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MIL-STD 188-125


Part Number: 188-E1-1K

The E1 Suitcase is a completely integrated, portable test system used to satisfy the MIL-STD 188-125 requirement for E1 short-pulse direct current injection up to 1 kA. It is a dual-use system for an inductive coupler or a direct injection output adapter.

Operated using a handheld fiber-optic remote control, the E1 Suitcase includes a calibration fixture that uses a current transformer with traceable components from the U.S. Department of Commerce’s National Institute of Standards and Technology (NIST). This system is battery-powered using commercial-off-the-shelf (COTS) batteries, as well as pressurized, dry breathable air in an onboard pony bottle.

The control and data acquisition option for this system allows the user to enter a desired output current and have the software calculate and set the required charge voltage and air-pressure for the Marx. The data acquisition portion of the software automatically acquires the injected and residual waveforms from the oscilloscope, scales them based upon calibration factors and attenuation, and displays them along with peak current, rise-time, and FWHM. A separate control in the software allows the user to automatically generate a test report at the push of a button.


The E1 Suitcase and internal system are built for rugged, portable use, with logical controls and an onboard battery and air supply. The suitcase is constructed to be impact-resistant and weather-tight with easy-to-transport casters. As for versatility, the suitcase offers direct injection or inductive coupling for use in various applications.

  • Dual-use system for an inductive coupler or a direct injection output adapter
  • Calibration fixture uses a current transformer with traceable components from NIST
  • Size: 24.6 x 19.7 x 8.6 in  (62.5 x 50.0 x 21.8 cm)
  • Weight: 90 lb (40.9 kg}
  • Peak output current: 1.1 kA
  • Peak output voltage: 46 kV
  • Energy per pulse: 10.5 J
  • Pulse rise-time: <20 ns
  • Pulsewidth (FWHM): 500 – 550 ns


The following items are included with the E1 Suitcase:

  • 188-125 E1 portable test system
  • Test fixture with current transformer diagnostic
  • Direct connection output adapter
  • Inductive coupler
  • Fiber-optic remote control
  • Spare battery and charger

The following items are required for proper implementation of the E1 Suitcase:

  • Pressurized dry breathing air (SCUBA CGA grade-E air) for bottle refill
  • Mains power to recharge internal battery (108 – 250 VAC, 47 – 63 Hz)
Parameter Description Value Unit
Ve Erected voltage 70 kV
Ce Erected capacitance 11 nF
Vch Operating charge voltage range 7-35 kV
Pres. Operating pressure range atm-90 psi
L Length 24.6 in
W Width 19.7 in
H Height 11.7 in
Wt Weight 73 lbs
TR Current rise time <20 ns
TW Pulse width, Full Width Half Maximum (FWHM) 500-550 ns


Refer to the latest published standard on MIL-STD 188-125 for further information. Safe operating principles for high voltage and high current must be used at all times when using the E1 suitcase. Operators must abide by the authority having jurisdiction at the end-user facility.


APELC’s selection of add-on features for high-voltage components are designed to increase safety and usability.


Rugged high-voltage quick disconnect cable connectors for voltages up to 700 kV.


Integrated high-speed current diagnostics in high-voltage quick disconnects.


Software to increase user safety and reduce time spent in testing.


Termination and monitoring capability for a high-voltage, high-power pulse without radiating equipment.


Providing the trigger pulse to a Marx Generator through a pulse forming circuit.


Fully integrated power and control units to deliver a turnkey package for our pulsed power systems.


For more information or to discuss a custom or turnkey system, complete the form below and we will contact you within 24 hours.

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