SPECIFICATION (PRELIMINARY) 
| GENERAL DATA |
Mobile equipment |
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Supply voltage
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220 V +/- 10 %, 50 Hz
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Supply fuse
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6 A
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Ambient temp.
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0 to +40 degrees Celsius
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Electronic cabinet (one channel)
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600 x 600 x 350
(w x h x d)
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Case size
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19"
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Degree of protection
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IP 44
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Components
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Common industrial types
(no special)
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PERFORMANCE AND RELATIONSHIPS*
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Minimum detectable crack depth
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DJspr: GK / 50 mm
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Minimum detectable crack length
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Lspr: GK / 1,5 mm
(100% surface scanning)
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Minimum detectable surface hole diam
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Dh: GK / 12 mm
(hole depth = GK / 1)
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Minimum detectable sliver (flake) depth
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DJsl: < GK / 80 mm
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Maximum allowed surface structure
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PFp-p: GK / 40 mm
(sinusoidal function)
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Maximum allowed lift-off (free air)
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LO: GK / 2 mm
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Current penetration depth (approx)
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DIH: GK / 25 mm
(for max carrier frequency)
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Carrier frequency
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RF: f(DIH) **
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* Expected result and limitations for DELTATEST
can easily and approximately be calculated
by a sensor constant named GK, with a signal/nois ratio, S/ N > 3.
GK is a unlinear function of sensor dimensions.
GK = 0,5 to 50
First step : Choose suitable value (0,5 - 50) for GK,
and then, calculate current function.
**
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MEASURING UNIT |
Standard performance
(One channel)
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Number of units
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One unit per channel/sensorcoil
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Dimension, racket
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19" (w) x 133 mm (h)
x 250 mm (d)
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Printed circuits board (PCB)
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14 pieces, single europe card
(100 x 160 mm)
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Basic measuring Principles
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Frequency conversion,
Vectortransformation
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Frequency generation
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Crystal-controlled digital frequency synthesizer
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Carrier / Operating frequencies, RF
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1 - 64 MHZ
(function of DIH)
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Conversion
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Single (other on request)
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Intermediate frequency, IF
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62,5 - 500 KHZ
(standard IF = 250 KHZ)
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Signal execution time / crack, Tc
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< 2ms
(unit ready to serve next crack)
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Reset after Tc
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Automatic, high speed
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Input impedance, Zin
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50 ohm
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Common-mode rejection
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On request (very high)
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Mixer
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Doubly balanced modulator
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Synchronous detectors
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Doubly balanced demodulator
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Selectivity
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On request (> 10 times better than conventional systems)
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Sensitivity
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Please, see at performance
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Phase setting
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Switches on PCB or panel
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Sensitivity setting
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Potentiometers on panel
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Vector setting
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Potentiometers on PCB or panel
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Balancing (BAL)
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Automatic
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Blocking (BL)
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Blocking function
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Digital input signal, BAL
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BAL, active
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Digital input signal, BL
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BL, active
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Digital output signal DFP
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Delayed crack signal or relay contact (10 ms - 1 s)
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Analogous output signal, CS
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Crack Signal
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Alarm
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LED indicator for unbalans alarm
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OPTIONAL SIGNALS
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Separate cabinet
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Digital output signal, SB
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Strobe / order signal (CBC)
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Digital output signals, CBC
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Crack depth Binary Code
(4 to 6 bit)
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Digital output signal, CO
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Crack Overflow
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Digital input signal, RC
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Receipt, Crack registration
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ROTATING SENSOR
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Standard performance incl preamplifier
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Detected defects
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Surface- cracks, holes, slivers etc
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Detected cracks
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Longitudinal and transversal
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Allowed crack orientation
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All (no restrictions)
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Surface scanning pattern
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On request
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Allowed lift-off
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GK / 2
(Please see PERFORMANCE)
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Preamplifier
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Balanced
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Preamplifier output impedance Zout
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50 ohm
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Signal transmission
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Inductive (no galvanic contact)
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Energy transmission
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Inductive (no galvanic contact)
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Crackdepht indicator
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LED scale, 10 piece
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Connectors
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BNC
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Cable type
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Coax, RG 58
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Cable length, sensor - measuring unite
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4 m (other on request)
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OPTIONAL PERFORMANCE
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Frequency Difference Measuring
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FD
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Phase Discrimination, Product-Quotient
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PD-PQ
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Phase Discrimination, Phase-Expansion
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PD-PE
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Dynamic Transformation
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DT
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Lift-Off-Compensation
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LOC
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Queue Function
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QF
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Please, see SENSORS for more information.
 Expected performance, Examples
Download as World-document (ca 31K)
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