ENGINEERING DESIGN SPECIFICATION RT30™ WIRELESS AC LINE POWER DETECTOR Document No. EX-0031-380-A-1-B 4 January 2008 Bruce A. Wahler THIS DOCUMENT CONTAINS PROPRIETARY AND CONFIDENTIAL INFORMATION INTENDED ONLY FOR LIMITED DISTRIBUTION WITHIN EXTECH INSTRUMENTS AND ITS DESIGNEES. IT SHALL NOT BE REPRODUCED OR TRANSFERRED TO OTHER DOCUMENTS OR DISCLOSED TO OTHERS OR USED FOR ANY PURPOSE OTHER THAN THAT FOR WHICH IT WAS OBTAINED WITHOUT THE EXPRESSED WRITTEN CONSENT OF EXTECH INSTRUMENTS.
RT30™ Engineering Design Specification Page ii of 20 TABLE OF CONTENTS 1.0 1.1 1.2 2.0 2.1 3.0 3.1 3.2 4.0 EXECUTIVE SUMMARY.............................................................................................................................. 4 OVERVIEW .................................................................................................................................................. 4 MODEL COMPARISON .................................................................................
RT30™ Engineering Design Specification 8.0 8.1 8.2 8.3 8.4 8.5 9.0 9.1 9.2 9.3 10.0 Page iii of 20 MISCELLANEOUS SPECIFICATIONS ..................................................................................................... 17 DROP TEST............................................................................................................................................... 17 RESISTANCE TO CONTAMINATION ............................................................................................
RT30™ Engineering Design Specification Page 4 of 20 1.0 EXECUTIVE SUMMARY 1.1 OVERVIEW The RT30™ is a medium-range wireless AC voltage detector system, designed to use either direct non-contact voltage (NCV) measurement of an AC line, using the built-in cable clamp or an external clamp probe; or to detect the light output of a lamp connected to the tested line through a light-detecting resistor (LDR), in cases where the wiring is inaccessible.
RT30™ Engineering Design Specification 3.0 Page 5 of 20 SYSTEM ARCHITECTURE The RT30 system consists of three (3) parts: 1) a Transmitter Unit (TU) with integrated clip-on non-contact voltage (NCV) detector and light detector; 2) a wireless Receiver Unit (RU); and 3) an optional External Probe with integrated NCV detector. 3.1 FINDING A LIVE CIRCUIT BY VOLTAGE The RT30 can be directly clamped on installed building wiring, as shown in Figure 1, and will detect the voltage applied to the wiring.
RT30™ Engineering Design Specification Page 6 of 20 4.0 SYSTEM SPECIFICATIONS 4.1 GENERAL SPECIFICATIONS Transmitter Unit Display Controls Receiver Unit Power, Detect, External Probe LEDs Power, Detect, Communications LEDs 3-position slide switch 3-position slide switch Momentary switch for aux. functions NCV: 2,000 samples/sec. Sample Rate n/a LDR: 4 samples/sec. External Probe: 2,000 samples/sec. Transmission Frequencies EU Version: 868.4MHz, 869.0MHz, 869.6MHz NA Version: 913.4MHz, 914.
RT30™ Engineering Design Specification 4.2 BASIC OVERVIEW 4.2.1 Transmitter Unit Page 7 of 20 The Transmitter Unit is shown in Figure 3.
RT30™ Engineering Design Specification Page 8 of 20 Figure 4 – Receiver Unit 4.2.3 External Probe An optional External Probe can be used to clamp onto tested wiring. The probe is shown in Figure 5. Using the External Probe is exactly like using the NCV Channel. When the External Probe is plugged in, the External Probe LED shall indicate its use. Note: Use of the External Probe overrides the setting of the Power/Mode Switch. Light Mode cannot be used while the External Probe is attached.
RT30™ Engineering Design Specification 5.1.
RT30™ Engineering Design Specification 5.1.
RT30™ Engineering Design Specification 5.2 Page 11 of 20 RF SYSTEM CONTROLLER The RT30 shall use the Nordic Semiconductor nRF905 for both the TU and RU RF system controllers. The nRF905 was chosen for its combination of low power operation, minimal overhead, and system flexibility.
RT30™ Engineering Design Specification 5.2.2.1 Page 12 of 20 Device Address The working address for all RT30 devices shall be 45583730h (‘EX30’ ASCII). 5.2.2.2 Supported Commands While the RT30 shall accept all commands defined in the Inter-Module RF Communications specification without system failure, the TU shall only send, and the RU shall only act upon, the following commands: • Alarm Status • Hello • Beep Code • Comm Channel Change 5.3 SWITCHES 5.3.
RT30™ Engineering Design Specification 5.4 INDICATORS 5.4.1 TU Indicators Page 13 of 20 The TU has two LED indicators: • Power LED (Green) – This indicator shows that the TU is operating, and has battery power. • Detect LED (Amber) – This indicator shows that the TU has detected voltage (when in NCV or External Mode) or a light level change (when in Light Mode). 5.4.
RT30™ Engineering Design Specification Page 14 of 20 5.5 FIRMWARE CONTROL SEQUENCES 5.5.1 Calibrating the Light Meter (TU) On power-up, the TU shall assume that the ambient light level is a “no alarm” condition. If the TU is powered on in a brightly-lit room, it shall assume less light is an alarm condition; if it is powered on in a dark room, it shall assume more light is an alarm.
RT30™ Engineering Design Specification Ex: Page 15 of 20 TU is on CH3. RU #1 is on CH2. RU #2 is on CH1. 1. Press the Calibrate/Channel Switch for 5 seconds. 2. RU #1 and #2 both beep three times. All devices are now on CH3, and the Communication LEDs are lit. 3. Press the Calibrate/Channel Switch for 0.5 second. 4. RU #1 and #2 both beep once. All devices are now on CH1. 5. Press the Calibrate/Channel Switch for 0.5 second. 6. RU #1 and #2 both beep twice. All devices are now on CH2. 7.
RT30™ Engineering Design Specification 6.0 POWER 6.1 BATTERIES Page 16 of 20 Both the TU and RU shall use standard ‘AAA’ batteries (MN2400 or equivalent). The battery compartments shall be accessible through a battery door with a Philips-head locking screw. There shall be adequate markings on the case and/or PC board to denote the polarity of each battery, as shown in Figure 6.
RT30™ Engineering Design Specification Page 17 of 20 7.0 EXTERNAL CONNECTORS 7.1 EXTERNAL PROBE CONNECTOR The External Probe Connector shall be a standard RJ45-8 unshielded connector, without indicators.
RT30™ Engineering Design Specification 8.3 Page 18 of 20 COLOR The RT30 shall be molded in the standard Extech colors of Pantone 021 Orange and Pantone 3435 Green. Color matching shall be approved by Extech Engineering. 8.4 SERIAL NUMBERING The RT30 TU and RU shall each have a (physical) external serial number label on the back side of the case. Details of the label are TBD. 8.
RT30™ Engineering Design Specification 9.3 Page 19 of 20 RF TRANSMITTER The following low-power RF transmission approvals shall be obtained: • • FCC CFR 47, Part 15 10.
RT30™ Engineering Design Specification Rev A Page 20 of 20 APPENDIX A – APPLICABLE AGENCY STANDARDS The following national and international standards apply to this product. Document Country Description ANSI C63.4 – 1992 USA "American National Standard for Methods of Measurement of Radio-Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz", American National Standards Institute (ANSI), 1992. C.I.S.P.R. Pub.
