Assembly & User Manual
Contents
1. v 19 R15 6 sef OF C Finished pcb assembly Battery connector When all the components are on the board solder the battery snap connector to the battery pads on the PC board red to and black to 7 Final Assembly The pc board sits snugly in the bottom enclosure Fasten the board into place using the five self tapping screws Remove the battery compartment door from the bottom of the enclosure and feed the battery leads through the opening and as shown in the picture Initial checks Connect a 9 volt battery to the battery connector and press the button switch once One or two of the red LEDs should be flickering that is the power on signal If the leads are wrapped around each other more LED s will flicker Press the button again to turn it off Test inductor Wrap the enameled wire supplied into the center holes of the ferrite core supplied in the bag labeled Test over and over tightly to form a test coil as shown in the picture Strip the enamel insulation off the ends of the wires for good contact to the copper wire Heating the enamel over an open flame will make it easier to strip by scraping Connect the ring tester clips to the two wires of your test inductor All LEDs should be on solidly Test inductor You are done That s it Install the enclosure top and secure it with the four self tapping screws Push the battery into its compartment2. VG Ring Tester Assembly amp User Manual AnaTek Corporation 100 Merrimack Road P O Box 1200 Amherst NH 03031 USA 603 321 0884 FAX 603 836 4436 ringtestquestion anatekcorp com This ring tester is an inexpensive and effective way to test any high Q inductive component It is especially useful for doing a quick check on flyback line output transformers and other high frequency wound components like deflection yoke windings and SMPS transformers The LEDs on the left side show the Q of the device being tested more lights higher Q 1 e no lights short circuit red Bad or low Q yellow 22 or medium Q green Good high Q This document was written by Bob Parker and edited by John Bachman at AnaTek Corporation Some graphics and text courtesy of Silicon Chip March April issue 2004 D2 1N4148 1Oufi 16 1 00nf D3 1N4148 AGND Parts List Resistors all 5 1 4 Watt Capacitors all 16 Semiconductors Miscellaneous WV minimum 270 R15 1 nf ceramic C3 8 1N4148 D1 2 3 Pushbutton switch Red Blue Brown with cap 2 2 R7 10 16 17 18 100 nf ceramic 2N3904 Q1 2 3 Blue Hammond 21 22 25 4 5 67 9 enclosure Red Red Red 4 7KQ R8 19 20 10 uf electrolytic C2 CD4069 IC1 Label Orange Violet Red 10 R4 14 CD4015 1 2 Pair of test leads Brown Black Orange one red one black 22 R3 4 5 6 Red LED LED 1 2 Pair of alligator clips Red Red Orange 3 wit
3. and install the battery compartment door Then put the label on the front and start testing inductive components How does a ring tester work The components in many circuits including display drivers SMPS and tuning circuits contain low loss high Q resonant circuits The testing technique used in this design is based on the fact that many faults in magnetic components result in increased loss reduced Q Ring testing gets its name from the fact that a when fast voltage pulse is applied to a high Q circuit the tuned nature of the circuit will produce a decaying AC voltage of several cycles More cycles or rings means higher Few no cycles indicates a problem in that component a shorted winding or some other malady This tester provides a quick and easy way to track down such problems Consider this set of waveforms from a flyback transformer LOPT Tek GOLS anpe 0 Acs 00 00 voc 10085 EEE 5 10045 Ringing waveforms for FBT LOPT A is good Bottom is a shorted winding Waveform A shows the ring response to this tester s pulse for good FBT LOPT Note several rings in a decaying fashion This tester will count the rings that exceed its threshold and display them as lit LEDs as shown in the simulation to the right of waveform A Waveform B is the response from the same FBT LOPT with a shorted diode The tester will show only one or two ted LEDs lit sol
4. beled test contains an inductor that will use after your unit is assembled The inductor is not installed 2 y on the pc board Installing components The construction sequence basically installs the smallest components first The table of color codes above will help you select the resistor values prior to checking It is a good idea to check the value of all of the resistors with an ohm meter as manufacturers occasionally make labeling mistakes Take care with the orientation of the polarized components the electrolytic capacitor diodes LEDs and transistors OPTION Some kit builders are nervous about soldering directly to the integrated circuit pins and prefer to install sockets for that reason Feel free to do so although sockets are not included in the kit If you solder your integrated circuits and manage to damage them in doing so contact AnaTek We will replace the integrated circuits for FREE 5 Lede OG LEDS Yel Yel Gr 04 LED JOO LEDS ene 817 i RedRedRedYel Yel GrnGrn6rn D R16 Semiconductors not LEDs installed Grn GOGE 4 LEDS ega 9 a 2 LED shim use See picture above for use of the plastic shim for aligning the LEDs Put red LED1 in place and green it looks clear LED8 into place and slide the shim under them Then put the other LEDs into place and press all of them agains
5. h insulators 1 R1 2 5 6 11 12 Yellow LED LED 3 tie wrap Brown Black Green 4 5 Green LED LED 6 2 grommets printed circuit board ferrite core and wire Diodes 2143904 Construction As you can see in the photos all the components are mounted on a single PC board which is then attached to the enclosure bottom Even though the pc board 15 high quality with solder mask it 18 still wise to check it for defects do this illuminate the component side with a bright light and examine the copper side very carefully preferably with a magnifier for any hairline fractures in the tracks During assembly frequently check for any solder whiskers or bridges and pay particular attention to any tracks which pass between IC pads where such defects tend to congregate and hide It is good practice to install 5 or 6 components and then check the soldering of them under a magnifier Then move on and install 5 or 6 more The PC board is tightly packed and the solder pads are quite small so be very careful with your soldering Always lift the iron vertically from a just soldered joint and never wipe it sideways as so many constructors seem to do Component Installation Sequence The kit package contains five plastic bags of components Install them in the following order 5 resistors Capacitors Semiconductors See detailed description of LED installation Miscellaneous parts The bag la
6. idly as opposed to the blinking power on indication as show in the simulation to the right of waveform B A short anywhere in the circuit such as the HOT will show no rings at all Different 5 will exhibit a different ring response Some will light all of the LEDs as shown above and others will perfectly good will light only five or six LEDs It 15 wise to check a known good component for comparison before deciding good bad High voltage failures that occur only with power may not be detected by this low voltage ring tester Because this unit uses pulses of 600 millivolts or less it will not detect those failures However the low voltage permits many in circuit tests so making a happy compromise While much of our discussion is directed at FBT LOPT devices the ring tester is not limited to them It will give a rough but useful indication of good no good for many types of Hi Q low loss inductive components
7. t the shim Bend the leads to hold them into place and solder Then slide the shim out This makes the LEDs the same height Adjust to line them up in a line Short leads go to the outside of the pcb See the note on the non component side of the board indicating the short lead position Test lead installation Strip approximately 1 8 2 mm from one end of the test leads and tin using rosin core solder Install the grommets into the enclosure end panel as shown in the picture Then push the test leads through the grommets The outside of the panel is the finished side Yes the leads fit tightly in the grommets they are supposed to Then solder the test leads to the pc board and secure them with the tie wrap Leave enough slack for the leads to clear around the pc board holes for the enclosure bosses Strip approximately 1 4 4 mm from the other end of the test leads do not tin them Push alligator clip insulators onto the leads first and then push the lead end into the center hole of the alligator clips as shown the picture R3 Erne 4015 J 755 R22 210 Then solder the lead to the clip trimming it so that the insulator can be slid over the clip Use rosin core solder to make the soldering easier aed 2 R413 969 204 ry RI as TE 818 0 1 o D gt a mn Z
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