uTracer Tube Tester / Tube Curve-tracer:

• Overview:
  • Pulsed measuresment of diodes, triodes, penthodes, etc.
  • 13 pre-defined measurements:
    1. Ia,Is versus Vgrid; stepping Vanode; Vscreen & Vheater constant
    2. Ia,Is versus Vgrid; stepping Vanode=Vscreen; Vheater constant
    3. Ia,Is versus Vanode; stepping Vgrid; Vscreen & Vheater constant
    4. Ia,Is versus Vanode; stepping Vscreen; Vgrid & Vheater constant
    5. Ia,Is versus Vanode=Vscreen; stepping Vgrid; Vheater constant
    6. Ia,Is versus Vscreen; stepping Vgrid; Vanode & Vheater constant
    7. Ia,Is versus Vscreen; stepping Vanode; Vgrid & Vheater constant (positive grid bias mode)
    8. Ia,Is versus Vanode; stepping Vscreen; Vgrid & Vheater constant (positive grid bias mode)
    9. Ia,Is versus Vheater; stepping Vgrid; Vanode & Vscreen constant
    10. Ia,Is versus Vheater; stepping Vanode; Vgrid & Vscreen constant
    11. Ia,Is versus Vanode, stepping Vg with Vs = UL(Va,k) simulating ultra-linear operation for pentodes
    12. Ia,Is versus Vgrid, stepping Vg with Vs = UL(Va,k) simulating ultra-linear operation for pentodes
    13. Ia,Is versus Vanode; stepping Vgrid; Vscreen & Vheater constant; simulating “Schade” feedback
  • Plot transconductance (Mutual Conductance) as function of bias
  • Plot output resistance as function of bias
  • Continuous measurement of magic eyes
  • Matching of double-triodes (second anode connected to screen terminal)
  • Quick Test feature which measures: nominal currents, Rplate, Gm and mu in a matter of seconds without the need to plot full curves!
    Printed report with main parameters!
• Anode and Screen voltage sources:
  • 2 to 400 V, resolution 0.4 V
  • Simple circuit variant available for low voltage tubes (Click Here)
  • Measurement pulse 1 ms
  • Nominal output current 200 mA
  • A simple circuit mod increases the current to upto 1A !! (Click Here)
  • Maximum output power 60 W
  • Hardware current limit 250 mA
  • Programmable compliance: 25, 50, 75, 100, 125, 150, 175, 200 mA, response time 20 us
  • Short circuit proof
  • Linear / logarithmic sweep
• Anode and Screen current measurement:
  • 0 to 200 mA in 8 ranges with 9.5 bit resolution
  • Fully auto ranging or manual range selection
  • Auto averaging or manual average selection
  • ranges: 0-1 mA, 0-2 mA, 0-5 mA, 0-10 mA, 0-20 mA, 0-40 mA, 0-100 mA, 0-200 mA
  • A simple circuit mod increases the current to upto 1A !! (Click Here)
• Grid bias; negative:
  • 0 to -50 V, resolution 50 mV
  • Protected against short circuits
  • Linear / logarithmic sweep
  • A small circuit allows you to zoom in for low grid voltages and even positive grid biases and current! (Click Here)
• Grid bias; positive: (more )
  • Triodes only (screen supply is used source)
  • 0 to 200 V
  • 0 to 200 mA
  • Pulsed, so no grid dissipation
  • A small circuit allows you to zoom in for low grid voltages and even positive grid biases and current! (Click Here)
• Heater:
  • 0 to Vsupl (nom. 19.5 V)
  • Higher voltages with external supply
  • 1.5 A max, limited by fuse
  • Direct and indirectly heated cathodes
  • Soft start, 0-100% in 10 seconds
  • External power supply can be used for higher voltages or low voltage / high current heaters (more)
• Data representation:
  • On screen graphic presentation with cursor function
  • Automatic or manual scaling of axis
  • 2 to 25 order polynomial fit though data for extraction of transconductance or output resistance
  • Store graph to file in bmp format
  • Store data in table format (several formats possible)
  • Storage of all tube specific measurement settings!
• Many extensions / options available!
  • Android App control (Click here)
  • Special version for low anode/screen voltages (Click here)
  • Small and even positive grid voltages (Click here)
  • Test Transistors with the uTracer (Click here)
  • Form electrolytic capacitors with the uTracer (Click Here)
  • Increase the current range of your uTracer to 1A! (Click here)

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