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  1. R

    Lock in amplifier EG & G 5210

    Could changing the microprocessor possibly help? Does one need to program the microprocessor?
  2. R

    Lock in amplifier EG & G 5210

    I am not in a hurry. All I need is a working instrument in the end. Time is not a problem at all.
  3. R

    Lock in amplifier EG & G 5210

    I connected the boards. But even without them the buttons are responding. But there are errors. For example when I press DISP button of display 1 group, The unit highlighted still remains DEG and does not change to V. The display one however is able to track the reference frequency correctly...
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    Lock in amplifier EG & G 5210

    Strangely now the display and buttons are working but the instrument is behaving wierdly. Display 2 is frozen at +1888 and not responding to anything when AUTO MEASURE is pressed.
  5. R

    Lock in amplifier EG & G 5210

    15V on pin 8
  6. R

    Lock in amplifier EG & G 5210

    I am sorry for not replying as I could not come to the lab on Sunday. Yes I had incorrectly measured for pins 2 & 3. Now I correctly measured for pins 4 & 8 with metal case ground and I found them to be -17.4 V for pin 4 and 15V for pin 8.
  7. R

    Lock in amplifier EG & G 5210

    For Vcc and Metal case the voltages are all about 5V for ICs of the type 74HCxx or 74Cxx, or maybe 74LSxx though I have not checked for all of them yet. But the voltage across + and metal case and - and metal case for the LM 311N Ic is only about 3.7 V. thanks
  8. R

    Lock in amplifier EG & G 5210

    The lid has a number 21593E The transformer is sitting tightly There is paper with calibration numbers I checked the voltages across 7818 and 7918 and they are as you mentioned. Across the resistors the voltage is around 2.8V
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    Lock in amplifier EG & G 5210

    The main supply line has been set at 220 V and there is no smell from the transformer. I can use a multi meter confidently but I do not have a clamp on ammeter. I am now looking for the IC s you mentioned and should the top board in the aluminium box be removed when I measure the voltages on...
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    Lock in amplifier EG & G 5210

    I had taken the photo after removing the boards. I have now attached photos with nothing removed.
  11. R

    Lock in amplifier EG & G 5210

    I am attaching a few photos of the PCB. I am a physics guy with minimum knowledge of electronics. Please bear with me.
  12. R

    Lock in amplifier EG & G 5210

    I got the instrument on 10 th July. It looked like it was working well though I did not do any experiment with it. I could carry out the initial procedure (mentioned in the instruction manual). I thought because of high reference input voltage the device got spoiled. Or may be there is a...
  13. R

    Lock in amplifier EG & G 5210

    I have a lock in amplifier EG & G Princeton applied research 5210. I directly connected a signal generator ( rms 9V) to the reference input of the lock in amplifier. Later I saw that the maximum voltage of the signal allowed to the reference input is rms 5V. The lock in amplifier is not...
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