ESD SYSTEMS.com

3M

Features

Model 41116

Model 41137

Model 722

Monitor Utility Ground

No

Yes

No

Method

N/A

<1K Ohm between Neutral & ground

N/A

Monitor Operator

Yes, 1 operator

Yes, 2 operators

Yes, 2 operators

Method

Waveform distortion Analyzer

Waveform Distortion Analyzer

Impedance

Monitor Worksurface

Yes

Yes

No

Worksurface Monitoring Method

Resistance

Resistance

unknown

Wrist Strap alarm

Instant, Audible & Visual

Instant, Audible & Visual

Delay, 1sec, Audible & Visual

Wrist strap range

500K - 35M Ohm

500K-35M Ohm

1.5 - 10M Ohm

Worksurface Max Limit

500M Ohms

500M Ohms

3.7M Ohm

Worksurface Alarm

Audible & Visual

Audible & Visual

Audible & Visual

Max Tribocharge Voltage Attained

<5V

<5V

unknown voltage level

Wrist Strap required

Standard

Standard

Special plug

Passes ESD S1.1 Safety Breakaway Force

Yes

Yes

No

Wires to hook up monitor

2-wire hook up

2-wire hook up

4-wire hook up

Pulsed Testing Voltage

none

none

18VDC

Test current on wrist

1 micro Amp

1 micro Amp

variable amperage

Moisture lotion for wrist

Not Necessary

Not Necessary

Use metal bands

Skin irritation from voltage/current on wrist

No

No

unknown

Actual Monitoring Time

Continuous

Continuous

Once every 2 Seconds