Table of Contents
Advertisement
Quick Links
High Withstand Voltage Tester
MODEL 7470 (10KV AC ONLY HIPOT)
MODEL 7472 (12KV DC ONLY HIPOT)
MODEL 7473 (20KV AC ONLY HIPOT)
MODEL 7474 (20KV DC ONLY HIPOT)
Operation Manual
PHONE: 886-26570123
EXTECH Electronics Co., Ltd.
FAX: 886-26573066
11F-1, No. 408, Ruiguang Rd., Neihu District,
Website: http://www.extech-electronics.com
Taipei 114, Taiwan
EV 1.02
Advertisement
Table of Contents
Related Manuals for Extech Instruments 7470
Summary of Contents for Extech Instruments 7470
- Page 1 High Withstand Voltage Tester MODEL 7470 (10KV AC ONLY HIPOT) MODEL 7472 (12KV DC ONLY HIPOT) MODEL 7473 (20KV AC ONLY HIPOT) MODEL 7474 (20KV DC ONLY HIPOT) Operation Manual PHONE: 886-26570123 EXTECH Electronics Co., Ltd. FAX: 886-26573066 11F-1, No. 408, Ruiguang Rd., Neihu District, Website: http://www.extech-electronics.com...
-
Page 3: Table Of Contents
2. GETTING STARTED ..................17 2.1. Unpacking and Inspection..................17 2.2. Installation ....................... 19 3. SPECIFICATIONS AND CONTROLS ...............21 3.1. Functional Specifications ..................21 3.1.1 7470 Functional Specifications ................21 3.1.2 7472 Functional Specifications ................22 3.1.3 7473 Functional Specifications ................23 3.1.4 7474 Functional Specifications ................ - Page 4 7.2. Additional Displayed messages for DC units ............51 7.3. BUS Remote message ................... 51 7.4. Fatal Error ....................... 52 7.5. Output Error ......................52 8. CONNECTION OF REMOTE I/O...............53 8.1. Signal Outputs on Remote I/O ................53 8.2. Signal Inputs of Remote I/O and Memory Access ..........54 9.
-
Page 5: Introduction
1. Introduction 1.1. Warranty Policies EXTECH ELECTRONICS CO., LTD., certifies that the instrument listed in this manual meets or exceeds published manufacturing specifications. This instrument was calibrated using standards that are traceable to the National Institute of Standards Taiwan. Your new instrument is warranted to be free from defects in workmanship and material for a period of (2) years from date of shipment. -
Page 6: Safety Symbols
1.2. Safety Symbols 1.2.1. Product Marking Symbols Product will be marked with this symbol when it is necessary to refer to the operation and service manual in order to prevent injury or equipment damage. Product will be marked with this symbol when hazardous voltages may be present. - Page 7 milliamperes, microamperes, nanoamperes, or picoamperes. Symbol = I Dielectric: An insulating material that is positioned between two conductive materials in such a way that a charge or voltage may appear across the two conductive materials. Direct Current, DC: Current that flows in one direction only. The source of direct current is said to be polarized and has one terminal that is always at a higher potential than the other.
-
Page 8: Safety
Return: The path by which current returns to a source. RMS: The Root Mean Squared value of a voltage or current waveform. An RMS waveform delivers the same amount of energy to a load as a DC waveform of the same value. - Page 9 Service Interval The instrument, its power cord, test leads, and accessories must be returned at least once a year to an Extech authorized service center for calibration and inspection of safety related components. Extech will not be held liable for injuries suffered if the instrument is not properly maintained and safety checked annually.
- Page 10 material such as clear acrylic, so that the item being tested is within the guards or enclosure during the test. If possible, the guards or enclosure should also contain safety switches that will not allow the tester to operate unless the guards are in place or the enclosure closed.
- Page 11 NFPA 70E OSHA 1910 subpart (S) EN50191 Dress Operators should not wear jewelry that could accidentally complete a circuit. ESD protocols should not be observed while performing electrical safety tests. Intentionally grounding the test operator could lead to a harmful or fatal electric shock. Medical Restrictions Personnel with heart ailments or devices such as pacemakers should be informed that the voltages and currents generated by the...
-
Page 12: Introduction To Product Safety Testing
1.4.5. Device Under Test Never touch the Device Under Test (DUT) or anything connected to it while high voltage is being applied by the hipot. When testing with DC, always discharge the capacitance of the item under test and anything the high voltage may have contacted–such as test fixtures–before handling it or disconnecting the test leads. -
Page 13: The Different Types Of Safety Tests
the Association of German Electrical Engineers (VDE) and (TÜ V), the Japanese Standards Association (JSI). These same agencies may also require that an insulation resistance test and high current ground bond test be performed. 1.6. The Different Types of Safety Tests 1.6.1. - Page 14 on every item as it comes off the production line. The hipot tester must also maintain an output voltage between 100% and 120% of specification. The output voltage of the hipot must have a sinusoidal waveform with a frequency between 40 to 70 Hz and has a peak waveform value that is not less than 1.3 and not more than 1.5 times the root-mean-square value.
- Page 15 Another advantage of AC testing is that since AC voltage cannot charge a load there is no need to discharge the item under test after the test. AC testing disadvantages One disadvantage of AC testing surfaces when testing capacitive products. Again, since AC cannot charge the item under test, reactive current is constantly flowing.
- Page 16 to AC. When performing AC hipot tests the product under test is actually tested with peak voltages that the hipot meter does not display. This is not the case with DC testing since a sinewave is not generated when testing with direct current. In order to compensate for this most safety agencies require that the equivalent DC test be performed at higher voltages than the AC test.
- Page 17 Compliance agency requirements vary on how different products are to be tested. Most specifications call for test currents of between 10 and 30 amps. Test voltages at these currents are typically required to be less than 12 volts. Maximum allowable resistance readings of the safety ground circuit are normally between 100 and 200 milliohms.
-
Page 18: Key Features And Benefits
(MD). The instrument has five different MD circuits, selectable through the menu, which are representative circuits designed to simulate the impedance of the human body under different conditions. The impedance of the human body will vary depending upon point of contact, the surface area of the contact and the path the current flows. - Page 19 multiple sensitivity levels. No load setup of trip current This provides the operator with an easy and safe and output voltage way to set trip currents and output voltages since parameters are set without the high voltage activated. TUV & UL listing This assures you that this instrument meets or exceeds safety requirements to ensure operator safety.
- Page 20 voltage even while High Withstand Voltage Tester is in the dwell mode so you can analyze test results at different voltages. Flashing high voltage A flashing LED located directly over the high indicator voltage terminal clearly indicates when high voltage is active to provide maximum operator safety.
-
Page 21: Getting Started
Note Please retain all of the original packaging materials. 2.1.2. Contents of the Carton Inside the carton should be the following: 747X SERIES INSTRUMENT 7470, 7472 7473，7474 PART DESCRIPTION PART NUMBER PART NUMBER... - Page 22 mass not exceeding 3 kg), or H05 VV-F or H05 VVH2-F2 (for equipment mass exceeding 3 kg), and be rated for at least 3G 0.75 mm2 (for rated current up to 10 A) or 3G 1.0mm2 (for rated current over 10 A up to 16 A) wire or larger, and the length of the cord does not exceed 2 m must be used.
-
Page 23: Installation
2.2. Installation 2.2.1. Work Area Locate a suitable testing area and be sure you have read all safety instructions for the operation of the instrument and suggestions on the test area set-up in the Safety section 1.4. Safety. Make sure the work area you choose has a three-prong grounded outlet. Be sure the outlet has been tested for proper wiring before connecting the instrument to it. - Page 24 2.2.4. Environmental Conditions This equipment is intended for indoor use only. The equipment has been evaluated according to Installation Category II and Pollution Degree 2 as specified in IEC 664. This instrument may be operated in environments with the following limits: Temperature…....
-
Page 25: Specifications And Controls
3. Specifications and Controls 3.1. Functional Specifications 3.1.1 7470 Functional Specifications Output Rating 10KVAC/20mA AC WITHSTAND VOLTAGE Range Resolution Accuracy ±(2% of setting + 10V） Output Voltage, ACV 0 - 10000 Output Frequency 50Hz/60Hz ±100ppm, User Selection Output Waveform Sine Wave ,THD.<2% (Resistive Load), Crest Factor = 1.3 - 1.5 Output Regulation ±... -
Page 26: 7472 Functional Specifications
3.1.2 7472 Functional Specifications Output Rating 12KVDC/10mA DC WITHSTAND VOLTAGE ±(2% of setting + 10V） Output Voltage, DCV 0 - 12000 <5%（12KV/9999µA at Resistive Load） Output Ripple SETTINGS ±(2% of setting + 2counts） Hi / Lo -Limit DC Current, µA 0.0 - 999.9/1000 - 9999 0.1/1 Ramp Up Time, second... -
Page 27: 7473 Functional Specifications
3.1.3 7473 Functional Specifications Output Rating 20KVAC/10mA AC WITHSTAND VOLTAGE Range Resolution Accuracy ±(2% of setting + 20V） Output Voltage, ACV 0 - 20000 Output Frequency 50Hz/60Hz ±100ppm, User Selection Output Waveform Sine Wave ,THD.<2% (Resistive Load), Crest Factor = 1.3 - 1.5 Output Regulation ±... -
Page 28: 7474 Functional Specifications
3.1.4 7474 Functional Specifications Output Rating 20KVDC/5mA DC WITHSTAND VOLTAGE ±(2% of setting + 20V） Output Voltage, DCV 0 - 20000 <5%（20KV/5000µA at Resistive Load） Output Ripple SETTINGS 0.0 - 999.9/1000 - Hi / Lo -Limit DC Current, µA 0.1/1 ±(2% of setting + 2counts) 5000 Ramp Up Time, second... -
Page 29: General Specifications
3.1.5 General Specifications MODEL 7470 7472 7473 7474 GENERAL Input Voltage AC 115/230VAC ± 15% , 50/60Hz ± 5% Fuse: 6.3A Slow Input : Test , Reset , Memory1.2.3 ,Interlock PLC Remote Control Output : Pass , Fail , Processing Safety Smart-GFI Function (<1mA) -
Page 30: Instrument Controls
3.2 Instrument Controls 3.2.1 Front Panel Controls 4 5 6 1. POWER SWITCH: Rocker style power switch with international ON ( ) and OFF (0) markings. 2. RESET BUTTON: Momentary contact switch used to reset the instrument. If a failure condition occurs during a test, you will need to reset the system to shut off the alarm and signal the system that you are aware of a failure condition. - Page 31 4 5 6 11. ENTER: Use this key as an ENTER key to accept numeric data for parameter settings. 12. HIGH VOLTAGE OUTPUT JACK: Connector used to attach the High Voltage test lead or test fixture high voltage lead to the instrument. The connector is recessed for safety when not being used.
- Page 32 3.2.2 Rear Panel Controls 1. CHASSIS GROUND (EARTH) TERMINAL: This terminal should be connected to a good earth ground before operation. 2. CALIBRATION BUTTON: To put the instrument into the calibration mode, push this button and turn on the power switch simultaneously. 3.
-
Page 33: Quickstart
3.3 Quickstart This quick start guide assumes the operator has some familiarity with automated Electrical Safety testing. Locate a suitable testing area and be sure you have read all safety instructions for the operation of the instrument and suggestions on the test area set-up in the Safety section. - Page 34 carry the voltage and current of this tester but they are not intended to be held by the operator during the test while the high voltage is energized. Please insure that you do not make contact with the alligator clip or the clip insulator while high voltage is energized.
- Page 35 pressing the ENTER key and then scrolling with the up and down arrow keys or repeatedly pressing the ENTER key. The results of the last test in the process will be followed by the first test when scrolling through the results. All buffers are cleared at the start of the next test cycle. Pressing the EXIT key will return you to the Settings screen.
-
Page 36: System Settings
4. System Settings 4.1. SETUP Key Parameters At the Setting, Pass, or Fail screen press the SETUP key. 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, Fail Stop, Contrast, Alarm, Smart GFI, GPIB address, BUS Remote Command Set, Memory Lock. - Page 37 If the Fail stop is off and a failure occurs during the test sequence, the RESET button will light and a short alarm will sound but the sequence will continue to the end. At the end of the test sequence, the RESET button will light and alarm will sound indicating failure during the sequence.
- Page 38 Use the Numeric keys to enter the Audible Alarm level, then press the ENTER key. The program will provide a sample sound for checking immediately when the ENTER key is pressed. Change the Volume again or press the SETUP key to forward to the Smart GFI selection.
- Page 39 Press the SETUP key to advance the menu to the GPIB address parameter. The display will show: GPIB addr Range: 0-31 Use the Numeric keys to enter the GPIB Address, then press the ENTER key. Change the GPIB address again or press the SETUP key to advance to the Memory Lock parameter.
-
Page 40: Lock/Local Key
4.2. LOCK/LOCAL Key 4.2.1. Lock Function Press the LOCK/LOCAL key. If the Password is enabled, the display will show: Password = _ _ _ _ Range : 0 - 9 9 9 9 Use the Numeric Key to enter the password and then press the ENTER key. The program will switch the Key Lock function from LOCK to UNLOCK or UNLOCK to LOCK mode and advance the program to Operation mode automatically. - Page 41 keyboard lock out will be selected by the LOCK key on the front panel without a Password. The Password default is preset to 0 at the factory.
-
Page 42: Test Parameters Setup Procedures
5. Test Parameters Setup Procedures 5.1. Test Parameters Description of Test Parameters Voltage: The Voltage that is applied to the High Voltage and Return terminals or the Current and Return terminals during a test. HI-Limit: A maximum current or resistance threshold that when exceeded triggers a failure. -
Page 43: Setting Up Tests
5.2. Setting Up Tests Before going to setup the Test Parameters, make sure that the Keyboard is in the Unlock mode, and then follow this procedure to setup the Test Parameters. Press the Memory key and using the numeric keypad enter the Memory number you would like to edit and then press the ENTER key. - Page 44 Press the EXIT key to exit from the setting mode to the operation mode if all parameters have been set. 5.2.3. LO-Limit Current setting Advance the menu to the LO-Limit parameter. The display will show: XXX.X A LO-Limit = LO-Limit X.XXX mA Range: 0.000 –...
- Page 45 Dwell Time = XXX.X s Dwell Time = XXX.X m Range : 0.3 - 999.9s 0 = Const. Range : 0.4 - 999.9m 0 =Const. Use the Numeric keys to enter the Dwell Time setting, and then press the ENTER key. The program will store the Dwell Time setting and advance to the Ramp -DOWN time setting automatically.
- Page 46 Range : 1 - 9 9 = High For model 7470, 7472 and 7473, the range of ARC sense is from 1 to 9. For model 7473, if the voltage is lower than 15KV, the range of Arc sense is from 1 to 9.If the voltage is higher than 15KV, the range is from 1 to 7.
- Page 47 Withstand Voltage test when the Output is activated. If the charging current was lower then the setting, the test cables may not be connected properly. This instrument can set the Charge-LO value manually or automatically. To set the Charge-LO value manually, use the numeric keys to enter the Charge-LO current setting and then press the ENTER key.
-
Page 48: Reviewing Test Results
The following table is a listing of the Default Parameters for the ACW tests available in the 7470 and 7473 High Withstand Voltage Tester and the DCW tests available in the 7472 and 7474 High Withstand Voltage Tester When you receive your High Withstand Voltage Tester all 50 memory locations will be loaded with these parameters. -
Page 49: Operating Instructions
6. Operating Instructions 6.1. Preparation and Instrument Connections 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, the Alarm Volume, and Fail Stop. Be sure to connect the appropriate test leads to the device under test (DUT) or test fixture. -
Page 50: Metering
The following table describes what meters will be displayed. Model Test Type Current Voltag Time 7470, 7473 AC Withstand 7472, 7474 DC Withstand The memory location will also be indicated on the display as well as the connect function 6.5. - Page 51 DO NOT TOUCH THE DEVICE UNDER TEST, HIGH VOLTAGE TEST LEAD, ALLIGATOR CLIP, OR CLIP INSULATOR ONCE THE TEST HAS BEEN STARTED. 3. Press the TEST button. 4. The instrument will now perform the test or connected sequence of tests. 6.5.2.
- Page 52 instrument will log the RESET but will not discontinue the discharge function. Pressing the RESET during the discharge will only prevent a connected memory from executing after the discharge time. The capacitance of the DUT should never exceed the maximum specification listed in this manual.
-
Page 53: Displayed Messages
7. Displayed Messages 7.1. Running Test Messages all units If the test in process is Aborted with the RESET button or remote control, the display will show: MXX Abort XXX.X s XX.XX KV XX.XX mA If the test in process is Aborted with the RESET button or remote control before the meter readings are taken, the display will show: MXX Abort XXX.X s... - Page 54 MXX HI-Limit XXX.X s 10 mA XX.XX KV If the DUT current is well beyond the metering range of AC Withstand Voltage test the instrument assumes that the failure is due to a short circuit, the display will show: MXX Short XXX.X s ...
-
Page 55: Additional Displayed Messages For Dc Units
7.2. Additional Displayed messages for DC units If the Ramp-HI function is enabled and the leakage current during the Ramp cycle exceeds 5mA, then the display will show: MXX Ramp-HI XXX.X s >5000 A XX.XX KV If the leakage current during the Ramp cycle falls below the Charge -LO setting, then the display will show: MXX Charge-LO XXX.X s... -
Page 56: Fatal Error
7.4. Fatal Error The only active button or key in this situation is the RESET button. The only reason the RESET button is active is to allow you to silence the alarm and open the fail relay. This type of failure permanently locks the instrument in the “Fatal Error” mode and requires that the instrument be serviced by Extech. -
Page 57: Connection Of Remote I/O
8. Connection of Remote I/O Two 9-pin “D” type connectors are mounted on the rear panel that provide REMOTE-INPUT-OUTPUT control and information. These connectors mate with standard 9 pin D-sub-miniature connector provided by the user. The output mates to a male (plug) connector while the input mates to a female (receptacle) connector. For best performance, a shielded cable should be used. -
Page 58: Signal Inputs Of Remote I/O And Memory Access
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. - Page 59 MEMORY ONE – Momentarily connecting terminal 7 to 8 signals the instrument to immediately begin the test program that is stored in memory one. MEMORY TWO – Momentarily connecting terminal 7 to 9 signals the instrument to immediately begin the test program that is stored in memory two. MEMORY THREE –...
-
Page 60: Bus Remote Interface Gpib / Rs-232 (Option)
9. Bus Remote Interface GPIB / RS-232 (Option) This section provides information on the proper use and configuration of bus remote interface. The RS-232 interface also uses the same command set as the GPIB interface for setting of test parameters. However, many functions of the GPIB 488.2 interface are not available through RS-232. -
Page 61: Gpib Connector
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. IFC (interface clear) IFC is driven by the system controller to initialize the bus and become CIC. -
Page 62: Interface Functions
9.6. Interface Functions The capability of a device connected to the bus is specified by its interface functions. These functions provide the means for a device to receive, process, and send messages over the bus. The interface functions are listed in the chart below. GPIB 488.1 INTERFACE FUNCTIONS Interface Function Subset... -
Page 63: Gpib / Rs-232 Interface Command List
DTR (pin 4), DSR (pin 6) CTS (pin 8) and RTS (pin 7). If the port cannot be configured through software to ignore the lines then the handshake lines should be jumpered together in two different sets. Pins 4 and 6 jumpered together and pins 7 and 8 jumpered together at the controller end of the cable. - Page 64 TEST Starts the test sequence at the selected memory location that has been loaded into the instruments memory (RAM). RESET Stop or abort a test. Also used to reset a latched failure condition. SACG Set the Charge-LO parameter for the DCW test. The cables and any test fixture should be connected before executing the command.
- Page 65 ECC? ECG < value > Edit Charge-Lo 0.0 - 350.0uA ECG? EDW < value > Edit Dwell 0, 0.3 - 999.9s (7470, 7473) EDW? 0, 0.4 - 999.9s (7472,7474) 0, 0.1 - 999.9m EF {1|0} Edit Frequency 1=60Hz, 0=50Hz 0.000 – 9.999mA (7473, EH <...
- Page 66 Command Name Test Value Types ERD <value > Edit Ramp-DOWN 0.0 - 999.9s (7470, 7473) ERD? 0, 1.0 - 999.9s (7472, 7474) ERH {1|0} Edit Ramp-HI 1= On, 0=Off ERH? ERU < value> Edit Ramp-UP 0.1 - 999.9s (7470) ERU? 0.3 - 999.9s (7473)
- Page 67 Command Name Value SFF? 9.8.5. Query Commands These query commands will retrieve data from the instrument. The GPIB bus application requires an IEEE-488 read command to be sent after the query command. These commands include functions for retrieving test data, test results and remote hardware status as well as setup file information.
- Page 68 Read the remote Interlock input signal. When the remote Interlock has be activated by opening the contacts the query will return a value of 0 to indicate the instrument is in the Interlock state and will not be able to generate output voltage or current. Lists all the Parameters for the individual memory that is currently selected.
- Page 69 Command Name Description Query *STB? Read Status Byte Query Read Status Byte *SRE Service Request Enable Command value = 0 - 255 <value> *SRE? Service Request Enable Query 0 - 255 *IDN? Read the instrument identification string. Company =Extech Electronics Ltd., CO. *RST Reset the instrument to original power on configuration.
- Page 70 binary-weighted sum of bits. *ESE <value> Standard Event enable register controls which bits will be logically OR’d together to generate the Event Summary bit 5 (ESB) within the Status Byte. *ESE? Queries the Standard Event enable register. Returns the decimal value of the binary-weighted sum of bits.
-
Page 71: Example Of Communicating Over The Gpib Bus
Standard Event Register Status Byte Register Bit Binar Event Register Enable Summary Register Enable Registe Registe weigh Operation Complete ALL PASS not used FAIL Query Error ABORT Device Error TEST IN PROCESS Execution Error Message Available (MAV) Command Error Event Summary Bit (ESB) not used Request Service (RQS) or Master Summary Status... -
Page 72: Non Volatile Memory
If you wish to set the Ramp-UP time of the test across the IEEE bus at 10 seconds, do the following, send the string "ERU 10.00". This tells the instrument to set the Ramp-UP time at 10.00 seconds. To read the live testing data, first send the string "TD?" then send the GPIB command to read. -
Page 73: Options
10. Options GPIB Interface This option may be substituted for the RS232 interface. This option provides all of the function control of the RS232 interface with the addition of SRQ functions. All commands can be found in section 9. Bus Remote Interface GPIB/RS-232 of this manual. - Page 74 The printer output will generate the 40 character LCD display test results when the test is complete. This selection will determine when the 40-character output will print. When Print Mode = All the printer output will print the test results from every test performed.
- Page 75 M 1 Pass 1.0s 5.00KV 0.000mA NO. 1003 M 1 Pass 1.0s 5.00KV 0.000mA Sample printer output of the same test results, but the Print Mode = Fail. In this case the test number of every test is printed but fail result details are printed only when a failure occurs.
-
Page 76: Calibration Procedure
7473, 10 mA AC Ammeter. 7472, 10mA DC Ammeter. 7474, 5mA DC Ammeter. 7470, 7472, 100K, 20-watt resistor, 1000 volt. 7472, 7473, 100K, 10-watt resistor, 1000 volt. 7474, 100K, 2.5-watt resistor, 1000 volt. 7472,7474 1M, 0.25-watt resistor, 300 volt 11.2. - Page 77 C a l i b r a t C a l i b r a t Connect an AC standard voltage meter for 7470 and 7473 or a DC standard voltage meter for 7472 and 7474 which can measure up to 10KV to the output connectors and...
- Page 78 AC Hipot, 3.500mA current range Press the key, the program will advance to the AC 3.500mA range calibration of the hipot test. The display will show: AC 3.500mA, 100K T E S T C a l i b r a t Connect a resistor about 100K/40W in series with a AC standard Ammeter which can measure up to 3.500mA to the output leads.
- Page 79 AC 10mA, 100K T E S T C a l i b r a t AC Hipot, 3.500mA current range Press the key, the program will advance to the AC 3.500mA range calibration of the hipot test. The display will show: AC 3.500mA, 100K...
- Page 80 Use the Numeric keys to enter the standard value of current, unit mA, and then press the ENTER key to store the standard value of DC 10.00mA range for calibration and the display will show: DC 10.00mA, 100K T E S T C a l i b r a t e DC Hipot, 3500A current range Press the ...
- Page 81 Use the Numeric keys to enter the standard value of current, unit A, and then press the ENTER key to store the standard value of DC 350A range of the hipot test and the display will show: DC 350A, 1M T E S T...
- Page 82 Use the Numeric keys to enter the standard value of current, unit A, and then press the ENTER key to store the standard value of DC 3500A range of hipot test and the display will show: DC 3500A, 100K T E S T C a l i b r a t e DC Hipot, 350A current range Press the ...
Need help?
Do you have a question about the 7470 and is the answer not in the manual?
Questions and answers