The KES7721 generate test pulses 2a required by the ISO and SAE
standards. Test pulse 2a is used to simulate the transient phenomenon
where induction occurs in the wire harness when the current flowing in
the device connected in parallel to the tested device is suddenly cut off.
Pulse module 2a
Peak voltage (Us)
±20 V to ± 300 V, in steps of 0.1 V
Output impedance (Ri)
2Ω, 4Ω, 10Ω
Rise time (tr)
1 µs (+0 µs, −0.5 µs)
Pulse width (td)
50 µs ±10 µs at No Load, 40 µs ± 8.0 µs at 4 Ω Load, 12 µs ± 2.4 µs at 2 Ω Load
Repetition interval (t1)
0.2 s to 99 s, in steps of 0.1 s
DC cut time (t2)
1 ms to 100 ms, in steps of 0.1 ms
Surge delay time (t3)
Less than 100 µs
Supplied from the main frame
50(1.96”)W × 260(10.23”)H × 330(12.99”)D mm
Approx. 2.5 kg(5.51lbs)
■ Output impedance： Since 2W, 4W, and 10W can be selected, it supports ISO7637-2.2004SO standards and independent standards of automobile manufacturers.
■ Since it also outputs negative polarity waveforms whose polarity has been reversed, it supports ISO7637-3.2007 standards and independent standards of automobile manufacturers.