bus. To make use of the bin-sum feature use these keystroke sequences. bin number at right. IEEE-488 bus > zero bin number at right. IEEE-488 bus > zero

389 Binning and Ratio Measurement Simultaneously

In order to bin-sort component parts whose values lie beyond the normal measurement range of the Digibridge, you must combine ratio measurement (paragraph 3.3.7) with limit comparisons and binning (paragraph 3.8). You should first become familiar with both ratio measurement and binning procedures because the combined procedure (as follows) can be somewhat tricky. Just as the display is a dimensionless number in ratio measurement, so the limit comparisons are made on dimensionless ratios in this...

39l Keyboard Lock

Locking the keyboard provides security against unintentional or unauthorized change in the keyboard selectable test conditions, as well as preserving them during the time that POWER is switched OFF. Indications of the unlocked or locked state are as follows Unlocked --several keyboard indicators lit. Locked --NO keyboard indicators lit, except possibly MEASURE, BIAS ON and or REMOTE CONTROL. To lock the keyboard, first select MEASURE function. Then, press the following keys deliberately. The...

Bin No assignment is not available

The set of commands used in remote programming is an input data code to which the instrument will respond as a talker listener, after being put into a remote-control mode via the bus (see Table 3-15) and addressed to listen to device-dependent command strings. Refer to Table 3-17. The programming command set includes all of the keyboard functions except switching external bias ON OFF and full recalibration, which are not remotely programmable. Keyboard functions are...

LQ CD yr CRQ D or R is positive Q D or R is negative see below

If the secondary measurement is negative --Q, D, or R as calculated by the Digibridge when selected parameter is L Q, C D, or C R --then there are t,.o likely possibilities. If the Q or D value (whichever is being displayed) is very sma.ll, a small (acceptable) calibration and or measurement error can lead to a negative result. (It should of course fall within the specified accuracy of the instrument.) Measurement error can be reduced by choice of measurement conditions, averaging, etc. Another...

Measure Mode Gout i nuous

Meas Test Freq (kHl) Test Freq (kHs) Kst( 0.1 1 10 100 0.1 10 100 FAST 159 111 107 106 167 122 115 114ms NED 168 340 224 220 1 76 248 233 228ms SiaV 993 905 985 950 1001 1003 093 958ms No entry for delay, When measure mode is CONTINUOUS p settling time is zero. No entry for d e y . hen measure mode is TRIGGERED, settling time is T, 10, 12 ms f defaults for measure rate FAST, XfD1, SL M , respect ive I y Trvli e r e 1 test freq in kila. Any programmed delay (can be 0 to 99999 nts) would replace...

Note

The GenRad line of Digibridge test fixtures, adaptors, and other accessories does continue to be improved and expanded. Inquire periodically at your local GenRad sales office for the latest information. An external test fixture is always required, because connection from the 1689M Digibridge to the DUT is provided via BNC cables (from connectors that can be positioned at either front or rear of the instrument, as described in Section 5). For general purposes, the recommended test fixture,...

Operation Section

NEASURE NT PARAMETERS, RESULTS DISPLAYS, OLttPOTS PRINCIPAL TEST OCMHTIONS 4iASUftEMTsT TTNE AND MEASUREvENT RANGES DIN SOMTNG AND GO ND- O RKSULTS KE> TOARD LOCK, FUTCTlCN MVP AND INTERR GATICNS OPERATION W1TH A H NDLER DATA OJTPLT AND Cfe PROCRAWTN VJA IEEE-4SS BUS . SELF CHECKS AND FAILURE DISPIAYS (EffiCR CODES) , For initial familiarization with the Digibridge(R) RLC tester, follow this procedure carefully. After that, use this paragraph as a ready reference and refer to later paragraphs...

Page 513 A Paragraph 551 Disassembly of 1689 Digibridge step e and f

Delete step e, there is no longer a protective cover. CAUTION note does not apply, the fan has been removed. Step f, the power supply is secured by only 4 screws rather than 5. Instruction Manual Changes (continued) Page 5-14 & Page 5-15 - Figure 5-3 & Figure 5-51 Power Supply Assembly * Power Supply Assembly shown, PN 1689-2005, has been replaced by Power Supply Assembly, PN 700011. Page 5-18 - A Paragraph 5.5.2, Disassembly of 16S9M Digibridge. step i> Access lo the bottom of the...

Principal Measurement Results

The principal Digibridge measurement will be presented on the left (RLC) part of the display panel in one of four ways VALUE, deltaRLC, delta , or BIN No., (only one way for any single measurement). VALUE, Selected by the DISPLA Y Key. This measurement provides two displays the principal one is RLC (resistance, inductance, or capacitance) and the secondary one is QDR (quality factor with R or 1, either dissipation factor or resistance with C). The VALUE selection is the power-up default and one...

Theory Series and Parallel Parameters Figure

An impedance that is neither pure reactance nor a pure resistance can be represented at any specific frequency by either a series or a parallel combination of resistance and reactance. The values of resistance and reactance used in the equivalent circuit depend on whether a series or parallel combination is used. Keeping this concept in mind will be valuable in operation of the instrument and interpreting its measurements. The equivalent circuits are shown in the accompanying figure, together...

Usa

Sales 800-253-1230 Service 978-461-2100 5.4 PERFORMANCE VERIFICATION 5.4.1 General This procedure is recommended for verification that the Digibridge is performing normally. No other check is generally necessary because this procedure checks operation of nearly all of the circuitry. If the Digibridge passes this performance verification, it is safe to assume that the instrument is functional. (However, to insure accuracy, refer to paragraph 5.8, Accuracy Verification.) All tests are done at 1...

Warranty

QuadTech warrants that Products are free from defects in material and workmanship and, when properly used, will perform in accordance with QuadTech's applicable published specifications. If within one (1) year after original shipment it is found not to meet this standard, it will be repaired, or at the option of QuadTech, replaced at no charge when returned to a QuadTech service facility. Changes in the Product not approved by QuadTech shall void this warranty. QuadTech shall not be liable for...

[ Rack Mxjnting

.2 Integral Test Fixture (Radial) 4 .3 Using Adaptors (Axial-Lead Dut) 5 .4 BNC Adaptors, Remote Fixture S .G Extender Cable (Banana Plugs) 10 .7 Effects of Cable Capacitances 11 .8 TVe enrs (Specie Test Fixture) 12 .2 Equiv Circuits (Series, Parai) 14 .3 Results PRINCIPAL Nf AfiLR& tNT 17 .4 Units, Mil 11 i p I i ers, Blank Disp IS .6 Digit Blanking (Special Funct) 21 ,7 Ratio Displays (Special Fumct) 21 3 4 PRINCIPAL TEST CONDITIONS . 3-23 1 Test Frequency 3 Con stant-Vo I tage S urce 25 4...

Ocmmnds Used In Programming Via Ieee488

MESSAGE ACTIVITY ON IEEE-488 BUS DURING A SIMPLE EXAMPLE OF REMDTE CONTROL By t e Me s s a g e * ATN Conine n t order line 1 (UNT) true Untalk all devices. 2 (UNL) true Unlisten all devices. 3** (MLA 3) true Set Digibridge (address 3) to listen. 4 (MEA n) true Set controller (address n) to talk. 5 G false Typical device-dependent message START. (See 6 0 false Table 3-17 for program conmands . ) 7 (UNL) true Unlisten Digibridge (must for measurement). Digibridge makes measurement, asserts SRQ...

Or

1 recommended IEEE-488 handler interface option retrofit 1658-9620 1 recommended Rack mount kit. (Digibridge front panel is always 1689-9611 accessible the BNC connectors for cable to test fixture can be mounted on either front or rear pan e I .) 1 recommended Remote test fixture (like the 1689-9600) also has 1689-9605 START bar, GO NO-GO I ights, which function only if Digibridge has an interface option. Use cables 1689-9602 (supplied with 1689M) and 1689-2400 (included with this fixture). 1...

365Accuracy Enhancement for Large or Small Impedances at Particular Frequencies

When measuring very large or small values of impedance, the Digibridge will provide much better accuracy than the specifications, if the OPEN and SHORT zeroing procedure has been recently repeated with test frequency set to the actual test condition. Examples of the accuracy that is typically obtained with measure rate SLOW, after using the actual test frequency when zeroing At 30 Hz, R 100 megohms + - 1 (range-l extension, a factor of 240 over Rmax) At 120...

Truth Table Of OovPacied Binary Fofmvt For OmPut Data

Rlc Series Block Diagram

Name STAHJS RLC, e RLC, mant i s sa QPR, e QDR, mantissa OIHER Byte Number byte 1 byte 2 byte 3 byte 4 byte 5 byte 6 byte 7 byte 8 76543210 Normal meas'mt 00 II I Overrange 101 Underrange 10 Inva1id meas' 111 Range 1 00 Range 2 j 01 j j j j j Range 3 j 10 j j j j j Range 4 11 Bin number 001 QDR amp bin no. j 011 j j j j j RLC amp bin no. j 101 j j j j RLC, C2PR, bin j 111 j j j j j RLC value is 0 RLC value i s - 11 gt R value is j j j 0 j j OPR va1ue i s - 11 Parameter L Q III 00 Parameter C D...

RANGES and Range Changing

Descriptions of ranges, range extensions, and decimal point control are explained below. Basic Ranges. The 4 basic ranges are numbered 1, 2, 3, 4, in order of decreasing impedance. Each basic range is approximately a factor of 16 wide. Refer to paragraph 3.4.2 for a table of ranges. The word upper as used below refers to increasing measured value which is the direction of increasing range number only if the principal measured parameter is capacitance . Similarly, the word lower as used below...

Genrad Qualtech Iet Digibridge Service Manual

IEEE-488 handler interface option retrofit plug-in . 1 recornnended Tweezers, for handl ing and measuring chip components with terminals on opposite aces. BNC connectors 127-cm 50-inch cable. Use with adaptor 1689-9601. 1 recornnended Kelvin CI ip Cable, or measuring large, low impedance components. Use with adaptor 1689-9601. 1 recornnended Extender cable for connection to parts handler, large or remote DOT, custom test fixture, etc. Length 100 cm 40 in . One end fits test fixture of...

Specifications

Measurement results may be displayed in four ways as selected by the keyboard 1 VALUE, 2 difference, 3 RLC difference, and 4 BIN NO. 1 The VALUE display can be one of four pairs of measured quantities Land Q, C and D, C and R, or Rand Q. The primary display L, C, or R has five digi of resolution and the secondary display D, Q, or R with C has four digits of resolution. 2 The difference display indicates the percent deviation of the measured L, C, or R value from a stored NOMINAL VALUE. The sign...

Instruction Manual Changes

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 v - Table of Contents Parts Lists and Diagrams - Section 6 Power supply assembly, board layout and schematic pages 6-15 amp 6-16 replaced by Power supply assembly part number 700011. Page xii - Specifications High-Speed Measurement Interface Option, Environment Power amp Mechanical Part Number for High-Speed...

Instruction Manual

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 www.quadtech.com The material in this manual is for informational 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.