A-400 Universal Resistance Checker

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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.