ESI-870 Resistance/Resistivity Indicator
4
B.
Controls & Electrodes
1.
The ESI-870 has one active control, a green "Press to Test" button on the
front panel of the instrument. This button performs two functions:
a.
It turns the instrument ON, activating the test circuit and LED's.
b.
It applies test voltage to the electrode(s) and auxiliary connections.
C.
Indication & Resistance/Resistivity Scales
1.
Eleven (11) LED's provide Resistance and Resistivity measurement
indication in one decade increments. (See Figure 1, below.)
a.
Ten (10) LED's represent resistance or resistivity measurements.
b.
One (1) LED is used to indicate when the measurement exceeds
normal testing range, and the range of the ESI-870.
2.
The row of 10 LED's is labeled with
two scales. Both scales are
designed for packaging materials
measurement in accordance with
EIA-541 and ESD Association
standards, and correlate to ASTM
D-257 and ANSI/ESD STM11.11
measurement procedures.
a.
The
Upper Scale
is labeled
for
Surface Resistivity
measurements in Ohms/Square per ASTM D-257
. While the ESI-
870 measurements are in keeping with ASTM D-257 bladed fixture
procedures, these measurements also
correlate
directly to ASTM D-
257 measurements made with a precision concentric ring fixture.
b.
The
Lower Scale
is labeled for
Surface Resistance
measurements in Ohms per
ANSI/ESD STM11.11
standard
. The ESI-870 measurements
correlate
directly to
ANSI/ESD STM11.11 measurements made with its defined, precision
concentric ring fixture. The ESI-870 does not reproduce the ANSI/ESD
STM11.11 procedure; it correlates to ANSI/ESD STM11.11 data.
IV. Accuracy
A.
While the ESI-870 has an automatic resistance range feature, its accuracy is
dependent upon the following factors.
