TECHNICAL MANUAL ULTRASONIC TEST SET MODEL 42A12D JUNE 15, 1998 REV 00 SEACOM DIVISION DUKANE CORPORATION ST. CHARLES, ILLINOIS 60174 PHONE: 630/584-2300 FAX: 630/584-5154 DOCUMENT NO.
Table Of Contents SECTION I General Information....................................................................................................... 1.1. Introduction.................................................................................................... 1.1.1. General............................................................................................. 1.1.2. Symbols and Abbreviations........................................................... 1.2. General Description...................
SECTION I GENERAL INFORMATION 1.1. INTRODUCTION 1.2.2. SPECIFICATIONS. The specifications for the 42A12D are given in Table 1.1. 1.1.1. GENERAL. This manual contains the description, operation and maintenance of the 42A12D Ultrasonic Test Set manufactured by Dukane Corporation, Seacom Division, 2900 Dukane Drive, St. Charles, Illinois 60174. See Figure 1.1. 1.1.2. SYMBOLS AND ABBREVIATIONS. All symbols and abbreviations used in this manual are in accordance with the ANSI Y14.
Figure 1.2. Test Set Block Diagram. 1.2.3. BLOCK DIAGRAM. Figure 1.2. is a block diagram and Figure 3.1. is the schematic diagram of the test set. The microphone detects a beacon signal which is amplified and fed into the mixer. The tunable oscillator frequency is also fed into the mixer. When tuned above or below the incoming signal, the difference frequency is the resultant output from the mixer, and will be in the audio range when the difference is within 1000 to 3000 Hz.
SECTION II OPERATION 2.1. OPERATION A. Turn the GAIN control to a fully clockwise position. A pronounced background noise should be present. Lack of noise may indicate a dead battery. Should this occur, replace battery before resuming operational testing. See Maintenance Section 3.2. B. Set the TUNING control to approximately midscale. Rubbing fingers in front of microphone should produce a rushing noise from speaker. C.
SECTION III MAINTENANCE 3.1. BATTERY LIFE With intermittent usage, battery operating life will be approximately 30 to 40 hours depending on the type of and manufacturer of the battery. In any event, battery should be replaced when its load voltage has dropped to 7 volts (Test Set turned ON and GAIN control set to minimum). 3.2. BATTERY REPLACEMENT 3.3.2. TUNING A. Turn the GAIN control to OFF, loosen the screw on the back of the case and remove the test set from the housing.
3.4. TEST SET SCHEMATIC DIAGRAM. 3.3.3. ADJUSTING FREQUENCY RANGE. A. The frequency range for the Test Set is 30 to 45 kHz. The audio output is tuned for approximately 3200 Hz. Figure 3.2. is the schematic diagram for the 42A12D Ultrasonic Test Set. B. Set the TUNING knob to the maximum frequency (45 kHz). Place an oscilloscope probe or frequency counter on the output of the local oscillator circuit, pin 14 of U2. See Figure 3.3. 3.5. MAINTENANCE AND REPLACEMENT PARTS. A. Tuning or Gain 1 control knob..
