ED-1100 PORTABLE VARIABLE
EDDY CURRENT INSTRUMENT
EQUIPMENT SPECIFICATION ES-110
1.0 Description
1.1 The Model ED-1100 is a microprocessor
based variable frequency eddy current instrument, with a liquid crystal display
readout, that detects homogeneity and conductivity changes in magnetic and
nonmagnetic materials instantaneously.
The instrument is battery operated, light weight, and can be used in the
manufacturing shop, in the field, and in the laboratory with a wide selection
of probes and coils common to standard Centurion NDT instruments (ED-400,
ED-510XL, ED-520/530 series, ED-800, and ED-810).
1.2 The instrument will detect surface and
subsurface defects in both magnetic and nonmagnetic materials. Defects cause voltage variations that are
amplified and displayed on the LCD in the storage or nonstorage mode. This readout provides maximum information on
eddy current behavior within the material being tested in terms of phase and
amplitude simultaneously. As a matter
of convention, liftoff is displayed as the horizontal line on the LCD and the
crack indication is an upward or downward slanted line that meets the horizontal
at the right extremity of the trace.
The severity of the defect is represented by how far the slanted line
deflects above or below the horizontal.
The phase relationship is the angle between these two lines.
1.3 The ED-1100 will sort
classes of materials according to hardness alloy, carbon content, tensile
strength, and grain structure. Also, it
will measure coating thickness, sheet thickness and measure relative
conductivity of critical materials.
2.0 Mechanical and Construction
2.1 The instrument consists of microprocessor
based circuitry, a back lit liquid crystal display, and rechargeable battery
pack housed in an aluminum case.
2.2 Dimensions: 6.0 (15.2
cm) W x 12.0 (30.4 cm) L and 6.0 (15.2 cm) D with cover closed.
2.3 Weight: 7.5 lbs (3.4 kg)
2.4 The instrument will operate within the temperature range of 0o
F to 120o F, at 85% relative humidity.
2.5 The front panel probe connector is a six
pin LEMO connector. The unit comes with
a probe cable, 6-pin LEMO to dual Microdot, and an adapter, 6-pin LEMO to dual
BNC. Adapters are available to
accommodate other connector styles.
2.6 The bezel surrounding the LCD may be
removed, thus allowing replacement of the scratch shield in front of the LCD
and cleaning when necessary.
3.0 Electrical
and Performance
3.1 The instrument is powered from an
integral rechargeable nickel-cadmium battery, or from the power line (110/60/1
or 220/50-60/1) through the charger while the battery is being charged. The
power consumption is 7.5 watts.
3.2 Battery life per charge is
approximately 12 hours; with the backlight lit this drops to about 6
hours. Recharge time is approximately
14 hours.
3.3 The instrument has a
variable frequency range from 100 Hz to 6.0 MHz. It operates with two probes, a test probe and a reference
probe. The reference probe serves as an
arm in the eddy current bridge to facilitate balancing. Any of the standard Centurion NDT probes
from our current instrument line (ED-520 series, ED-530 series, ED-800 and
ED-810) may be used. In cases where the
probe connector does not match the ED-1100 front panel connector, adapters can
be obtained.
3.4 The liquid crystal display
(LCD) of the ED-1100 is a storage monitor that shows a flying dot display
featuring random access memory with storage locations allocated to the
LCD. As such, the instantaneous
movement of the dot may be viewed on the display without storage or the dot
movement may be stored on the display.
When a suitable pattern, representing the limits of a given test, has
been established and stored, the instrument can be switched back to the
instantaneous mode. As the test is
being made, the stored information remains on the display and the instantaneous
flying dot can be superimposed on the LCD for matching the known to the
unknown.
4.0 Operation
4.1 The FREQUENCY keypad is used for establishing a suitable test frequency
from 100 Hz to 6 MHz read on the LCD in hertz and special functions as
described below.
4.2 The Probe DRIVE controls the power to the probe. As the probe drive is increased and the
amplifiers go into saturation, the
OVERLOAD indication will illuminate on the LCD. For optimum performance, the probe drive should then be decreased
until the OVERLOAD indication goes
out.
4.3 The GAIN control varies the
gain of the instrument over a range of 100:1.
4.4 The PHASE control allows
rotation of the display from 0o to 360o.
4.5 The EXPAND
pushbutton amplifies the signal in the Y-axis by 3 times.
4.6 The DOT POSITION controls
adjust the position of the dot on the display in the all modes of operation.
4.7 The CHARGE indicator lights when the battery pack is receiving current
from the battery charger. The
instrument must be off for the battery to receive maximum charge in shortest
time.
4.8 The POWER
pushbutton is used to turn the unit on and off. The embedded LED lights to indicate that power is being supplied.
4.9 The AUTO
push-button toggles between AUTO-NULL
and STD-NULL as read on the LCD. In AUTO-NULL,
the dot is set by the dot position controls and will return to that location
when the bridge is balanced. In STD-NULL, the dot is set by the dot
position controls, but will return only when the NULL push-button is depressed.
The null point can be located anywhere
on the LCD using the DOT POSITION
controls. This new location now becomes
the zero point.
4.10 The
NULL pushbutton is used when in the STD-NULL
mode to balance the bridge. The dot
will be observed returning to the position selected by the dot position
controls.
4.11 The ERASE pushbutton
will remove the stored signals on the LCD.
4.12 The STORE
pushbutton toggles between STORE, NON-STORE, and TIME BASE. In the STORE mode, the eddy current signals
will be saved on the LCD until the ERASE
pushbutton is pushed. In the NON-STORE mode, no signal is saved on
the LCD. The TIME BASE mode is
represented as a signal that is swept across the display from left to
right. A flaw signal will be
represented by a vertical indication.
4.13 The BLITE push-button turns
the LCD backlight on and off.
4.14 The ACCESSORY
connector is available to access analog signals that would be required for a
strip chart recorder, reading the horizontal or vertical deflection of the dot,
audio or threshold gate, etc.
5.0 Order Reference
5.1 Model ED-1100 Portable Crack Detection
and Sorting Instrument, P/N 225340
in an aluminum enclosure with handle and
including:
Probe Cable,
6-pin LEMO to dual Microdot
Adapter,
6-pin LEMO to dual BNC
Power
Supply/ Battery Charger (must
specify 110V or 220V)
Operating
Manual
5.2 Standard Accessories
5.2.1 Power Supply/Battery
Charger, P/N 520104. Fits into top cover and permits operation of
instrument on 110VAC, 50/60 hertz, single-phase line current.
5.2.2 Power Supply/Battery Charger, P/N 520127. Permits
operation of instrument on 220VAC, 50/60 hertz, single phase.
5.2.3 Rechargeable
Nickel-Cadmium Battery Pack, P/N 225351.
5.2.4
Probe Cable, P/N 225364. Six pin LEMO connector to dual Microdot
cables, 72 inches long.
5.3 Addendum Accessories
5.3.1 Model ED-1100 Starter Kit, P/N 225383 includes:
1 each P/N
226020, Titan Series Probe Cable
1 each P/N
226030, Titan Series Pencil Probe, 6.5 long angled
2 each P/N
207067, Medium frequency surface probe, 5/16 diameter
2 each P/N
213263, Low frequency corrosion probe, 9mm diameter
1 each P/N
225389, Multi-functional Test Block
5.3.2 Model
TH-1100 Audio/Threshold Gate, P/N 225390
5.3.3 Model
HS-50 Bolt Hole Scanner, P/N 222650
5.3.4 Single
Channel Strip Chart Recorder, P/N 519345
5.3.5 Aluminum
Test Block with single slot .015 deep, P/N
205156
5.3.6 Aluminum
Test Block with three slots, .008, .020, and .040 deep, P/N 207066
5.3.7 Steel Test Block with three slots, .008, .020, and .040 deep, P/N 220004
5.3.8 Balancing Load, medium frequency, BNC connector, P/N 209730
5.3.9 Balancing Load, high frequency, BNC connector, P/N 209735
5.3.10 Consult the probe catalog
for the many standard probes and coils available for use with the ED-1100. The ED-1100 design requires a dual coil sensor arrangement for
proper instrument operation. If a
single probe is required, see the Titan Series Probes, they are a dual coil
probe series. Consult factory for
further information.
6.0 References
6.1 Instruction Manual, Form No. 25001
6.2 ES-111 for TH-110 Audio/Threshold Gate
6.3
ES-103 for HS-50 Bolt Hole Scanner
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