XLT-30 Acoustical Leak Detector Operating Manual FISHER RESEARCH LABORATORY
CONTENTS Introduction ........................................................................... pg. 1 Instrument Set ....................................................................... pg. 2 Faceplate & Control Panel ................................................. pg. 4 Operating Instructions ........................................................ pg. 6 Specifications......................................................................... pg.
INTRODUCTION Fisher Research Laboratory has always been a leader in the field of acoustical leak detection. From the early LT-10 through the XLT-20, high quality sound amplification has been synonymous with the name Fisher. Fishers XLT-30 takes leak detection to a new level. Ultra sensitive sound microphones, combined with a non-distortion amplification system and crystal clear audio headphones make the XLT-30 the leak detector destined to set new standards for the leak professional.
INSTRUMENT SET 1. Control Box All listening and filtering controls for the XLT-30 are contained in this sturdy housing. The function of each control is described in the section entitled “Faceplate and Controls”. 2. Big Foot Probe Also known as the Ground Microphone, this probe is to be used on hard surfaces, concrete, asphalt, tile, etc. A flexible rubber shield helps prevent outside sounds from interfering with the sounds from the buried pipe.
INSTRUMENT SET On top of the Cylinder Probe is a three position toggle switch for Mute, Listen, and Momentary Listen. As with all Mute controls, learn to use them wisely. When tightening the sounds rods to the Hydrophonic Probe, secure the connector with a wrench as to not let it twist. Twisting of that connector could damage wiring on the inside of the probe. 4. Sound Rods Two different sizes are included with the XLT-30.
CONTROL PANEL POWER This pad turns the XLT-30 On or Off. When the instrument is turned Off, all settings, or modifications to settings default to the preset factory settings. LIGHT Depress pad to turn the back light On or Off. Prolonged use of the Back Light will have minimal effect on the battery life of the XLT-30. VOLUME Depress pad to modify the Volume of the XLT-30. The arrow keys (Up arrow/Down arrow) increase or decrease the Volume to the headphones.
CONTROL PANEL (The following filter modes have a frequency range from 60 Hz to 2.4 kHz) HI (High Range) – This filtering mode allows the user to adjust the response in the higher areas of the frequency range. Use the Arrow keys to increase or decrease this frequency response range. LO (Low Range) – Similar to the previous filter mode, the Low Pass filter allows the user to listen to the lower areas of the frequency range. The Arrow keys are used to increase or decrease this frequency response range.
OPERATING INSTRUCTIONS Set Up 1. Assemble Control Housing, Headset, and your choice of listening probe . The headset must be plugged in for the XLT-30 to operate. 2. Depress POWER pad to turn On the XLT-30. The XLT-30 goes through a five second warm up before the touch pads are functional. During this time, the Display Screen gives information of Battery Level. A reading of 68 or below will activate the “Low Battery” indicator.
OPERATING INSTRUCTIONS Use of the Notch Filter Occasionally, you may come across a sound that may be masking or covering your ability to adequately hear any leaks. This may be caused by nearby motors, fans, or many other annoyances. (Unfortunately, the most common are sounds caused by automobiles and traffic). The XLT-30 has a Notch, or reject feature, that will assist in eliminating that sound from your frequency range.
SPECIFICATIONS Subject to improvement or modification without notice. Operating frequency Range All pass mode 60Hz - 6kHz Filter mode 60Hz - 2.4kHz Filter Types: Independent notch filter Lowpass, Highpass or Bandpass Gain 95dB Output Indications: Audio High performance headphones (64 ohms) Visual LCD bargraph and 2-digit numeric display Battery Test Automatic Battery Type Two 9 Volt alkaline Battery Life 50 Hours (approximate) Weight Housing 1.2 lbs. Bigfoot Sensor 4.5 lbs.
QUALITY Fisher detectors are renowned for their quality. Each detector is hand crafted in the USA with pride PERFORMANCE The worldwide underground utility industry relys on Fisher. Our instruments are durable, dependable, and search deeper.. REPUTATION Fisher produced the first patented metal detector in 1931. For over 70 years, the Fisher logo has been a mark of excellence.
