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QuadTech 7600 B Instruction Manual

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7600 Precision LCR Meter
Model B
Instruction Manual
Form 150261/A4
QuadTech, Inc., 1997
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.
!
Product will be marked with this symbol (ISO#3684) 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.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com

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Summary of Contents for QuadTech 7600 B

  • Page 1 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.

  • Page 2: Table Of Contents

    Contents Warranty ......................vii Specifications ......................ix Introduction - Section 1 Unpacking and Inspection ................1-1 Product Overview ..................1-1 Controls and Indicators.................. 1-2 Accessories Included ..................1-5 Accessories/Options Available..............1-5 Installation ..................... 1-6 1.6.1 Instrument Positioning............... 1-6 1.6.2 Power Requirements................1-6 1.6.3 Safety Inspection ................
  • Page 3 Contents (continued) 2.6.3 I/O Menu.................... 2-22 2.6.3.1 Display Type ................ 2-23 2.6.3.2 Nominal Value..............2-26 2.6.3.3 Result Format ............... 2-26 2.6.3.4 Trigger .................. 2-27 2.6.3.5 Handler Interface ..............2-27 2.6.3.6 RS-232 Interface..............2-27 2.6.3.7 IEEE-488.2 Interface............2-28 2.6.3.8 Print Results................2-28 2.6.3.9 Results to Floppy..............
  • Page 4 Contents (continued) Operation with Accessories ................2-79 2.8.1 General....................2-79 2.8.2 Rack Mount Kit (7000-00) ..............2-79 2.8.3 BNC Cable Set, 1 Meter (7000-01), 2 Meter (7000-02) ....2-79 2.8.4 Kelvin Clip Leads (7000-03)............. 2-80 2.8.5 Alligator Clip Leads (7000-04) ............2-82 2.8.6 Chip Component Tweezers (7000-05) ..........

  • Page 6: Warranty

    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.

  • Page 7: Specifications

    Specifications Measurement Capacitance (Cs/Cp), Inductance (Ls/Lp), Resistance (Rs/Rp), Parameters: Dissipation (DF) and Quality (Q) Factors, Impedance (|Z|), Admittance |Y|, Phase Angle (θ), Equivalent Series Resistance (|ESR|), Conductance (Gp), Reactance (Xs), Susceptance (Bp) Any two parameters measured and displayed simultaneously Note: s = series, p = parallel, ESR equivalent to Rs Measurement |Z|, R, X: 000.0001 mohm to 99.99999 Mohm...
  • Page 8 Specifications (continued) Source Impedance: 25Ω, 400Ω, 6.4 kΩ or 100 kΩ, measurement range dependent Trigger: Internal (automatic) and External (via handler, RS-232 or IEEE- 488.2 interfaces) 20 mV to 5.0 V (open circuit) in 5 mV steps, ≤500kHz AC Test Signal 20 mV to 1.0 V (open circuit) in 5 mV steps, >500kHz to≤1MHz Voltage: 20 mV to 0.5 V (open circuit) in 5 mV steps, >1MHz...
  • Page 9 Specifications (continued) Mechanical: Bench mount with tilt bail Dimensions: (w x h x d): 16 x 6 x 14in (410 x 150 x 360mm) Weight: 17 lbs (8kg) net, 23 lbs (10.5kg) shipping Power Requirements: 90 to 250Vac 47 - 63 Hz 40W maximum Charged Capacitor Protection: 8 / C for Vmax ≤...

  • Page 10: Unpacking And Inspection

    Inspect the shipping carton before opening, if damaged contact the carriers agent immediately. Inspect the instrument for any damage. If the instrument appears damaged or fails to meet specifications notify QuadTech (refer to instruction manual front cover) or its local representative. Retain the shipping carton and packing material for future use such as returning for re calibration or service.

  • Page 11: Controls And Indicators

    Controls and Indicators Figure 1-2 shows the controls and indicators on the front panel of the 7600. Table 1-1 identifies them with descriptions and functions. QuadTech DISPLAY SELECT ENTRY TEST Precision FAIL PASS 7600 MENU LCR Meter 17.52520 pF CAUTION...
  • Page 12 Table 1-1 (continued) Front Panel Controls and Indicators Figure 1-2 Ref. No. Item Function Select keys (4) Soft key functions as indicated on the adjacent LCD display. - from top to bottom, functions such as up, down, right or left arrow during menu selection.
  • Page 13 BIA S VOLT AG E IEE E-488 INT ERF ACE 200V MA X BAT TERY PARALL EL PORT RS-232 INTERF ACE I/O PORT 90 - 250 V 47 - 63 Hz 40 WA TTS M AX Figure 1-3 Rear Panel View Table 1-2 Rear Panel Connectors and Controls Figure 1-3...

  • Page 14: Accessories Included

    Table 1-2 (continued) Rear Panel Connectors and Controls Figure 1-3 Ref. No. Item Function Bias Voltage External bias input, maximum of +/-200Vdc. Contains F0.25A, 250V, 5x20mm fast blow fuse. Replace only with the same type and rating. Also refer to paragraph 2.6.2.5.

  • Page 15: Installation

    AC power the fuse should be in accordance with the power source, T2.5A, 250V, 5x20mm (QuadTech PN 520049) for 115 or 220V source. Always use an outlet that has a properly connected protection ground. The 7600 is factory shipped with the 2.5A fuse in place.

  • Page 16: Safety Inspection

    7600 to ensure that the properly rated fuse is in place, otherwise damage to unit is possible. Refer to paragraph 1.6.2. The 7600 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) and CE units with an approved international cord set.
  • Page 17 When the 7600 is used in a rack installation (using the QuadTech 7000-00 Rack Mount Kit) make sure the unit is secured using the cabinet mounting rails and not secured solely by the front panel angle brackets. In bench or rack mount applications the instrument should be positioned with consideration for ample airflow to the rear panel fan ventilation holes.

  • Page 18: General

    To help maintain measurement integrity QuadTech makes available a number of accessory cable sets and fixtures for connection directly to the front panel BNC connectors.

  • Page 19: Zeroing

    Measurement accuracy is specified at the end of the QuadTech one meter cable (7000-01). Open and short circuit zeroing should be done at the end of this cable. In order to maintain instrument accuracy with other cable lengths the instrument should be re calibrated using the QuadTech 7000- 09 Calibration Kit and the alternate cable.

  • Page 20: Measurement Procedure

    Follow the instructions shown on the LCD display for open and short circuit zeroing of test leads and/or fixture. During the Open Test the leads or fixture should be open with no component connected. During the Short Test leads should be connected or fixture shorted (using a clean copper wire, as short as possible).
  • Page 21 Factory default measurement conditions are: Under Setup Menu Primary Parameter - Auto Secondary Parameter - None Frequency - 1 kHz AC Test Signal - 1V DC Bias Voltage - Off Range Hold - Off Range Locked - 0 Measurement Accuracy - Medium Delay Time - 0 # to Average - 1 Contact Check - Off...

  • Page 22: Menu Functions

    Menu Functions 2.6.1 General All programmable functions of the Model 7600 are controlled by easy to use menu displays. The user enters the menu mode by selecting the MENU key which calls up four top level menus, Setup, I/O, Analysis and Utilities. Each one of these is comprised of a sub menu list whose functions are described in detail below.

  • Page 23: Primary Parameter

    Setup Analysis Utilities Primary Parameter Auto Secondary Parameter None Frequency - (numeric entry) |ESR| θ AC Test Signal - Voltage - Current - Value - (numeric entry) DC Bias Voltage - Off - Int θ - Ext |ESR| Range Hold - Off - On Range Locked - (numeric entry)
  • Page 24 Any combination of two parameters can be measured and displayed simultaneously on the 7600, one referred to as the Primary (displayed first) and the other the Secondary. The instrument as powered up provides a default primary parameter selection of Auto, a feature which enables any passive component to be measured without knowing what type of component it is.
  • Page 25 Rp or Rp or Figure 2-6 Series and Parallel Circuits for both Capacitive and Inductive Impedances 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 26: Secondary Parameter

    Capacitance Inductance ω j Cp φ δ δ φ ω -j/ Lp Admittance Figure 2-8 Phase Diagrams of Admittance 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.

  • Page 27: Frequency

    Additional Parameters not shown and selected by UP/DOWN arrow keys include: Lp, |Z|, |Y|, Xs, Bp As in the primary parameter selection, any one parameter can be chosen by the operator for display. The instrument as powered up provides a default secondary parameter. When the default primary parameter is Auto the secondary parameter is dependent and determined by it.

  • Page 28: Ac Test Signal

    2.6.2.4 AC Test Signal Setup Analysis Utilities AC Signal Signal Type Voltage Current Signal Value = 1.000 V HIT MENU TO RETURN TO MAIN MENU Figure 2-10 AC Test Signal Allows selection of the AC Signal Type as a Voltage source or Current source, RIGHT/LEFT arrow keys.

  • Page 29: Dc Bias Voltage

    Maximim Reccomended Test Frequency in Current Mode Inductance 1.0E+6 400 kHz Testing in current mode may give Q 100.0E+3 errors for inductors above this line Current Testing OK below this line 10.0E+3 35 kHz _________ sqrt(L(mH)) 1.0E+3 1.00E-06 1.00E-05 1.00E-04 1.00E-03 1.00E-02 1.00E-01...
  • Page 30 WARNING Make sure the AC test Signal is selected for VOLTAGE and not Current before switching to INT (internal) or EXT (external) bias. This also applies to the instrument's Default setup at power-up or any setups recalled from memory, they MUST be set to VOLTAGE before applying bias.

  • Page 31: Range Hold

    When applying a bias voltage there are effects to be aware of in watching for stabilization of the DUT: voltage and capacitance. Besides charging to a final voltage, there is also the stabilization of capacitance value itself. For example, some electrolytic capacitors respond slowly to a change in applied voltage, therefore the capacitance can be changing well after the voltage is stable.

  • Page 32: Range Locked

    2.6.2.7 Range Locked Accepts entry of selected measurement ranges between 0 and 59 (as listed below), 0 for no range locked and others for the selected range. Measurement ranges are a function of the impedance being measured (Z), selected test frequency (F) and ac test voltage (V). For best measurement results the instrument is generally recommended to operate with Range Hold to Off and Range Locked to 0.
  • Page 33 where R2 = 0 if (I)(Z) > 0.25 = 1 if (I)(Z) > 0.1 = 2 if (I)(Z) > 0.025 where R3 = 0 if I / K > 0.25 = 4 if I / K > 0.1 = 8 if I / K > 0.025 Note: above 1.5 MHz R2 and R3 are always 0 (zero) Operation 2-16...
  • Page 34 AC Signal Current Mode Measurement Range #'s Determine Range where R# = R + R1 + R2 + R3 = 33 and Rs = 400Ω if I ≤ 2.2mA where R = 49 and Rs = 25Ω if I > 2.2mA I = programmed ac test current ≤...
  • Page 35 Capacitive Reactance (Xc=1/(2pifC)) 1000000000 100000000 10000000 1000000 0.1pF 100000 1.0pF 10000 10pF 1000 100pF 1.0nF 10nF 100nF 10mF 1.0mF 100uF 10uF 1.0uF 0.01 1000 10000 100000 1000000 10000000 Fre quency Figure 2-11 Capacitive Reactance vs. Frequency Operation 2-18...
  • Page 36 Inductive Reactance (Xl=2pifL) 1000000000 100H 100000000 10000000 100mH 1000000 10mH 100000 10000 100uH 1000 10uH 100nH 10nH 0.01 1000 10000 100000 1000000 10000000 Frequency Figure 2-12 Inductive Reactance vs. Frequency Operation 2-19...

  • Page 37: Measurement Accuracy

    2.6.2.8 Measurement Accuracy Setup Analysis Utilities Accuracy Fast 25 meas/sec Voltage Medium .25% 8 meas / sec Slow .05% 1 meas / sec HIT MENU TO RETURN TO MAIN MENU Figure 2-13 Measurement Accuracy Allows selection of Measurement Accuracy of Fast, Medium or Slow. There is a tradeoff of measurement speed vs.

  • Page 38: To Average

    2.6.2.10 # to Average Accepts entry of the number of measurements to Average between 1 and 1000. If the entered value is 1, averaging is disabled and the display is updated with each individual measurement. If the average is 2 to 1000 the final average value is displayed at the end of the measurement cycle and held until the end of the next measurement cycle.

  • Page 39: I/O Menu

    2.6.3 I/O Menu Setup Analysis Utilities Display Type >> Nominal Value = 1.0000 Result Format Trigger Handler RS-232 >> IEEE >> Print Results Results to Floppy Figure 2-14 I/O Menu The second of the four main menus is I/O, shown above. Each function controls measurement results or instrument I/O interface and is described in detail below.
  • Page 40 2.6.3.1 Display Type Setup Analysis Utilities Display >> Measured Paramters Deviation from Nominal % Deviation from Nominal Pass / Fail Bin Summary Bin Number No Display HIT MENU TO RETURN TO MAIN MENU Figure 2-15 Display Type Allows selection from seven different modes of measurement display, these being: •...
  • Page 41 • Deviation from Nominal - Display is the difference in value above or below a stored nominal value for the primary parameter (also refer to paragraph 2.6.3.2). It should be noted that the nominal value is only shown in this display and the % Deviation display (Figure 2-18).
  • Page 42 • • • • Pass/Fail - Display is measured results as a pass or fail only based on entered binning limits. Pass / Fail Voltage Ω Ω Ω Ω Rs 2.894050 M Q 1.565000 PASS Freq 1.0000kHz AC Signal 1.000V Range Auto Average...

  • Page 43: Nominal Value

    • Bin Number - Display is a bin assignment, along with the currently programmed test conditions, for the most recent measurement result. Bin Number Voltage Freq 1.0000kHz AC Signal 1.000V Range Auto Average Delay 0 ms Bias Figure 2-21 Bin Number Display •...

  • Page 44: Trigger

    2.6.3.4 Trigger Allows selection of two trigger modes, Internal or External. • Internal - Measurement trigger is automatic and continuous once initiated with a START. If the STOP key is pressed in the middle of a measurement (with Range Hold set to OFF) any measurement range indication or displayed results is invalid. •...

  • Page 45: Ieee-488.2 Interface

    2.6.3.7 IEEE-488.2 Interface Setup Analysis Utilities IEEE >> Address Mode Talk Talk/Listen State Disable Enable HIT MENU TO RETURN TO MAIN MENU Figure 2-23 IEEE Setup Format Allows user setup of IEEE-488 interface format. Choices include: Address - 1 through 16 Mode - Talk or Talk/Listen State...

  • Page 46: Results To Floppy

    2.6.3.9 Results to Floppy Allows user to store measurement results on floppy disk (unless drive is not present). When selected, if a results file is not open, the user is prompted for the filename (up to 8 characters) and the file is opened. To close a results file that is currently open, select Results to Floppy and close.
  • Page 47 Sample file format as follows. Lines listed as not printed are not saved as results to floppy but only as Save Setup, refer to paragraph 2.6.5.1. Copyright QuadTech Inc. 1997 not printed ENDHEADER not printed 2000000.000000 ;frequency 5.000000 ;primary parameter 2.000000...
  • Page 48 0.000000 ;limit format bin 2 0.00000000000000000000 ;low limit bin 3 0.00000000000000000000 ;high limit bin 3 0.00000000000000000000 ;nominal value bin 3 0.000000 ;limit format bin 3 0.00000000000000000000 ;low limit bin 4 0.00000000000000000000 ;high limit bin 4 0.00000000000000000000 ;nominal value bin 4 0.000000 ;limit format bin 4 0.00000000000000000000...
  • Page 49 0.000000 ;secondary low 0.000000 ;secondary high 0.000000 ;sequence 0.000000 ;sequence status printed only if sequence enabled 1000.000000 ;sequence frequency 0.000000 ;sequence pri param 0.000000 ;sequence sec param 0.000000 ;sequence bias 0.000000 ;sequence ac signal type 1.000000 ;sequence ac signal value 0.000000 ;sequence delay 0.000000...
  • Page 50 0.000000 ;sequence bias 0.000000 ;sequence ac signal type 1.000000 ;sequence ac signal value 0.000000 ;sequence delay 0.000000 ;sequence range 0.000000 ;sequence range relay 0.000000 ;sequence relay 2 0.000000 ;sequence relay 3 0.000000 ;sequence var relay 1.000000 ;sequence stop on fail 0.000000 ;sequence status 1000.000000...
  • Page 51 1000.000000 ;correction frequency 49.000000 ;correction range 5.000000 ;correction primary parameter 4.000000 ;correction secondary parameter 25.17072 ohms ;correction measured primary -.1947500 ;correction measured secondary -0.170725 ;correction primary correction 50.194742 ;correction secondary correction 0.000000 ;enhanced distortion 0.000000 ;lockout 1.000000 ;backlite ENDHEADER 9.69573e-09 F 0.0052921 9.69645e-09 F 0.0052307...

  • Page 52: Analysis Menu

    2.6.4 Analysis Menu Setup Analysis Utilities Binning >> On Edit Test Sequencing Parameter Sweep Edit Median Distort Detect Load Correction Edit Figure 2-24 Analysis Menu The third of the four main menus is Analysis, shown above. Each function controls the analysis of measurement results and is described in detail below.

  • Page 53: Binning

    2.6.4.1 Binning Setup Analysis Utilities Binning >> Absolute Limit >> Tolerance % >> Secondary Low = 0.000000 Secondary High = 0.000000 View Bin Totals >> Zero Bin Totals >> HIT MENU TO RETURN TO MAIN MENU Figure 2-25 Binning The 7600 provides sorting capability into 15 bins (10 pass, 4 fail and 1 for no contact). For the binning function to be enabled, one or both of the two conditions must be met: 1.
  • Page 54 Bin 3 Bin 2 Measured Value Bin 1 Axis +10% Nominal Value 100.00 k Ω Tolerance Percent Nominal % BELOW % ABOVE 100.00 k 1.00 1.00 100.00 k 5.00 5.00 100.00 k 7.00 10.00 Sequential limits are a natural choice for sorting by absolute value. Sequential limits for three bins are illustrated below.
  • Page 55 • • • • Absolute Limit Absolute limit selection allows for entry of both upper and lower limit for each bin in absolute value. Valid range for each is -10 8 to 10 9 . If zero is entered for Low or High, the previous value is cleared and that bin disabled.
  • Page 56 Then arrow up or down to select units from those available (k is chosen in this example). Absolute Limit Low LIMIT High LIMIT 90.00 k 110.00 k 100.00 k 120.00 k 110.00 k 130.00 k 120.00 k 140.00 k 150.00 k 140.00 k 160.00 k 150.00 k...
  • Page 57 • • • • Secondary Low Accepts entry of numerical value for the low limit of the secondary parameter. Units are determined by the secondary parameter selection, i.e. in Farads, Ohms, Henries, etc. and selected by the UP/DOWN arrow keys. Valid range is -10 3 to 10 4 . NOTE: Low limit must be less than the High limit •...

  • Page 58: Test Sequencing

    2.6.4.2 Test Sequencing The 7600 is capable of performing a sequence measurement containing up to six different test steps. Different measurement parameters and conditions can be defined for each test in the sequence. Test sequencing can be selected as Off, On or Edit. Edit allows measurement parameters and test conditions to be changed for all six tests.
  • Page 59 Sequence Setup Test 1 Pri Param Auto HIT MENU TO RETURN TO MAIN MENU Figure 2-32 Sequence Setup (Parameter Selection) Bin assignment in the test sequence mode is defined as follows: Bin # Assigned Bin 1 Test 1 (Primary parameter, fail) Bin 2 Test 1 (Secondary parameter, fail) Bin 3...
  • Page 60 Sequence Setup Test 1 Low LIMIT High LIMIT 90.00 k 110.00 k 100.00 k 120.00 k Figure 2-33 Sequence Binning Test conditions of measurement sequences can be stored and/or recalled as part of test setups, refer to paragraphs 2.6.5.1 and 2.6.5.2 for storing or recalling setups. If a test sequence is stored as On, the sequence will be executed once the Start button is pressed, if the test sequence is stored as Off, the sequence will be inactive until turned on.

  • Page 61: Parameter Sweep

    2.6.4.3 Parameter Sweep The 7600 is capable of displaying a table or plot of measured results vs. a variable of frequency, voltage or current. Sweep can be selected as Off, On or Edit. Edit allows sweep test conditions to be changed.
  • Page 62 Plot Table Frequency 1.0000kHz 471.4576nF 0.003135 1.2915kHz 470.4563nF 0.003675 1.6681kHz 469.8878nF 0.003867 2.1544kHz 468.9983nF 0.010035 2.7825kHz 466.4532nF 0.010078 Prev 3.5938kHz 462.6634nF 0.011045 Page 4.6415kHz 460.6645nF 0.012895 5.9948kHz 459.7892nF 0.014786 7.7426kHz 458.7845nF 0.016782 Next 10.000kHz 456.5454nF 0.018544 Page Figure 2-36: Sweep Table The sweep table lists the measurement results for primary and secondary parameter (unless none is selected) along with the test condition variable of frequency, voltage or current.

  • Page 63: Median

    2.6.4.4 Median Allows for the selection of Median measurement mode to be On or Off. When selected each measurement will actually be three individual measurements, the lowest and highest values discarded and the median value displayed. Measurement accuracy can be improved as noted below and will be indicated on the AutoAcc display (but never less than 0.05% for primary parameter or 0.0005 for secondary parameter).
  • Page 64 This increased accuracy applies in a range of: DUT's with impedance (Z) between 3Ω and 800kΩ, with programmed voltage from 100mV to 1V, or from 100mV to (programmed current) x (Z) ≤1V. Load correction can be selected as Off, On or Edit. Edit allows the primary and secondary values to be entered, the parameter for these values is defined by the Primary and Secondary Parameter in the main Setup menu.

  • Page 65: Utilities Menu

    2.6.5 Utilities Menu Setup Analysis Utilities Save Setup >> Recall Setup >> AutoAcc >> Open / Short >> Lock Out >> Calibration >> Set Time / Date >> Usage / Cal Date >> Set Contrast >> Self Test >> LCD Backlite Save Figure 2-39 Utilities Menu...

  • Page 66: Save Setup

    2.6.5.1 Save Setup Setup Analysis Utilities Save DEFAULT FLOPPY 12345 1234 HIT MENU TO RETURN TO MAIN MENU Figure 2-40 Save Setup Allows a set of test conditions to be stored in instrument memory or on floppy disk for later recall. Test conditions are those that are user programmable in the Setup and I/O menus, as discussed in paragraphs 2.6.2 and 2.6.3.

  • Page 67: Recall Setup

    To make the current set of test conditions the default (at power up) one needs to select DEFAULT in the Save Setup menu and overwrite the conditions currently stored. To prevent overwriting the default setup by mistake an additional level of safety exists where the operator is required to respond with Yes or No, similar to Figure 2-41 above.

  • Page 68: Setup Accuracy

    When there are more setups than can fit on the display the page down key is active. If there is less than a whole page below, the display wraps around to the previous display. Continuing to page down will eventually return to the first display of setups. 2.6.5.3 Setup Accuracy Allows user to access the measurement calculation.
  • Page 69 For Fast Mode, R, L, C, X, G, B, |Z|, and |Y|           −           ±  −     ...
  • Page 70 D Accuracy Q Accuracy         * Q Q                5*10  θ θ θ θ Accuracy ESR Accuracy  ...

  • Page 71: Open / Short

    Measurement accuracy is specified at the end of the QuadTech one meter cable (7000-01). Open and short circuit zeroing should be done at the end of this cable. In order to maintain instrument accuracy with other cable lengths the instrument should be re calibrated using the QuadTech 7000-09 Calibration Kit and the alternate cable.

  • Page 72: Lock Out

    2.6.5.5 Lock Out LOCKOUT WITH SETUP RECALL SELECT THE LOCK OUT TYPE HIT <CNCL> TO EXIT LOCKOUT ONLY Figure 2-45 Lockout Allows user to turn keypad lock feature on or off. There are two choices that can be selected, lockout only and lockout with setup recall. In both modes only the START, STOP and MENU on the instrument front panel are active, all other keys disabled.

  • Page 73: Calibration

    Once activated, only the START, STOP and MENU on the instrument front panel are active, all other keys are disabled. To turn the lockout feature off and reactivate menus select MENU (select Exit Lockout in Lockout with Setup Recall mode) and enter the previous password from the keypad, the instrument will again function as normal.

  • Page 74: Usage/Cal Date

    2.6.5.8 Usage/Cal Date QuadTech 7600 Model B Version 4.0 THE TOTAL OPERATING TIME FOR THIS INSTRUMENT IS 1205.50 hours THIS INSTRUMENT WAS CALIBRATED ON 10/15/97 AT 11:25:10 HIT <MENU> KEY TO CONTINUE data Figure 2-47 Usage / Cal Date When selected, indicates the total elapsed time in hours that the unit has been powered up and the date of last calibration.

  • Page 75: Self Test

    2.6.5.10 Self Test When selected, runs a group of internal self tests to verify that calibration and open/short data are not corrupt. 2.6.5.11 LCD Backlite Allows the backlite on the LCD display to be Save or On. When set to Save the backlite turns off automatically if no keypad has been hit for 5 minutes and turns back on with the touch of START, MENU or ENTER keys.

  • Page 76: Input/Output Interface

    2.7 Input/Output Interface 2.7.1 I/O Interface The 7600 comes standard with an automatic component handler I/O interface port available through a 36 pin Centronics type connector located on the rear panel of the instrument. This port outputs signals to indicate measurement in process, measurement completed, and bin sorting judgments.
  • Page 77 Table 2-1: I/O Interface Connections (continued) Signal Name Pin Number Function -BUSY Measurement/comparison in progress TRIG+ Trigger high input TRIG- Trigger low input START+ Isolated Trigger high input START- Isolated Trigger low input source 11, 15, 33 System common IGND 5, 10, 23, 28 Isolated common 12, 32...
  • Page 78 a positive +5 to +24V external source (referenced to IGND) and pull-up resistor to operate as fully isolated signals. IGND can be isolated from system GND by removing jumper JP2 on the I/O PCB. With jumper JP2 in place optical isolation is defeated allowing the outputs to be pulled up to the system +5V with external resistors.
  • Page 79 • The BUSY line is held low to indicate that the 7600 is making a measurement. • The EOT line is held high (inactive) until the 7600 is done making a measurement and bin data is valid. End of Test •...

  • Page 80: Parallel Interface

    +,-./(+,-.0# +123 +,456 $%&'()*) 789: 53;<3=>(3<78= 793= $%&'()*) 53;<3+>(3<78+ 793+ !"## Figure 2-50 I/O Interface Isolation All handler I/O is conducted through a single 8255. The outputs from the 8255 are optically isolated for added interfacing flexibility and to increase reliability by reducing noise pickup and ground loop interference.

  • Page 81: Ieee-488.2 Interface

    Table 2-2 Parallel Interface Connections Signal Name Pin Number Function Outputs: -STROBE Indicates that data is ready to read Data bit 1 Data bit 2 Data bit 3 Data bit 4 Data bit 5 Data bit 6 Data bit 7 Data bit 8 -AUTOFD Auto paper feed...
  • Page 82 Source Handshake Parallel Poll Acceptor Handshake Device Clear Talker Device Trigger Listener Controller Service Request Electrical Interface Remote Local Table 2-3 IEEE-488 Interface Connections Signal Name Pin Number Function Low state: "Data is Available" and valid on DI01 through DI08 NRFD Low state: At least one listener on the bus is "Not ready for Data".
  • Page 83 Table 2-4 IEEE & RS-232 Commands Command Function Parameter(s) CONFigure: FREQuency Set the frequency from 10 to 2000000 Hz 0000000.00 PPARameter Set the primary parameter A(auto) CS CP LS LP RP RS DF Q Z Y P(phase angle) ESR GP XS BP SPARameter Set the secondary parameter N(none) CS CP LS...
  • Page 84 Table 2-4 IEEE & RS-232 Commands (continued) Command Function Parameter(s) CONFigure: BINNing: bin# ABS* Set the low & high limit for the bin low high (floating point #'s) Set the % below, % above and nominal % below % above value nominal (3 floating point #'s w/space...
  • Page 85 Table 2-4 IEEE & RS-232 Commands (continued) Command Function Parameter(s) CONFigure: SAVe: DUPLicate Save setup as duplicate filename in battery backed up RAM xxxxxxxx Save setup as new filename in battery backed up RAM xxxxxxxx RECall filename Recall setup filename from battery xxxxxxxx backed up RAM FVALid?
  • Page 86 Table 2-4 IEEE & RS-232 Commands (continued) Command Function Parameter(s) LOAd correction: NOMinals Set primary & secondary nominal values primary secondary (floating point #'s) MEAsure Perform the Correction Measurement and set Load Correction to On Set Load Correction to ON (valid only if a Correction Measurement has previously been made Set Load Correction to Off SYSTem:...
  • Page 87 Table 2-4 IEEE & RS-232 Commands (continued) Command Function Parameter(s) SHORt Perform short circuit calibration The procedure for performing a remote short is as follows: IEEE wait for SRQ OPC to indicate continue Send Any command if desired to implement Send Fetch? This will continue calibration Receive...
  • Page 88 Table 2-4 IEEE & RS-232 Commands (continued) Command Function Parameter(s) IEEE wait for SRQ OPC to indicate open circuit cal is done Send Any command if desired to implement Send Fetch? This will continue calibration Receive Connect the short circuit. Ensure that the standard is connected to the instrument Send CONTINUE...
  • Page 89 Table 2-4 IEEE & RS-232 Commands (continued) Command Function Parameter(s) FETCh? Fetches the most recent measurement results. The character sequence formats are as follows: Normal Measurements: <primary result name> <tab> <primary result> <tab> <units> <secondary result name> <secondary result> <tab> <units> <tab> <bin or tab> <tab> <#> <tab> <pass string or fail string or tab>...
  • Page 90 Parameter(s) LOADFEtch? Returns load correction status Valid, measured primary & secondary values Invalid IDN? Returns instrument identification "QuadTech,7600modelb,xx...xx,software version". ESR? x denotes serial number up to 10 digits Returns the read of the event status register. STB? Returns the read of the status byte register.

  • Page 91: Formats

    2.7.3.1 Formats IEEE 488.2 enable remote programming of all instrument functions, measurement conditions and comparator settings etc. Outputs include measurement conditions, open/short corrections, and measured values. Data Formats Data will be transmitted in ASCII NR3 format per IEEE488.2 sec. 8.7.4 and reproduced below.
  • Page 92 *The Status Byte Regester is readable via the standard STB? as defined in para. 11.2.2.2 of the IEEE spec. The 7600 will also implement an SRE register to enable each bit of the Status Byte Register per para 11.3.2 of the IEEE spec. This register shall be readable by a SRE? command and writeable by a SRE <#>...

  • Page 93: Sample Program For National Instruments Gpib Card

    2.7.3.2 Sample Program for National Instruments GPIB card 260 '*SAMPLE 7600 BASIC PROGRAM FOR NATIONAL INSTRUMENTS IEEE ** ' Merge National DECL.BAS here 270 ADAP$="GPIB0" : DEV4$="Dev4": R$ = SPACE$(60) 280 CALL IBFIND (DEV4$,DEV4%) 290 CLS '***** SET CONDITIONS, MEASURE, AND DISPLAY DATA ************ 300 SET$="CONF:REC DEFAULT"...

  • Page 94: Rs232 Interface

    2.7.4 RS232 Interface The 7600 comes standard with an RS232 serial port interface, available through a connector (9 pin) on the rear panel of the instrument, for connecting to a PC. The RS232 standard defines electrical specifications for the transmission of bit serial information. The use of the RS232 port requires five lines, receive data, transmit data, data terminal ready, data set ready and signal ground.

  • Page 95: Results To Printer

    7600 Controller Pin # Function Pin # Function Receive data Connect Transmit data Transmit data Receive data Data terminal ready Data set ready Signal ground Signal ground Data set ready Data terminal ready db9 to db9 Cable Configuration 7600 Controller Pin # Function Pin #...

  • Page 96: Operation With Accessories

    A wide selection of accessories such as test leads, cables and fixtures are available from QuadTech to enhance the operation of the 7600 Precision LCR Meter. A full list of accessories is given in paragraph 1.5 of this instruction manual and each is discussed in more detail below.

  • Page 97: Kelvin Clip Leads (7000-03)

    Connection to 7600: Connect to 7600 Cable Marking/Color Connection to DUT PH (potential, high) PH (Red/white) Positive (+) terminal of DUT IH (current, high) IH (Red) Positive (+) terminal of DUT PL (potential, low PL (Black/white) Negative (-) terminal of DUT IL (current , low) IL (Black) Negative (-) terminal of DUT...
  • Page 98 Connection to 7600: Connection to the 7600 is made through four shielded cables with BNC connectors that mate directly with the measurement terminals of the 7600. The cables are color coded to facilitate proper connections as detailed below. Connect to 7600 Cable Marking/Color Connection to DUT PH (potential, high)

  • Page 99: Alligator Clip Leads (7000-04)

    2.8.5 Alligator Clip Leads (7000-04) The 7000-04 Alligator Clip Leads is generally used to connect to devices that are multi- terminal, physically large or otherwise unsuited for one of the remote test fixtures. The lead set is consists of a BNC to BNC cable, four banana plug adapters and four alligator clips.

  • Page 100: Chip Component Tweezers (7000-05)

    2.8.6 Chip Component Tweezers (7000-05) The 7000-05 Chip Component Tweezers provides a means for handling small unleaded "chip" or SMD (surface mounted devices) passive components for testing on the 7600. They are intended for both handling small components and the means for making electrical test connection to them.

  • Page 101: Low V, Axial/Radial Lead Component Test Fixture (7000-06)

    4-terminal connection of radial and axial leaded components to the 7600. The 7000-06 consists of the test fixture and two axial lead adapters. Rotated 90 degrees as shown QuadTech Fixture Axial Lead Adapter Figure 2-57 Low V, Axial/Radial Lead Component Test Fixture For this accessory an additional accuracy must be added to the standard instrument accuracy as defined by AutoAcc.

  • Page 102: Low V, Chip Component Test Fixture (7000-07)

    2.8.8 Low V, Chip Component Test Fixture (7000-07) The 7000-07 Test Fixture, along with the BNC to BNC cable provided, is a method of convenient, reliable, guarded 4-terminal connection of chip or surface mount components. QuadTech Figure 2-58 Low V Chip Component Test Fixture Operation 2-85...
  • Page 103 Maximum Frequency: 2 MHz Typical Residual Parameters (after performing open/short at DUT terminals): R: < 1 (1 + f 2 )mΩ C: < 0.15 (1 + 0.002/f)pF L: < 10 (1 + 0.002/f)nH where f = measurement frequency in MHz Connection to 7600 (using 7000-01 or 7000-02 BNC Cable Sets): Connect to 7600 Cable Marking/Color...

  • Page 104: High Voltage Test Fixture (7000-08)

    2.8.9 High Voltage Test Fixture (7000-08) The 7000-08 Component Test Fixture, along with BNC to BNC cable provided, is an accessory for QuadTech's 7600. The fixture simplifies the connection and measurement of leaded and chip components while maximizing operator ease of use and safety. The...

  • Page 105: Calibration Kit (7000-09)

    5.97 kohm resistor and both 500 kHz and 1 MHz for the other two resistors. 500 kHz for calibration of 7400's and 1 MHz for calibration of 7600's. Refer to Calibration Procedure, paragraph 4.4 of this manual for more detail. QuadTech QuadTech QuadTech Cal Std...
  • Page 106 2.8.11 Connection to "Type 874" Connectors There are times when it may be desirable to connect the 7600 to type 874 coaxial connectors that are found on some impedance standards. This connection can be made using either the 7000-01 or 7000-02 BNC to BNC Cable, two BNC Tees and two BNC to 874 adapters (see below).

  • Page 107: Error Messages

    Error Messages "AC CURRENT ERROR, SET TO 250µA" AC current level improperly set "AC VOLTAGE ERROR, SET TO 1V" AC voltage level improperly set "BAD CALIBRATION CODE ENTERED" Calibration code incorrectly entered "BAD CALIBRATION DATA" Calibration incorrect, re calibrate "BAD DRIVE-REQUEST STRUCTURE" Floppy not present, defective or disk not inserted "BAD OPEN CALIBRATION DATA"...
  • Page 108 "FILE DOES NOT EXIST" File name incorrect "FILE EXISTS" File already exists under the chosen name "FLOPPY DRIVE NOT READY" Floppy not present, defective or disk not inserted "FLOPPY MEDIA DEFECT" Disk defective, format or replace "FLOPPY READ FAULT" Floppy not present, defective or disk not inserted "FLOPPY SAVE ERROR"...
  • Page 109 "NO INTERLOCK SIGNAL" Open interlock connection at rear panel I/O Port "NO PASSWORD ENTERED" Password entry canceled, re-enter "NO ZERO DATA FOUND" Unit requires zeroing "PASSWORD DID NOT MATCH" Incorrect password entered "PASSWORD NOT SAVED IN RAM" Error trying to save password, repeat "PASSWORD VERIFICATION FAILURE"...
  • Page 110 "SWEEP BEGIN VALUE GREATER THAN Sweep range improperly set END" "TIME / DATE ERROR, PLEASE SET" Reset time and date "TOO MANY KEYS, LAST KEY IGNORED" Too many keys for entry field "UNABLE TO READ FROM FLOPPY" Floppy not present, defective or disk not inserted "UNABLE TO READ THAT FILENAME"...
  • Page 111 Operation 2-94...

  • Page 112: General

    Section 3 Theory General The 7600 Precision LCR Meter is built on QuadTech's I2000 standard instrument architecture that consists of a standard mechanical package, LCD display/keypad, microprocessor unit, digital I/O interface and power supply. The I2000 further incorporates the circuitry unique to the 7600, an analog instrument module and power supply.

  • Page 113: 7600 Instrument Module

    LCD Display/Keypad Panel The front panel user interface is comprised of a molded silicon rubber keypad that actuates a membrane switch assembly. The keypad is environmentally sealed, designed for long life and all keys with tactile feedback to the operator. The 2 1/2" x 4 3/4" LCD is a high resolution graphic display with on/off back light for visual clarity.

  • Page 114: I2000 Instrument Options

    Digital Signal Processor The digitized voltage and current signals are applied to a high speed Digital Signal Processor where a mathematical algorithm (similar to a Fast Fourier Transform) is used to extract the in phase and quadrature portions of the signal. This information is then used to calculate the complex impedance, Z, and the complex admittance, Y of the unknown.
  • Page 115 Theory 3-4...

  • Page 116: General

    These should be replaced annually with alkaline batteries, otherwise damage to the unit is possible as a result of battery leakage. QuadTech will assume no responsibility for instrument damage resulting from the batteries not being changed as recommended. To replace the batteries proceed as follows:...

  • Page 117: Bias Voltage Fuse Replacement

    1. Instrument power needs to be on but not in the measurement mode. CAUTION If the batteries are removed with the power off there would be no power to the non- volatile memory and important data such as stored test conditions would be lost. 2.

  • Page 118: Loss Of Display Contrast

    ERROR, SET TO 0" when the unit is first powered up. The most likely cause would be an intermittent connection to the battery due to shock or vibration. It is very important that the time and date be reset and the instrument zeroed before proceeding with any measurements.

  • Page 119: Preventive Maintenance/Cleaning

    Calibration of the 7600 Precision LCR Meter is recommended on an annual basis. If the unit is to be returned to QuadTech for factory calibration refer to paragraph 4.2 for instructions. Using the procedure below the instrument can also be calibrated by a qualified service person if traceable calibration equipment and standards are available.

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