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  1. gruder

    Response Signal Test Proceedure

    Thanks for the replies although to be honest i am not sure we are on the right track? Basically a pulse induction metal detector works by inducing a metal target with a magnetic pulse & then reads the eddy current return signal from the targets which is then amplified & makes the detector go...
  2. gruder

    Response Signal Test Proceedure

    Yes, the signals are large enough to see, especially with an Air test setup. The signals i am getting at the moment are around 10mV Amplitude from a small 1grm Gold Nugget. The problem i seem to have is that metals with different conductivity seem to have the same Amplitude & Decay times as...
  3. gruder

    Response Signal Test Proceedure

    No, i get no signal when connecting the ground wire to the probe, i tested that first up to make sure. As mentioned i am trying to test the Amplitude & Decay also signal duration of metal targets once induced, the metal targets are induced by the magnetic pulse of the detector & create Eddy...
  4. gruder

    Response Signal Test Proceedure

    I am trying to test the target response signal from various metal objects using a pulse induction metal detector to induce the targets. I have been using a O-scope probe connected across various ferrous & non ferrous samples with the metal detector a set height to try to read the response...
  5. gruder

    Efficiency of Heating Air vs Cooling

    If i have this correct, it takes 1BTU of heat to raise the temp of 1lb of water by 1 deg. Is it the same for cooling, is the efficiency still the same, 1BTU to lower the Temp by 1 deg? I am specifically looking for the equation for how many BTU's of heat required to heat 1 cubic meter of Air by...
  6. gruder

    Lead Acid Batteries

    Thanks Guys, I will take note of what has been suggested.
  7. gruder

    Lead Acid Batteries

    Is there a way to protect lead acid batteries from harsh winter conditions, we always have battery failures after winter due to the freezing conditions & it is becoming quite expensive. Is there an additive or something to help this situation?
  8. gruder

    Isuzu 4HG1 Diesel

    Hi All, Recently there has been a several Isuzu 4HG1 Diesel Engines come through our workshop with overheating issues that has become somewhat confusing to rectify. Any suggestions would be welcome. The engines all have the same characteristic that is when under full throttle load the Temp...
  9. gruder

    Hydraulic circuit.

    I need some advice on the correct circuit design for a hydraulic cutter--shear i am building. All this will seem very basic to those who are familliar to hydraulic circuits but i am a bit green when it comes to this & want to make sure the circuit is correct. Basically i have a resevoir with a...
  10. gruder

    Manifold port size and peak torque rpm - air velocity limit: NA vs. FI

    edjza80 An interesting question: Also hard to answer due to all the misconceptions about intake velocities regarding N/A engines. We can calculate & manipulate all the figures we want regarding airflow velocity but in "reality" it is what the engine "actually" sees in the way of flow that...
  11. gruder

    Power and torque curve dips

    Guys, Don't over look the basic things first like A/F ratio's or advance curves, very often you can chase your tale with all the technical mumbo jumbo & get nowhere. Go back to basics first, we have come across many engines with similar problems only to find the A/F ratio is not right for the...
  12. gruder

    Mass Centroid Axis Revisited

    I am new to this Forum & have been reading a thread called "How to locate the mass centroid axis" which i found was a closed thread so i had to start again. warpspeed: The answer to your question is quite simple as the mass axis is drawn through the front & rear CG heights & a few simple tests...

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