CURRENT-VIEWING RESISTORS ISM Type

Current-viewing-resistors Series ISM allows precise measurement of peak value and waveform of fast rise time current pulses. They excel by high bandwidth, low rise time and high accuracy of resistance value. Below their upper-frequency limit (-3 dB), the current-viewing-resistors ISM behave like pure dc resistors with frequency-independent resistance value. Because of their double coaxial design current-viewing-resistors, ISM are not susceptible to noise and electromagnetic interference.

PARTNER:

HILO-TEST

MARKETS:

Components ,

TEST STANDARDS:

IEC 62475 ,

Data Sheet

Dimensions

SPECIFICATIONS

CURRENT-VIEWING RESISTORS

Type ISM

Current-viewing-resistors Series ISM allows precise measurement of peak value and waveform of fast rise time current pulses. They excel by high bandwidth, low rise time and high accuracy of the resistance value. Below their upper-frequency limit (-3 dB), the current-viewing-resistors ISM behave like pure dc resistors with frequency-independent resistance value. Because of their double coaxial design current-viewing-resistors, ISM are not susceptible to noise and electromagnetic interference.

Maximum RMS current is determined by dissipation, max. peak-current by the impulse-load integral òi²(t)dt. Upon loading with the max. impulse-load integral the resistor requires a recovery time during which it can cool down to ambient temperature. Since the stored thermal energy is almost exclusively dissipated by conduction through the current leads, the recovery time can not be specified in general. It must be determined, considering the heat conduction properties of the current leads of a particular application.

ISM CURRENT-VIEWING RESISTORS

Type	Current rating peak / rms		Nominal resistance	Power	Impulse-load integral	Rise- time	Band- width 1)	Size	Diameter/ Length	Weight
ISM 3P/200	3 kA	8 A	200 mW*	13 W	1300 A²s	7 ns	50 MHz	A1	35/430 mm	1.0 kg
ISM 3P/100	3 kA	10 A	100 mW	10 W	1300 A²s	1.8 ns	200 MHz	A1	35/487 mm	1.3 kg
ISM 5P/50	5 kA	10 A	50 mW	5 W	1300 A²s	1.8 ns	200 MHz	A	50/236 mm	1.5 kg
ISM 5P/20	5 kA	20 A	20 mW	8 W	8000 A²s	1.8 ns	200 MHz	A	50/236 mm	1.5 kg
ISM 5P/10	5 kA	30 A	10 mW	9 W	20000 A²s	1.8 ns	200 MHz	A	50/203 mm	1.4 kg
ISM 5P/5	5 kA	40 A	5 mW	8 W	80000 A²s	7 ns	50 MHz	A	50/203 mm	1.4 kg

ISM 50/10	20 kA	50 A	10 mW	25 W	50000 A²s	1.8 ns	200 MHz	B	65/296 mm	2.5 kg
ISM 50/5	20 kA	60 A	5 mW	18 W	50000 A²s	1.8 ns	200 MHz	B	65/204 mm	2.1 kg
ISM 50/2	20 kA	70 A	2 mW	10 W	50000 A²s	1.8 ns	200 MHz	B	65/149 mm	1.7 kg

ISM 100	40 kA	120 A	1.0 mW	14.4 W	50000 A²s	1.8 ns	200 MHz	B	65/128 mm	1.5 kg
ISM 200	40 kA	220 A	0.25 mW	12.0 W	2*10⁵ A²s	7.0 ns	50 MHz	B	65/118 mm	1.5 kg
ISM 250	100 kA	250 A	1.0 mW	62.5 W	5.6*10⁵A²s	1.8 ns	200 MHz	D	200/160 mm	9.0 kg
ISM 300	100 kA	300 A	1.0 mW	90.0 W	1.3*10⁷A²s	175 ns	2.0 MHz	C	130/417 mm	8.5 kg
ISM 350	100 kA	360 A	0.5 mW	64.8 W	5.6*10⁵A²s	1.8 ns	200 MHz	D	200/160 mm	9.0 kg
ISM 500	100 kA	500 A	0.25 mW	62.5 W	2.2*10⁶A²s	7.0 ns	50 MHz	D	200/160 mm	9.0 kg
ISM 800	100 kA	800 A	0.10 mW	64.0 W	1.4*10⁷A²s	44 ns	8.0 MHz	D	200/160 mm	9.0 kg
ISM 1200	100 kA	1200 A	0.05 mW	72 W	9.0*10⁶A²s	28 ns	12.5 MHz	D	200/160 mm	9.0 kg
ISM 1600	100 kA	1600 A	25 µW	64 W	5.6*10⁷A²s	175 ns	2.0 MHz	D	200/160 mm	9.0 kg

Nominal resistance at 20°C, Resistance tolerance: ±1%, T_k = ± 50 ppm/K, * T_k = ± 100 ppm/K Impulse-load integral òi²dt is based on the temperature rise of 100K. Voltage pickup: BNC

1) theoretical value