2047U/C MKII

The 2047U/C MKII combines the features of the 4020 standard stethoscope with those of an ultrasonic (sounds higher in frequency than the ear can hear... 35 to 45 Kilohertz or KHz) detector.  Many watches and clocks generate a considerable amount of ultrasonic energy that will travel a great distance if unobstructed.  If the watch or clock can be "seen" by the ultrasonic probe, detection ranges on the order of 1 to 20 feet are not uncommon.  The ultrasonic probe is highly directional and effectively tunes out background noise.  The 2047U/C can also detect many types of gas enhanced IEDDs. The system consists of an amplifier/detector assembly, contact probe, ultrasonic probe and headset.

Insert the contact probe into the CONTACT PROBE jack.   NOTE: There are three (3) jacks of the same physical type on the unit, be careful not to confuse one with the other.   Place the YELLOW switch in the CONTACT-DOWN position.  Insert the headset supplied into the HEADSET jack.  Do NOT use low impedance headsets (8 to 32 ohm)... the unit simply will not work with them.   Place the probe firmly on the desired surface and adjust the VOLUME accordingly.

Screw the ultrasonic probe (BLUE) onto the ULTRASONIC PROBE connector.  Make sure the connection is firm but not over-tightened.   Place the YELLOW switch in the ULTRASONIC-UP position.  Point the open end of the probe at a mechanical clock or watch (source of ultrasonic sound) and adjust the VOLUME.  Bear in mind that ultrasonic energy will travel considerable distances if unobstructed.   A single sheet of paper, for example, will effectively block ultrasonic energy from reaching the probe.  The ultrasonic probe may also be tested by having someone stand 20 to 30 feet away from the probe and tear a sheet of paper.   The sound should be heard clearly.

The unit has a RECORDER output jack that provides line level audio into 10,000 ohms.  This jack is run, using a mini-plug to mini-plug cable, to the AUX (AUXILIARY) input on a tape recorder.   If the recorder does NOT have an AUX jack it is necessary to use a 100:1 attenuating cable.  The attenuator cable is then plugged into the MIC or MICROPHONE jack on the recorder.

A single 9 volt Alkaline battery powers the 2047U/C and provides approximately of 70 hours ON time.  To replace the battery, loosen the two silver screws on the sides of the unit one or two turns.  Carefully lift off the back cover, remove the old battery (noting its position), replace it with a fresh Alkaline battery and replace the back cover.  Be careful not to pinch the battery connector leads with the back cover.  Tighten the two screws but do not over-tighten.  As with any piece of sophisticated electronic equipment, do not store in extreme heat or humidity.

NOTE: Television sets generate frequencies that fall within the detection range of the ultrasonic probe, therefore, do not operate the 2047U/C closer than 100 feet from an operating TV set, monitor, or computer display.

As with any piece of electronic equipment, remove the batteries during periods of prolonged storage.