• Keep coax cable connecting resistor to screen as short as possible.
  Use RG62U coax cable - low capacity: 13 Pico Farads per foot.  (13 x 10^-12)
• Rise time of signal is determined by R and cable capacity.
  • One Time Constant = R x C
  • R is Resistance in ohms, C is capacity in Farads
  • One Time Constant = 1000 x 50ft RG62U
    (using 50ft of cable)
                                        = 1000 x 50 x 13 x 10^{-12 (FARADS)}
                                        = 5 x 10⁴ x 13 x 10^-12
                                        = .65 x 10^-6
                                        = .65 µ sec.
    
• .65 µ sec. rise time is too long for a Maxwell Technologies (formerly Hewlett-Packard) Flash X-Ray System.  Use pulse shaping circuit.

The circuit shown above is a low cost break circuit that works with a majority of instrumentation input circuitry.

Various other more sophisticated screen circuitry and signal conditioning is available from several equipment suppliers at additional cost.