Man-S1720
BOKAR International 650 Scranton Pocono Hwy., Covington Twp., PA 18444 USA
www.bokar.com Tel: (570) 842-2812 E-mail: bokar@bokar.com
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A-401 Set:Universal ESD Cart and ESD Chair Resistance Checker
Measures the ability of an ESD Chair or ESD cart to discharge static electricity to an ESD floor or
Floor mat.
Fig. 1 Fig. 2 Fig 3 Fig 4
.
How to use the A-401 Set to verify an ESD-safe Cart’s compliance with standards:
1. Place four plates on the floor. Connect them with each other, the meter and a probe as shown in Fig 1.
2. Place the cart on the plates so that each wheel is in the center of a plate.
3. Move the Probe and the Meter to the top shelf of the Cart without disconnecting the wires (Fig 2).
4. Press the button in the center of the meter to read the resistance of the Cart’s top shelf to the floor.
It should read < 10e9
Note: You are testing the empty cart without any load. Under load, the cart’s wheels will have better contact
with the floor and the resistance of the top shelf to the ground will be lower than your reading during the test
5. Move the Probe to the next shelf and repeat the measurement.
If the measurements of all shelves are within the required standard. your Cart is safe to use and will discharge
static electricity when rolled on an antistatic floor.
Note: Cart compliance verification should be done as required by your Company Practices. The static safe
wheels will collect dust from the floor which in time can form an insulative layer that electrically separates the
wheel from the floor, preventing discharge of static electricity from the Cart to the floor.
How to use the A-401 Set to verify an ESD safe Chair’s compliance with the standards:
Fig. 3 Fig. 4
1. Place five plates on the floor. Connect them with each other, the meter and a probe as shown in Fig 3.
2. Place the chair on the plates so that each wheel is in the center of a plate.
3. Move the Probe and the Meter to the seat of the Chair without disconnecting the wires (Fig 4).
4. Press the button in the center of the meter to read the resistance of the Chair seat to the floor.
It should read < 10e9
Note1: You are testing an empty chair without any load. Under load, the chair wheels will make better contact
with the floor and the resistance of the seat to the ground will be lower than your reading during the test.
If the measurements are within the required standard your Chair is safe to use and will discharge static
electricity when rolled on an antistatic floor.
Note2: The Chair compliance verification should be done as required by your Company Practices. The static
safe wheels will collect dust from the floor which can form an insulative layer electrically separating the wheel
from the floor preventing discharge of static electricity from the Chair to the floor.
The A-401 Set allows quick verification of
compliance with required standards for ESD-Safe
carts and ESD-safe chairs in a matter of
minutes. Compact and easy to use, it includes an
A-400 Resistance Checker, 5 conductive plates, a
5 Ib probe, and a set of cables.
