• Steady State DC Dual Polarity Signal yields virtually zero voltage on the operator
• Default operator test voltage of 200 mV*
• Designed for the most critical applications such as disk drive manufacturing and semiconductor fabrication
• Provides continuous ground monitoring of two operators, two supervisors, two workstations and two tool grounded stations
• Features two charge detection indicators that monitor voltage on the operators' circuits
• Most advanced means of monitoring the ground path for operators, workstations, and equipment
• Operator remotes are enclosed in stainless steel for better durability and cleanliness
• Made in the United States of America
• 5-year limited warranty

Note: Work surface must have a conductive layer such as Dual Layer Rubber or Dissipative 3-Layer Vinyl or Micastat® Dissipative Laminate with conductive buried layers. Our Continuous Monitors are not recommended for use with homogeneous matting.

Continuous Monitors pay for themselves improving quality, productivity, eliminating wrist strap daily testing and test result logging. "The wrist strap system should be tested daily. Daily testing may be omitted if constant monitoring is used." (ANSI/ESD S1.1 Annex A, 3 Frequency of Functional Testing)

"Typical Test programs recommend that wrist straps that are used daily should be tested daily. However, if the products that are being produced are of such value that knowledge of a continuous, reliable ground is needed, and then continuous monitoring should be considered or even required."(ESD Handbook ESDTR20.20 paragrapah 5.3.2.4.4)

“This type of monitor [Resistance (or Dual Wire) constant monitors] is used with a two wire (dual) wrist strap. When a person is wearing a wrist strap, the monitor observes the resistance of the loop, consisting of a wire, a person, a wristband, and a second wire.  If any part of the loop should open (become disconnected or have out of limit resistance), the circuit will go into the alarm state.”
“There are two types of signals used by resistance based constant monitors; steady state DC and pulsed DC.  Pulsed DC signals were developed because of concerns about skin irritation.  However, pulse DC units introduce periods of off time (seconds) when the system is not being monitored.” (ESD TR 12-01 Section 2.3)

“Activities that handle items that are susceptible to less than 100 volts HBM may require additional control elements or adjusted limits.” [ANSI/ESD S20.20 section 2.0]

US patents 6,052,053 and 6,205,408