Extech Electronics 7611 Operation Manual

Line leakage tester

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7611

LINE LEAKAGE TESTER

OPERATION MANUAL

EV 1.11

Printed Dec. 2005

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Page 1 7611 LINE LEAKAGE TESTER OPERATION MANUAL EV 1.11 Printed Dec. 2005...
Page 3: Warranty Policy
(1) year from date of shipment. During the warranty period, you must return the instrument to Extech Electronics Co., or its branches or its authorized distributor for repair. Extech Electronics Co., reserves the right to use its discretion on replacing the faulty parts or replacing the assembly or the whole unit.
Page 5: Table Of Contents
Index Chapter 1 : Introduction ……………………………………1 Chapter 2 : Specifications …………………………………..10 Chapter 3 : Front And Rear Panels ……………………….13 Chapter 4 : Installation …………………………………….18 Chapter 5 : Quick Start …………………………………….20 Chapter 6 : General Setup Procedures ……………………23 Chapter 7 : Test Parameter Setup Procedures ……………25 Chapter 8 : System Parameter Setup ………………………30 Chapter 9 : Operation Procedure ………………………….34 Chapter 10 : LCD Displayed Messages ……………………37...
Page 7: Chapter 1 : Introduction
INTRODUCTION CHAPTER 1 : INTRODUCTION 1.1 GENERAL: This product and its related documentation must be reviewed for familiarization with safety markings and instructions before operation. This product is a Safety Class I instrument (provided with a protective earth terminal). Before applying power verify that the instrument is set to the correct line voltage (110 or 220) and the correct fuse is installed.
Page 8 The instrument and its power cord, test leads, and accessories must be returned at least once a year to a Extech Electronics Co., Ltd. authorized service center for calibration and inspection of safety related components. Extech Electronics Co., Ltd. will not be held liable for injuries suffered if the instrument is not returned for its annual safety check and maintained properly.
Page 9 INTRODUCTION Shipment Environment Original Packaging: Please retain all original packaging materials that you originally received. If you are returning your instrument to us for servicing please repackage the instrument in its original container. Please enclose the instrument with all options, accessories and test leads.
Page 10 The Model 7611 Line Leakage Tester provides the capability of meeting the line leakage test specified in the following standards; UL 544, IEC 950, UL 1950, IEC 601-1, UL 2601, UL 1563, UL 3101, IEC 1010 and others.
Page 11 The only way to be sure you are shipping safe products is to test each product at the end of the production line. The built in switching matrix interface allows the 7611 to be interconnected with other AR safety testers to form a complete safety testing system.
Page 12 INTRODUCTION During the test, all "stray" current flow to ground is measured. If, during the time the component is tested, stray current flow remains within specified limits, the device is assumed to be safe under normal conditions. The basic product design and use of the insulating material will protect the user against electrical shock.
Page 13 INTRODUCTION alternately in both polarities which more closely simulates stresses the product will see in real use. Since AC testing cannot charge a capacitive load the current reading remains consistent from initial application of the voltage to the end of the test. Therefore, there is no need to gradually bring up the voltage since there is no stabilization required to monitor the current reading.
Page 14 INTRODUCTION have failure shut off circuitry which will indicate failure almost immediately if the total current reaches the leakage threshold during the initial charging of the product under test. Since a DC hipot does charge the item under test it becomes necessary to discharge the item after the test.
Page 15 INTRODUCTION • Pinholes in Insulation • Inadequate Spacing of Components • Pinched Insulation 1.7 The Ground Bond Test The Ground Bonding test determines whether the safety ground circuit of the product under test can adequately handle fault current if the product should ever become defective.
Page 16: Chapter 2 : Specifications
SPECIFICATIONS CHAPTER 2 : SPECIFICATIONS 2.1 Functional Specifications of 7611 CURRENT MEASUREMENT Frequency Range DC – 1MHz CMRR >40 dB @1MHz, differential mode Input Impedance/Capacitance >1MΩ / <200pf LEAKAGE CURRENT Range Resolution Accuracy (DC - 200KHz) Accuracy(10KHz - 1MHz) 0.0-999.9, µA ±(5% of reading+5counts)
Page 17 SPECIFICATIONS Input ：Test, Reset, Memory 1, 2 ,3 PLC Remote Control Output --- Pass, Fail, Processing Memory 10 Memories, 8 step/memory 16×2 LCD with back light Display Key Lock To prevent unauthorized alteration of the test Parameters Calibration Build-in software and external calibrated meters Interface GPIB/ RS232 (option) Alarm Volume Setting...
Page 18 SPECIFICATIONS 2.2 KEY FEATURES & BENEFITS SUMMARY FEATURES BENEFITS Provides 8 of the most common No need to manually set up the test or to switch test safety tests leads around. The 5 most common measuring A versatile tester that can be set-up to meet devices are built-in and can be multiple specifications without the need for selected through software control...
Page 19: Chapter 3 : Front And Rear Panels
FRONT AND REAR PANELS CHAPTER 3 : FRONT AND REAR PANELS 3.1 FRONT PANEL DESCRIPTION 1. POWER SWITCH: Rocker-style switch with international ON ( l ) and OFF (O) markings. 2. RESET BUTTON: This is a momentary contact switch. If a failure condition occurs during a test you will need to reset the system to shut off the alarm and to signal the system that you are aware of a failure condition before you can proceed to the next test or change any of the set-up parameters.
Page 20 FRONT AND REAR PANELS 5. LINE: Use this key to activate the NEUTRAL, REVERSE, and GROUND relays to set up the steps within each memory for the single fault and normal conditions. 6. MD CIRCUIT: Use this key to select the Measuring Device (MD) circuit A through F to simulate different body impedances.
Page 21 FRONT AND REAR PANELS 12. LOCAL: To change the operation of the instrument from remote to the Local mode. 13. EXIT: To exit any menu or to clear an unwanted entry in a parameter field. 14. SETUP: Use this key to enter the setup menu. View or change the PLC Remote status, display contrast, alarm volume, GPIB address, Fail Stop setting, Single Step, and Memory Lock function.
Page 22 FRONT AND REAR PANELS 24. REVERSE LED: This indicator will illuminate when the input power polarity to the DUT is reversed. 25. GROUND LED: This indicator will illuminate when the ground conductor to the DUT is open. This is one of the single fault conditions which is simulated during the leakage test.
Page 23 FRONT AND REAR PANELS external measuring device may allow the operator to test to a different standard, which calls for a different measuring device, or to easily change the measuring device if the standard requirements change. 6. INPUT POWER SWITCH: Line voltage selection is set by the position of this switch.
Page 24: Chapter 4 : Installation
If the shipping carton is damaged, inspect the contents for visible damage such as dents, scratches or broken meters. If the instrument is damaged, notify the carrier and the Extech Electronics Co., Ltd. customer support department immediately. Please save the shipping carton and packing material for the carriers inspection. Our customer support department will assist you in the repair or replacement of your instrument.
Page 25 INSTALLATION 4.2.2 Operating Environment This instrument may be operated in temperatures from 32° - 104° F (0° - 40° C). Relative humidity of 20 to 80%. Altitude up to 6500 feet (2,000 meters). 4.3 STORAGE AND SHIPMENT 4.3.1 Environment This instrument may be stored or shipped in environments with the following limits: Temperature......
Page 26: Chapter 5 : Quick Start
GENERAL SETUP PROCEDURES CHAPTER 5 : QUICK START This quick start guide assumes the operator has some familiarity with automated testing and desires to use the "default" settings on the instrument. The default settings shown will remain in memory unless you choose to override them with your own test program. The instrument default settings that appear in memories 1-40 are as follows: 5.1 DEFAULTS Type...
Page 27 GENERAL SETUP PROCEDURES 5.2.3 Check to be sure the correct input line voltage has been selected on the rear panel. Either 115 volts AC or 230 volts AC. Connect the power input plug CAUTION into its socket on the rear panel of the instrument. Connect the male end of the plug to the outlet receptacle.
Page 28 GENERAL SETUP PROCEDURES 5.2.5 Turn on the POWER switch located on the lower left hand side of the front panel. Upon powering up the instrument, all LEDs on the front panel will be lit for visual inspection. If the instrument defaults parameters are not acceptable, refer to the OPERATION section for detailed instructions on setting up testing parameters.
Page 29: Chapter 6 : General Setup Procedures
GENERAL SETUP PROCEDURES CHAPTER 6 : General Setup Procedures 6.1 Password Setting Press and hold the SETUP key while power on the instrument, the program will enter the Password setting mode. The display will show: Password Password X X X X Range : 0 - 9 9 9 9 Range : 0 - 9 9 9 9 The Password can be any four (4) digit number.
Page 30 GENERAL SETUP PROCEDURES If the Memory Lock function is set to ON, the Memory selection Menu will be disabled when in the Lock Mode. If the Memory Lock is set to OFF, the Memory selection Menu will be enabled when in the Lock Mode. Different memories can be recalled but the test parameters or steps cannot be changed.
Page 31: Chapter 7 : Test Parameter Setup Procedures
TEST PARAMETER SETUP PROCEDURES CHAPTER 7 : Test Parameter Setup Procedures Before going to setup the Test Parameters, make sure that the key lock function is set to Unlock mode, then follow this procedures to setup the Test Parameters. 7.1 High Trip The High current trip limit is used to program the maximum allowable leakage current limit for each configuration that has been selected for each step.
Page 32 TEST PARAMETER SETUP PROCEDURES 7.4 Line Configuration The LINE configuration is determined by the relays S1, S2 and S3 shown in figure 1 below. The three relays can be configured into eight possible combinations. The three relays are represented on the front panel by the three LEDs (NEUTRAL, REVERSE, and GROUND) to the left of the display.
Page 33 The Measuring Device is the human body impedance circuit that is specified in the agency specification for leakage current tests. The following table indicates the measuring device letter designation used by 7611 and the appropriate agency standard that it correlates to.
Page 34 TEST PARAMETER SETUP PROCEDURES Designation Agency Specification Application UL544 Non Patient equipment Medical Equipment UL 544 Patient care Medical Equipment equipment IEC601-1、UL2601、 Medical Equipment EN60601-1 UL 1563 Electric Spas, Equipment Assemblies and Associated Equipment IEC 1010, UL 3101. Laboratory Equipment. IEC 950, UL 1950, EN 60950 Information Technology.
Page 35 TEST PARAMETER SETUP PROCEDURES 1.5K Ω 0.22 µ F 10K Ω 0.022 µ F 500 Ω MD = E The display will indicate the Measuring Device in the center of the first line of the LCD display. The Measuring Device is indicated with letters A through F. Measuring Device A will be displayed as follows: 1 .
Page 36: Chapter 8 : System Parameter Setup
SYSTEM PARAMETER SETUP CHAPTER 8 : System Parameter Setup Use the SETUP key to progress through the menu of System Parameters. Successive key presses will advance the menu forward. The sequential forward menu items are PLC Remote, Contrast, Volume, Address, Fail Stop, Single Step, and Memory Lock. The setting of system parameters affect the operating conditions of the instrument and are separate from the functional settings.
Page 37 SYSTEM PARAMETER SETUP Use the numeric keys to enter the LCD Contrast level. The program will change the LCD Contrast immediately when the key is pressed, so the setting can be viewed. Change the LCD Contrast again or press the SETUP or ENTER key to advance to the Volume setting, or press the EXIT key to exit from the LCD Contrast setting to the operation mode.
Page 38 SYSTEM PARAMETER SETUP If the wrong address is entered, press the EXIT key to erase last input and return to previous address. Press the EXIT key second time to exit from the address setting to the operation mode or press the SETUP key to advance to the Fail Stop selection. 8.5 Fail to Stop/Continue Press the SETUP key to advance the menu to the Fail Stop parameter.
Page 39 SYSTEM PARAMETER SETUP 8.6 Single Step Press the SETUP key to advance the menu to the Single step parameter. The display will show: Single Step = ON Single Step = OFF ENTER to select ENTER to select Use the ENTER key to select the Single step mode. After the selection of Single step mode, press the SETUP key to advance to the Memory Lock selection, or press the EXIT key to exit from the Single step selection to the operation mode.
Page 40: Chapter 9 : Operation Procedure
OPERATION PROCEDURE CHAPTER 9 : Operation Procedure 9.1 Setup Before the operation of this instrument, make sure that all Test Parameters have been set properly according to the Test Parameters Setup Procedures. Also check the system setting of Remote Control, LCD Contrast, Alarm Volume, Fail Stop, Single Step, and Memory Lock.
Page 41 OPERATION PROCEDURE The dotted line at the Probe HI output illustrates the connection for an ENCLOSURE LEAKAGE TEST required by the agencies. The Probe HI connection could also be used together with the Probe LO connection to perform other leakage tests that are not illustrated here. Check your connections to be sure they are making good contact.
Page 42 OPERATION PROCEDURE If four or more memories are connected together (more than an 16 step process) then only the first 16 steps executed in the process will be stored into the results memory. The results from the steps executed after the first 16 steps in the process will not be retrievable.
Page 43: Chapter 10 : Lcd Displayed Messages
LCD DISPLAYED MESSAGES CHAPTER 10 : LCD Displayed Messages 10.1 Test In Process After pressing the test button to initialize the test, the TEST light on the right side of the instrument will illuminate. The instrument will indicate the test is processing as follows: T e s t 2 2 2 s 1 1 0 .
Page 44 LCD DISPLAYED MESSAGES 10.5 Low Limit Failure If the leakage current of the item under test less than the LO-Trip setting, the unit will indicate a failure at the end of the delay time by illuminating the FAIL indicator and activating the alarm. All relays will be deactivated to disable voltage to the DUT.
Page 45 LCD DISPLAYED MESSAGES 10.8 Line Voltage Overload This failure condition will interrupt the delay cycle. The delay time will not be completed because the line over-voltage failure is a failure that requires an immediate shutdown. If the line voltage of the DUT input exceeds the maximum limit of DUT voltage, the unit will indicate failure by illuminating the FAIL indicator and activating the alarm.
Page 46: Chapter 11 : Remote Operation
RS232 & GPIB INTERFACE CHAPTER 11 : REMOTE OPERATION Two 9 pin “D” type connectors are mounted on the rear panel which provide REMOTE- I/O control and information. These connectors mate with standard 9 pin D-subminiature connector provided by the user. The output mates to a male (plug) connector while the input mates to a female (receptacle) connector.
Page 47 REMOTE OPERATION PASS - The relay contact closes the connection between pin (1) and pin (2) after detecting that the item under test passed all tests. The connection is opened when the next test is initiated or the reset function is activated. FAIL - The relay contact closes the connection between pin (3) and pin (4) after detecting that the item under test failed any test.
Page 48: Chapter 12 : Rs232 & Gpib Interface
232 interface option can be substituted for the GPIB interface. The RS-232 interface also uses the same command list as the GPIB with the exception of the SRQ functions. Please refer to the Option section of this manual for details on the 7611 options. 12.1 GPIB Messages There are typically two types of messages that GPIB devices use to communicate with other interconnected GPIB devices;...
Page 49 RS232 & GPIB INTERFACE DAV (data valid) tells when the signals on the data lines are stable (valid) and can be accepted safely by devices. Interface Management Lines: Five lines are used to manage the flow of information across the interface. ATN (attention) ATN is driven true by the controller when it uses the data lines to send commands, and drivers ATN false when a Talker can send data messages.
Page 50 Each device on the GPIB (IEEE-488) interface must have a unique address. You can set the address of the 7611 to any value between 0 and 30. The address is set to 5 when the instrument is shipped from the factory. The address can only be set from the front panel.
Page 51 12.8 7611 GPIB Interface Command List When the GPIB controller sends a correct command beginning with an “S” or “F” the instrument will echo back the identical command string. A GPIB read command must be sent after the command string to view this echo response.
Page 52 RS232 & GPIB INTERFACE Line Configuration Settings Command Configuration NEUTRAL REVERSE GROUND Fault Normal Fault Fault Fault Fault Fault Normal Normal Fault Fault Normal Normal Normal Fault Normal Fault Fault Normal Normal Normal Normal Fault Normal Probe Configuration Settings Command Configuration Measurement from ground to line Measurement from Probe-HI to line...
Page 53 RS232 & GPIB INTERFACE Tester. After the command is sent a GPIB read command must follow to retrieve the data from the instrument in GPIB operation. In RS-232 operation the Line Leakage Tester will automatically send the results to the data buffer at the controller.
Page 54 RS232 & GPIB INTERFACE detected that an enabled SRQ has been met and therfore has requested service. Bit 4,5, and 7 are not used and will be set to false or 0 for all status reads. After the status byte has been read from the instrument the RQS bit will be cleared to 0 and the remaining bits will be unchanged.
Page 55: Chapter 13 : Options
On the rear panel of the instrument you will find a label that contains the option code. For example your options code would appear as follows: fitted with option 01 .............. OPT: 01 fitted with option 01 and 02............ OPT: 0102 7611 Options Option List Code Description RS232 Interface 01 RS232 Interface This option may be substituted for the standard GPIB interface.
Page 56 CALIBRATION PROCEDURES When sending command over the RS232 bus the 7611 will echo a response string identical to the string that was sent if the transfer was recognized and accepted by the instrument. This allows for software handshaking, to monitor and control data flow.
Page 57: Chapter 14 : Calibration Procedures
CALIBRATION PROCEDURES CHAPTER 14 : CALIBRATION PROCEDURES 14.1 Calibration Press the calibration button on the rear panel when the display shows: Calibrate 7611 Press CAL button A complete calibration includes: 1. Meter auto null 2. Meter gain calibration 3. Meter ratio auto check 4.
Page 58 CALIBRATION PROCEDURES 14.2.2 EEPROM Initialization Press the SETUP key, the program will advance to the EEPROM Initialization selection mode. The display will show: I n i t i a t e E E P R O M Press ENTER The EEPROM initialization will restore all memory locations with default calibration data.
Page 59 There should not be any DUT input voltage during the Auto Zero calibration. Press TEST and wait for the 7611 to check the zero of each range. The first line shows the range. Two numbers appear on the second line. The number on the left (NU=XX) is the auto-null DAC setting that minimizes the RMS to DC converter output offset.
Page 60 Ratio check TEST to start Press the Test button to start the process. In this procedure, 7611 uses the gain calibration data from procedure 2 to calibrate other ranges. It is fully internal and automatic. There is a dedicated DAC for the ratio check. During the ratio check, 7611 displays the raw ADC readings.
Page 61 This is similar to the gain calibration where a known voltage source is applied to the DUT power input. Apply 60Hz, 120 V rms to the DUT power input. Then press the ENTER key. The 7611 shows the measured voltage. XXX.X V Enter Line Volt Key in the correct voltage then press the ENTER key.
Page 62 CALIBRATION PROCEDURES Press the Enter Key the display will show: MD:B, I= XXXX µA Enter probe µA This process continues and is the same for all Measuring Devices A through F. 14.3 Finished Once all the calibration procedures are complete, then press the EXIT key to return to the Calibration Main Menu.