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Impedo

DUO

User Guide

52

5

Embedded Operating Software (EOS)

The  Embedded  Operating  System  (EOS)  is  based  on  a  dual  Linux/Android
configuration.  Linux  provides  infrastructure  for  low-level  functions,  and  Android
provides  the  Graphical  User  Interface  (GUI).  The  Impedo  Duo  is  supported  by  the
Osprey Lite and Osprey Pro software suites.

The latest version of Osprey Lite is available for download at

www.ctlab.com

. Please

refer to the document

Osprey Lite User Guide

for information on using Osprey Lite to

interact with the Impedo Duo.

For information about Osprey Pro, please contact CT LAB.

5.1

EOS Subsystems

5.1.1

Meter Gateway

All  external  communication  is  handled  by  Meter  Gateway.  It  serves  as  the  main
control subsystem of the Impedo Duo. As such, when Meter Gateway is not running
remote  communication  is  not  possible.  The  built-in  watchdog  will  restart  Meter
Gateway  if  it  should  become  non-responsive.  Restarting  Meter  Gateway  has  no
impact on PQ data capturing and recording.

Meter Gateway is responsible for updating the OLED display. If the time is updated
every second, Meter Gateway is running. It houses (amongst others) the following
components:

Space Reclaimer

This component is part of Meter Gateway, and is responsible
for deleting data as the internal storage becomes full. See
Section 5.7.3.1 for details on configuring Space Reclaimer.

Health-Manager

This component is part of Meter Gateway, and is responsible
for powering off the instrument when health parameters
exceed their limits (see Section 5.7.3.2 for details).

Time-Master

This component is part of Meter Gateway, and is responsible
for  managing  time  on  the  instrument.  It  determines  when
time  is  valid,  and  selects  the  best  source  of  time.  Section  0
describes its configuration.

Modbus

This component is part of Meter Gateway, and is responsible
for serving Modbus data.

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Содержание Impedo DUO

Страница 1: ...er User Manual Version 2 4 CT LAB Pty Ltd PO Box 897 Stellenbosch 7599 South Africa 15 Termo Lane Techno Park Stellenbosch 7600 South Africa Tel 27 21 880 9915 Fax 27 21 880 1088 Email info ctlab co z...

Страница 2: ...9 1 4 5 Validity and applicability of this document 9 2 Introduction to the Impedo Duo 10 2 1 Impedo Duo Product Description 10 2 2 Receiving your Impedo Duo 11 2 2 1 Receiving your shipment 12 2 2 2...

Страница 3: ...4 3 Voltage Inputs 32 2 4 4 Current Sensor Inputs 34 2 4 5 Current Transducer Inputs 36 2 4 6 Relay Outputs 37 2 4 7 GPS 38 2 4 8 Ethernet Ports 39 2 4 9 USB Peripheral Ports 40 2 4 10 OLED Display 4...

Страница 4: ...ver 51 4 10Ethernet connectivity 51 4 11Time of Day and Date 51 4 12Device in error state 51 5 Embedded Operating Software EOS 52 5 1 EOS Subsystems 52 5 1 1 Meter Gateway 52 5 1 2 Storer 53 5 2 Commu...

Страница 5: ...ching a Previously Created and Configured Meter Point 74 5 8 5 Configuring a Meter Point 74 5 9 Realtime View 78 5 9 1 Fundamentals 78 5 9 2 Power 79 5 9 3 Harmonics 80 5 10PQ Events 81 5 11Log Viewer...

Страница 6: ...104 7 2 Display 104 7 3 Transport 104 7 4 Storage 104 7 5 Warrantee and Repair 105 7 5 1 Warrantee Statement 105 7 5 2 Technical Support 106 7 5 3 Sales Assistance 106 7 5 4 Repair and Calibration 107...

Страница 7: ...efore any installation can commence 1 1 Symbols 1 Notice Used to call attention to important information Caution Used to indicate operating or maintenance procedures to be respected in order to preven...

Страница 8: ...sonnel and the instrument and also cause personal injury or physical damage The standard safety precautions must be followed while performing both the installation and service work The terminals expos...

Страница 9: ...rposes only and is subject to change without prior notice Please see www ctlab com for the latest copy of this document 1 4 2 Proprietary rights This publication contains information proprietary to CT...

Страница 10: ...o Duo is a comprehensive dual feeder multi function power monitor and recorder with GPS locked time synchronisation The instrument contains two independent time synchronised meters each with 4 x volta...

Страница 11: ...s supplied with the instrument Figure 2 shows the sealed ImpedoDUO box that is shipped Figure 1 Inside of the Impedo DUO box Figure 2 Closed and strapped Impedo DUO box The Impedo DUO may be ordered w...

Страница 12: ...DUO in a plastic enclosure o Impedo DUO has no water damage or damp in the plastic enclosure o Impedo DUO screen is intact and has no cracks o Ethernet cable Flash drive and the screw driver is includ...

Страница 13: ...low these instructions 1 Insert the instrument into a plastic bag to prevent water damage during shipment transit and 2 Protect the instrument properly and also put it inside a padded box to prevent m...

Страница 14: ...4 th terminal connection This 4 th terminal acts as a reference channel and can be any phase voltage if a 3 phase line line voltage circuit is measured o If it is a 3 phase line neutral voltage circu...

Страница 15: ...and more than 3 weeks of 3 sec data harmonics and inter harmonics The use of a SD card for data storage enhances the capability of the instrument not to lose data configuration or firmware if without...

Страница 16: ...PQ parameters can be recordable simultaneously 2 3 2 Impedo DUO External Interfaces 2 3 2 1 Voltages The two 3 phase voltage inputs to the Impedo DUO interfaces directly to 110 V VT circuits or direc...

Страница 17: ...E 802 3 2008 compliant PoE Plus 12 W source The internal LiFePO4 battery powers the instrument in the absence of power This battery guarantees 2 000 charge discharge cycles If cycled once per day it t...

Страница 18: ...e information can please contact CT LAB 2 3 6 Sampling Rate The instrument samples all analog input signals at a rate of 500 kHz 10 000 samples per cycle and then digitally down sample the data to 50...

Страница 19: ...user manual for more information on event recordings 2 3 9 10 12 Cycle Block Recording The Impedo DUO records all RMS and harmonic data from each 10 12 cycle block 200ms block for both voltage and cur...

Страница 20: ...synchronised parameters are time stamped with a 1 second time resolution 2 3 11 Synchrophasors The Impedo DUO is also a Phasor Measurement Recorder PMU Recording of 50 Hz or 60 Hz synchrophasors can...

Страница 21: ...ated Harmonics Aggregated Inter Harm VOLTAGE Frequency Hz Voltage Volt Voltage of Nominal Voltage of Fundamental Voltage Phase Angle Degrees Voltage Unbalance V Positive Amplitude Volt V Positive Angl...

Страница 22: ...ggregated Trends Aggregated Harmonics Aggregated Inter Harm CURRENT Current Ampere Current of Fundamental Current Phase Angle Degrees Current Unbalance I Positive Amplitude Ampere I Positive Angle Deg...

Страница 23: ...Harm POWER Active Power Watt Reactive power VAR Apparent Power VA Power Angle Degrees Power Factor POWER IMPORT Imported Active Power Watt Imported Reactive Power VAR Imported Apparent Power VA Impor...

Страница 24: ...C Input impedance channel 1 M CURRENT SENSOR INPUTS Number of channels 2 sets of 4 x galvanically isolated inputs Measurement input range 0 5 0 ARMS Maximum continuous current 6 0 ARMS 3 sec over curr...

Страница 25: ...5 MHz simultaneously sampled Waveform storage rate Adjustable from 1kHz to 50kHz ADC Resolution 16 Bit Overall accuracy class 0 1 Fast Transient Capturing 20 s COMMUNICATION Ethernet 2 x Gigabit Ethe...

Страница 26: ...EE 802 3 compliant 35 60 VDC On board battery LiFePO4 2 000 charge discharge cycles PHYSICAL Construction Aluminium 220mm x 131mm x 85mm L x W x H Mounting options 3U 19 Rack Panel Mount Portable Case...

Страница 27: ...functionality is described in Section 5 The OLED display on the right side of the front panel provides the user with operational and health information of the instrument Detail on interpreting the st...

Страница 28: ...Impedo DUO User Guide 28 Figure 5 Back of instrument Figure 6 Right side of instrument GPS USB 1...

Страница 29: ...IEEE 802 3 2008 compliant Power over Ethernet PoE A built in LiFePO4 battery will power the instrument for up to 20min in the absence of power This battery has a design life expectancy of more than 2...

Страница 30: ...actively limited to 30 VA enabling Impedo Duo to be powered directly from 110V 50 60Hz VT circuits An internal electronic fuse protects the Impedo DUO from over and under voltage conditions The Imped...

Страница 31: ...ut down to protect the battery When power is restored the instrument will automatically restart within 60 seconds if the battery status is above 30 of full capacity or first recharge until the battery...

Страница 32: ...N V3 N in a four wire Star connection Figure 10 and referenced to any one of the three phases in a 3 wire Delta connection Figure 11 Terminal 5 and 6 are used for the 4th V4 V4 voltage input It is a...

Страница 33: ...DUO User Guide 33 Figure 10 Impedo Duo 4 wire star connection on meter A Figure 11 Impedo Duo 3 wire delta connection on meter B Phase 3 Phase 2 Phase 1 Phase 4 Ref Phase 4 Neutral Phase 3 Phase 2 Ph...

Страница 34: ...analog input stage with minimum phase error high bandwidth and zero temperature drift 2 4 4 Current Sensor Inputs Each individual meter contains 4 galvanically isolated resistive current shunt inputs...

Страница 35: ...Current Return 5 I3 Phase 3 Current Input 6 I3 Phase 3 Current Return 7 I4 Phase 4 Current Input 8 I4 Phase 4 Current Return Figure 12 Current sensor connection Do not disconnect the current terminals...

Страница 36: ...nt inputs are available on an 8 terminal lockable connector plug with screw terminals Each terminal can accommodate conductors with size up to 1 5mm 2 Table 4 Current transducer connection layout Term...

Страница 37: ...The relay outputs are available on an 8 terminal lockable connector plug with screw terminals Each terminal can accommodate conductors with size up to 1 5mm 2 Table 5 Relay switch connection layout Te...

Страница 38: ...port is used to interface an external powered 3V3 GPS antenna to the Impedo Duo The built in GPS is used to measure absolute time The Impedo Duo locks its internal clock to within 100ns from absolute...

Страница 39: ...t connect Ethernet port 1 to a network with an active DHCP server as this may cause the network to stop functioning properly The IP address of Ethernet port 1 is fixed at 192 168 7 1 The instrument se...

Страница 40: ...h port can power peripherals with a peak power of 2 5W However it is recommended not to exceed simultaneous average power of 2 5W Figure 17 USB ports 2 4 10 OLED Display The OLED display is used to di...

Страница 41: ...llation Provide real time waveform RMS phasor and harmonic feedback The detail of each icon on the Multi Touch display is discussed in Section 5 2 5 Firmware The Impedo DUO firmware revision is shown...

Страница 42: ...and increase the storage live of the Impedo DUO The reset switch is reachable via a small hole close to the GPS port on the right side of the instrument see Figure 18 A paperclip or similar device is...

Страница 43: ...see Section 6 2 1 and the battery icon flash on the OLED the instrument battery level is below the operational level Wait until the battery disappears and the flashing power icon is visible on touchin...

Страница 44: ...con the PDU will animate the gesture required to switch on the instrument A small processor icon followed by a check mark icon will display on the OLED after recognition of a valid start gesture The c...

Страница 45: ...play with the unlock screen with an unlock button on the upper right corner of the screen as shown in Figure 19 The unlock screen is password protected the user may choose to enable or disable passwor...

Страница 46: ...cation Press and hold the power off button see below located on the bottom of the display A dialog will pop up to confirm the action Select OK to power off the device The shutdown sequence may take up...

Страница 47: ...ort on the right side of the instrument see Section 3 1 Figure 19 A paperclip or similar device is required to toggle the switch The instrument is powered when the switch is in the depressed state Not...

Страница 48: ...or is crossed out the instrument is not recording The reason may be that the instrument does not have valid time or that the recording subsystem was disabled see Section 5 1 2 Meter side A is configu...

Страница 49: ...shows the internal temperature at which the device is currently operating 4 6 Battery Status The Impedo Duo will automatically power off when the battery is depleted with absence of the primary power...

Страница 50: ...in 4 8 Time source The Impedo Duo has three sources of time It can automatically determine which source to use The user can override the automatic selection and specify which time source to use see Se...

Страница 51: ...and 2 are connected 4 11 Time of Day and Date The time of day and date is displayed at the bottom of the OLED The time is updated every second Should this not be the case the Meter Gateway subsystem...

Страница 52: ...e The built in watchdog will restart Meter Gateway if it should become non responsive Restarting Meter Gateway has no impact on PQ data capturing and recording Meter Gateway is responsible for updatin...

Страница 53: ...the Impedo Duo using Registration see Section 5 6 The instrument key is unique to each instrument and comes preloaded on the instrument The key is also provided on the USB storage device shipped with...

Страница 54: ...e o Calibration issued by o Firmware o Time source o Configuration date Site name Description Voltage level Panel name Substation VT connection point Contact person Contact number Voltage information...

Страница 55: ...or the specific meter point A meter point can only be created when the ImpedoDUO has a valid time source 5 3 2 Time Data recorded with invalid timestamps are not useful The Impedo Duo will attempt to...

Страница 56: ...e a discontinuity in the data and a new data segment cf Section 5 6 3 will be created Time creep will not cause a discontinuity in the recorded data However frequency measurements are not valid and wi...

Страница 57: ...ication When on the first screen of an application it will return you to the Duo home screen The Keyboard Hide button replaces the back button whenever the keyboard is visible onscreen Pressing it hid...

Страница 58: ...tire instrument the user must touch and hold the power button A Power Off window will pop up to ask the user to confirm powering the instrument down Pressing the OK button will power the instrument do...

Страница 59: ...an enterprise fleet the instrument will not attempt to establish communication with an enterprise server The user can enter the fleet password to enrol it in a standalone fleet The instrument s UI can...

Страница 60: ...it Osprey Pro supports multi user accounts each password protected Osprey Lite does not support multi user accounts In Enterprise mode the lock screen requires user authentication If no connection wit...

Страница 61: ...electing Ethernet in Preferences see Figure 24 Only the IP address of ETH 2 can be configured 5 7 1 2 Communicating via Ethernet through a Router Connect the Impedo Duo to the router through Ethernet...

Страница 62: ...enterprise network This means the laptop PC needs to be setup to receive its IP configuration through DHCP Clicking Discover on the Address Book page of the Osprey software connects the instrument and...

Страница 63: ...6 Manage Instrument options Description Clarification Restart Storer Service Restart the PQ recording subsystem Restart Meter Gateway Service Restart the instrument control subsystem Enable Disable S...

Страница 64: ...tes old data when the internal storage becomes full It can be configured to delete data oldest first when reaching a specified percentage of storage usage or when the remaining space available reaches...

Страница 65: ...rge level drops below 0 Uncheck the Enable checkbox see Figure 27 to instruct Health Manager to disregard the system health Disabling Health Manager may cause permanent damage to the instrument should...

Страница 66: ...ny PQ data until it has valid time 5 7 3 4 Security Figure 29 Security configuration 5 7 3 4 1 Override Password The override password is used to override a user login password applicable when the ins...

Страница 67: ...ent By default it is empty 5 7 3 4 3 Modbus Password The Modbus subsystem uses this password during authentication 5 7 4 Time Zone Figure 30 Time zone configuration The time zone setting configures th...

Страница 68: ...points or reattach previously created meter points The display is divided into the navigation menu on the left and the detail view on the right 5 8 1 Creating a New Meter Point To create a meter poin...

Страница 69: ...Declared Voltage can be different from the nominal voltage in that the utility can operate the network at a higher level than designed This ensure that the client at the furthest end of the line still...

Страница 70: ...current This should correspond with the physical connections of the chosen sensor type to the instrument Enter the CT ratio If channel 4 uses a transducer with a different ratio than the rest uncheck...

Страница 71: ...ation A verification screen for the voltage channels is now available Verify the physical connections by the phase rotation as displayed the VT ratios and the declared voltage The VT ratio and declare...

Страница 72: ...ck Finish to complete the setup The newly created meter point is now attached to the specific meter selected The instrument will now record any configured data for the created meter point note that if...

Страница 73: ...menu 4 This will display detail about the meter point Click Detach to detach the meter and confirm the action Confirm that the meter point was detached by checking the meter point status on the OLED...

Страница 74: ...a meter point select the desired meter 5 and click Attach on the bottom right hand of the screen Select the desired meter point and click Select The meter point will now be attached to the meter The...

Страница 75: ...a to be recorded has to be activated The Impedo Duo can record all the IEC61000 4 30 prescribed trend periods In addition to these two custom trend periods are available should the user need it The Im...

Страница 76: ...g one s finger vertically up or down over the list of monitors scrolls the list up or down respectively Refer to Osprey Lite User Guide for a description of each event type and its configuration param...

Страница 77: ...information box will inform the user of a successful configuration change 5 8 5 5 Predefined Templates The Impedo Duo comes preloaded with specific measuring templates To apply a template select the m...

Страница 78: ...ith and Only one meter s data is displayed at a time 5 9 1 Fundamentals Figure 41 Realtime View Fundamentals This view provides a grid with readings of the fundamental phasors for voltage current and...

Страница 79: ...me View Power This view provides a grid with the RMS reading of the voltage current and power fundamental phasors Diagrams for power channels 1 to 4 and the total power visualize the relative size and...

Страница 80: ...nt Select the desired harmonic by pressing on the harmonic number drop down Select between harmonic and inter harmonic readings by pressing on the Harmonic drop down The spectrum up to the 49th harmon...

Страница 81: ...trument These events are not classified to any specific standard Classification is done offline with the Osprey Software Select the meter point for which the event list must be shown Select the date f...

Страница 82: ...tem event log This is a diagnostic log that provides insight into the workings of the internal subsystems Select the date and time from which to query and then the duration in days hours and minutes C...

Страница 83: ...scheduled time Select the recording duration 1 minute Recordings can be repeated with a specified interval The interval must be at least as long as the recording duration Finally select the types of d...

Страница 84: ...A dialog will appear showing the progress of the export The export can be safely aborted and the data exported up to that point will be on the USB device The user can select which harmonics to export...

Страница 85: ...Impedo DUO User Guide 85 Figure 49 Export harmonic selection...

Страница 86: ...e 7 Manage Data delete options Description Clarification Delete all meter points and associated data All meter points and their data including configurations will be deleted Delete meter point and ass...

Страница 87: ...instrument settings such as passwords time zone and Space Reclaimer configuration will be deleted After a factory reset the instrument will reboot Press Reset Instrument to reset the instrument to it...

Страница 88: ...four drilled holes as shown in Figure 52 b Front Plate The plate with the smaller cavity of the two plates and eight drilled holes as shown in Figure 53 c Four mounting screws and four holding screws...

Страница 89: ...52 on the panel door where the instrument should be installed mark the inside cavity and mounting holes on the panel door Step 2 Cut the marked cavity into the panel door and drill the mounting holes...

Страница 90: ...igure 54 Step 4 Fit the Impedo Duo into the installation plates and screw the holding screws into the Impedo Duo 6 1 2 19 Rack Mounting Installation A 19 rack 4U stainless steel mounting plate carry t...

Страница 91: ...e portable unit are listed in Table 8 Figure 57 Impedo DUO portable unit Table 8 List of accessories Accessory description Qty Portable Impedo DUO case 1 GPS antenna 15m extension cable 1 Power Connec...

Страница 92: ...inal located on the power connector first Table 9 and Figure 58 depict how to connect the AC power supply Table 9 AC power connection layout Terminal Legend Description 1 L Live Terminal 2 E Safety Ea...

Страница 93: ...trument is shipped with the reset switch switched off to protect the battery and increase the storage live of the Impedo DUO The reset switch is reachable via a small hole close to the GPS port on the...

Страница 94: ...inal Legend 110V VT Circuit or 400V 550V Star 4 wire Systems 1 V1 Phase Voltage 2 V2 Open 3 V3 Open 4 Vcom Neutral 5 V4 Earth 6 V4 Neutral Connect the phase Voltage to Voltage Inputs 1 as shown in Fig...

Страница 95: ...1 V1 Phase 1 2 V2 Phase 2 3 V3 Phase 3 4 Vcom Neutral Star connection point 5 V4 Earth optional for 400V systems only 6 V4 Star connection point Neutral Optional for 400V systems only Connect Phase 1...

Страница 96: ...Impedo DUO User Guide 96 Meter A and B are not conformed to specifically measure single phase 4 wire Star or 3 wire Delta but rather handle all topologies...

Страница 97: ...ction Terminal Legend 110V VT Circuit or 400V 550V Delta 3 wire Systems 1 V1 Phase 1 2 V2 Phase 2 3 V3 Phase 3 4 Vcom Open Note Vcom may also be connected to the earthed Phase Phase 2 on 110V VT circu...

Страница 98: ...Impedo DUO User Guide 98 Meter A and B are not conformed to specifically measure single phase 4 wire Star or 3 wire Delta but rather handle all topologies...

Страница 99: ...n interface with 1 A or 5 A CT circuits and has a peak long term current withstand of 6 A and 50 A for 3 seconds Table 13 CT circuit connection layout Terminal Legend Description 1 I1 Phase 1 Current...

Страница 100: ...rrent Return 7 I4 Phase 4 Current Input 8 I4 Phase 4 Current Return Figure 65 CT circuit connection layout The Duo can be configured to derive the Neutral current by the summation of the 3 line curren...

Страница 101: ...edo DUO have a peak voltage input range of 2 V 1 4 VRMS Table 15 Current transducer sensor connection layout Terminal Legend 1 V Output Current Transducer Circuits 1 V1 Voltage 1 2 V1 Voltage 1 Refere...

Страница 102: ...16 Current transducer sensor connection layout Terminal Legend 1V Output Current Transducer Circuits 1 V1 Voltage 1 2 V1 Voltage 1 Reference 3 V2 Voltage 2 4 V2 Voltage 2 Reference 5 V3 Voltage 3 6 V3...

Страница 103: ...n Delta connected 3 wire circuits 6 2 6 Ethernet Based Communication See Section 0 and 0 for details 6 2 7 GPS A GPS antenna can be connected to the instrument The GPS provides accurate time and locat...

Страница 104: ...or similar chemical products Use only water Ideally use water with a lint free scratch resistant cloth microfiber is best to clean the Impedo DUO screen by dampening the cloth slightly Then clean the...

Страница 105: ...nths from the date of the installation or eighteen 18 months from the date of shipment whichever occurs first The warranty period for new spare parts and components sold by CT Lab Pty Ltd is twelve 12...

Страница 106: ...ed or repaired with parts or assemblies not certified in writing by CT Lab Pty Ltd including without limitation communication parts and assemblies improperly modified or repaired including as a result...

Страница 107: ...d how it can be tracked and with a copy of the fault report The package and instrument remain the responsibility of the client until delivered to CT Lab The Impedo DUO stores calibration constants on...

Страница 108: ...untries The proper disposal of electrical devices prevents the occurrence of any negative effects on people or the environment follows the specific procedures for handling harmful substances and enabl...

Страница 109: ...Impedo DUO User Guide 109 Appendices 8 Impedo DUO dimensions...

Страница 110: ...Impedo DUO User Guide 110 8 1 Panel mounting plates 8 2 19 installation plate...

Страница 111: ...Impedo DUO User Guide 111 9 Impedo DUO wiring diagram...

Страница 112: ...C 30VA max 300V 0 1A max RMS RMS Active Antenna 3 3V DC 0 1A max USB2 0 High Speed Host 5V DC 0 5A max CURRENT SENSOR INPUTS Full Scale Range 6 0A RMS CURRENT TRANSDUCERS Full Scale Range 1 0V RMS ETH...

Страница 113: ...Impedo DUO User Guide 113 11 Portable ImpedoDUO...

Страница 114: ...are standard options Impedo DUO Panel mount Impedo DUO Panel mounting plates GPS antenna 15m extension cable GPS antenna mounting bracket Panel mounting plates GPS antenna 15m extension cable GPS ante...

Страница 115: ...ension cable GPS antenna mounting bracket Screw driver USB with meter key Ethernet cable Impedo DUO Portable unit Impedo DUO Portable Impedo DUO case GPS antenna 15m extension cable Power Connection s...

Страница 116: ...Portable case Magnetic GPS antenna 15m extension cable Voltage connection wiring Voltage connection clips Current connection wiring US clamps 250 500 1000 5A CT Micro clamps 5A 1V Pic tails for safe c...

Страница 117: ...Impedo DUO User Guide 117 Screw driver USB with meter key Ethernet cable...

Страница 118: ...two meters Meter Point The physical measuring point that is measured by a meter Fleet password Used to secure communication across a fleet of instruments Instrument Key Unique key that is required to...

Страница 119: ...GUI Graphical User Interface PQ Power Quality OLED Organic Light Emitting Diode NTP Network Time Protocol RTC Real Time Clock ppm Parts Per Million PDU Power Distribution Unit VT Voltage Transformer C...

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