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IET Labs 1910 User And Service Manual

Inductance analyzer
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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT
1910
Inductance Analyzer
User and Service Manual
Copyright © 2017 IET Labs, Inc.
Visit www.ietlabs.com for manual revision updates
1910 im/Oct 2017
www.ietlabs.com
IET LABS, INC.
Email: info@ietlabs.com
TEL: (516) 334-5959 • FAX: (516) 334-5988

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  • Page 1 ♦ ♦ PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT 1910 Inductance Analyzer User and Service Manual Copyright © 2017 IET Labs, Inc. Visit www.ietlabs.com for manual revision updates 1910 im/Oct 2017 www.ietlabs.com IET LABS, INC. Email: info@ietlabs.com TEL: (516) 334-5959 • FAX: (516) 334-5988...
  • Page 2 ♦ ♦ PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT www.ietlabs.com IET LABS, INC. Email: info@ietlabs.com TEL: (516) 334-5959 • FAX: (516) 334-5988...
  • Page 3 WARRANTY We warrant that this product is free from defects in material and workmanship and, when properly used, will perform in accordance with applicable IET specifi cations. 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.
  • Page 4 WARNING OBSERVE ALL SAFETY RULES WHEN WORKING WITH HIGH VOLTAGES OR LINE VOLTAGES. Dangerous voltages may be present inside this instrument. Do not open the case Refer servicing to qualifi ed personnel HIGH VOLTAGES MAY BE PRESENT AT THE TERMINALS OF THIS INSTRUMENT WHENEVER HAZARDOUS VOLTAGES (>...

  • Page 5: Table Of Contents

    Contents Warranty ......................7 Specifications ......................9 Accessories ......................11 Safety Precautions ....................15 Condensed Operating Instructions ................17 Installation and Power Up ................17 Selecting Test Conditions ................18 Zeroing ......................24 Connection to Device Under Test ..............30 Initiating Tests ....................30 Introduction - Section 1 Unpacking/Inspection ..................33 Product Overview ..................33 Front Panel Description .................34 Rear Panel Description ..................35...
  • Page 6 Contents (continued) 2.3.13 Load Correction .................60 2.3.14 Primary Load Correction ..............61 2.3.15 Secondary Load Correction ...............61 Program/Sequence (Test S1-S9) ..............62 Utility Functions ....................64 2.5.1 Perform Calibration ................65 2.5.2 Keypad Lockout .................69 2.5.3 Display Type ..................72 2.5.4 Numeric Format .................73 2.5.5 Trigger Source ...................74 2.5.6 Source Impedance ................74 2.5.7 RS-232 Baud Rate................75 2.5.8 IEEE488 Address ................75...
  • Page 7 Contents (continued) Theory - Section 4 Introduction ....................99 4.1.1 Description of 1910 Inductance Analyzer .........99 4.1.2 Block Diagram ...................101 Principle Functions ..................103 4.2.1 Fundamental Measurement ..............103 4.2.2 Sine Wave and Sampling Pulse Generator ........104 4.2.3 Digitization ..................104 Maintenance - Section 5 General ......................107...
  • Page 8 Page 4 of 110...

  • Page 9: Warranty

    IET Labs.'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 IET Labs., replaced at no charge when returned to a IET Labs. service facility.
  • Page 10 Page 6 of 110...

  • Page 11: Specifications

    Specifications Measure Parameters: Parameter Range Basic Accuracy Medium High 0.5% 0.25% 0.1% Ls, Lp 0.001nH to 99.999H 0.5% 0.25% 0.1% Cs, Cp 0.01pF to 9.9999F 0.005 0.0025 0.001 .00001 to 99.999 0.005 0.0025 0.001 .00000 to 9999.9 0.005 0.0025 0.001 Y, Gp, Bp 10nS to 9999.9S 0.5%...
  • Page 12 Specifications (Continued) Bias Current: Internal: 1mA to 1A in 1mA steps External: 0 to 20A in 5mA steps (using IET Labs. 1320) Display: LCD display with backlight Results Format: Engineering Numeric Deviation from Nominal of Primary Parameter % Deviation from Nominal of Primary Parameter...

  • Page 13: Accessories

    Accessories Accessories Included Item Quantity IET Labs. P/N AC Power Cord 4200-0300 Power Line Fuse (installed in instrument) 520049 Instruction Manual 150491 Calibration Certificate Accessories/Options Available Item Quantity IET Labs. P/N Axial/Radial Component Test Fixture 1689-9600 4 BNC Connectors to 2 Kelvin Clip Lead Set...
  • Page 14 Accessories (Continued) Figure A-2: 1689-9600 Axial/Radial Remote Test Fixture 1700-03 High Chassis Figure A-3: 1700-03 BNC (4) Connectors to 2 Kelvin Clip Lead Set 1700-04 Figure A-4: 1700-04 BNC (4) Connectors to Banana Plugs (4) Page 10 of 110...
  • Page 15 Accessories (Continued) Figure A-6: 1689-9602 BNC (4) to BNC (4) Cable Set, 1 meter 1689-9602-2 BNC (4) to BNC (4) Cable Set, 2 meters Figure A-7: 7000-07 Low Voltage Chip Component Test Fixture Page 11 of 110...
  • Page 16 The 2000-16 Rack Mount Flanges (quantity 2, left and right) are used as dress panels to adapt the 1910 to the standard 482.6 mm (19 inch) rack width. THESE FLANGES SHOULD NOT BE USED AS SOLE MOUNTING SUPPORT OF THE 1910 in rack mount applications.

  • Page 17: Safety Precautions

    Safety Precautions The 1910 Inductance Analyzer can provide an output voltage to 1.0V AC and current to 1A DC to the device under test (DUT). Although the 1910 unit is designed with full attention to operator safety, serious hazards could occur if the instrument is used improperly and these safety instructions are not followed.
  • Page 18 Safety Symbols The product is marked with the following safety symbols. Product will be marked with this symbol (ISO#3864) when it is necessary for the user to refer to the instruction manual in order to prevent injury or equipment damage. Product marked with this symbol (IEC417) indicates presence of direct current.

  • Page 19: Condensed Operating Instructions

    Start-Up The 1910 Inductance Analyzer can be operated from a power source between 90 and 250 VAC at a power line frequency of 50 to 60 Hz. The unit is shipped with a 2.5A fuse in place for 90 to 250 V operation.

  • Page 20: Selecting Test Conditions

    Programming Test Conditions Programming Test Conditions Press the UP or DOWN arrow to select test # (location where test conditions are stored). Test # (1 - 30) 1.000kHz Sequence Test # (S1 - S10) 1.000V No Bias Auto High Refer to paragraph 2.4 Press PROGRAM to enter programming mode Press [PROGRAM] at any 1 Prim Param...
  • Page 21 Programming - continued: Amplitude Press the RIGHT arrow to select amplitude of voltage Right Amplitude Program 20.00 mV Press the UP or DOWN arrow to change amplitude value 20.00mV - 1.0000V Amplitude Program 1.0000 V in 5mV steps Bias Current Press the RIGHT arrow to select bias current Not shown if Primary...
  • Page 22 Programming - continued: Delay Press the RIGHT arrow to select delay time Right Delay Program 0.00 ms Press the UP or DOWN arrow to change delay time value Off, or 100msec to 100.00sec Delay Program 100.00 sec in 10msec steps Averaging Press the RIGHT arrow to select number to average...
  • Page 23 Programming – continued: Binning (Primary Parameter) Press the RIGHT arrow to select type Not shown if Primary Right Bin Type Program Parameter is set to Automatic Press the UP or DOWN arrow to change type Absolute, Percent Deviation Bin Type Program Absolute or Off Press the RIGHT arrow to select...
  • Page 24 Programming – continued: Secondary Nominal Press the RIGHT arrow to select secondary nominal value Not shown if Primary Right Sec Nominal Program Parameter is set to Automatic Press the UP or DOWN arrow to change secondary nominal value Off, or range of values and Sec Nominal Program units that depend on...
  • Page 25 Programming – continued: Load Correction Press the RIGHT arrow to select load correction Not shown if Primary LoadCorrect (START = GET) Right parameter is set to Automatic Press the UP or DOWN arrow to change load correction value LoadCorrect (START = GET) Off, On Measure Press [START] to measure Load Correction based on primary and secondary nominals...

  • Page 26: Zeroing

    Programming Tester Utility Functions Tester functions are accessed through the UTILITY mode. Cal with 1M Cable Press [UTILITY] at any time to [UTILITY] Cal Due: 1/10/2001 exit programming mode. Perform Calibration/Zeroing Press the RIGHT arrow to skip Open/Short and go to Keypad Lockout with indicated cable length Indicates due date of next Cal with 1M Cable Right...
  • Page 27 Tester Utility Functions – continued Remove Open. Connect SHORT standard. Press START to continue. Connect Test Leads in SHORT configuration to 1930 SHORT Kelvin Leads Clipped Together Press the [START] to initiate short calibration measurement [START] Short Correction factor C: 1 9: F1 I5 Short correction Calibration Complete Press START to continue...
  • Page 28 Tester Utility Functions – continued: Display Type After last lockout digit, Press the RIGHT arrow to select display type Display Type Util Right Measured Parameters Press the UP or DOWN arrow to change display type Measured Parameters, Dev Display Type Util from Nominal, % Dev from Dev.
  • Page 29 Tester Utility Functions - continued Source Impedance Press the RIGHT arrow to select source impedance Source impedance Util Right 5 Press the UP or DOWN arrow to change source impedance 5  , 25  , 50  or 100  Source Impedance Util 100...
  • Page 30 Tester Utility Functions - continued Clear All Tests Press the RIGHT arrow to select clear all tests Clear All Tests Util Right Press the UP or DOWN arrow to change clear all tests No or Yes Clear All Tests Util NOTE: If YES is selected, press Right arrow, Up arrow and Right arrow again to clear all tests.
  • Page 31 Tester Utility Functions – continued Frequency Edit Type Press the RIGHT arrow to select frequency edit type Freq. Edit Type Util Right Discrete Press the UP or DOWN arrow to change frequency edit type Continuous or Discrete Freq. Edit Type Util Continuous Refer to paragraph 2.5.12...

  • Page 32: Connection To Device Under Test

    Connection to Device Under Test (DUT) Figure COI-1 illustrates the 1910 Inductance Analyzer connected to a device under test using the 4-BNC to 2-Kelvin Clip lead set (QT P/N 1700-03). 1910 Inductance Analyzer IET Labs Bias On Model 1910 V1.4...
  • Page 33 Make sure the device under test (DUT) is connected to the instrument as previously described. To initiate a test on the device press the [START] key. The LCD display shows the measured results depending on the operator programming of Display Type and Numeric Format. Typical display is shown below. 158.460 uH Measured Parameters Bin 1...

  • Page 35: Unpacking/Inspection

    The 1910 covers a frequency range from 20Hz to 1.0MHz with a basic accuracy of 0.1%. The user can select measurement and display two impedance or voltage parameters simultaneously and select engineering or numeric display of test results as well as deviation or % deviation from a programmed nominal value.

  • Page 36: Front Panel Description

    Front Panel Description Figure 1-1 shows the controls and indicators on the front panel of the 1910 Inductance Analyzer. Table 1-1 identifies them with descriptions and functions. 1910 Inductance Analyzer IET Labs Bias On Model 1910 V1.4 Remote FAIL PASS...

  • Page 37: Rear Panel Description

    Rear Panel Description Figure 1-2 shows the controls and connectors on the rear panel of the 1910 Inductance Analyzer. Table 1-2 identifies them with descriptions and functions. NO USER SERVICEABLE PARTS INSIDE TO PREVENT ELECTRICAL SHOCK DO NOT OPEN COVERS...

  • Page 38: Installation

    1.5.3 Power Requirements The 1910 can be operated from a power source between 100 and 240Vac at a power line frequency of 50 to 60Hz, no line voltage switching is necessary. Power connection to the rear panel is through an AC inlet module comprised of an AC connector and fuse drawer.
  • Page 39 Procedure for changing fuse WARNING MAKE SURE THE UNIT HAS BEEN DISCONNECTED FROM ITS AC POWER SOURCE FOR AT LEAST FIVE MINUTES BEFORE PROCEEDING. NO USER SERVICEABLE PARTS INSIDE TO PREVENT ELECTRICAL SHOCK DO NOT OPEN COVERS REFER TO QUALIFIED PERSON CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE ONLY...

  • Page 40: Safety Inspection

    Do not expose the instrument to direct sunlight, extreme temperature or humidity variations, or corrosive chemicals. When the 1910 is used in a rack installation (using the IET Labs. 2000-16 Rack Mount Flanges) make sure the unit is secured using rack cabinet mounting rails, and not secured solely by these front panel flanges.

  • Page 41: Terms And Conventions

    Section 2: Operation/Programming Terms and Conventions Table 2-1: Measurement Unit Prefixes Multiple Scientific Engineering Symbol 10 15 1000000000000000 Peta 10 12 1000000000000 Tera 10 9 1000000000 Giga 10 6 1000000 Mega 10 3 1000 Kilo 10 -3 .001 milli  10 -6 .000001 micro...
  • Page 42 Capacitance: The ratio of charge on either plate of a capacitor to the potential difference (voltage) across the plates. When a voltage is applied, current flows immediately at a high rate then exponentially decays toward zero as the charge builds up. If an AC voltage is applied, an AC current appears to flow continuously because the polarity of the voltage is reversed at the frequency of the applied voltage.

  • Page 43: Power Up

    DO NOT TURN INSTRUMENT POWER ON OR OFF WITH TEST DEVICES CONNECTED. Power is applied to the 1910 by pressing the front panel POWER switch to ON (1 position). The instrument sequences through a initialization routine, display of operating software version, and to the Ready mode of the test setup # in which a measurement was made before the unit was last powered down.

  • Page 44: Primary Parameter

    Any combination of two ac parameters, or two dc parameters, can be measured and displayed simultaneously on the 1910, one referred to as the Primary (displayed first) and the other the Secondary (see paragraph 2.3.2). The instrument can be set for a primary parameter selection of Auto, a feature which enables any passive component to be measured without knowing what type of component it is.
  • Page 45 The following selections are possible and discussed in more detail below. Ls - Inductance in henries P – Phase Angle in degrees Lp - Inductance in henries |ESR|-Equivalent series resistance in ohms Rs - Resistance in ohms Gp - Conductance in siemens Rp - Resistance in ohms Xs - Reactance in ohms Cs - Capacitance in farads...
  • Page 46 Impedance is the parameter used to characterize electronic components, materials and circuits. Impedance |Z| is defined as the opposition a device or circuit offers to the flow of ac current at a particular frequency and generally represented as a complex quantity consisting of a real part (resistance, R) and imaginary part (reactance, jX).

  • Page 47: Secondary Parameter

    Quality factor (Q) is used as a measure of a reactance's purity (how close it is to being a pure reactance, i.e. no resistance) and defined as the ratio of the energy stored in a device to the energy dissipated by the device. Q is dimensionless and is expressed as Q = X/R = B/G. From Figure 2-3 one can see that Q is the tangent of the angle .

  • Page 48: Frequency

    DUT impedance and source resistance of the 1910, which can be 5, 25 50 or 100. Refer to Utility functions, paragraph 2.5.6 for information on the source impedance. The instrument source resistance must be taken into consideration especially when measuring low values of impedance (low inductance or high capacitance).

  • Page 49: Bias Current

    When using the 1910 (in external bias mode) with the IET Labs. 1320 DC Bias Current Source, the Bias Current must be set to OFF and the 1320 set to Handler mode. Refer to the 1320 instruction manual. Connect the 1910 input BNC’s (4) to the 1320 FROM L METER BNC’s (4), using BNC to BNC cable.

  • Page 50: Range Select

    Right arrow key to program next parameter PROGRAM key to exit Program Mode and return to Ready mode. 2.3.6 Range Select This function allows the user to manually select a measurement range. There are 27 current/voltage range combinations (45 for DC), but the test frequency will determine which ranges are selectable.
  • Page 51 7 ranges as listed above (200mA range not recommended) 7 ranges as listed above (200mA and 40mA range not recommended) 1910 Source Resistance PROGRAM MEASURE MEASURE NOTE: The best way to determine the optimum range for a test device at programmed conditions is to change the primary parameter selection to V (AC voltage across the device), secondary parameter to I (current through the device), and initiate a test.

  • Page 52: Accuracy

    Remote I/O interface. The instrument will make a more precise measurement when programmed for High, but there is a tradeoff in measurement speed as indicated in Table 2-3. Table 2-3: 1910 Accuracy Accuracy Setting Measure Time...
  • Page 53 The 1910 has three basic accuracies: Basic Accuracy For AC: High 0.10% Medium 0.25% Low & Low No Display 0.5% The actual accuracy at a given test condition is defined by the following formula:      ...
  • Page 54 Additional Impedance Error (  Z  ) with Current Bias:  Z  = Accuracy * (1 + E = UNKNOWN impedance factor error = Instrument frequency factor error If Q  10, multiply  Z  by (1 + 1/Q) Unknown Impedance Factor (E UNKNOWN Impedance ( ...

  • Page 55: Delay

    Calculate Impedance (  ZL  ) to obtain Inductance error (LE)  ZL  = 2   10k  1mH = 62.8 Check Tables: E = 0, E LE =  Z  = Accuracy (1 + E LE = ...

  • Page 56: No. To Average

    2.3.9 No. to Average This function allows the user to program the number of measurements to average between 1 and 999. If the entered value is 1, averaging is disabled and the display is updated with each individual measurement. If the entered average is 10 the instrument will make 10 measurements and then display the average value.

  • Page 57: Primary Nominal

    2.5.3. 3) The nominal value (or actual known value) when implementing the load correction feature of the 1910. Refer to paragraph 2.3.13. This function allows the user to select a nominal value for the primary displayed parameter, selection of nominal value for the secondary parameter is discussed in paragraph 2.3.12. One technique for determining the approximate nominal values (or starting point) is to first measure the DUT and then fine tune as indicated below.

  • Page 58: Bin Type

    A group of similar components can be measured and categorized according to operator programmed limits. For example, the 1910 can be used to sort a group of nominally-valued 100 k resistors into assigned bins of 1%, 2%, 5%, etc., around a nominal value, or sorted by absolute limits which are independent of any nominal value.
  • Page 59 Fail Fail Bin 3 Bin 2 Bin 1 Bin 3 75.00 k 85.00 k 95.00 k 105.00 k 125.00 k 1 Bin Type Program Up or Down arrow key to change bin type 1 Bin Type Program Pct. Deviation Right arrow key to 1 Bin 1 HiLim Program...
  • Page 60 Right arrow key to 1 Bin 2 HiLim Program select bins 2 thru 10 Hi and Lo limits Up or Down arrow Bin 2 thru 10, Hi & Lo limits to change them PROGRAM key, at 1 Bin 10 LoLim Program any time, to return to Ready mode...

  • Page 61: Secondary Nominal

    2.3.12 Secondary Nominal (not shown if Secondary Parameter is set to “No Secondary parameter”) This function allows the user to select a nominal value for the secondary displayed parameter and to program high and low limits around this nominal. These limits are selected in absolute value or % deviation about this nominal (determined by bin type selection, refer to paragraph 2.3.11).

  • Page 62: Load Correction

    Measurement accuracy is 0.25 x (normal accuracy) with Load Correction implemented and compared to user supplied standard and for the same measurement conditions (test voltage, test frequency, and 1910 measurement range). This increased accuracy applies in a range of: DUT's with impedance (Z) between 3 and 800k, with programmed voltage from 100mV to 1V Load correction can be set to Off or On.

  • Page 63: Primary Load Correction

    2.3.14 Primary Load Correction The value shown is the measured load correction for the primary parameter, which can be further altered by the operator as shown below. Primary Load Correction = Load Correction Measured minus the Primary Nominal value) For example, if the load correction measured is 148.000 nH (para 2.3.13) and the primary nominal is 140.000 nH, the primary load correction shown here would be –8.0000 nH.

  • Page 64: Program/Sequence (Test S1-S9)

    Program/Sequence (Test S1-S9) Sequence tests (S1 through S9) are selected by pressing Up or Down arrow key when instrument status is in the Ready or power up mode. 1.0000 KHz 1.000V NoBias Auto High Sequence Test # Instrument Ready status 1 3 5 7 9 10 User tests # to be performed in...
  • Page 65 Sequence 1, Test 4 Right arrow key to select S1 : 4 Program test # 4 in the sequence Test : 8 S1 : 4 Program Up or Down arrow key Tests 1 – 30, skip or Test : 9 to change test # for test 4 none Sequence 1, Test 5...

  • Page 66: Utility Functions

    Utility Functions The Utility functions allow the user to set instrument functions that affect all tests. When the UTILITY key is pressed the first function, Cal, and other functions (as list in Table 2-4) are accessed by pressing the Right arrow key.

  • Page 67: Perform Calibration

    Open/short data is deleted by going in and out of PROGRAM mode or programming any parameter of the current single test via remote. The operator is prompted by the 1910 display when performing the cal procedures. Parameter Selections:...
  • Page 68 Press STOP at anytime to exit Cal routine Leads open and positioned Fixture open, nothing with spacing typical for inserted DUT being measured IET Labs. 1701-01 Test HIGH Black Figure 2-4 Open Circuit Configuration (Kelvin Clip Lead Set or Test Fixture)
  • Page 69 Program the 1910 for OPEN as follows: C: 1 9: F1 Press START to initiate Open correction Indicates # of record in Indicates index of frequency table which controls cal (0 for DC, 1-14 for ac) C: 1 9: F1...
  • Page 70 Program the 1910 for SHORT as follows: C: 1 9: F1 Press START to initiate Short correction (DC Short Correction) Connect SHORT standard. Press START to continue. C: 1 9: F1 Press START to initiate Short correction (AC Short Correction) Calibration Complete.

  • Page 71: Keypad Lockout

    2.5.2 Keypad Lockout Selection of Off allows the operator to modify any stored test conditions and use all functions of the instrument, with no restrictions. When a password is entered for Lock Password only, the currently selected test conditions, along with the instrument START and STOP functions are active.
  • Page 72 Keypad Lockout Util Lock Cycle Tests Passwd Right arrow key to Keypad Lockout Util enter password 000000 Up or Down arrow Keypad Lockout Util key to change the first 800000 digit (0 thru 9) Right arrow key to Keypad Lockout Util move to next digit 800000...
  • Page 73 To unlock Password Press Utility key Keypad Lockout Util Keypad Lockout Util On With Test Number Up or Down arrow key Keypad Lockout Util to unlock password Enter Password to Unlock Right arrow key to Keypad Lockout Util enter password 000000 Up or Down arrow...

  • Page 74: Display Type

    2.5.3 Display Type Measured Parameters, Display is the measured values of both the primary and secondary, displayed with decimal point and units. Deviation from Nominal, Display is the difference in measured value above or below (-) a programmed nominal value for the primary and secondary parameters. Refer to paragraph 2.3.10, programming the primary nominal and paragraph 2.3.12, programming the secondary display.

  • Page 75: Numeric Format

    2.5.4 Numeric Format Allows selection from two different measurement results formats, Scientific or Engineering units. Scientific units are expressed as an exponent and engineering units are expressed in ohms for resistance, farads for capacitance, henries for inductance, etc. For example e 3 in scientific units can be expressed as k...

  • Page 76: Trigger Source

    Ready mode. 2.5.6 Source Impedance This function allows the operator to select the 1910’s output source impedance, selections available are 5, 25, 50, and 100. In general the measuring instrument’s source impedance will usually have a direct effect on the measured impedance of the device. This is especially important when measuring the Q of a device and comparing the results between two different testers;...

  • Page 77: Baud Rate

    2.5.7 RS-232 Baud Rate This function allows the operator to select the baud rate when communicating via the RS-232 interface, selections possible include 9600, 19200, 9600 AutoReport, 19200 AutoReport or Disabled. The Auto Report options are used to log test results and error messages on a receive- only serial device, such as a serial printer.

  • Page 78: Clear All Tests

    2.5.9 Clear All Tests This selection allows the operator to clear all stored test setups in instrument memory (1 thru 30 for single tests or S1 thru S10 for sequential tests). After this operation, all tests are programmed to defaults coded by instrument software, which is generally as follows: Primary: Range: Automatic...

  • Page 79: Cable Comp

    This function allows the operator to select the type connection made to the device under test, a direct connection to the front panel, No Cable, 1 M Cable or 2 M Cable. The 1910 is factory calibrated to compensate for the various lengths of test cables, choosing the correct cable length is important to assure accurate measurements.

  • Page 80: Median

    2.5.13 Median This function allows the operator to choose single or median measurement mode. When median of 3 is selected three individual measurements are made, the lowest and highest values are discarded and the median value displayed. Median mode can improve instrument accuracy by: specified accuracy/divided by 3 ;...

  • Page 81: Serial Number

    2.5.15 Serial Number This function allows the operator to view the instrument serial number. This serial number can also be returned when the unit is under remote control but there is no command for changing this number. Serial Number 0104985 ULITITY key to exit and return to Ready mode.
  • Page 82 Operator Help messages (continued) Test is disabled program sequence test DSP reported invalid params; check setup Frequency and locked range incompatible Locked range invalid for AC; set to HOLD Primary nominal invalid Set to default Secondary nominal invalid; set to default Load correction invalid, for AUTO meas: disabled Bin limits reset to defaults Test restored from defaults correctly...

  • Page 83: General

    Section 3: Interface General The 1910 Inductance Analyzer includes three interfaces standard with the unit, the Remote I/O , RS-232 and IEEE-488. Connection for these are located on the instrument’s rear panel and discussed in detail below. Remote I/O The 1910 comes standard with an automatic component remote I/O interface port available through a 37 pin DB type connector located on the rear panel of the instrument.
  • Page 84 Table 3-1 Remote I/O Interface Connections Signal Name Pin Number Function Outputs: Busy Measurement in process Bin 1 Primary Pass Secondary Pass if binning is enabled and all Primary bin limits are set to Off All steps in a Sequence test are Pass Bin 2 Primary Pass or...

  • Page 85: Interface

    RS-232 Interface An RS232 serial port interface is available on the 1910 through a 9 pin DIN connector on the rear panel of the instrument. The RS232 standard defines electrical specifications for the transmission of bit serial information. The use of the RS232 port requires three lines, receive data, transmit data, and signal ground.

  • Page 86: Ieee-488.2 Interface

    IEEE-488.2 Interface 3.4.1 General An IEEE-488 interface is available standard on the 1910 through a connector (24 pin) on the rear panel. This interface can be used to connect to a system containing a number of instruments and a controller in which each meets IEEE Standard 488.2 (Standard Digital Interface for Programmable Instrumentation) Refer to Table 3-3 below for a full tabulation of connections and Table 3-4 for the command set.

  • Page 87: Ieee-488 Connections

    3.4.2 IEEE-488 Connections Figure 3-3 IEEE-488 Interface Pin Configuration Table 3-3 IEEE-488 Interface Connections Signal Name Pin Number Function ___________________ Low state: "Data is Available" and valid on DI01 through DI08 NRFD 7 Low state: At least one listener on the bus is "Not ready for Data".

  • Page 88: Ieee-488 & Rs-232 Commands

    CONFigure or SYSTem commands that follow should only be used with the commands for which they were intended. The 1910 commands are interpreted as numeric values but for convenience in programming they are not entered as numeric but rather as a more understandable command. For example; when programming the primary parameter for Lp it would appear as “CONF: PPAR LP”, which is also equivalent to “CONF: PPAR 2”.
  • Page 89 Table 3-4 (Continued) IEEE & RS-232 Commands Command Function Parameter(s) CONFigure: PPARameter Set primary parameter AUTO LS LP RS RP CS CP DF Q Z Y P ESR GP XS BP V I DCV DCR DCI SPARameter Set secondary parameter NONE LS LP RS RP CS CP DF Q Z Y P ESR GP XS BP V I...
  • Page 90 Table 3-4 (Continued) IEEE & RS-232 Commands Command Function Parameter(s) SEQuence: TEST Set current step to test number nn NONE SKIP SYSTEM: LOCKout Lockout keypad from the remote OFF ON DISPlay Set display type DMEAS DDEV DPCT FRESult Format result type SCI ENG TRIGger Trigger type...
  • Page 91 Table 3-4 (Continued) IEEE & RS-232 Commands Command Function Parameter(s) MEASure Triggers a measurement of the selected type. If sequence is enabled this command will trigger those type of measurements also. The result type is set by the display type parameter Triggers a measurement of the selected type, and automatically returns the answer after the measurement is complete.
  • Page 92 Table 3-4(Continued) IEEE & RS-232 Commands Command Function Parameter(s) If the secondary parameter is set to NONE, the format will be: n.nnnnEmmm<space>*<space> If the secondary parameters is set to anything other than NONE, the format will be: n.nnnnEmmm<space> n.nnnnEmmm <space> If the measurement is invalid for some reason (typically an A/D overrange, because normally the range will be locked to shorten the cycle time), the return format will be:...
  • Page 93 Bin limits are always returned as absolute deviation even if bin type is % deviation. This is a convenient way to see what the actual limits will be when setting up a test *IDN? Returns instrument identification "IET Labs Inc., 1910,xx...xx, software version”. x denotes serial number up to 8 digits *ESR? Returns the read of the event status register.

  • Page 94: Remote Calibration

    The unit must be in LOCAL LOCKOUT state (the light below the remote light will be lit). If the host terminal is RS-232, prompts are sent by the 1910 with no action by the host. The URQ bit in the ESR is used to signal to an IEEE-488 host that a prompt is available. This bit may be monitored by polling ESR, or the SRQ mechanism may be used to retrieve prompts.
  • Page 95 and the 1s digit is the 1-based index of the record to edit, allowed values 1 thru 4 (not used when option is 0 but still must be a number 1-4). All 4 records can be edited for each resistor even if the "count" for that resistor is set to 2 or 3. Examples: ROI Value STANDARD 101...
  • Page 96 Perform the action requested by the first part of the string and then send CAL MEAS. If the second part of the prompt is of the form ": Min n.nnn Max m.mmm” make the requested measurement and enter the value (which will be a voltage measurement); if the measurement is not in the specified range, something is wrong.
  • Page 97 The prompts for a full calibration are as follows: Connect VCal box, SW=OFF; send CAL MEAS to continue. Enter RMS volts:: Min 0.200000 Max 2.000000 Enter RMS volts:: Min 0.020000 Max 0.200000 Set VCal box switch ON.; send CAL MEAS to continue. Enter RMS Volts:: Min 0.200000 Max 0.800000 Set VCal box switch OFF.;...

  • Page 98: Formats

    *The Status Byte Register is readable via the standard *STB? as defined in paragraph. 11.2.2.2 of the IEEE spec. The 1910 will also implement an SRE register to enable each bit of the Status Byte Register per paragraph 11.3.2 of the IEEE spec. This register shall be readable by a SRE? command and writeable by a SRE <#>...
  • Page 99 Standard Event Status Register Decimal Value Power Up Since Last Query None Command Error (Syntax) Execution Error (Over Range, etc.) None Query Error None Operation Complete This register is read by executing an “*ESR?” command per paragraph 11.5.1.2.2 (except no *). Note that this is a destructive read.

  • Page 101: Introduction

    Section 4: Theory Introduction The model 1910 Inductance Analyzer uses a principle of measurement which is based upon a technique developed by IET Labs. for its 7000 Series of Precision LCR Meters. In particular, the model 1910 employs digital techniques for signal generation and detection, as well as for the more usual data processing, user input output and remote communications functions.
  • Page 102 For the detection circuitry this includes the reference resistor, the gain in the current and voltage detectors, and analog filtering optimized for the frequency of excitation. There are five reference resistors, each of which covers an impedance range of 15:1, and 5:1 at the lowest impedance. The reference resistor is normally chosen by the embedded computer to match the impedance of the unknown as closely as possible.

  • Page 103: Block Diagram

    4.1.2 Block Diagram The block diagram, Figure 4-1, shows the embedded computer connected via a CPU bus (B) composed of address, control and data lines to the other major functional blocks of the circuit. The embedded computer includes the following types of memory: RAM for Program execution, FLASH for non-volatile program storage, EEROM for storage of calibration data, instrument configuration, and test setups.
  • Page 104 Bias Control Current Detector Analog to Power Digital Buffer CPU Bus (B) Converter Sine Wave and Sample Digital Sinal Pulse Processor Generator Embedded Computer Display and Remote Keyboard Interfaces Figure 4-1: 1910 Instrument Block Diagram Page 100 of 110 Theory...

  • Page 105: Principle Functions

    Principal Functions 4.2.1 Fundamental Measurement The fundamental measurement technique is illustrated as a simplified diagram in Figure 4-2. sine wave generator drives current IH through the DUT and a standard resistor in series. Two differential amplifiers with controlled gains produce voltages Ex and Es. Simple algebra results in an expression for the complex impedance.

  • Page 106: Sine Wave And Sampling Pulse Generator

    The two samples are taken very nearly at the same time. Any delay of one channel relative to the other is calibrated out digitally during the calibration process. Figures 4-3, 4-4 and 4-5 further illustrate the signal flow and test points within the 1910 Inductance Analyzer.
  • Page 107 Voltage Current Figure 4-4: Detector Circuits Theory Page 103 of 110...
  • Page 108 Figure 4-5: Digital Signal Processor Page 104 of 110 Theory...

  • Page 109: General

    Service Lab and will serve as a reference number for the time your unit is at IET Labs.. Please contact our Customer Care Center (CCC) at 800-253- 1230 for additional support. The CCC phone line is staffed from 8:00am to 5:00pm (EST).
  • Page 110 Data Sheet. If the calibrated values for the standards used do not have an uncertainty of 4 times better than the specified accuracy of the 1910 the uncertainty of the standard should be added to the specified accuracy of the 1910. For example: if the calibrated value of the 500m standard is 495.0m...
  • Page 111 See paragraph 2.5.1 for information on performing an open and short correction. Connect each standard listed in the Verification Data Sheet and select the test frequency on the 1910 as listed, see paragraph 2.3.3. Record the results in the Verification Data Sheet. Service & Calibration...

  • Page 112: 1910 Verification Data Sheet

    5.3.2 1910 Verification Data Sheet R500M Freq Pri. Actual Sec. Actual Voltage Primary Meas. Sec. Meas. Q Pspec Sspec 1000 0.327% 0.0033 10000 0.327% 0.0033 100000 0.460% 0.0047 Freq Pri. Actual Sec. Actual Voltage Primary Meas. Sec. Meas. Q Pspec...
  • Page 113 L1000uH Freq Pri. Actual Sec. Actual Voltage Primary Meas. Sec. Meas. Q Pspec Sspec 1000 0.477% 0.2389 10000 0.161% 5.0163 100000 0.177% 55.2771 C50pF Freq Pri. Actual Sec. Actual Voltage Primary Meas. Sec. Meas. Df Pspec Sspec 1000 0.959% 0.0109 100000 0.352% 0.0084...

  • Page 114: Diagnostics

    C10nF Freq Pri. Actual Sec. Actual Voltage Primary Meas. Sec. Meas. Df Pspec Sspec 1000 0.120% 0.0014 100000 0.162% 0.0038 1000000 0.654% 0.0354 C20nF Freq Pri. Actual Sec. Actual Voltage Primary Meas. Sec. Meas. Df Pspec Sspec 1000 0.118% 0.0013 100000 0.162% 0.0038...

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