00021 084

of Ls or Cs of Ls or Cs of measd Rs reactance and resistance, respectively * Xdut and Rsdut represent the DUT's series ** Aid error is significant only for extension beyond normal DUT interface, where the system software applies compensation. 3.6.8 Use of Signal Reversing (Special Function) for Tests at Power Frequencies The special signal reversing function is primarily for use whenever the test frequency is 60 or 120 Hz (if your power frequency is 60 Hz) or whenever it is 50 or 100 Hz (if...

1 01j Mo

* Do N Yr set the swi tch to 11111, because a talk address of - would be confused with an untalk comnand, and a I isten address of with an unl isten comnand. (ASCII code for - is 1 011 III and for is 0 III Ill.) In the above example, the remote message codes MLA and MTA are X0100011 and X100001 J , respectively. Thus the listen address and the talk address are distinguished, although they contain the s me set of device-dependent bits, which you set into S2. Data Output. Data (results of...

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...

310 Special Functions

Most of the special functions are described in more detail in other parts of the manual. Refer to Table 3-9 for a brief summary of the special functions and how to operate the SPECIAL key. Programming of special functions can be done only in ENTER function. 1. Setting Autorange (normal) the Range Hold range 1 Hold range 2 Hold range 3 Hold range 4 No output (max meas Bin numbers only QPR results QDR and bin RLC results RLC and bin RLC and qpR bin numbers full data ful1 data on FAIL ful1 data on...

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...

334 Units Multipliers and Blank Displays

Units of R, L, and C are determined entirely by your selection of parameter. Units multipliers are fixed by parameter, range, and frequency, except that selection of delta changes the RLC display to a percentage. See Table 3-2. Units of D and Q are dimensionless and are expressed as a decimal ratio, without multiplier --unless you select DQ IN PPM, in which case D or Q is expressed in parts per million (see below). To obtain D or Q in percent, from the regular display, move the decimal point...

335 DQ in PPM

The Digibridge can easily be programmed to display the secondary test result --when it it either D or Q --in parts per million. To choose this display, press SHIFT DQ in PPM so that the DQ IN PPM indicator is lit. To disable this option, repeat the same keystrokes so that the indicator is NOT lit. Units of D and Q in PPM are dimensionless and are expressed as a decimal ratio, with the multiplier of 1,000,000 understood. To obtain D or Q in percent, from the DQ in PPM display, place a decimal...

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...

341 Test Frequency

Power-up frequency is 1 kHz, unless the keyboard has been locked with some other choice. There are 503 available frequencies, as detailed below. Selection. To select the test frequency, simply key in the desired frequency as follows, and the Digibridge will automatically obtain the nearest available one. a. Select ENTER with the FUNCTION key. b. Enter the desired frequency in kilohertz and press SHIFT FREQUENCY in sequence, as follows. For example, to select 500 Hz, press Up to 6 digits and...

342 Test Voltage

The power-up test voltage is 1.0 volt rms, unless the keyboard has been locked with some other choice. There are a total of 255 choices .005 to 1.275 V in increments of .005 V. To program the test voltage a. Select ENTER with the FUNCTION key. b. Enter the desired voltage in volts and press SHIFT VOLTAGE , in sequence as follows. For example, to select 750 m V rms, press The accuracy of the programmed source voltage is + - (5 + 2 mV) (1 + .001 j2) , where f value of test frequency in kHz. The...

343 Constant Voltage Source

If it is important to measure the DUT at a particular test voltage, then select the constant-voltage feature as follows. Press so that the CONSTANT VOLTAGE indicator is lit. The Digibridge now retains a source resistance of 25 ohms for all ranges. The voltage is constant for any DUT impedance significantly larger than 25 ohms. An example is given in the preceding paragraph. Choosing this feature causes a reduction in measurement accuracy by a factor of three, as accounted for by Kcv in the...

344 Constant Current Source

To provide a constant-current source for any measurement, select and hold a range such that the source resistance is much larger than the DUT impedance. (See table of ranges, above.) Thus a. Select ENTER function with the FUNCTION key. b. Select and hold a range as follows (See also paragraph 3.10.) For source resistance 97.4 kilohms (range 1) press 1 SHIFT SPECIAL 1 For source resistance 6.4 kilohms (range 2) press 2 SHIFT SPECIAL 1 For source resistance 400 ohms (range 3) press 3 SHIFT...

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...

3510 Measurement Time Summary Figure

To summarize the relationships of measurement time to a representative set of the many possible test conditions and operating selections, refer to Table 3-4 and the accompanying figure. Notice that the table applies to the 1689 Digibridge. Below the table are corrections that indicate about how much less time is required by the 1689M Digibridge. Tab Ie 3-1 1689 D1GIBRID TYPICAL NtASLJREYENT TfVES VS FRBQUFKY AM3 MEASURE RATE PGR DIGIBRIDGE WITH HIOi- PEED MEASURIM T OPTION -

352 Measure Rate Selection at Keyboard

Choose one of 3 basic measurement rates with the MEASURE RATE key SLOW, MEDIUM, or FAST. The continuous-mode rates are respectively about 1,5, and 12 measurements per second, if the other test conditions and programmable selections are left at normal power-up defaults, for the Digibridge with high-speed option. The tradeoff is speed vs accuracy. The Digibridge will make a more precise and accurate measurement at a slower rate. For the above conditions, in very simplified terms, the basic...

353 Settling Time or Programmed Delay in Triggered Measure Mode

For accurate measurements, it is often helpful to have a time delay between the START signal and the beginning of the first voltage measurement within the process of data conversion. Because such a delay allows time for switching transients to settle, and because more time is required for low test frequencies, the Digibridge normally incorporates settling time as follows. If measure mode is CONTINUOUS, settling time zero, programmed delay is disabled. If measure mode is TRIGGERED, with measure...

354 Measure Mode and Display Selection Effects on Measurement Time

Selection of TRIGGERED mode introduces a settling time or delay between the START signal (wllich is necessary in this mode) and the beginning of data acquisition. Refer to paragraph 3.5.3, above. Measure Mode CONTINUOUS. Selection of CONTINUOUS measure mode eliminates the delay described above. Notice that in continuous mode, the measurement being made when the DUT is connected to the Digibridge is erroneous. Subsequent measurements have the benefit of any effective...

355 Integration Time Factor a Special Function

The length of time that the Digibridge spends integrating analog voltages in the process of data acquisition can be varied by programming a number called the integration-time factor, if the measure rate is selected to be FAST or MEDIUM. In general, programming the I- T factor to a larger value allows the Digibridge to integrate over more cycles of the test signal, thus increasing the measurement time and enhancing the accuracy. (If the measure rate is SLOW, integration time is automatically...

357 Time Required tor Obtaining Median Values and Averaging

Accuracy can be enhanced, at the cost of increased measurement time, by either or both of these methods. The time considerations and a brief instruction for selecting each method (while in the ENTER FUNCTION) are given here. Median Value. This measurement time is somewhat less than triple the single measurement time, because three nearly complete measurements are made, from which the Digibridge selects the median for final results. To be more specific, each median-value measurement requires...

359 Effect of Selecting a Low Test Frequency on Measurement Time

Selection of a test frequency near or below 0.1 kHz affects measurement time in two ways both settling time and data acquisition time depend on the period of the test signal. (Selection of test frequency near and above 1 kHz has little effect on measurement time, particularly if the integration time factor is left at default or set to a larger value.) In general, measurement time includes the following two terms, which are additive. (Note f is equal to the test frequency in kHz.) Settling time...

36 Accuracy The Limits Of Errors 361 General

Refer to the Specifications, at the front of this manual. The specifications apply at an ambient temperature of 23 degrees C (unless recalibration has been done at some other temperature), in low humidity, if the OPEN and SHORT zeroing procedures have been executed properly (paragraph 3.1), and the quick-acquisition feature is NOT selected. Typical accuracy is described below, for convenience in obtaining a birds-eye view of the way it relates to the principal test conditions, instrument...

363 Averaging to Improve Accuracy Figure 310

The accuracy of measuring each DUT can be enhanced automatically by the Digibridge if you program it to make several measurements and average them before reporting the final result. Thus, errors due to electrical noise and other effects that are just as likely to make the measurement too high as too low are largely canceled. (This is true regardless of the display selection, VALUE, BIN NO., etc.) Of course, the time required to complete a measurement with averaging set to 10 (for example) is 10...

364Selection of Median Value for Better Accuracy

The Digibridge can be programmed to make measurements in one or more groups of three and take for results the median value in each group. If you also select averaging (of 5 for example), the median values of (5) groups will be averaged. Examples of uses for the median-value capability are given below. If the median-value capability is enabled, the Digibridge makes three measurements, discards the highest and lowest results, and uses the median result for further calculations (if any), such as...

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...

371 Internal Bias

To measure capacitors with the internally available 2-volt dc bias voltage applied, use the following procedure. (The FUNCTION can be either MEASURE or ENTER.) a. Press SHIFT INT BIAS keys so that the BIAS ON indicator is lit. NOTE This indication, for internal bias, is somewhat dimmer than the other keyboard indicators. b. The special shorting routine is recommended (see para 3.7.3) enable it as follows. Select ENTER function and then press 2 SHIFT SPECLAL 3 Select MEASURE function. c. Wait at...

372 External Bias

If bias is required at some other voltage than the 2- V internal bias, use external bias as described below. Be sure that the voltage is never more than 60 V, max. A current limiting voltage supply is recommended set the limit at 200 mA, max. Be sure that the bias supply is floating DO NOT connect either lead to ground. Generally the external circuit must include switching for both application of bias after each DUT is in the test fixture and discharge before it is removed. A well-filtered...

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...

382 Sorting Methods

The figures illustrate 2 basic methods of sorting nested and sequential. Nested limits are the natural choice for sorting by tolerance around a single nominal value. The lower numbered bins must be narrower than the higher numbered ones. Symmetrical limit pairs are shown but unsymmetrical ones are possible. (For example, range AB could be assigned to bin 3 and range FG to bin 4 by use of unsymmetrical limit pairs in these bins.) Sequential limits, on the other hand, are the natural choice for...

383 Limit Entry Procedure

To enable comparisons (unless the keyboard is locked), first enter limits as follows. This procedure makes use of limit entry keys, (at the left of the SHIFT key), with gray (or yellow) labels that apply only when the selected FUNCTION is ENTER. a. Press DISPLAY key to select VALUE. Press FUNCTION key to select ENTER. b. To enter a single QDR limit (always bin 0) press the parameter key (such as Cs D ) appropriate to DUT. To change range and unit multipliers, press the same key repeatedly....

384 Verification or Nominal and Limit Values

While the function is ENTER, the exact values entered into the Digibridge can be seen by either of 2 methods, as follows. During the Entry Process. A confirming display is automatically provided immediately after the final keystroke of each entry step. For example, after the NOM VALUE keystroke, the entered value appears on the RLC display. After the BIN NO and number keystrokes, the actual limits of RLC value (not percentages) appear across the full display area upper limit on the regular RLC...

385 Examples of Limit Entry

To enter a set of nested limits, operate the keyboard as described below for the example of inductors having Q > 21, Ls 33 mH + - 0.35 , + - 1 , + - 5 , +7 -9 . a. With FUNCTION key, select ENTER. b. With EQUIVALENT CIRCUIT key, select SERIES. c. With parameter key Ls Q , select RLC units mH. d. Enter Q limit thus 2 1 SHIFT BIN No. 0 0 . e. Enter nominal RLC value 3 3 SHIFT NOM VALUE . f. Set bin 1 limits . 3 5 SHIFT BIN No. 0 1 . g. Set bin 2 limits 1 SHIFT BIN No. 0 2 . h....

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...

393 Summary of Interrogations

Certain status (and results) information is indicated automatically on the display panels. For example Indicators below RLC display parameter and or units of measurement. All units and indicators unlit --display is either bin no. or ratio. NEG RLC --negative L or C or (for displays of delta or deltaRLC) measured value less than stored nominal. NEG QDR --capacitive resistor or apparently negative loss factor. RANGE HELD --autoranging is disabled. CONST VOLT --source resistance held to 25 ohms...

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...

For 1889M

1689-9603 (tweezers, with integral cable connected directly to instrument) 1689-9602 (BNC cable, with 1689-9600 or 1689-9605 remote test fixture) 1657-9600 (with 1689-9602 BNC cable at instrument and 1689-9600 9605 fixture, has remote banana plugs) 1688-9600 (with 1689-9602 BNC cable at instrument and 1689-9600 9605 fixture, has remote 874 connectors) * The formulas for Acm and Acmx contain x, which is 2(pi)fLc, where pi is 3.1416, where f is expressed in Hz, and inductance Lc is tabulated...

For C in nF R is in kilohms For C in uF R is in ohms

The decimal point is automatically positioned for maximum resolution (i.e., so that the first significant digit or the first zero after the decimal point is in the first position in the display) with a few exceptions, as listed below. Of course, displays on low underrange or low extension of a held range may have a number of necessary zeros to right of the decimal point (and therefore reduced number of significant digits compared to the display area) because uni and...

Iiiii

If RLC data are NOT needed, the data format uses 5 bytes as follows. If both RLC and BIN data are not needed, the OTHER byte is omitted. Name STATUS < )R, e Q DR, mantissa OTHER Byte Number byte 1 byte 2 byte 3 byte 4 byte 5 j If only BIN data are needed, the data format uses only 2 bytes, as follows. If RLC, QDR, and BIN data are all NOT needed, no data output occurs. The RLC,e byte (except for bit 7) conveys the RLC exponent (2s complement). The RLC,mantissa bytes (all 16 bits) convey the...

Instruction Manual Changes continued

The 1689 is shipped with a standard U.S. power cord, QuadTech PN 4200-0300 (with Belden SPH-386 socket or equivalent, and 3 wire plug conforming to IEC 320) or an approved international cord set. Make sure the instrument is only used with these or other approved international cord sets, which ensures the instrument is provided with connection to protective earth ground. In all installations the instrument should be positioned with consideration for ample air flow to the side and rear panel...

ISet bin 4 limits [l[[0[[[SHIFT[BIN No[04 j Set bin 5 limits [2[[l[[[SHIFT[BIN No[0[5 k Set bin 6 limits

NOTE For any bin the less negative or more positive percentage must be entered first as shown clearly in steps f and k. Because there are no overlaps, there will be no default assignment to the lower-numbered bin. Binnumber sequence is immaterial. 3.8.6 Notes on Limit Entries in General For additional detail, refer to the condensed instructions on the reference card under the Digibridge, and to the following notes. Frequency. It is NOT necessary to select the test frequency first. Comparison...

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...

Me a s Test Freq kHiTest Freq kiii

Rate .i 1 JO 3 00 .i i 10 100 Max115 42 36 35 1 23 50 44 43 ms FAST 124 79 72 71 132 87 80 79 ms IvfD 133 205 189 185 141 213 197 193ms SLQV 958 960 950 9 15 965 968 958 923ms Di splay BIN DiapUy VALUE Test Freq (kHi) Test Freq (kHz) kHz 0 1 I 10 100 0.1 1 10 10 H*Ma L 8 5 19 FAST 19 4 8S IVEC 233 2L& SLOW 1078 972 37 35 193 57 73 71 202 94 J 90 I 85 241 223 951 915 1086 980 4 5 43 ms 81 79 ms 1& 8 rJSros 959 923ms FOR DIGIBRIDGE WITHOUT HI 1-SPEED K ASUREN-EVT OPTION

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...

PQK 168 Sm Di Gibft Idge Withcut High Spefd JvEvsuret Option

Subtract about 1.7 ms from Max Meas Rats entries in corresponding 16S9 lablt, above . Subtract about 31 ms from other Me as Rati entries ill corresponding 1689 table above , NOTE Table 3-4 differs slightly from the table of typical measurement times given in the Specifications at the front of this manual (and data in paragraphs 3.5.1,3.5.2,3.5.5), although the tables are reasonab y accurate. The differences underscore that these typical numbers are not specifications and that several test...

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...

R 625 ohms to 256 ki1 ohm L 1f mH to 4100f nH C 64f nF to 25f uF

General view of the tradeoffs between measurement time and accuracy. Each curve shows the tradeoff for one test frequency. Operating points are labeled according to the selected measure rate (FAST, MEDIUM, SLOW). All of these curves apply to the following conditions R, L, or C within basic ranges, D < < 1 or Q> > 1, display is BIN NO., test voltage > 1.0 V, constant voltage NOT selected, delay NOT programmed, measure mode is TRIGGERED, and the high-speed option is used...

Range Holding

Why Hold a Range' The moot important use of the range holding capability is to avoid range changes when the component is removed from the fixture when in the CONTINUOUS mode. With no component connected, the instrument will autorange to range 1. Thus, if range 1 is not selected when the component is in place, considerable time is loot by unnecessary autoranging. Another use of the range hold occurs when measuring components of the same nominal value whose actual values spread across the boundry...

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...

[5 H [shift [special [3

Table 3-9 (continued) SPECIAL FUNCTIONS Blanking a digits from RLC display and b digits from QDR display 5. Integra- Multiplies integration time by tion-Time factor f (0.25 to 6), normally 1 Factor Reducing f decreases accuracy and reduces measurement time. Increasing f does the converse. 6. Ra t i o No rma 1 displays Displays Ratio displayed (RLC only) nominal meas value 7. Man auto Manual selection of parameter Parameter Automatic selection of parameter Selection (R Q, L Q, or C D) default...

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.