Monroe Electronics Resistivity Meter - Portable - Surface - model 272A - Manual (Page 3)

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INTRODUCTION:
The Monroe Electronics Model 272A Portable Surface Resistivity/Resistance Meter provides
fast repeatable measurements of both surface resistivity and resistance to ground in one
versatile instrument. Its improved accuracy and digital readout make it ideal for checking and
evaluating static control products such as static dissipative bags, mats and work surfaces and
resistance of work surfaces to ground. The Model 272A’s convenient size, portability and
rugged construction make this meter ideally suited for applications in a manufacturing
environment.
FEATURES:
 Measures both surface resistivity and resistance to ground
 Easy to use - autozero - no adjustments required
 Portable - uses rechargeable battery for 8 hours continuous use
 Improved accuracy - ±0.1 decade with digital readout
 Guarded ring electrode weighing 5 pounds conforms to standards
 Wide range of direct readings in ohms per square (/
) for surface resistivity or ohms
() for resistance to ground
 Switch selectable measuring voltage - 10 volts or 100 volts
 Displays value in scientific notation or 3-place log
SPECIFICATIONS:
RANGE: From 8 x 10E3 to 2.0 x 10E13  or 8 x 10E4 to 2.0 x 10E14 / 
INSTRUMENT ±0.1 decade thru 10E12, ±0.15 decade above 10E12
ACCURACY: (typical); ±0.1 decade thru 10E9, ±0.15 decade thru 10E11; ±0.2 decade
above 10E12 (maximum)
MEASURING 10 volts for 8.0 x 10E3 to 2.0 x 10E12  or 8.0 x 10E4
VOLTAGE 2.0:10E13 /  and 100 volts for 1.1 x 10E5 to 2.0 x 10E13  or 1.1 x
10E6 to 2.0 x 10E14 / 
DISPLAY: 16x1 LCD alpha/numeric display will show:
Operation mode -  or / 
Readings in log or scientific notation
Applied voltage
Low battery
Also used in SETUP mode
POWER: Rechargeable battery with 100 VAC, 120 VAC or 230 VAC
adapter/charger supplied. Power requirement is 16 VAC or DC (either
polarity) @ 1.25A. Connector plug is 5mm OD; 2.55mm ID. Battery
operation up to 8 hours continuous use
ELECTRODE: Guarded ring electrode recommended by ASTM D-257 weighing five
pounds (2.7kg). The outer electrode is a ring having an inside diameter
of 2.25 inches 5.72cm) and a width of 0.125 inches 0.32cm). The inner
electrode is a disc with an outside diameter of 1.2 inches (3.05cm). The
electrode assembly is separate from the meter and is connected to the
meter by a cable 3 feet (91 cm) in length.
A two-sided specimen support plate is included.
DIMENSIONS: Electrode - overall height - 4.0 inches (10.2cm)outside diameter - 3.0
inches (7.6cm) Meter - height - 2.5 inches (6.4cm) width - 6.0 inches
(15.2cm) depth - 6.0 inches (15.2cm)
Recommended factory calibration cycle is one year.