Size: 9.25 x 7.13 x 4.0 in (235 x 181 x 102mm) Weight: 7.5lbs. (3,4Kgs) with Li-Ion cells. Case: Extruded Aluminum. Display: Transflective TFT Color. Display area: 4.39” x 3.29” (111.4 x 83.5mm) 320 x 240 pixels. A-Scan area: 255 x 200 pixels (315 x 200 expanded), 8 color options and variable brightness. Temperature: Operating –10 to +55°C or 14 to 131°F –20 to +70°C or –4 to 158°F (survivable) Storage –40 to +75°C or –40 to 167°F Environmental: Meets IP65 requirements. Units: English (in), Metric (mm), or Time (µs). Probe Zero: 0–999.999 µs. Velocity: 615 & 625 0.0393 to 0.3937 in/µs (1000–9999m/s). 635 & 638 0.0100 in/µs (256 to 16000 m/s. Test Range: 615 & 625 0 - 0.2in (5mm) up to 0 - 400in (10,000mm) at steel velocity. Variable in sequence, 0.4in or 0.04in (10mm or 1mm). 635 & 638 0 - 0.05in (1mm) up to 0 - 800in (20,000mm) at steel velocity. Variable in 1, 2, 5 sequence or continuously in 0.05in (1mm) increments. Also from 1 to 5000(µs). Test Modes: Pulse-echo and transmit/receive. Gates: 615 & 625 Start & Width adjustable over full range. Amplitude 0 -100%, 0.5% steps. Visual & audible alarms. Single gate positive trigger, and two gates positive and negative triggering. Gate 2 has selectable 0.6 second delay on alarm. 635 & 638 Two fully independent gates with positive and negative triggering for each gate. Gate Expansion: 635 & 638 Expands range to width of Gate 1. Gate Monitor Delay: 635 & 638 Selectable 0.6 sec delay on gate 2 negative monitor. Measurement Modes:
Signal Monitor - 635 & 638.
Depth - Depth and amplitude of signal in gate.
Echo Echo - Echo-Echo distance, automatic gate 2 position.
Gate to Gate - 625 Echo-Echo , manual gate 2 position. 635 & 638 independent gates.
Trig - Trigonometric display of beam path, depth and surface distance. Calculation of skip depth and curve surface compensation, X-offset for transducer.
T-Min - Holds minimum thickness in depth mode. System Linearity: Vertical = 1% Full Screen Height (FSH) Amplifier Accuracy ±0.1%dB. Horizontal ±0.4% Full Screen Width (FSW). Pulser Voltage: 615 & 625 200 volt peak amplitude, rise/fall time < 10ns into 50ohm. 635 & 638 100V - 350V (450V 638 ) square wave pulser. Pulse width from spike to 2000ns duration - rise/fall times < 5ns into 50 ohms. Pulser Width: 615 fixed at 100ns. 625 30-250ns linked to filter band. 635 & 638 Adjustable in 2% of nominal width, minimum 1ns maximum 40ns. ActiveEdge: Unique active pulse control for enhanced near surface resolution and signal response. Replaces traditional damping control. P.R.F.: 615 & 625 Selectable 35 to 1000Hz (635 & 638 5000Hz), 5Hz steps. Screen Update Rate: 50 or 60Hz. Rectification: Full wave, positive or negative half wave and unrectified RF. Delay: 615 & 625 0 - 400 in (10,000mm) 635 & 638 0 - 800in (20,000mm) at steel velocity in 0.02 steps (0.05mm). Gain: 0 to 110dB. Adjustable in 0.5, 2, 6, 14 and 20dB steps. Frequency Bands: 615 4Broadband 1 - 10 MHz (-6dB). 625 4 Narrow Bands centered at 1MHz, 2MHz, 5MHz, & broadband 1.5–15MHz. 635 & 638 6 narrow bands centered at 0.5, 1, 2.25, 5, 10 & 15 MHz. Broad band at 2 to 22 MHz (-6dB) and 1 to 35 MHz (-20dB). Vertical Linearity: 1% full screen height. Amplifier Linearity: +/- 0.1 dB. Horizontal Linearity: +/- 0.4% full screen width (FSW). Reject: 615 & 625 50% suppressive reject. LED warning when selected. 635 & 638 80% linear reject. Thickness Logging: Storage for 8000 readings stored in Block/Location/Number coding or alpha-numeric pre-programmed work sheets. Transferable to Excel using optional PC software. Panel Memory: 100 storage locations for calibration settings. A-Scan Memory: 800 waveforms. Wave Smoothing: Produces a smooth signal envelope. AGC: Automatic Gain Control sets selected echo to a user defined level (10 - 90%). DAC: Up to 10 points may be entered and used to digitally draw a DAC curve. Reference -2, -6, -10, -12, -14 dB curves can be selected for JIS, ASME and EN1714 codes. AWS: Automatic defect sizing in accordance with AWS D1.1 Structural Welding Code. API: Automatic defect sizing in accordance with API 5UE. AVG/DGS: Automatic defect sizing using probe data. 10 probe data sets can be stored. TCG: 625, 635 & 638 Time corrected gain. 40 dB dynamic range, 30 dB per microsecond, up to 10 points for curve definition. Auto-Cal: Provides Automatic calibration with two echoes. Reference Waveform: Recalled waveform can be shown in a different color to live waveform for direct comparision. Display Freeze: Hold current waveform on screen. Peak Memory: For echodynamic pattern determination. Online Help: Instant operator guidance on operation accessed from direct key. Language Support: Six user selectable languages from: English, German, French, Spanish, Dutch, Italian, Russian, Polish, Czech, Finnish & Hungarian. Others available on request. Battery: Lithium Ion battery pack 14.4V, 5.0 Amp hrs. Minimum 11 hours use, typical 15 hours, indication of battery charge. Recharge time 4 hours. Charger: 100 - 240 VAC, 50 - 60Hz. USB Connection: For connection to PC, keyboard and printer. Outputs: Serial Interface, composite video (NTSC & PAL), analog output for amplitude and distance updated at PRF rate. Transmitter sync output. Transducer Connectors: available with BNC or LEMO 1 connectors (factory option). Warranty: 2 year limited
Additional 638 Features
Interface trigger: Interface gate locks to surface echo and eliminates water path variation. High Power Pulser: 450 volt boost. | 
