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Pulser
Type.................................................................... Switchable
Spike/Square
Amplitude.................................................................. 300volts into
50ohms
Damping................. Selectable 30, 34, 40, 50, 70, 100, 200, 1 kohms Receiver
Tuned Frequencies..................................................... 1, 2.25, 5, 10,
15 MHz
Wideband Bandwidths......................................... 1-20, 3-20, 5-20,
5-30 MHz
Gain.............................................. Adjustable -28 to +81.8dB in .05dB
steps
Display Presentation..................................................... RF, +, -, ±, Hi
Res±
Reject..................................................... Linear reject adjustable 0-80%
f.s
Mode........................................................ Pulse/Echo, Pitch/Catch
(THRU)
Amplitude Gate (XU-2240,XU-2250)
Modes............................................................................. Normal,
Interface
Blanking Interval..................................................... Adjustable .05-1000
μsec
Delay,Gate Interval.................................................. Adjustable .05-1000
μsec
Alarm Polarity.....................................................................
Selectable Hi/Lo
Alarm Level................................................................ Adjustable
0-100% f.s.
Detector Output.............................................. 0-10 volts analog, 8bits
digital
Cyclic Operation............................... Allows up to 16 separate gate positions
Thickness Gate (XU-2250)
Modes........................Selectable contact, delay line (immersion) or thin wall
Ranges.................................................. Selectable .01£¢ to 1£¢, .1£¢to
10£¢
Display(LED readout)...................................................... 3 digits, .999,
9.99
Signal Conditioning..................................................... Adjustable
AGC,DGC
Thickness Output......................................... 0-10volts analog, 10bits digital
Resolution........................................................................................10bits
Alarms............................................. Hi, Lo & No-Test(TTL level
compatible)
Computer Interface
RS-232 Serial, RS-485 High Speed Serial Command Link, RS-485
High Speed Serial Data Link, lsolated Parallel
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Features of the XU-2468:
· Large EL display
· Fast and easy Test Setup
- Direct access keys and three quick knobs allow immediate changes of
multiple functions.
· On Line Help
makes manual nearly obsolete.
· Digital Single Shot Peak Detection
can accurately detect & measure a flaw each rep, at a rep rate of 24 kHz.
The XU-2468 is an eight channel flaw detector and thickness gauge incorporating an
electroluminescent waveform display panel. Its high-speed systems capability, coupled with
its user-friendly design make the XU-2488 the best choice.
The XU-2468 is ideally suited for high-speed systems application. Digital Single Shot Peak
Detection enables the instrument to detect and measure a flaw in one rep. This, combined
with a rep rate of 24 kHz, results in unparalleled high-speed testing.
Four gates are incorporated into the XU-2468 to provide unmatched flexibility and economy.
Flaw detection, thickness detection, surface following, back following and back echo
attenuation capability are all provided
Each channel can be individually set to operate as a flaw detector or thickness gauge. If
a channel is set to flaw detect then Gates 1-4 can be enabled as flaw detectors. If a
channel is set to thickness detect then Gate 4 is a Hi-Res thickness gauge with a
resolution of ±.0001". Gate 1 can always be used as a surface detector for any gate
set to surface follow.
The large 4.5 × 3.4 display screen provides an uncluttered view of the waveform. Four
measurements and three Quick Knob functions are visible without interrupting the waveform
display. A pop-upcursor enables quick setup of ultrasonic tests and provides measurements
of tests and provides measurements of both thickness and amplitude.
All Xactex keys and functions are straightforward and indicated with clear, concise
text-no confusing graphics. Large, legible characters are used for all measurements and
instrument settings.
Testing can begin quickly with the XU-2468, Direct Access Key (such as PULSER/RECEIVER,
GATE1-4 and RANGE) require only a single key stroke for immediate adjustment of multiple
instrument functions using the three Quick Knobs.
Once a Direct Access Key is pressed, the most commonly adjusted functions appear above the
three Quick Knobs and a pop up Function Menu appears in the upper right hand corner. The
left and middle Quick Knob are reserved for controls which are frequently changed. You can
select any control from the Function Menu and adjust it with the right Quick Knob using
the Menu Select Keys. The pop up menu disappears at the touch of a key, so your waveform
display remains uncluttered.
A user-defined Key, MY MENU, can be set up by the operator to access the three functions
most often used in a test.
If you have any questions you do not need to search for your manual. Press the Help key
and a pop up window immediately displays a description of the function you are adjusting.
The advanced design and performance of the XU-2468 provides high-speed testing without
complicated setup procedures. So you can concentrate on your testing... not an instruction
manual.
Direct Access Keys
PULSER/RECEIVER..........allows access to all P/R functions, including GAIN,
REP RATE, REJECT, DAMP.
GATE 1-4........................individual access to all gate positions and flaw and
thickness gate functions, including Alarm Level,
Back Following Gate, Qualifiers.
RANGE............................controls horizontal range functions, such as
RANGE, DELAY, VELOCITY.
MY MENU........................user-defined key to access the three most
frequently-used functions in a test.
FUNCTION.......................accesses advanced instrument setups, such as I/O,
DATA LOGGER, Buzzer.
CURSORS.......................allows quick Amplitude/Thickness measurements,
without positioning the Gate.
CH SETUP.......................allows quick setup of the selected channel to
operate as a flaw detector or thickness gauge.
SPECIAL KEYS
CHANNEL SELECT........selects the channel of interest to display or calibrate.
SAVE MEAS......................immediately saves a Thickness and /or Amplitude
measurement.
SAVE WAVEFORM............................immediately saves displayed waveform.
PRINT.......................prints either the displayed waveform or the data logger
measurements.
FREEZE...................freezes the displayed waveform for analysis or printing.
LOCK.....................locks front panel controls to prevent inadvertent changes
to settings during a test.
Additional Features
A split screen allows the A-Scan and a magnified section of the A-Scan to be displayed
simultaneously.
Memory can store up to 300 waveforms and 30 setups.
Amplitude and thickness measurements are made each rep.
Physical Specifications
Dimensions................................................................ 9 1/8"W
× 6 5/8"H × 16"D
Weight....................................................................... 15 lbs
Operating Temperature................................................ 0¡É to 55¡É
Power........................................................................
100 W
Display Specifications
Size......................................................... 4.5" ×
3.4"
Type........................................................ flat panel
electroluminescent(EL)
Update Rate............................................. 60 Hz
Viewing angle........................................... 160°
Pulser Specifications
Rep Rate................................................ 100 Hz to 24 kHZ, in 100 Hz steps
Damping................................................. selectable, 50, Hi.
Pulse Width............................................ adjustable, 30-650
ns
Amplitude............................................... 300V into 50
Receiver Specifications
Pre-Amp Gain........................................ adjustable, -30dB to in 0.1dB steps
Common Gain........................................ selectable, 0-80dB in 10dB steps.
Turned Frequencies................................ 1, 2.25, 5.0 ,10.0, 15.0
Wideband Bandwidths............................. 1-20, 3-20, 5-20, 5-20 MHz
Waveform Display................................... switchable; RF, Detected RF
(+,-,±,
Hi Res ±), Time-of-Flight
(TOF),
and Echo Blanking.
Data Logger Specifications
2500 measurement readings total (Thickness and/or Amplitude). Up to 99 files may be stored
to print or review.
Input /Output Specifications
Command Link................................. RS-232, 9.6 k Baud or RS-485,
1 M Baud
Data Link........................... RS-485, 1 M Baud 20 bit Thickness, 8 bit Amplitude.
Analog Output............... up to 4 provided. An output can be assigned to any
combination
of 4 measurements (Flaw or Thickness)
Alarms......................................... selectable Hi/Lo for each Thickness Gate;
TTL alarm for each Amplitude Gate.
Parallel Port................ generate hard copies of waveform or data on a printer.
Accessories
NDT Silver..................... Windows 95/NT based software with instrument control,
strip charts, alarms, and reports.
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Eight-Channel
Multiplexed Flaw Detector
The XU-2248 can on any rep : Fire any one of 8 pulsers
Listen with any one of 8 receivers
Store the result in any of 16 gates
High speed RS-485 serial links give fast, reliable data/control from
external controller
Integral multiplexer improves system performance |
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The XU-2248 is an 8-channel multiplexed ultrasonic flaw
detector. It uses the newest technology for the 8 pulsers, 8 receivers and
16 gate channels incorporated into the XU-2248.
The many interfacing
options available to an ultrasonic system developer permit the XU-2248
to
be integrated into the virtually any computer-controlled test system.
A
variety of data reduction algorithms, incorporated into the XU-2248,
substantially reduce the data that must be transmitted to the system
controller.
They also reduce the system overhead.
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The XU-2248 provides an improved, coat-effective alternative
for for multiplexed systems.
Traditionally, a multiplexed system
"patches" together an external multiplexer and a conventional
flaw detector and the multiplexer are often not well matched.
Since an
external multiplexer replaces the most important part of the flaw
detector,
it may compromise the system performance of an otherwise good
flaw detector.
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Front panel controls on the XU-2248 allow for a very wide
range of applications in ultrasonic
test systems. The Damping and width of
each pulser are individually adjustable, and the
operator can choose
pulse-echo or pitch-catch operation for each pulser, as well.
The rep rate
is adjustable from 100 Hz - 10 kHz and is shared among all of the
channels.
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The Gains of each receiver amplifier are fully adjustable,
individually.
In addition, a common Gain control provides for rapid
adjustment of all of the channels together,
as does Reject and Frequency.
Tying two receiver inputs together provides separately (the example system
uses this idea to get separate gains for pulse-echo and pitch-catch
operation).
The XU-2248 output is monitored by an external oscilloscope.
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The 16 gate channels each have a separate Alarm Output and
Peak Detector.
Alarm LED's on the front panel give a visual alarm
indication. The peak detected output from
any gate channel (selected from
the front panel) can be applied to the Analog Output on the
rear panel. All of the peak detector outputs are available to a system controller over
the high speed serial link. Alarm Filters for each of the gate channels
are separately adjustable
and allow the XU-2248 to be used in noisy industrial environments without generating spurious
alarm indications that
would slow system test throughput.
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In addition to these individual gate controls, the XU-2248
allows a gate to be re-positioned
on every rep. These gate controls
include Blanking, Delay, Width and Alarm Level.
Thus, the reps assigned to
be a particular Gate Channel may have many gate positions
and Alarm
Levels.
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Flexible triggering controls permit the operator to trigger
an external oscilloscope on (and thus View) any individual rep, when any
particular pulser fires, when any particular receiver "listens",
or when any particular gate channel is used. The operator can also program
the XU-2248
to trigger on an arbitrary group of reps.
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Using the concept of cyclic operation, pioneered by
Xactex
in the XU-2248 Flaw Detector,
the XU-2248 can generate complex, cyclic
test sequences.
These test sequences can be programmed from the instrument
front panel or input from an
external IBM -compatible PC, using the UT-QWIK software supplied with the XU-2248.
On any given Rep in the cyclic
sequence, the XU-2248 can fire any one of the 8 pulsers,
"listen" with any one of the 8 receiver amplifiers, and apply
the results to any one of the 16 gate channels. One possible sequence is
illustrated for a common weld test system by the accompanying Figure and
Table.
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This system uses two parts of transducers.
Each transducer
in a pair is "aimed" at its mate, making pulse-echo and
pitch-catch operation possible. The inputs of two receivers are tied
together, which allows separately adjustable gains
for pulse-echo and
pitch-catch operation.
Referring to the table, which displays the
programming of the rep sequence,
the first four reps are pulse-echo tests
involving all four transducers.
The next four reps execute a pitch-catch
test between transducer pairs to check coupling.
Note that the
"results" of the coupling check are all applied to Gate 1,
though they could be
applied to four additional gates, if desired. Reps
9-12 and 13-16 are repeats of reps 1-4.
This Table illustrates a 16-rep
sequence that will repeat during the next 16 reps and continue repeating as the test progresses.
Sequences up to 128 reps can be programmed, stored
and recalled by the XU-2248.
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SPECIFICATIONS
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PULSERS - 8 separate pulsers are provided. One pulser may be
triggered on each rep. |
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Common Pulser Controls
Specifications and Outputs |
Type |
Square wave |
Amplitude |
300 Volts into 50 Ω |
Rep Rate |
100 Hz to 10 kHz in 100 Hz steps |
Rise Time |
Less than 15 ns |
Individual Controls |
Damping |
Selectable, 50 Ω or 1 kΩ |
Pulse Width |
Adjustable 30 - 650 ns |
Mode |
Switchable pulse-echo or pitch-catch |
RECEIVER - 8 separate receiver amplifiers are provided.
One receiver may " listen" on each rep. |
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Common Receiver Controls,
Specifications and Outputs |
Tuned Frequencies |
1, 2.25, 5, 10, 15 MHz |
Wideband
Bandwidths |
1-20, 3-20, 5-20, 5-20 MHz |
Gain |
Adjustable -30 to +80.0 dB in 0.1 dB steps |
Display Output |
Switchable RF, Detected RF |
Detected RF
Presentation |
+, -, ±, Hi Res ± |
Reject |
Linear reject adjustable 0-80% f.s. |
Individual Controls |
Gain |
Adjustable 0 to 60 dB below common gain in 0.1 dB
steps |
Equivalent
Input Noise |
25 μvolts rms, wideband |
Channel Isolation |
60 dB or better |
AMPLITUDE GATE |
16 separate gate channels are provided. The
results of any rep (peak detected output and alarm condition) may be
applied to any of the 16 gate channels. |
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Common Gate Controls,
Specifications and Outputs |
On |
Toggles all the gates on or off |
Velocity |
Used to generate gate position readings,
adjustable
from 0.05 to 0.3 inches/μsec. |
Detector
Output Hold |
Selectable 0 - 1000 milliseconds or reps |
Alarm Output Hold |
Selectable 0 - 1000 milliseconds or reps & external
clear |
Individual Gate Controls |
Alarm Noise Filter |
Adjustable 1 - 15 |
Alarm Polarity |
Selectable Hi/Lo |
Mode |
Selectable, Normal or Interface gate with adjustable
blanking |
Detector Output |
10 volts analog, 8 bits digital |
Alarm Outputs |
TTL level compatible, "Hi" on alarm &
no-test |
Alarm Indicators |
Visual and audible |
Cyclic Rep Controls Adjustable
for each rep individually |
Blanking Interval |
Adjustable .05 - 1000 μsec. (.006
- 112 inches steel) |
Delay Interval |
Adjustable .05 - 1000 μsec. (.006
- 112 inches steel) |
Gate Interval |
Adjustable .05 - 1000 μsec. (.006
- 112 inches steel) |
Alarm Level |
Adjustable 0 - 100% |
RS-232 Serial |
9.6 kBaud, Allows software control of the functions
and
cyclic operation of a single XU-2248 |
RS-485 High Speed
Serial (2 channels)
Command
Link |
Selectable 9.6, 62.5, 100, 250 kBaud, Allows control
of the functions,
cyclic operation and high speed data acquisition for
single or
multiple 2200 Series instrument. |
COMPUTER INTERFACE (cont.) |
Data Link |
Gate Amplitude.
1 MBaud transmission rate with
external synchronous data clock.
Allows high speed data acquisition on
each rep.
Optimized for use with the Xactex XT-3032 RS-485 Serial
Interface Board. |
Isolated Parallel |
Outputs parallel 8-bit data |
Software |
IBM PC compatible, MS DOS 3.1 or higher. Included is
"UTQWIK", a program
that allows operation of the instrument over
the serial links from a PC.
The program also provides for storage and
recall of instrument setups on
disk.
A Microsoft C compatible "object
file" is also included.
This "driver" supplies all the
command codes for the XU-2248 and simplifies
embedding
UT instrument
control and data acquisition within user-generated custom
software. |
AC Input |
85-264 VAC, 47 to 63 Hz |
Power Consumption |
60 Watts |
Size |
Nominally 10 1/4" (W) x 7
3/4" (H) x 16 1/2" (D) |
Size (1/2 rack unit) |
Nominally 9" (W) x 7 1/4" (H)
x 16 (D) |
Weight |
Less than 22 lbs |
Weight (1/2 rack unit) |
Less than 15 lbs |
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