Recently, I got a low noise amplifier (i.e., ZFL-1000LN+ from MiniCircuits, with two wires already soldered in the turrent terminal pins. Today I have been trying to use it, but unfortunately it did not work. I connected the wire soldered in the GND pin to the GND point in my power supply and the other to the possitive connection. I was wondering if is it that the correct way or not.

Thanks in advance.

  • \$\begingroup\$ Does your power supply have +V, 0V and a separate ground? If so, you also need to connect 0V to Ground on the power supply. \$\endgroup\$ – Brian Drummond Feb 5 '16 at 14:09
  • \$\begingroup\$ Are you familiar with impedance matching? \$\endgroup\$ – Mast Feb 5 '16 at 14:09
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    \$\begingroup\$ "unfortunately it did not work" - what precisely does that mean. If you went to the doctor and said ONLY that you were ill, he'd show you the door to leave. \$\endgroup\$ – Andy aka Feb 5 '16 at 14:11
  • \$\begingroup\$ it means that I had no output in the oscilloscope, no signal \$\endgroup\$ – Engineer 007 Feb 5 '16 at 14:12
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    \$\begingroup\$ Here's a bench power supply, now what terminals did you use: i.stack.imgur.com/q4Lid.jpg - just state the colours to make it easy. \$\endgroup\$ – Andy aka Feb 5 '16 at 14:15

I used the red and the one in the middle (between black and red)

enter image description here

Use the red and black terminals. If you need to use green (to earth your set-up) then it's normal to connect it to the black terminal.

  • \$\begingroup\$ This hit me as a newbie too. Pretty bad UI design really, although a common one. \$\endgroup\$ – pipe Feb 5 '16 at 14:49
  • \$\begingroup\$ @pipe It's a matter of convention. \$\endgroup\$ – Mast Feb 5 '16 at 14:50
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    \$\begingroup\$ @pipe: only if you have no clue about what gnd is \$\endgroup\$ – PlasmaHH Feb 5 '16 at 14:51
  • \$\begingroup\$ @PlasmaHH There's no reason for the earth connection to be positioned in between positive and negative, especially not when bipolar supplies are common enough. \$\endgroup\$ – pipe Feb 5 '16 at 14:55
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    \$\begingroup\$ @pipe - putting the ground between the + and - makes it convenient to tie either output to ground, as necessary. \$\endgroup\$ – WhatRoughBeast Feb 5 '16 at 15:03

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