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- Page 1 User’s Manual Model SR715 Model SR720 LCR Meters 1290-D Reamwood Avenue Sunnyvale, California 94089 Phone: (408) 744-9040 • Fax: (408) 744-9049 email: infor@thinkSRS.com • www.thinkSRS.com Copyright © 1991 by SRS, Inc. All Rights Reserved. Revision 1.5 (09/2001)
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Page 2: Table Of Contents
2-17 Passive Devices viii Series and Parallel Circuit Models 2-18 Binning Typical Measurement Setups Setting Up the Bins 2-19 How the SR715/720 Works Examples 2-20 Abridged Command List Binning Worksheet 2-21 Status Bytes xiii 2-22 Option 01: GPIB Handler Interface... - Page 3 TABLE OF CONTENTS Output Voltage Error Messages Resistance Measurement Operations Errors Capacitance Measurement Self-test Errors Calibration Errors Performance Tests Frequency Accuracy GPIB Problems Amplitude Accuracy RS232 Problems Impedance Accuracy Resistance Accuracy Fixture Maintenance Capacitance Accuracy Cleaning Performance Test Record Removing Leads Changing Radial Contacts 5-10 Calibration...
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Page 4: Safety And Preparation For Use
Rotate the fuse-pull lever back into its In addition to the line fuse, the SR715/720 has two normal position and insert the correct fuse into the other protection fuses. The external bias fuse fuse holder. - Page 5 SR715/720 LCR METER...
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Page 6: Specifications
The SR715/720 LCR Meters are multifrequency impedance measuring instruments, capable of measuring resistance, capacitance or inductance over a range of more than 13 orders of magnitude. The SR720 has a basic accuracy of 0.05% and has 5 test frequencies. The SR715 has a basic accuracy of 0.2% and 4 test frequencies. - Page 7 SR715/720 LCR METER ACCURACY Conditions At least 30 minute warm up, 23 °C ± 5 °C. Basic Accuracy SR715: 0.20% SR720: 0.05% See the Accuracy section for detailed accuracy specifications. The table below summarizes the typical use accuracy. Accuracy SR720 SR715 0.125 Ω...
- Page 8 Connects to SR715/720 fixture. SR728 BNC Fixture Adapter Provides a means to connect a remote fixture or other device to the SR715/720. Connects to SR715/720 fixture and has four 1 meter BNC cables. Polarity is indicated for biased measurements.
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Page 9: Basic Operation
SR715/720 LCR METER BASIC OPERATION This section is designed to help the user begin The SR715/720 comes with a built in fixture for making measurements with the SR715/720 LCR measuring radial leaded components, like most meter and to familiarize them with some of its capacitors, and adapters for measuring axial features. -
Page 10: Series And Parallel Circuit Models
SR715/720 LCR METER Series and Parallel circuit models Rs in capacitors is often referred to as ESR or resistor. Q varies with frequency. Q is commonly equivalent series resistance. It includes things like used to describe inductors. With resistors, often all... -
Page 11: Typical Measurement Setups
SR715/720 LCR METER Typical measurement setups The table below lists suggested test conditions for various types of components. This is by no means the only set of conditions for measuring, but is a good general "rule of thumb". Setups for Measuring Typical Parts... -
Page 12: How The Sr715/720 Works
SR715/720 LCR METER How the SR715/720 Works The SR715/720 measures the impedance of a The real and imaginary signals are obtained by component by measuring the voltage across the multiplying the voltage and current signals with a part and the current through it. This is done for reference signal in phase with Vs and one shifted both the real and imaginary (90°... - Page 13 Set (query) upper (i=0) or lower (i=1) limit of bin j (0-7) to x%. BNOM(?) i {,x} Set nominal value of bin i to x. SETUP CONTROL Returns the SR715/720 identification string. *IDN? Set bit in Standard Event Status byte when measurement complete. *OPC(?) *RCL i Recall setting i.
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Page 14: Status Bytes
SR715/720 LCR METER SENA(?) {i} Set (query) LCR Status Enable register to value i (0-255). STAT? {i} Query LCR Status byte. If i is included, only bit i is queried. STATUS BYTE DEFINITIONS name usage SERIAL POLL Ready The SR7XX is ready to perform a measurement. -
Page 15: Getting Started
GETTING STARTED SR715/720 LCR METERS This section of the manual provides an overall view SR715/720. detailed operating information on specific features, see the Operating and Programming sections. -
Page 16: Display
GETTING STARTED DISPLAY The LED display shows measured values, entered the auto parameter mode. The % LED indicates parameters, instrument status, user that the measurement is displayed as a relative messages. There are two 5-digit LED displays and deviation from an entered nominal value. Units are indicator LEDs. -
Page 17: Keypad
GETTING STARTED KEYPAD The keypad is used to select measurement BIAS conditions and to enter values. LEDs indicate the [Internal] selects a 2.0 VDC internal bias. [External] actual selects an external bias source. Pressing the measurement conditions. active key ([Internal] when internal bias is already selected or [External] when external is selected) PARAMETER turns the bias off. - Page 18 GETTING STARTED mode. The range can also be entered with the NUMERIC KEYS [0]..[9], [.], [+/-] numeric keys in the entry display. The numeric keys enter parameters and are only active when the unit is in the entry display. EQUIV CIRCUIT The [Equiv Circuit] key selects between a series or STORE and RECALL parallel equivalent circuit model of the component...
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Page 19: Fixture
GETTING STARTED FIXTURE A versatile test fixture is provided with the Axial leaded devices (leads at opposite ends) SR715/720 that provides wire Kelvin require the use of the axial fixture adapters. connection to most types of leaded devices. (A Kelvin connection uses two wires to carry the test... -
Page 20: Rear Panel
GETTING STARTED REAR PANEL POWER ENTRY MODULE The Power Entry Module is used to fuse the line These switches set baud rate, parity and word power, select the input voltage, and filter high length RS232 interface. frequency electrical noise. programming section for details on setting the interface. -
Page 21: Operation
OPERATION DISPLAY The SR715/720 displays both major and minor parameters simultaneously. In addition to the parameter selection, the display type may also be specified. This allows results to be shown in engineering units, deviation from a specified nominal value, or binned for sorting purposes. The display also shows values entered from the keyboard while specifying the nominal value or bin limits. -
Page 22: Series & Parallel Equivalent Circuits
OPERATION SERIES and PARALLEL EQUIVALENT CIRCUITS Any non-ideal component can be represented as a resistive component either in series or in parallel with a reactive component. Depending upon the characteristics of the component and the measurement frequency, either the series or parallel model will be the more accurate model. The more ideal a component is, the less the two models differ. - Page 23 (front panel inactive). ACT (activity) indicates the computer interface is active. ERR (error) indicates that a command sent to the instrument contained an error. BINNING The NOM, +LIM and -LIM LEDs indicate which parameter is being entered while configuring the SR715/720 for binning. See the section on binning for more details.
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Page 24: Test Conditions
ENTRY functions. FREQUENCY There are five selectable frequencies for the SR720 (four for the SR715): 100 Hz, 120 Hz, 1.0 kHz, 10 kHz, and 100 kHz (SR720 only). The output frequency is accurate to 100ppm (0.01%). Frequencies are set by pressing either the [UP Arrow] or [DOWN Arrow] key in the FREQUENCY section until the desired frequency LED is on. - Page 25 OPERATION been programmed with the vernier setting, none of the primary drive voltage LEDs will be on. To return to the primary output levels, press the [Select] key. The output voltage will be increased to the next highest primary level. The output voltage is applied to the device under test through a source impedance, thus, the voltage across the device is always less than or equal to the output voltage.
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Page 26: Range
RANGE The SR715/720 has 4 measurement ranges (0-3). The range may be selected manually or the unit can autorange. The table below specifies the impedance ranges for each of the measurement ranges. Each of the four ranges has source impedance of approximately the mid-scale impedance. -
Page 27: Constant Voltage
OPERATION autorange to range 0 (or range 1 for 100 kHz) and then autorange back to the appropriate range when a part is inserted in the fixture. Range holding is helpful if measurement speed is a concern or if a number of parts with similar values are being measured. -
Page 28: Bias
AC coupling capacitor of .47 µF. During this time the reading on the SR715/720 may change if it is continuously triggered. In this case, the initial readings should be disregarded. -
Page 29: External Bias
The bias supply lines are fused with a 250 mA fuse on the rear panel, next to the banana jacks. If the SR715/720 doesn't yield stable readings when the external bias switched is on, check this fuse. -
Page 30: Settling Time
'rAngE Error'. TRIGGERING The SR715/720 can make measurements continuously or in response to a trigger. To change the trigger mode, press the [Mode] key until the desired mode LED is on, either CONT or TRIGGERED. In the continuous mode the unit will trigger itself at its maximum measurement rate. -
Page 31: Store And Recall
OPERATION whenever the unit is triggered. In the triggered mode the unit will make a single measurement per trigger. STORE and RECALL [Store] and [Recall] allow nine complete instrument setups to be saved in non-volatile memory. All the test conditions, including binning configuration and open and short circuit compensation are saved. Store To store a setup, press the [Store] key, which will display the 'StorE' message in the display. -
Page 32: Connecting A Device
OPERATION CONNECTING A DEVICE The SR715/720 has a built in Kelvin fixture for measuring radial leaded components and adapters for measuring axial leaded components. The fixture provides a 4-wire Kelvin connection to the device under test to minimize stray impedances that cause measurement errors. Most components will fit into this fixture, thus eliminating the need for special fixtures. -
Page 33: Component Dimensions
Then plug the fixture adapter into the fixture, matching the polarity of the adapter to the polarity of the SR715/720. Make certain that the center clips makes contact with the center guard ground. -
Page 34: Kelvin Clips
The parts tray in front of the fixture provides a convenient place to place parts while sorting and measuring them. Connection of the SMD tweezers to the SR715/720 fixture is the same as for the Kelvin Clips. Remember, always perform open and short circuit calibration after changing the fixture setup. -
Page 35: Bnc Adapter
BNC ADAPTER The BNC Adapter Set connects the SR715/720 to other test equipment, switching networks, or remote test fixtures. The adapter connects to the test fixture in the same fashion as the Kelvin Clips and SMD Tweezers. The four coax cables are labeled: Ih (red), the + drive signal, Il (blue), the - drive signal, Vh (orange), the + sense connection, and Vl (purple), the - sense connection. -
Page 36: Suggestions For Calibration
OPERATION OPEN and SHORT CIRCUIT OR NULL CALIBRATION Compensation of stray impedances is performed by open and short circuit or fixture null calibration. This corrects for lead impedance, and fixture, cable and other stray capacitance. Null calibration corrects for all frequencies and all ranges - it is not necessary to re-calibrate for changes in frequency. -
Page 37: Smd Tweezers
OPERATION separation as it will be when making measurements. Again keep hands or other objects away from the clips while performing null cal. See the illustration above. SMD TWEEZERS SMD tweezers present a challenge to calibrate accurately, since their position can vary and the operators hands are always present when making measurements. -
Page 38: Binning
Binning configurations can also be entered over one of the computer interfaces. The SR715/720 can sort components into as many as ten separate bins - eight pass bins, a minor parameter failure bin, and a general failure bin. Binning operations can either be performed from the front panel, in the BINS display, the standard RS232 computer interface or the optional GPIB or Handler interface. -
Page 39: Setting Up The Bins
OPERATION Binning data can be entered manually using the [Bin#], [Nominal] and [Limit] keys, or over the RS232 or optional GPIB interface. A bin is defined by a bin number, with a nominal value and upper and lower limits (in percent). -
Page 40: Examples
OPERATION VALUES FOR FAIL BINS (8 & 9) To set the QDR limit value, select bin 8 (using the [Bin#] [8] [ENTER] keys) and press the [Nominal] key. This will display the present QDR limit, or '-----', in the right display and turn on the NOM LED. Input the value with the numeric keys and press the [ENTER] key. -
Page 41: Binning Worksheet
OPERATION Binning Worksheet Date: __________ Nominal value of component: ______________________ Tolerance to be sorted to: ______________________ Entered by: _______________________________________ Type of binning: Pass/Fail Nested Sequential bin # +lim -lim xxxx xxxx xxxx xxxx xxxx 2-21... -
Page 42: Option 01: Gpib Handler Interface
OPERATION Option 01: GPIB/Handler Interface GPIB Interface: Detailed information on the GPIB interface and programming examples are available in the remote programming section. Handler Interface: Introduction The handler interface for the SR720/715 allows the unit to be operated with external hardware to measure and physically sort components. - Page 43 OPERATION Mechanical Description: The handler interface is part of the Option 01 GPIB/Handler board and is accessed via a 25 pin male connector on the rear of the SR720/715. A DB25 female connector, metal housing, and plastic sheath have been provided to simplify construction of a cable to the external handler. Connector pinouts are as follows: Pin # Bin 0:...
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Page 44: Accuracy
ACCURACY DETAILED ACCURACY SPECIFICATION GUIDE CONDITIONS The following conditions must be met for the unit to meet its accuracy specifications Warm up time: > 30 minutes Temperature: 23 ± 5 °C Fixture: Built in Open & Short Circuit Calibration have been performed D <... -
Page 45: Impedance Accuracy
ACCURACY IMPEDANCE ACCURACY Accuracy of Z = ± [A x K i x K v + (K h + K l ) x 100] % Basic Impedance Accuracy Factor from graph on next page. If the unit is in the constant voltage (CV) mode, double the basic accuracy factor. - Page 46 ACCURACY...
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Page 47: R+Q Accuracy
ACCURACY R + Q ACCURACY Accuracy of R = ± [A x K i x K v + (K h + K l ) x 100] % Basic Resistance Accuracy Factor from graph. For |Q| > 0.1, multiply the basic accuracy factor by (1 + |Q|). -
Page 48: L+Q Accuracy
ACCURACY L + Q ACCURACY Accuracy of L = ± [A x K i x K v + (K h + K l ) x 100] % Basic Inductance Accuracy Factor from graph. For Q < 10, multiply the basic accuracy factor by (1 + 1/Q). -
Page 49: C+D Accuracy
ACCURACY C + D ACCURACY Accuracy of C = ± [A x K i x K v + (K h + K l ) x 100] % Basic Capacitance Accuracy Factor from graph. For D > 0.1, multiply the basic accuracy factor by (1 + D). -
Page 50: C+R Accuracy
ACCURACY C + R ACCURACY Accuracy of C = ± [A x K i x K v + (K h + K l ) x 100] % K i Table Basic Capacitance Accuracy Meas Rate Frequency Factor from graph on page 4-6. slow, med If the unit is in the constant voltage 100 Hz-1 kHz 6.25 Ω<Z m <400 kΩ... - Page 51 ACCURACY Accuracy when Holding a non-optimal Range When a component is measured outside of its nominal range (in range hold), the accuracy of the measurement is reduced. The nominal ranges are defined as approximately four times above and below the nominal impedance value.
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Page 52: Front Panel Leds
SR715/720 will respond to commands from either interface and return answers to the interface from Note: the SR715/720 must be set to 8 data bits if which the command came. All front and rear panel the binary data output formats are to be used. -
Page 53: Programming Errors
SR715/720 sends with any answer to a query is The NO COMMAND bit is a bit in the serial poll carriage return-linefeed <cr><lf> on RS232 and register that indicates that there no commands linefeed plus EOI on GPIB, except for binary waiting to be executed in the input queue. -
Page 54: Detailed Command List
The BIAS command sets the SR715/720's DC bias to off (i=0), internal (i=1), BIAS(?) {i} or external (i=2). This command will return an error if the SR715/720 is not set to a capacitance mode (C+D or C+R). The BIAS? query returns the present bias status. -
Page 55: Measurement Control Commands
MEASUREMENT RESULT COMMANDS The following commands return the results of the SR715/720's measurements. The results may be returned in either ASCII or binary format, and may or may not return measurement status information. Set OUTF command sets the format for the X commands to Verbose ASCII OUTF(?) {i} (i=0), Concise ASCII (i=1), Verbose Binary (i=2), or Concise Binary (i=3). - Page 56 Overrange. The measurement value is above the nominal range of values for this measurement range. xxxx1111 Out of Range. The value is above the SR715/720's ability to measure on this measurement range. xx00xxxx xx01xxxx xx10xxxx...
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Page 57: Binning Commands
SR715/720 is in AUTO parameter mode, an error will be generated. The BLIM command sets the SR715/720's bin limits. If i = 0 the upper limit of BLIM(?) i,j {,x} bin j is set to x %. If i = 1 the lower limit of bin j is set to x %. j may range from 0 to 7. -
Page 58: Setup & Control Commands
REMOTE PROGRAMMING SR715/720 will use the nominal value from the next lowest numbered bin with a non-zero nominal value (several bins can have the same nominal value without entering the value for each bin). The lowest numbered active bin must have its nominal value set. - Page 59 Standard Resistor Calibration Error. The standard resistor calibration value was out of range. The *TST? common query runs the SR715/720's internal self-tests. After the *TST? tests are complete, the test status is returned. The test status may have the...
- Page 60 The $RND command sets the rounding of the measurement results. If i = -1 $RND(?) {i} the SR715/720 automatically rounds to the correct number of digits given the current range, value, etc.. If i = 0, 1, 2, or 3 the measurement result will be rounded to 5 - i digits of resolution.
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Page 61: Status Byte Definitions
LCR status byte. On power on the SR715/720 may either clear all of its status enable registers or maintain them in the state they were in on power down. The action taken is set by the *PSC command and allows things such as SRQ on power up . - Page 62 REMOTE PROGRAMMING bit name usage STANDARD EVENT STATUS BYTE Set by the OPC command when all measurements are complete unused Query Error Set on output queue overflow (Too many responses waiting to be transmitted.) unused Execution err Set by an out of range parameter, or non-completion of some command due a condition such as an incorrect operating mode.
- Page 63 Once all the hardware and GPIB drivers are configured, use "IBIC". This terminal emulation program allows you to send commands to the SR715/720 directly from your computer's keyboard. If you cannot talk to the SR715/720 via "IBIC", then your programs will not run.
- Page 64 REMOTE PROGRAMMING exit (0); ibwrt (lcr, "*RST", 4L); /* reset LCR meter */ ibwrt (lcr, "MMOD1;PMOD3;FREQ0", 17L); /* set triggered mode, measure C+D, Freq = 100 Hz */ ibwrt (lcr, "outf1", 5L); /* concise ASCII output format */ ibwrt (lcr, "BIAS1", 5L); /* turn internal bias on - it may be necessary to wait for the capacitor to charge up here when measuring large capacitors */...
- Page 65 Once the hardware is configured, use "TRTEST". This terminal emulation program (supplied by CEC) allows you to send commands to the SR715/720 directly from your computer's keyboard. If you cannot talk to the SR715/720 via "TRTEST", then your programs will not run.
- Page 66 REMOTE PROGRAMMING TxGpib (sr720,"OUTF2"); /* verbose binary output */ TxGpib (sr720,"STRT;*WAI;XALL?"); /* trigger a measurement, wait until it's over, then ask for results */ MakeTalk (sr720); /* make LCR a GPIB talker */ count = 15; rarray (&status, &length, &count, data, &seg); /* read output into array data[] */ /* Check the programming section of the SR720 for detailed information on binary return formats.
- Page 67 REMOTE PROGRAMMING char cmd[25]; sprintf (cmd, "UNT UNL MLA TALK %d", address); /* make the talk command string */ transmit (&status, cmd); /* send the talk command string */ StatCheck (address); /* check interface status */ /* ********************************************************************* */ void TxGpib (int address,char *command) /* transmit command to address */ char t_string[150];...
- Page 68 Once the hardware is configured, use "TRTEST". This terminal emulation program (supplied by CEC) allows you to send commands to the SR715/720 directly from your computer's keyboard. If you cannot talk to the SR715/720 via "TRTEST", then your programs will not run.
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Page 69: Binning
REMOTE PROGRAMMING void main(void) int i, b; double rmeas, q; char string[80]; InitGpib(); /* init GPIB controller */ TxGpib (lcr, "*RST;MMOD1;PMOD1;BCLR"); /* reset LCR, triggered mode, measure R and Q, clear all bins */ /* set up the bins */ Clear();... - Page 70 REMOTE PROGRAMMING printf ("bin QDR Fail\n"); printf (" "); for (i=0; i<10; i++) printf("%d ", bin[i]); printf("\n"); /* ************************************************************************ */ void InitGpib (void) /* initialize the CEC GPIB card as controller */ int my_address, system_controller,seg; /* Find the CEC card address */ for (seg=0x4000;seg<0xF000;seg+=0x400) { if ((peek(seg,50) == 'C') &&...
- Page 71 REMOTE PROGRAMMING ch = getch (); if ((ch == 'q')||(ch =='Q')) { flushall(); exit(0); } while(ch != ' '); Erase(25,1); /* ********************************************************************* */ void Erase (int row, int num) /* Erase num rows starting at row (requires ansi.sys)*/ int i; for (i = 0;...
- Page 72 IBM PC, IBM BASIC using the RS232 interface In this example, the IBM PC serial port COM1: is used at 9600 baud. Configure the SR715/720 to 9600 baud, 8 bits, no parity before running the program. The RS232 configuration is set using switch SW1 on the rear panel.
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Page 73: Functional Tests
The first set of tests verify the basic functionality of the unit. The second set of tests verify the critical specifications of the SR715/720. The results of each section can be recorded on the test sheet located at the end of this section. -
Page 74: Self Test
(1.0 VRMS = 2.83 V peak to peak). There should be no irregularities in the wave form. 4) Change the amplitude setting of the SR715/720 to 0.25 and 0.10 V and verify that the output is within 2% of nominal. - Page 75 5) Repeat for 10 kHz and 100 kHz (SR720 only). At 10 kHz the tolerance is 1.15% (SR720) or 1.35% (SR715). For 100 kHz the tolerance is 1.25% (SR720 only). D values should be below .001 for 10 kHz and .01 for 100 kHz.
- Page 76 This test measures the accuracy of the different output frequencies. They should be within 0.01% (100 ppm) of the nominal value. 1) Set the SR715/720 to its default conditions ([Recall] [0] [ENTER]). Set the unit to constant voltage mode, 1 kHz and remove any part from the fixture.
- Page 77 (between .245 and .255 and between .098 and .102 respectively). Record the result. 5) Set the AC/DC volt meter to DC volts. Set the SR715/720 to C+D, 100 kHz, 0.10 Drive Voltage, Internal Bias on. Verify that the DC voltage is 2.0 VDC ± 2%.
- Page 78 Capacitance Accuracy 1) Connect the SR728 Fixture Adapter to the SR715/720. Install a BNC to stacking banana plug adapter on the end of each BNC cable. Tape over (or cut off) the ground leads of the plugs connected to the orange (Vh) and purple (Vl) cables.
- Page 79 PERFORMANCE TESTS Capacitance Accuracy Table capacitance Frequency Range SR715 tol. + C tol. SR720 tol. + C tol. 1.0n 1 kHz .99780n - 1.0022n .99930n - 1.0007n 1.0n 10 kHz .99680n - 1.0032n .99880n - 1.0012n 1.0n 100 kHz ----------------- .99780n - 1.0022n...
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Page 80: Frequency Accuracy
PERFORMANCE TESTS SR715/720 PERFORMANCE TEST RECORD Serial # __________________ Date _________________ Tested by _________________________ Equipment used _____________________________________________________________________ ____________________________________________________________________________________ Functional Tests Pass Fail Front Panel Test ____ ____ Self Test ____ ____ Output Voltage ____ ____ 24.9 Ω Resistance Test ____ ____ 400 Ω... -
Page 81: Resistance Accuracy
PERFORMANCE TESTS Resistance Accuracy resistance range conditions Value Pass Fail 10.0 1 kHz series ____________ ____ ____ 25.0 1 kHz series ____________ ____ ____ 25.0 10 kHz series ____________ ____ ____ 25.0 100 kHz series* ____________ ____ ____ 100.0 1 kHz series ____________ ____ ____ 100.0... -
Page 82: Calibration
(they may be changed via the computer interfaces). The amplitude calbytes are directly adjustable from the front panel. For the SR715 only: The values for the 100 kHz calbytes are set to zero and do not need to be adjusted. - Page 83 CALIBRATION Amplitude Calbytes Amplitude Calbyte Numbers 0 thru 94 Range 0 - 255 (1 byte) Amplitude Calbyte Organization Frequency Amplitude 100 Hz 120 Hz 1 kHz 10 kHz 100 kHz 0.10V 0.15V 0.20V 0.25V 0.30V 0.35V 0.40V 0.45V 0.50V 0.55V 0.60V 0.65V 0.70V...
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Page 84: Amplitude Calibration
DVM. Do not connect either end to ground. Set the meter to AC volts, autoranging. Set the SR715/720 to its default conditions ([Recall] [0] [ENTER]). Set the unit to constant voltage mode. -
Page 85: Frequency Calibration
The clock correction factor is stored in parts per million (ppm). 1) Set the SR715/720 to its default conditions ([Recall] [0] [ENTER]). Set the unit to constant voltage mode, 1 kHz and remove any part from the fixture. -
Page 86: Standard Resistor Calibration
This procedure determines the value of the internal standards for the different frequencies and ranges. The SR715/720 does this by measuring a precisely known resistor and recomputing the values it uses when calculating the impedance of a part. These values are the primary accuracy standard of the instrument, so the exact value of the calibration resistor, both real and imaginary parts, must be known. -
Page 87: Nothing Happens At Turn On
TROUBLESHOOTING Nothing Happens At Turn On Make sure that the power entry module on the rear panel is set for the ac line voltage for your region, that the correct fuse is installed, and that the line cord is inserted all the way into the power entry module. The selected line voltage may be seen through the clear window, just below the fuse. -
Page 88: Error Messages
TROUBLESHOOTING Error Messages The following lists explain all of the error messages that the SR715/720 can generate. The messages are divided into operational errors (errors in using the instrument), self-test errors, and calibration errors. The messages are listed alphabetically. Operational Errors These error messages may appear during normal front panel operation and generally are warnings for incorrect operation. - Page 89 TROUBLESHOOTING Message Status Meaning Code Err XX The SR715/720's ROM has a checksum error. XX is the checksum value. CPU Error The SR715/720 has detected a problem in its CPU. Data Error CPU RAM failed read/write test. Det Error The square wave multiplier failed its DC rejection test.
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Page 90: Calibration Errors
SR715/720 must be set to match that expected by the controlling computer. The default GPIB address is 17, so it is a good idea to use this address when writing programs for the SR715/720. Any address from 0 to 30 may be set using the rear panel switches SW2. -
Page 91: Cleaning
MAINETENANCE BUILT IN FIXTURE CLEANING Several times a year, both the radial and axial test fixtures should be examined for any build up of waxy coatings from lead material. If the contacts appear dirty they should be cleaned. To clean both fixtures, use a thick piece of paper or cardboard moistened with isopropyl alcohol or a mild cleaning solvent. - Page 92 MAINTENANCE After the fixture bracket is detached, remove the 1/4" nuts holding the fixture to the bracket. Slide the plastic lead catcher off the mounting studs and wires. The two halves of the fixture can now be removed. There are springs inside the fixture so take care to avoid losing any parts when sliding them out of the bracket.
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Page 93: Cleaning
MAINETENANCE over the fixture and back of the unit. Finally, replace the four screws at the corners of the unit. SURFACE MOUNT TWEEZERS CLEANING To clean the SMD Tweezers, rub an eraser lightly across the inside surfaces of the tips. Blow any residue off the tip. REPLACEMENT The tips of the tweezers may need to be replaced from time to time. - Page 94 MAINTENANCE...
- Page 95 SR715/720 PARTS LIST Main Board Parts List REF. SRS PART# VALUE DESCRIPTION BT801 6-00001-612 BR-2/3A 2PIN PC Battery C 101 5-00243-540 .47U Capacitor, Metallized Polycarbonate C 102 5-00243-540 .47U Capacitor, Metallized Polycarbonate C 103 5-00243-540 .47U Capacitor, Metallized Polycarbonate C 104 5-00253-525 .0082U...
- Page 96 SR715/720 PARTS LIST REF. SRS PART# VALUE DESCRIPTION C 610 5-00022-501 .001U Capacitor, Ceramic Disc, 50V, 10%, SL C 611 5-00022-501 .001U Capacitor, Ceramic Disc, 50V, 10%, SL C 612 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 701 5-00262-548 .01U AXIAL...
- Page 97 SR715/720 PARTS LIST REF. SRS PART# VALUE DESCRIPTION C 1217 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 1218 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 1219 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 1220 5-00225-548 .1U AXIAL...
- Page 98 SR715/720 PARTS LIST REF. SRS PART# VALUE DESCRIPTION C 1277 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 1278 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 1282 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 1283 5-00225-548 .1U AXIAL...
- Page 99 SR715/720 PARTS LIST REF. SRS PART# VALUE DESCRIPTION D 1313 3-00547-310 RED COATED LED, Coated Rectangular D 1314 3-00547-310 RED COATED LED, Coated Rectangular D 1315 3-00547-310 RED COATED LED, Coated Rectangular D 1316 3-00547-310 RED COATED LED, Coated Rectangular...
- Page 100 SR715/720 PARTS LIST REF. SRS PART# VALUE DESCRIPTION J 604B 0-00321-035 BLACK BANANA JACK J 901 1-00139-130 28 PIN DIL Connector, Male J 902 1-00140-130 18 PIN DIL Connector, Male J 1001 1-00016-160 RS232 25 PIN D Connector, D-Sub, Right Angle PC, Female...
- Page 101 SR715/720 PARTS LIST REF. SRS PART# VALUE DESCRIPTION R 118 4-00662-407 2.00M Resistor, Metal Film, 1/8W, 1%, 50PPM R 119 4-00130-407 1.00K Resistor, Metal Film, 1/8W, 1%, 50PPM R 120 4-00031-401 Resistor, Carbon Film, 1/4W, 5% R 121 4-00080-401 Resistor, Carbon Film, 1/4W, 5%...
- Page 102 SR715/720 PARTS LIST REF. SRS PART# VALUE DESCRIPTION R 610 4-00079-401 4.7K Resistor, Carbon Film, 1/4W, 5% R 611 4-00142-407 100K Resistor, Metal Film, 1/8W, 1%, 50PPM R 612 4-00380-407 6.34K Resistor, Metal Film, 1/8W, 1%, 50PPM R 613 4-00669-407...
- Page 103 SR715/720 PARTS LIST REF. SRS PART# VALUE DESCRIPTION U 107 3-00423-340 5534 Integrated Circuit (Thru-hole Pkg) U 108 3-00383-340 LM6321 Integrated Circuit (Thru-hole Pkg) U 109 3-00371-340 DG444 Integrated Circuit (Thru-hole Pkg) U 110 3-00091-340 LF412 Integrated Circuit (Thru-hole Pkg)
- Page 104 SR715/720 PARTS LIST REF. SRS PART# VALUE DESCRIPTION U 901 3-00401-340 74HCT244 Integrated Circuit (Thru-hole Pkg) U 902 3-00401-340 74HCT244 Integrated Circuit (Thru-hole Pkg) U 903 3-00406-340 74HCT374 Integrated Circuit (Thru-hole Pkg) U 904 3-00406-340 74HCT374 Integrated Circuit (Thru-hole Pkg)
- Page 105 SR715/720 PARTS LIST REF. SRS PART# VALUE DESCRIPTION 0-00231-043 #4 SHOULDER Washer, nylon 0-00241-021 4-40X3/16PP Screw, Panhead Phillips 0-00243-003 TO-220 Insulators 0-00249-021 6-32X1-1/2PP Screw, Panhead Phillips 0-00256-043 #6 SHOULDER Washer, nylon 0-00259-021 4-40X1/2"PP Screw, Panhead Phillips 0-00265-052 9-1/2" #22 BLK...
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Page 106: Parts List
SR715/720 PARTS LIST Miscellaneous and Chassis Assembly Parts List REF. SRS PART# VALUE DESCRIPTION U 802 3-00449-342 27C256-120 EPROM/PROM, I.C. 0-00079-031 4-40X3/16 M/F Standoff 0-00187-021 4-40X1/4PP Screw, Panhead Phillips 0-00351-029 4-40X1/4TRUSSPH Screw, Truss Phillips 0-00400-026 4-40X7/8 PP Screw, Black, All Types...
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