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Æ20218

Milliohm Meter

Assembly and

Operation Manual

REV 3.0 DE

Summary of Contents for AE20218

Page 1: ...20218 Milliohm Meter Assembly and Operation Manual REV 3 0 DE 2018 Ascel Electronic...

Page 2: ...18 Milliohm Meter 1 Circuit Description 2 Four Wire Kelvin Measurement 3 Soldering 5 Component Reference 7 Assembly 15 Adjustment 18 Troubleshooting Checklist 20 Power Supply 22 Case Mounting 23 Opera...

Page 3: ...ning the case Work on devices only if you made sure that they are disconnected from any power supply and any possible charge inside is discharged Devices must only be used if they are mounted in a cas...

Page 4: ...hops the use of this unit must take place under the supervision of qualified staff Do not put this unit in use in an environment where the risk of fire or explosion or explosive gas vapor or dust is p...

Page 5: ...g with the appropriate regulations for electronic devices All accompanying papers in particular this manual must also be passed over Where necessary for example in the European Union you must also pub...

Page 6: ...ng from a fabric seat removing some types of plastic packaging or using non ESD compliant tools Danger of ESD The high voltage pulse can easily destroy electronic parts ICs and FETs are very sensitive...

Page 7: ...results The optional USB interface allows remote control of the device with the included software The easy plain text command protocol allows simple integration with external tools and systems Every...

Page 8: ...source is based on the LT3092 IC5 Precision Source to increase its accuracy the LT1634 IC6 Precision Voltage Source is used as the reference With the 0 1 tolerance resistors and multi turn trimmers to...

Page 9: ...he total resistance the meter can see consists of the Device Under Test DUT the test leads and the contact resistance Since the latter can be in the ballpark or even larger than the DUT it makes accur...

Page 10: ...s negligible as it is many orders of magnitude smaller than the actual value The resistance of the test clips can be ignored in the voltage measurement assuming a typical value of 1Ohm it is irrelevan...

Page 11: ...rotective glasses If you use additional flux make sure it is suitable for electronics use Non suitable flux may contain acid which will damage the traces on the PCB over time Try to solder fast Heatin...

Page 12: ...leg 3 Wait a moment Do not move the part you just soldered for a few seconds while it is cooling down Moving it may cause the solder joint to crack 4 Then remove the iron With lead solder the solder...

Page 13: ...e the solder joint The resistance value is given with colored bands on the resistor The code consists of four five or six bands With four bands the first two are the base value see table below the thi...

Page 14: ...itors Capacitors are soldered the same way as resistors Electrolytic capacitors are polar They must be mounted in the correct orientation They will be destroyed when installed in reverse polarity and...

Page 15: ...the letter n is the capacitance in nF where 3n9 is 3 9nF Upper case characters denote the tolerance according to this table B C D F G H 0 1pF 0 25pF 0 5pF 1 2 2 5 J K M S Z P 5 10 20 50 20 80 20 0 10...

Page 16: ...symbol The positive terminal is called the anode Diodes are mounted horizontal Try not to heat up the body of the diode while soldering 4 LEDs LEDs light emitting diodes must be soldered with respect...

Page 17: ...atch the notch on top of the IC Do not use the firmware version sticker on the MPU to determine the orientation Only the notch is relevant Pin numbers are counted counter clockwise starting from the n...

Page 18: ...n the silkscreen drawing The leads may not cross Note field effect transistors FETs are extremely sensitive to ESD 7 Crystal The polarity of the crystal is not relevant but the bottom side of the pack...

Page 19: ...le below the third is the multiplier to the base value and the fourth is the tolerance The inductor value is base value multiplier tolerance Color Codes Color Digit Multiplier Tolerance in None 20 Sil...

Page 20: ...g soldering otherwise Press the Binding Posts through the holes in the PCB and solder them using more solder than the other parts Use a large soldering iron tip and plenty of solder for the Binding Po...

Page 21: ...itor labeling such as n10 0 10 nF 100 pF as opposed to 10 nF Also check if all leads of an IC are correctly inserted into the socket They tend to bend during insertion After soldering inspect the boar...

Page 22: ...to fix errors which takes extra time and effort See the previous page for more information 2 Solder the parts with an asterisk the LCD the Potentiometers the USB connector the 4mm binding posts and th...

Page 23: ...Finished Component Side Finished Solder Side without the LCD LCD Mounting 17...

Page 24: ...e Alternatively the adjustment can be done using a Resistance Standard Its value should be between 10 and 20 Ohm high accuracy low temperature coefficient It s strongly recommended to use only Four Wi...

Page 25: ...Standard Connect the test clips to the Resistance Standard and set the AE20218 to the 24 Ohm range Wait 30s and use a small screwdriver to set P1 so that the measured value matches the value of the S...

Page 26: ...match the bar on the silkscreen symbol Verify the polarity of the electrolytic capacitors Keep in mind that the marking on the capacitor can point to the or lead The actual meaning is printed inside...

Page 27: ...ld the PCB toward bright light Are there bad cold dry solder joints Jiggle component leads at the solder joint with a pair of tweezers Re solder them if any move If a solder joint looks suspicious bet...

Page 28: ...ria can be used Warning An AC power supply may not be used Note It is advisable to use a current limiting lab power supply when switching on for the first time Set it to 9V and 300mA this will help to...

Page 29: ...all necessary cutouts and labels 1 Put the extension caps on the tact switches 2 Join the front panel and the PCB and insert both in the respective brackets The PCB fits in the brackets behind the fro...

Page 30: ...in circuit if all capacitors are discharged Make sure the Device Under Test can handle the test current which is 100mA in the 24 Ohm range and 10mA in the 240 Ohm range The dissipated power should no...

Page 31: ...ads Connection Connect the test leads according to the diagram The use of the optional Four Wire Test Clips is recommended Connect the red plugs to the red sockets and the black plugs to the black soc...

Page 32: ...sh briefly REL indicator shown if the REL Mode is active current range 24 Ohm or 240 Ohm test current 100 mA or 10 mA Range Selection Press the RANGE key to change the current range Each press will ch...

Page 33: ...the device returns to normal operation The REL Mode will also be deactivated if the range is changed Changing the Decimal Format The number format decimal point and thousands separator can be selecte...

Page 34: ...Circuit Diagram Part 1 2 28...

Page 35: ...Part 2 2 29...

Page 36: ...lytic 2 C2 C6 22pF 1 C4 220 F Electrolytic 1 D1 1N4007 Diode 5 D2 D3 D4 D5 D6 1N4148 Diode 1 P1 Multi turn Trimmer 100 1 P2 Multi turn Trimmer 1K 1 R9 10 1 R10 100K 1 R1 10K 1 R6 220 1 R7 910 1 R5 15...

Page 37: ...ference 1 IC7 LT1460 Reference 1 Q1 14 4756MHz Crystal 1 K1 Relay 2 I_OUT_ V_IN_ 4mm Binding Post red 2 I_OUT_ V_IN_ 4mm Binding Post black 1 PWR Power Connector 2 S1 S2 Tact Switch 1 LCD 2x16 Dot Mat...

Page 38: ...CD mounting Four Wire Test Clips optional Case and 2 extension caps for the tact switches optional AC adapter optional Note Parts whose designator contains an asterisk are mounted on the opposite side...

Page 39: ...se designator contains an asterisk are mounted on the opposite side of the PCB See the chapter Assembly for details Note To help locate the right elements parts and their respective designators are hi...

Page 40: ...s a virtual serial COM port This makes integration with external tools and applications very easy System Requirements USB Interface MS Windows 1 98 ME 2000 XP Vista 7 8 Server 2003 Server 2008 Server...

Page 41: ...by going to Control Panel Device Manager and selecting the port Select Properties Port Settings Advanced and assign a new number It will remain even after the device is disconnected and connected agai...

Page 42: ...C allows to change the range and activate the REL Mode D allows logging all measurements and saving them as a csv file The readings can be shown as a graph E The graph can be saved to a file or print...

Page 43: ...0 mA Display 240 000 Counts Test Voltage 5V Measuring Technique Four Wire Sensing Functions Relative Mode Measuring Rate 1 Second Display 2x16 dot matrix LCD PC Interface USB optional Supply Voltage 8...

Page 44: ...TA A Resistance in 0 1 Ohm B Range 0 24 Ohm 1 240 Ohm C REL Enabled 0 FALSE 1 TRUE D REL Disable E REL Enable Y Decimal Point 0 1 234 5 1 1 234 5 1 Reserved 2 Hardware Rev 3 Firmware Rev 4 Product ID...

Page 45: ...Notes...

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Page 48: ...ASCEL ELECTRONIC www ascel electronic de 2018...

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