The CM-500A dual lead wrist strap is essentially two separate wrist swaps in one, separated by an isolating border. This allows for a completely resistive measurement, similar to the operation of the WSST-300
unit.
The user can wear two separate wrist straps (if another type of wrist swap is preferred) and connect them to the CM-500A, and achieve the same constant monitor function.
The dual strap technique allows the test voltage to come out on one lead, create a current that flows through the skin, and return to ground via the second lead. True resistive testing provides a more accurate and
consistent check of the wrist strap, wrist strap cord, and wrist strap to operator connection.
Thông số kỹ thuật
Qty Part
1 ground cord
1 Mounting bracket with 2 spacers and 2 screws to attach to unit only
1 Hardware set for optional grounding method with screw and lug
1 CM-500A unit
1 AC adapter
4 Rubber feet for freestanding operation
Resistance tolerances:
The CM-500 uses a dual lead wrist strap to monitor the operator’s resistance to ground. The resistance
measured includes the resistance between the monitor point and the operator, with the operator tied to
ground through the monitor point. The effective operator resistance being checked is different from the total loop resistance being checked. The upper limit for the operator’s effective resistance to ground is 10 megohms. The actual resistance limits are as listed under “Calibration Check” do not
include an internal resistance to ground of 1 megohm:
Power:
12OVAC. 60Hz, (3 pronged grounded plug) input to AC adapter with 12VDC, 50ma,
Output ( -/GND lead from adapter connected to ground pin on AC adapter)
Wrist Strap Test Voltage: 7.6 volts nominal
Optional Wrist Strap 1 meg ohm nominal in each wire of the cord
Cord Resistance:
Available Accessories:
Dual lead wrist strap (Available in Small, Medium & Large)
Dual lead wrist strap cord (Available in 6, 10, 12 & 20 foot lengths)
Replacement ground cord