Noise Suppression Effect of VFR/VFS Series

cNoise Absorption Effect of EMIGUARDr (VFS9V)

Type of Filter

without EMIGUARD

r

EMI Suppression Effect

Description

Waveform when EMIGUARD

r is not

used.

(Surge from a noise simulator.)

Waveform after the noise passed

through EMIGUARD

r. Little noise is

recorded.

with EMIGUARD

r

D

223S

12-22

100

: 200V/div

: 10ns/div

90

80

20

10

0%

100

: 200V/div

: 10ns/div

90

80

20

10

0%

cComparative Data (VFS9V)

Type of Filter

Without Filters

Conventional varistor

VFS9V

Two-terminal capacitor

(with varistor function)

EMI Suppression Effect

Description

As with the two-terminal capacitor

The two-terminal capacitor is influenced

by lead line inductance, leaving behind

some of the rising and falling edges.

The residual noise can cause the

system to malfunction.

The three-terminal structure eliminates

most of the lead line inductance. This

allows VFS9V to completely absorb the

rising and falling edges of the applied

pulses.

100

90

80

20

1 0

0%

100

90

80

20

1 0

0%

100

90

80

20

1 0

0%

Noise wave applied

1. Absorption of quick-rising, high-frequency noise (10ns/div, 100V/div)

50ns

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• This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.