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Need to know exact frequencies
When on channel one,hook up an oscilloscope to the channel output circuit on the output terminals.First read channel 1,then channel 2,then channel 3.You can leave the oscilloscope hooked up the whole time.Start on the highest available scale,then work your way down scale by scale until it is accurately readable.Then you will need to find the input to the counting circuit,most likely from a thermistor.You will need to reconfigure the counting circuit to send a signal from what the thermistor is reading for the temperature to 600Hz instead of what the current counting circuit is set at.You can achieve that by connecting the oscilloscope to the output side of the IC for the counting circuit with one lead on the output,one lead on the input,and determine what it is set at currently,then redesign it to pulse at 600Hz input which is 10 second intervals.Greg
on Oct 30, 2010
Is there any way to change the battery on a Trumeter 5505E measuring whee
5505E MEASUREMETER BATTERY CHANGE (3V CR-2032)
REMOVE WHEEL AND SHAFT BY GENTLY PULLING AXLE OUT OF UNIT.
DRILL OUT 7 PLASTIC HEADS WITH 3/16 DRILL BIT. (ABOUT 1\8 DEPTH)
SPLIT TWO SIDES OF CASE AND REMOVE HANDLE.
SLIDE OUT CLEAR PLASTIC CONTROL UNIT. PUSH DOWN ON BUTTONS AS YOU REMOVE SO AS NOT TO DAMAGE THEM.
PUSH DOWN SLIGHTLY TOWARD THE CASE ON LOCK TABS WHILE GENTLY PULLING CASE APART. START ON ONE END AND WORK YOUR WAY TO OTHER END. KEEP GASKET INTACT. OPEN CASE.
THERE IS A "Y" SHAPED RETAINER HOLDING IN THE BATTERY. WITH NEEDLE NOSE PLIERS, CAREFULLY SLIGHTLY SQUEEZE THE BOTTOM OF THE "Y" AND PULL UP GENTLY. YOU CAN NOW REMOVE THE BATTERY AND INSTALL THE NEW ONE. PUSH RETAINER DOWN TO LOCK BACK IN.
MAKE SURE GASKET IS IN PLACE AND PUT CASE BACK TOGETHER, MAKING SURE WHEEL ADAPTER IS IN PROPER PLACE. TURN ON AND TEST CONTROL UNIT AND TURN WHEEL ADAPTER TO MAKE SURE UNIT IS WORKING PROPERLY.
SLIDE CONTROL UNIT BACK IN BEING CAREFUL OF THE BUTTONS. RE-ASSEMBLE HANDLE AND PUT THE TWO SIDES OF THE CASE TOGETHER. I USED THREE PIECES OF ELECTRICAL TAPE TO HOLD CASE TOGETHER. ONE ON THE TOP BETWEEN THE TWO HOLES, ONE ON THE BOTTOM JUST ABOVE THE DISPLAY, AND ONE IN THE MIDDLE.
PUT THE PLASTIC PIECE IN THE HOLE AND LINE UP. MAKE SURE BOTH O-RINGS ARE ON THE AXLE SHAFT. GENTLY INSERT AXLE ALL THE WAY IN WHILE ROTATING IF NECESSARY.
I WAS SO HAPPY I HAD IT ALL BACK TOGETHER AND WORKING, I HADN'T TAKEN ANY PICTURES AND I DIDN'T FEEL LIKE TAKING IT ALL APART AGAIN. MIGHT ADD PICTURES LATER IF NEEDED. I HAD BEEN LOOKING FOR YEARS ON HOW TO CHANGE THE BATTERY, AND I FINALLY MADE UP MY MIND THAT I WAS GOING TO DO IT.
17 hours ago
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