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Zero Charge™ A-400 Universal Resistance Checker
Surface resistivity, surface to ground and point to point resistance indicator
Features
  • Measures surface resistivity, surface resistance to ground and point to point resistance.
  • Easy to use -supplied with 2 cables for point to point resistance check.
  • Extended range of direct readings in ohms per square for surface resistivity measurements and in ohms for surface resistance to ground and point to point resistance.
  • Portable and light - uses 9-volt battery.

Three functions of A-400 Universal Resistance Checker

A/ Surface resistivity check
Pair of stainless steel electrodes to measure surface resistivity
For surface resistivity readings place the meter on the surface being tested and press the center button labeled TEST. If the LED labeled 106 illuminates, the surface under test has surface resistivity of 106 ohms per square or less. If the LED labeled "insulative" illuminates, the surface under test has surface resistivity greater that 1012 ohms per square. (Be sure the ground wire is not connected through the ground jack when surface resistivity is measured.)
B/ Surface to ground resistance check
Ground jack used when measuring surface to ground resistance
Place the meter on the surface being tested. Connect the meter to a known ground through the ground jack. Note: When the ground wire is connected through the ground jack, the meter will not measure surface resistivity. Press the center button labeled Test and the LED will illuminate to indicate the resistance to ground. If the LED labeled insulative illuminates, the resistance to ground of the surface under test is greater that 1012 ohms.
C/ Point to point resistance check.
Jacks to connect the wires for point to point resistance check (Wires are supplied with the unit)
Place the meter on the flat surface. Connect the two test wires supplied with the meter to the jacks on the top of the meter (jacks shown on the picture on the left side). Connect the other side of the wires (crocodile clips) to the two points between which the resistance is to be checked. Press the center button labeled Test and the LED will illuminate to indicate the resistance between these two points. If the LED labeled " insulative" illuminates, the resistance between the two points is greater that 1012 ohms.
Technical specifications
Range Automatic form
103 Ω/Sq to 1012 Ω/Sq for surface resistivity
103 Ω to1012 Ω for surface to ground resistance
103 Ω to1012 Ω for point to point resistance
Display LED's - one per decade.
Accuracy ±10%
Changeover Point ½ decade on a logarithmic scale (3.16 x 10n)
Changeover Point Accuracy ±½ decade
Power 9 volt battery.
Battery life over 40 hours of continuous use
Dimensions 2.40" x 1.02" x 3.78"
(61mm X 26mm X 96mm)
Wight 6 ounces (170g)
NOTE
Bottom/Red Light on the tester indicates BATTERY LOW.
Test is not valid when this light is on.

A-SRP Set 

A-SRP Set.jpg Set of two surface resistivity probes for ZeroCharge Meter A-400.  The probes allow to measure larger surfaces, ESD chairs, labcoats etc. 

A-HRP Set 

A-HRPS.jpg 

The A-HRP set includes the probe, the plate and the connecting wires.

To measure the footwear, the shoe shall be placed on the metal plate and the probe inside the shoe. The probe shell be pressed to assure good contact with the inner surface of the shoe. The resistance checker will then show the resistance across the sole of the shoe.  

The A-400 meter is not a part of the set.

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Order Now Part Number Description Price
USD
A-400 Universal Resistance Checker for surface, surface to ground and point to point measurments. Best value. Digital, microprocessor controlled. Does not require re-calibration. Pocket size, reliable ready to work with 5 Ib probes and the shoe testing probe.
Qty1 - 910 +
Price$339.90$299.90
A-HRP Set A set of the hand probe and the testing plate to properly measure ESD shoes. Best value to test the shoes.
Qty1 +
Price$129.90
A-SRP Set A set of two, 5 Ib probes as an accessory for A-400 Surface Resistivity Tester. They are intended for use to measure chairs, labcoats and ESD floor sections. Best price guaranteed.
Qty1 +
Price$119.90