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Summary of Contents for ST CAYMAN 401
- Page 1 PORTABLE NONLINEAR JUNCTION DETECTOR ST 401 ‘CAYMAN’ OPERATING MANUAL English...
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Page 2: Table Of Contents
OPERATING MANUAL CONTENTS 1. Description 1.1. Purpose 1.2. Delivery Package 1.3. Technical Specifications 1.4. Principles of Operation 1.5. Operation Modes 1.6. Structure 1.6.1. Antenna Module 1.6.2. Main Unit 2. Use 2.1. Preparation 2.2. Adaptive Mode 2.3. Operational check with test dummies 2.4. -
Page 3: Description
• any other devices utilising semiconductor technology ST 401 allows detecting electronic devices, whether active or not, as well as finding their exact location. It also enables one to distinguish between return signals from real semiconductors and other kinds of responses, such as those given by corrosion or metal-oxide- metal structures. -
Page 4: Technical Specifications
OPERATING MANUAL 1.3. Technical Specifications Range of radiated frequencies 2–3GHz Max. peak radiated power < 2W Antenna polarisation elliptic Operation modes SEARCH, AUDIO, ADAPT Sensitivity range in manual mode 40dB (5 values with 8dB increment) Visual indication three 16-segment gauges Aural indication internal speaker or headphones Power supply... -
Page 5: Principles Of Operation
ST 401 ‘CAYMAN’ NLJD 1.4. Principles of Operation ST 401 ‘Cayman’ is a nonlinear junction detector, or NLJD. Instruments of this type employ active detection, i.e. they emit probing signals and analyse the return. Their primary search targets are electronic devices, and those typically consist of circuit plates with conductive elements and various semiconductor parts connected to them, such as diodes, transistors, and microchips. -
Page 6: Structure
OPERATING MANUAL 1.6. Structure Structurally, the ST 401 ‘Cayman’ NLJD consists of the antenna module and the main unit connected by way of a hinge joint. The general appearance of ST401 is shown in Fig. 2, the numbers standing for: 1 –... - Page 7 ST 401 ‘CAYMAN’ NLJD Fig. 4 On the surface of antenna facing operator, there are an indicator panel, a socket for the power- and-control cable, and a USB port for computer connection (Fig. 4). The numbers in Fig. 4 stand for the following:...
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Page 8: Main Unit
Fig. 5 1.6.2. Main Unit The main unit of ST 401 ‘Cayman’ consists of a battery compartment, a control panel, and mechanical parts that form the bearing structure. The appearance of the main unit and the location of its components are shown in Fig. 6. -
Page 9: Use
ST 401 ‘CAYMAN’ NLJD A three-button control panel is located in the upper part (Fig. 7). The MODE button (1, Fig. 7) is used to set the operation mode of the device. A short press of this button alternates between SEARCH and AUDIO;... -
Page 10: Adaptive Mode
OPERATING MANUAL Make sure the power switch (5, Fig. 6) is in its leftmost position (OFF). Insert the power-and- control cord plug (3, Fig. 6) into the socket (8, Fig. 4) on the antenna module. Activate the device by rotating the knob clockwise. The device status will be displayed on the antenna module as shown in Table 1 below. -
Page 11: Manual Gain Control
If both distances exceed the required minimums, the device is functional and operation-ready. 2.4. Manual Gain Control Once ST 401 has been prepared and proven functional as described above in 2.1 – 2.3, it can be put to use. When activated, the device starts up in SEARCH mode, and the receiver gain is by default set to maximum, which is displayed by 5 lit segments of the TUNING indicator. - Page 12 OPERATING MANUAL When running checks on enclosing structures, it is important to set a suitable receiver gain. If excessive, it may well cause detection of objects behind the walls, which may be a problem when there is no access into the adjoining spaces. On the other hand, if the gain is too small, targets of interest with a weak response may remain undiscovered in the structure under scrutiny.
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Page 13: Listening (Audio Mode)
*Upon switching to AUDIO, none of the TUNING bar segments are lit, which corresponds to #0 frequency combination. The ST 401 allows listening to demodulated signals while probing with six different frequency combinations. Each combination, indicated by LEDs on the TUNING bar, is suited to deal with a particular category of nonlinear objects. - Page 14 OPERATING MANUAL Table 3 Indication on TUNING bar Frequency combination # Gauge bar # in SEARCH mode Use buttons to change probing frequency combinations (2 and 3, Fig. 7). Table 4 shows typical results of analysing targets with nonlinear properties. Table 4 Sounds when Sounds in the...
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Page 15: Power Supply
Push the MODE button to switch from the AUDIO mode to SEARCH. 3. POWER SUPPLY ST 401 Cayman is powered by two Li-ion rechargeable batteries (type 18650). 4 batteries are included in the delivery package. The total run time on one battery charge is from 3 to 4 hours, depending on the modes employed;... -
Page 16: Operating Restrictions
OPERATING MANUAL 4. OPERATING RESTRICTIONS Use of the device is subject to safety regulations for equipment incorporating UHF transmitters. The following must be observed at all times: • Avoid long exposure of people to the antenna beam (the main lobe of the polar diagram) at distances less than 1m.
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