CS135 Ceilometer User Guide Issued 18.3.13 Copyright © 2012-2013 Campbell Scientific Ltd.
Guarantee This equipment is guaranteed against defects in materials and workmanship. This guarantee applies for twelve months from date of delivery. We will repair or replace products which prove to be defective during the guarantee period provided they are returned to us prepaid.
PLEASE READ FIRST About this manual Some useful conversion factors: Area: 1 in2 (square inch) = 645 mm2 Length: 1 in. (inch) = 25.4 mm 1 ft (foot) = 304.8 mm 1 yard = 0.914 m 1 mile = 1.609 km Mass: 1 oz. (ounce) = 28.35 g 1 lb (pound weight) = 0.454 kg Pressure: 1 psi (lb/in2) = 68.95 mb Volume: 1 UK pint = 568.3 ml 1 UK gallon = 4.546 litres 1 US gallon = 3.
Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab for links to specific sections. Section 1. General Information ...................................... 1 1.1 1.2 1.3 1.4 1.5 Manual Version .......................................................................................... 1 General Safety ............................................................................................ 1 Sensor Unit Safety....................
5.3 LED Indicator ......................................................................................... 29 Section 6. Messages ..................................................... 30 6.1 6.2 6.3 6.4 Data Messages General .......................................................................... 30 CS Messages ........................................................................................... 30 CL31 Messages .....................................................................................
CS135 Ceilometer 1. General Information 1.1 Manual Version Table 1.1 Manual revisions Manual Version 1.0 Applicable to Operating System OS1 2.0 Applicable to Operating System OS2, Top Board OS2, PSU OS1 3.0 Applicable to Operating System OS3, Top Board OS2, PSU OS1 4.0 Applicable to Operating System OS6, Top Board OS5, PSU OS1 Revisions N/A 1.2 General Safety This manual provides important safety considerations for the installation, operation and maintenance of the CS135.
CS135 Ceilometer CAUTION Ensure that the correct voltage supply is provided to the sensor. 1.4 Laser Safety The CS135 sensor incorporates a laser diode which is rated as a class 3B device. This is an embedded laser where the output from the sensor unit, through the optics, is minimised to class 1M. This classification indicates that viewing of the beam with the naked eye is safe but looking directly into the beam with optical instruments, e.g. binoculars can be dangerous.
User Guide NOTE WARNING The unit should only be serviced by trained personnel. Removal of electronic module covers or connectors while the unit is powered will expose the operator to potentially hazardous voltages and risk damage to the sensor. 2. Product Overview Fig 2.
CS135 Ceilometer 2.1 Introduction The CS135 is a LIDAR (LIght Detection And Ranging). It emits short pulses of near infra-red light into the atmosphere from a semiconductor laser. These are scattered back by aerosols including cloud droplets. The time between transmission of the pulse and the return signal gives the range, and therefore height, of the scattering aerosols.
User Guide The control system of the CS135 is divided into three modules, DSP, TOP and PSU as follows:DSP is the main data processing and communications unit of the CS135. TOP provides a number of safety shutdown features such as over and under laser output level. It also contains the calibration circuitry and dirty windows system. PSU controls the power supply, including battery charging and deep discharge protection.
CS135 Ceilometer 2.4 Specifications 2.4.1 Measurement Specifications Maximum Reporting Range: 10 km / 32,800 ft Minimum Reporting Resolution: 5 m / 15 ft Hard Target Range Accuracy: +/- 0.25% +/- 4.6 m Reporting Cycle: 2 to 120s Cloud Layers Reported: Up to four layers reported, user selectable 2.4.2 Mechanical Specifications Height: 1000 mm Width: 330 mm Depth: 316 mm Total weight: 33 kg (excluding cables) Packed weight: 58 kg 2.4.
User Guide 2.4.4 Optical Specifications Pulse duration: 100 ns Pulse frequency 10 kHz Wavelength: 905 nm Half-angle laser divergence: 0.35 mrad Laser lifetime: 10 years typical Eye safety class: 1M 2.4.5 Environmental Specifications Standard Operating Temperature Range: -40°C to +60°C Relative Humidity Range: 0 to 100% IP Rating: IP 66 2.4.
CS135 Ceilometer Signal voltage levels Minimum Value Nominal Value Maximum Value RS232 input threshold Low 0.8V 1.5V - RS232 input threshold High - 2.0V 2.4V -15V - +15V 12KΩ - - - - 0.4V 4.4V - - RS485/422 input threshold voltage RS485/422 output (Unloaded) -0.2V - +0.
User Guide If the unit has been in storage or transit for more than a few months, the clock battery may be discharged. However, it will charge from the back-up battery or mains power. Close terminal mode with the command “close” (it will close automatically after 10 minutes of inactivity). If you are not installing the unit straight away you should disconnect the battery to avoid it being discharged. 4. Installation 4.
CS135 Ceilometer Remove the washers and nuts from the protruding length screw. Then lower the CS135 into place. If you plan to tilt the unit make sure it is orientated so that when tilted in the preferred direction the window angle steepens. Finally, secure the CS135 with the washers and nuts. If the surface is not level and flat it may be necessary to add washers under the base on one or more of the foundation screws. Fig 4.1 Mounting footprint 4.
User Guide Fig 4.
CS135 Ceilometer 4.5 Connectors and wiring 4.5.1 Base connectors The CS135 has three connectors on its base. One is for communications, one provides power input to the unit itself and the other one takes power from the unit to the hood heater and blower. NOTE Tilting the unit will provide better access to these connectors. Grounding boss Fig 4.3 Connector Layout The function of the connector pins is shown in Table 4.1.
User Guide Table 4.1 Function of the connector pins Mains Connector Pin Function 1 2 3 4 Live Not connected Neutral Earth Blower/Heater Connector Pin 1 2 3 4 5 6 E Communications Connector Pin Colour of 9-PIN `D’ supplied Connector cable (fig 4.
CS135 Ceilometer WARNING The power cable must not be carrying mains voltage when it is being connected or disconnected. 4.5.2.1 Power Connections The following guidance is given to help the wiring and installation of a permanent power supply to the sensor. As the sensor is used outside, the installation of the power cables will normally have to be carried out by a qualified electrician. Please check local safety regulations.
User Guide 4.5.2.2 Communications connections The communications cable is terminated at one end with a removable 9 pin D-connector (DB9). The D-connector can be connected directly to a PC or data logger such as the Campbell Scientific CR1000 using a suitable interconnecting cable such as the SC110. Connections and wire colours are shown in Fig 4.4. The connector can easily be removed for direct connection to screws terminals.
CS135 Ceilometer Fig 4.5 USB port 4.6 Connecting the Back-up Battery The CS135 will be shipped with the back-up battery disconnected. It should be connected as shown in Fig 4.6 before bringing the unit into use. Fig 4.6 Connecting Battery To do this the cover and enclosure lid must first be removed. The desiccant included for transport should be removed at the same time.
User Guide 4.6.1 Removing the Cover The cover is removed by removing the four screws as shown in Fig 4.7. Fig 4.7 Removing the Cover The cover can then be lifted away. CAUTION The cover contains a flying lead used to take power to the hood heater and blower. Be careful not to trap and damage this when lifting the cover clear. 4.6.2 Removing the Enclosure Lid Removing the lid covering the electronics unit is accomplished by removing the four screws as shown in Fig 4.8. Fig 4.
CS135 Ceilometer WARNING Opening the access door MUST be carried out by a competent person WARNING Removing the enclosure lid may expose hot surfaces 4.7 Storage Information The CS135 should be stored between -40°C to +70°C in a dry place, preferably with the enclosures securely fastened. The optics should be protected from possible accidental damage. For storage the back-up battery should be disconnected.
User Guide 5. Operation 5.1 Terminal mode 5.1.1 Entering/Exiting the CS135 Terminal Mode The menu system is entered with the command OPEN Sensor_ID Password (The menu will time out & close automatically if not used for 10 minutes). Sensor_ID is the CS135 identification, a single ASCII character 0-9,a-f,A-F case sensitive. The default is 0. If a password is set then it must be entered here otherwise it can be omitted. The following text should now be displayed:"CS135>".
CS135 Ceilometer The following settings are used: RS232/422/485 interface (default) RS232 Full Duplex Baud rate: 115200 Data bits: 8 Parity: none Stop bits: 1 Flow control: none USB service port Baud: rate 115200 Data bits: 8 Parity: none Stop bits: 1 Flow control: none Ensure that if the baud rate of the unit has been adjusted and then the corresponding bits per second value are entered in the port settings of the terminal emulator. The CS135 should now be ready to accept commands.
User Guide Table 5.1 Summary of the terminal mode commands available Command ALARMS Parameter/ Parameter block Angle BS Attenuated_SCAL E BS_Av_Time Noise_Gate Measurement_ Period CLOSE No parameters DEFAULTS HEATERS No parameters Hood Internal Laser Description Angle is the threshold tilt angle of the sensor beyond which an alarm will be flagged. The settable range is 0 to 90.0 degrees tilt and the default is 45 degrees.
CS135 Ceilometer Message_ID_D Message_ID_E NEWLASER OPEN No parameters ID Password Note that if low baud rates and message intervals or short polling are required it may not be possible to output multiple longer messages. Message_ID is the message type to output between 0 and 999 (default 001). If Message_ID = 0 no message type will be output. Up to 5 messages can be set. Please refer to Section 5.1.4. Resets the laser run time counter. Open the CS135 terminal mode.
User Guide Baud = 6, 19200 baud. Baud = 7, 38400 baud. Baud = 8, 57600 baud. Baud = 9, 76800 baud. Baud = 10, 115200 baud (default). Bits_Parity = 0, 8 bits, no parity, 1 stop bit (default). Bits_Parity = 1, 7 bits, even parity, 1 stop bit. Bits_Parity = 2, 7 bits, odd parity, 1 stop bit. STATUS No parameters TERMINAL Terminal Timeout TIME Date_Time UNITS Units Delay is the delay time in mS to TX (RS485 half-duplex mode only). Range 0-1000mS, default 100mS.
CS135 Ceilometer 109* CL31 Message 2, 1500 range bins, 5m resolution 110* CL31 Message 2, 770 range bins, 5m resolution 111* CL31 Message 2, No profile data 112* CL31 Message 2, Full CS135 output, 2048 range bins, 5m resolution 113 CT25K message 1 114* CT25K message 6 * = available in future OS 5.1.
User Guide command) Line Example line output 8 Heaters A B C Description of the line sections Section Description A Hood blower mode B Internal heater mode C Laser heater mode Line Example line output 9 MCFG X A B C D E Description of the line sections Section Description X Message interval (Note: Refer to the MCFG command) A Message ID A (Note: Refer to the MCFG command) B Message ID B (Note: Refer to the MCFG command) C Message ID C (Note: Refer to the MCFG command) D Message ID D (Note: Refer to the MCF
CS135 Ceilometer Line Example line output 15 HOffset A Description of the line sections Section Description A Height offset reported in feet or metres dependent upon the UNITS command Line Example line output 16 LaserRunDays A Description of the line sections Section Description A Number of days that the laser module has been active for Line Example line output 17 Flags 0000 0000 0000 Description of the most significant alarm word (left side, bits going left to right).
User Guide XXXX XXXX 1000 XXXX XXXX 0800 XXXX XXXX 0400 XXXX XXXX 0200 XXXX XXXX 0100 XXXX XXXX 0080 XXXX XXXX 0040 XXXX XXXX 0020 XXXX XXXX 0010 XXXX XXXX 0008 XXXX XXXX 0004 XXXX XXXX 0002 XXXX XXXX 0001 Photo diode calibrator has failed The sensor could not reach the desired gain levels Laser run time has been exceeded Laser temperature out of range Laser thermistor failure Laser is obscured.
CS135 Ceilometer Example of how to use the POLL command to request a specific message output type. First configure the CS135 into polling mode as shown in the example above and exit the terminal interface. To poll the CS135 for a particular message type, type the following. POLL 0 113 The example text above will request the “CT25K Message 1” and should look similar to the text below. CT00010 10 12345 ///// ///// 00000f80 5.1.
User Guide If the switch is pushed for four seconds the CS135 will reboot in exactly the same way as the REBOOT terminal command. If it is held closed while the CS135 is powered off and on again it will return to factory defaults. Note that to power cycle the CS135 the battery has to be disconnected as well as switching the main power off and on. Fig 5.1 Restoring Factory Defaults NOTE Opening the access door MUST be carried out by a competent person. 5.3 LED Indicator Figure 5.
CS135 Ceilometer A green LED is visible through the window, see Fig 5.2. It will give 0.5 second flashes as follows:1 flash every 10 seconds = OK, no fault 2 flashes every 10 seconds = warning (possible degraded performance) 3 flashes every 10 seconds = alarm (measurements not possible) 6. Messages 6.1 Data Messages General The CS135 can provide a variety of data message types to allow efficient output of data.
User Guide 1 = One cloud base detected 2 = Two cloud bases detected 3 = Three cloud bases detected 4 = Four cloud bases detected 5 = Full obscuration determined but no cloud base detected 6 = Some obscuration detected but determined to be transparent / = Raw data input to algorithm missing or suspect WA (1 character) = Warning or alarm status: 0 = No alarm or warning W = Warning A = Alarm tr (3 characters) = Window transmission, % h1 (5 characters) = 1st Height If detection status is 1, 2, 3 or 4 h1 = Lowe
CS135 Ceilometer 0004 XXXX XXXX 0002 XXXX XXXX 0001 XXXX XXXX Photo diode and Laser windows are dirty.
User Guide LINE 3 ETX CRC16 EOT CR LF where ETX = End-of-Text character CRC16 (4 characters) = CRC16-CCITT Checksum EOT = End-of-Transmission character CRLF = Carriage Return + Line Feed 33
CS135 Ceilometer MESSAGE 002 (Profile, no sky condition) LINE 1 SOH CS ID OS N ETX CR LF where SOH = Start-of-Heading character CS = Always "CS" ID(1 character) = A single ASCII character, 0-9, a - z or A - Z, case sensitive. Default ID = 0 OS (3 characters) = Operating system, 001 ...
User Guide h2 (5 characters) = 2nd Height If detection status is 2, 3 or 4 h2 = Second highest cloud base reported If detection status is 5 h2 = Highest signal received If detection status is 0, 1, or 6 h2 = "/////" h3 (5 characters) = 3rd Height If detection status is 3 or 4 h3 = Third highest cloud base reported If detection status is 0, 1, 2, 5 or 6 h3 = "/////" h4 (5 characters) = 4th Height If detection status is 4 h4 = Highest cloud base reported If detection status is 0, 1, 2, 3 or 5 h4 = "/////" fl
CS135 Ceilometer LINE 4 SSSSSSSSSSSSSSSSSSSSSSSSSSSSS........(2048 x 5 bytes) CR LF The two-way attenuated normalised backscatter profile (100000·srad·km)-1 unless otherwise scaled by the Attenuated_SCALE parameter. Each sample is coded with a 20-bit HEX ASCII character set; msb nibble and bit first, 2's complement. NOTE The profile is not corrected for the tilt angle.
User Guide MESSAGE 003 (no profile, sky condition, available in future OS) LINE 1 SOH CS ID OS N ETX CR LF where SOH = Start-of-Heading character CS = Always "CS" ID(1 character) = A single ASCII character, 0-9, a - z or A - Z, case sensitive. Default ID = 0 OS (3 characters) = Operating system, 001 ...
CS135 Ceilometer h2 (5 characters) = 2nd Height If detection status is 2, 3 or 4 h2 = Second highest cloud base reported If detection status is 5 h2 = Highest signal received If detection status is 0, 1, 5 or 6 h2 = "/////" h3 (5 characters) = 3rd Height If detection status is 3 or 4 h3 = Third highest cloud base reported If detection status is 0, 1, 2, 5 or 6 h3 = "/////" h4 (5 characters) = 4th Height If detection status is 4 h4 = Highest cloud base reported If detection status is 0, 1, 2, 3 or 5 h4 = "/
User Guide h5h5h5 (3 characters) = Height of the 5th cloud layer in 10s of metres or 100s of feet, if no 5th layer is reported h5h5h5 = '///'.
CS135 Ceilometer MESSAGE 004 (profile, sky condition, available in future OS) LINE 1 SOH CS ID OS N ETX CR LF where SOH = Start-of-Heading character CS = Always "CS" ID(1 character) = A single ASCII character, 0-9, a - z or A - Z, case sensitive. Default ID = 0 OS (3 characters) = Operating system, 001 ...
User Guide h2 (5 characters) = 2nd Height If detection status is 2, 3 or 4 h2 = Second highest cloud base reported If detection status is 5 h2 = Highest signal received If detection status is 0, 1, or 6 h2 = "/////" h3 (5 characters) = 3rd Height If detection status is 3 or 4 h3 = Third highest cloud base reported If detection status is 0, 1, 2, 5 or 6 h3 = "/////" h4 (5 characters) = 4th Height If detection status is 4 h4 = Highest cloud base reported If detection status is 0, 1, 2, 3 or 5 h4 = "/////" fl
CS135 Ceilometer CR LF = Carriage Return + Line Feed LINE 4 scale9res9n9 energy9lt9tr9ti_bl9pulse9rate9sum CR LF where scale (5 characters) = Scale parameter,%, 0 ... 99999. 100% is default res (2 characters) = Backscatter profile resolution in metres. n (4 characters) = Profile length 2048 energy (3 characters) = Laser pulse energy, %.
User Guide LINE 6 ETX CRC16 EOT CR LF where ETX = End-of-Text character CRC16 (4 characters) = CRC16-CCITT Checksum EOT = End-of-Transmission character CR LF = Carriage Return + Line Feed 6.3 CL31 Messages MESSAGES 101 - 106, (CL31 MESSAGE 1) LINE 1 SOH CL ID OS 1 Samples ETX CR LF where SOH = Start-of-Heading character CL = Always CL ID = A single ASCII character, 0-9, a - z or A - Z, case sensitive. Default ID = 0 OS = Operating system, 100 ...
CS135 Ceilometer LINE 2 S WA9h19h29h39flags CR LF where S (1 character) = message status: 0 = No significant backscatter 1 = One cloud base detected 2 = Two cloud bases detected 3 = Three cloud bases detected 4 = Full obscuration determined but no cloud base detected 5 = Some obscuration detected but determined to be transparent / = Raw data input to algorithm missing or suspect WA (1 character) = Warning or alarm status: 0 = No alarm or warning W = Warning A = Alarm h1 (5 characters) = 1st Height If detec
User Guide Description of the most significant alarm word (left word, bits going left to right) Bit Description 8000 XXXX XXXX Transmitter shut-off 4000 XXXX XXXX Transmitter failure 2000 XXXX XXXX Receiver failure 1000 XXXX XXXX Reserved for future use 0800 XXXX XXXX Reserved for future use 0400 XXXX XXXX Memory error 0200 XXXX XXXX Light path obstruction 0100 XXXX XXXX Receiver saturation 0080 XXXX XXXX Reserved for future use 0040 XXXX XXXX Reserved for future use 0020 XXXX XXXX Reserved for future use
CS135 Ceilometer CR LF = Carriage Return + Line Feed LINE 3 scale9res9n9 energy9lt9tr9ti_bl9L0112HN159sum CR LF where scale (5 characters) = Scale parameter,%, 0 ... 99999. 100% is typical res (2 characters) = Backscatter profile resolution in metres. n (4 characters) = Profile length 385, 770, 1400, or 1500 samples. energy (3 characters) = Laser pulse energy, %.
User Guide LINE 5 ETX CRC16 EOT CR LF where ETX = End-of-Text character CRC16 (4 characters) = CRC16-CCITT Checksum EOT = End-of-Transmission character CR LF = Carriage Return + Line Feed 47
CS135 Ceilometer MESSAGES 107 - 112, CL31 Message 2 (available in future OS) LINE 1 SOH CL ID OS 2 Samples ETX CR LF where SOH = Start-of-Heading character CL = Always CL ID = A single ASCII character, 0-9, a - z or A - Z, case sensitive. Default ID = 0 OS = Operating system, 100 ...
User Guide LINE 2 S WA9h19h29h39flags CR LF where S (1 character) = message status: 0 = No significant backscatter 1 = One cloud base detected 2 = Two cloud bases detected 3 = Three cloud bases detected 4 = Full obscuration determined but no cloud base detected 5 = Some obscuration detected but determined to be transparent / = Raw data input to algorithm missing or suspect WA (1 character) = Warning or alarm status: 0 = No alarm or warning W = Warning A = Alarm h1 (5 characters) = 1st Height If detection s
CS135 Ceilometer 0 to 8 9 -1 99 Amount of lowest layer in oktas Vertical visibility only available No sky condition data available Insufficient data h1h1h1 (3 characters) = Height of the lowest cloud layer in 10s of metres or 100s of feet d2 (1 character) = Cloud amount of the 2nd layer in oktas h2h2h2 (3 characters) = Height of the 2nd cloud layer in 10s of metres or 100s of feet, if no 2nd layer is reported h2h2h2 = '///'.
User Guide "L0112HN15" (9 characters) = Reserved, defaults shown sum = Sum of detected and normalized backscatter, 0 ... 999. Not used in Operating System 1 CR LF = Carriage Return + Line Feed NOTE This line is omitted from message 111. LINE 5 SSSSSSSSSSSSSSSSSSSSSSSSSSSSS........(5 x 770 bytes) CR LF The two-way attenuated normalised backscatter profile (100000·srad·km)-1 unless otherwise scaled by the Attenuated_SCALE parameter.
CS135 Ceilometer 6.4 CT25K Messages MESSAGE 113, CT25K Data Message No. 1 LINE 1 SOH CT ID OS 10 ETX CR LF where SOH = Start-of-Heading character CT = Always CT ID (1 character) = Unit number 0 ... 9, A ... Z (capitals only) Default ID = 0 OS (2 characters) = Operating system 00 ... 99 1 = Always = '1' 0 = Always = '0'.
User Guide If detection status is 4 h1 = Vertical visibility as calculated If detection status is 0 or 5 h1 = "/////" h2 (5 characters) = 2nd Height If detection status is 2 or 3 h2 = Second highest cloud base reported If detection status is 4 h2 = Height of highest signal detected If detection status is 0, 1 or 5 h2 = "/////" h3 (5 characters) = 3rd Height If detection status is 3 h3 = Highest cloud base reported If detection status is 0, 1, 2, 4 or 5 h3 = "/////" flags (8 characters) = Alarm or warning i
CS135 Ceilometer LINE 3 ETX CR LF ETX = End-of-Text Character CR LF = Carriage Return + Line Feed 54
User Guide MESSAGE 114, CT25K Data Message No. 6 (available in future OS) LINE 1 SOH CT ID OS 10 ETX CR LF where SOH = Start-of-Heading character CT = Always CT ID (1 character) = Unit number 0 ... 9, A ... Z (capitals only) Default ID = 0 OS (2 characters) = Operating system 00 ... 99 1 = Always = '1' 0 = Always = '0'.
CS135 Ceilometer If detection status is 2 or 3 h2 = Second highest cloud base reported If detection status is 4 h2 = Height of highest signal detected If detection status is 0, 1 or 5 h2 = "/////" h3 (5 characters) = 3rd Height If detection status is 3 h3 = Highest cloud base reported If detection status is 0, 1, 2, 4 or 5 h3 = "/////" flags (8 characters) = Alarm or warning information 4-byte hex coded As for CT25K message 1.
User Guide LINE 4 ETX CR LF ETX = End-of-Text Character CR LF = Carriage Return + Line Feed 7. Maintenance 7.1 General The CS135 is a robust weather resistant instrument and there is no need for routine maintenance other than cleaning. The instrument performance is monitored and any potential problems are covered by error messages. 7.2 Cleaning The CS135 window will require cleaning from time to time.
CS135 Ceilometer It is advisable to use an air duster to blow any loose dust and dirt from the window as a first step. Using a lint free lens cloth or lens tissue impregnated with a small amount of isopropyl alcohol solvent clean the surface by dragging the cloth across it being careful not to apply excessive pressure. Excessive pressure may lead to some types of contaminant scratching the window surface. Over time such scratches can lead to reduced sensitivity. 7.
User Guide 7.4 Removing the Enclosure Lid In some circumstances it may be necessary to remove the lid covering the electronics unit, for example to replace desiccant or carry out a hardware reset. This is accomplished by removing the four screws as shown in Fig 7.2. Fig 7.
CS135 Ceilometer 7.5 Diagnostic LED Indicators Within the Enclosure Two green LEDs labelled "LASER ON" and "STATUS" are visible on the DSP (see Fig 7.3). Their function is as follows:"LASER ON" LED:Off = laser off Flashing = laser fault On = laser on "STATUS" LED 1 flash every 10 seconds = OK 2 flashes every 10 seconds = warning (possible degraded performance) 3 flashes every 10 seconds = alarm (measurements not possible) The DSP "STATUS" LED duplicates the LED visible through the top window.
User Guide 7.6 Electrical Safety Testing NOTE If carrying out insulation tests do not use voltages above 300V RMS as the mains input has devices that effectively short circuit any voltages above this level.
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