Real Time Spectrum Analyser Preliminary Operating Instructions
Contents
1. ZTN EAN LU 2 T V Pk OC 00 oo 20dBu 3 5dBu M CMP REF 29 amp 12 7 ao L AN I ACT OMODE FREEZI o A d 3 MENU ST ENTER ui RTS 1 Ref Level Shows Ref level as in basic RTA mode 2 SLM Shows SLM readout as in basic RTA mode 3 Rei Mem No Shows the reference memory number as selected via option keys 4 Comp Mem No Shows the memory number for the information to be compared with the reference 5 Option Keys Selects memory location number for Ref Mem or Comp Mem see below 6 Enter Key Toggles option key control between Hei Mem No and Comp Mem No Real Time Compare Press menu and select Real Time Compare by using menu key or option keys Press Enter to load selection This function allows real time measurements to be compared with information stored in a memory The resultant difference curve to shown on the main RTA display TN LEN 1 2 T k V PK OC oo 00 20dBu 3 5dBu R COMP MEM 25 7 lt i a L A J MODE FR2. EES 3 5dBu A WT DSP N SLM N PN a a aN LT we rer o 2 MENU NZ LENS CES 5 6 7 ER ONS RET 1 Ref Level Shows Ref level as in basic RTA mode 2 SLM Shows SLM readout as in basic RTA mode 3 RTA Status Shows A weighting filter status for main RTA display Yes No 4 SLM Status Shows A weighting filter status for SLM readout Yes No 5 Option Key 1 Selects A weighting Status for main display 6 Option Key 2 Selects A weighting Status for SLM readout 7 Enter Key Not used SPL Relative Press menu and select SPL Relative by using menu key or option keys Press Enter to load selection gn Sec Let MENU OPTIONS RESOLUTION AV PK MIC LINE OO CO OO 20dBu dBu LM REL dB a A A 2 KE CO E ENTER O ae FUN fe 5 4 A S 1 Ref Level Shows Ref level as in basic RTA mode 2 SLM Shows SLM readout as in basic RTA mode 3 Ref Level Shows current reference level in dB or OFF if SLM Rel Option is not selected 4 Option Keys Sets reference level for SLM 5 Enter Key Toggles SLM relative mode on off RT1 Page 6 SLM Modes Press menu and select SLM Modes by u
3. El d SUPPLY FUSE Omm SA see REPLACE CEU Sev CAUTIO L REMPLACER PAR ON FUSIBLE ES MEME TYPE WARNING 5 4 ch LEN G A 7 LC CD KL E E K 72 SM r ji 7 7 MAINS H XTA ELECTRONICS LTD MIC IN LINE INT SCH 50 60 Hz 40 WATTS POWER LE EL A P gt J E VOLTAGE 7 Gs He NOISE OSCILLATOR LH SERIAL INTERFACE PRINTER PORT ee one e fo0000 Aoovoocoo CAUTION Ki SES 9600000000 ATTENTIC ONLY Mains Power is connected via a standard IEC socket A compatible power cord is supplied with the unit Mains Fuse is located in the mains inlet socket A spare fuse is provided within the pull out compartment Always replace fuse with the correct type as shown on the rear panel legend Voltage Selector Switches between two nominal operating voltages Please ensure this is set for the correct voltage before operating Disconnect power to the unit before resetting this selector Power Switch a double pole switch is provided isolating both live and neutral connections Serial Interface Port An RS232 optional RS422 interface via a 9 pin D shell connector allows connection of external equipment computer Printer Port this centronics IBM compatible port allows the direct connection of approved printers via a standard 25 pin D shell connector See Printer section fo
4. HI Real Time Spectrum Analyser Preliminary Operating Instructions XTA Electronics Ltd Riverside Business Centre Worcester Road Stourport on Severn Worcs DY11 9BZ England Tel 01299 879977 Intl 44 1299 879977 Fax 01299 879969 Intl 44 1299 879969 USA Distribution Group One Ltd 80 Sea Lane Farmingdale N Y 11735 U S A Tel 516 249 1399 Fax 516 753 1020 XTA Electronics Ltd 17 10 94 Contents Introduction eebe eh Features Front Panel Functions Rear Panel FUNCIONS e ENEE Eed SEA ANE AE Basic RTA Mode een EEN A nt dat dei LA A Weighting EE EE E WEE E Ed ie EE Memory Store ai nat ent pe nn dater dE aint tee Memory Accumulate iii Memory Reca oean ccc in eee ne fetes ee Memory Compare iii Real Time Compare iii MMe Level MOMS wees ese Peder nt eed den nt ete ede veces RT60 Mode Introduction RT60 Default le EE RT60 Measurement Mode Sweep Mode 3 2 i eccha aden retiennent luttent Output lee Sweep Start Frequency rise tin miennes EES Sweep End Frequency us Unit set up Menu Options us Using an External Primor fans EN AERE ES eene EE Warranty O Oo O OO ON DOD QA 11 11 12 13 13 13 14 14 15 16 Introduction The RT1 Real Time Spectrum Analyser represents a breakthrough in audio analysis offering capabilities far beyond the reac
5. SWEEP SPEED FAST m ENTER Quit PRINT RANGE aN e E UN 1 Sweep Speed Displays sweep speed slow medium or fast 2 Option Keys Set Sweep speed Unit Set up Menu Options This menu is accessed by pressing quit and mic line keys whilst in RTA mode The following options are available 1 Printer Type Epson FX80 Epson LQ850 IBM Proprinter Canon BJ10 Use option keys to view options and enter key to confirm printer choice A start symbol identifies the current selection 2 Computer Port On Off Use option keys to select status and confirm choice with enter key 3 Time and Date Automatic time and date stamp is provided for printer output and this information is stored in memory with measurement information To reset i Use option keys to move flashing cursor ii Use range keys to change 4 User Name Automatic labelling is provided for printer output of up to 16 characters To Set i Use option keys to move cursor ii Use range keys to change Using an External Printer Any approved centronics compatible printer can be directly connected to the printer port via the 25 pin D shell conne
6. current time base of the RTA display adjustable between 62 5mS and 256 seconds per LED column 4 Option Keys Sets RTA display time base 5 Enter Key Press to initiate time level measurement RT60 Mode The RT1 provides for accurate measurement of RT reverberation time using internally gated noise or an external source Auto and manual window functions are provided RT decay curve window is shown on the main RTA display and the RT time is shown on the LCD screen Measurements can be taken at any octave centre frequency 31Hz to 16kHz or wideband The decay curve can be expanded on the RTA screen if required to aid manual adjustments of the measurement window RT measurements can be stored recalled or accumulated into memory as in the RTA mode RT1 Page 10 RT60 Default Mode Press mode key until RT LED lights Pressing Quit whilst in RT60 mode will always return the unit to this default mode N EN 1 2 t MENU OPTIONS v pk OO28 OO OO 30dBu 15dBe RT60 FREQ 125Hz a PN PN gt D e e Se va MENU Si ENTER Ur PRINT 1 Ref Level Shows the current reference level as selected via th
7. expand the displayed decay curve Note Display time 60mS 2mS per LED column 120mS 4mS per LED column etc RT1 Page 11 5 Option Key 1 Sets measurement window status 6 Option Key 2 Sets RTA display horizontal time period 7 Enter Key Not used 8 Range Keys These are used to adjust measurement window start and end points dependant on the status set by option key 1 The auto LED will flash when these keys are active Adjustments made using these keys will be shown on the main RTA display with solid columns representing the new measurement window The recalculated RT time based on this new window will be displayed in the LCD window RT60 Menu Options Pressing the menu key and using the two option keys allows all RT menu options to be previewed and loaded if required via the enter key Operating procedures are identical to those discussed previously for the RTA menu options The following options are available i Store to memory an additional 32 memories available for RT only ii Accumulate to memory Memory Recall make it the current decay curve iii Note to manually edit a recalled memory press the enter key following memory recall to Sweep Mode The provision of sweepable sine wave and band limited pink noise output sources together with tracking filters for input measurements further extends the capabilities of the RT1 Start and end frequencies and sweep speed are adjustabl
8. servicing to qualified personnel The mains power cord to the power supply is fitted with a safety earth ground connection Do not operate this unit with this connection removed Unpacking the RT1 After unpacking the unit please check carefully for damage If damage is found please notify the carrier concerned at once Any claim must be instigated by you the consignee Please retain all packaging in case of future reshipment RT1 Page 2 Front Panel Functions 100spI 92 8spl DECAY BAR 2 PKH a 10 11 12 13 14 Main RTA Display Displays power level at 30 one third octave centre frequencies 25Hz to 20kHz Display range is switchable to 7dB 14dB about the centre reference point Level Displays the overall level at audio frequencies This level is 10dB greater than shown on the panel calibration LCD Display Shows menu options and various parameters dependant on the menu selection See operating section for detailed information Menu Allows menu functions to be previewed on the LCD display Option Keys Adjust parameters and options See operating section for detailed information Also
9. EEZI o EX 7 3 MENU 57 ENTER or ee 1 Ref Level Shows Ref level as in basic RTA mode 2 SLM Shows SLM readout as in basic RTA mode 3 Mem No Shows the memory number selected as the reference via option keys 4 Accumulations Shows the number of accumulations in the current memory location RT1 Page 9 5 Option Keys Selects memory number required 6 Enter Key Not used Time Level Mode Press menu and select Time Level Mode by using menu key or option keys Press Enter to load selection This option allows peak or average level information obtained via the SLM section to be displayed against time on the main RTA display In this way an historical picture of the maximum levels reached is obtained The time base of the RTA display is adjustable between 62 5mS and 256 seconds per LED column giving a maximum display period of between 1 875 seconds and 2 hours 13 minutes This information can be printed in the normal way MENU RESOLUTION AV PK MIC LINE 20dBu E ENTER QUIT PRINT RANGE 1 Ref Level Shows Ref level as in basic RTA mode 2 SLM Shows SLM readout as in basic RTA mode 3 Time Base Shows the
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11. allows up down control of menu selection when previewing menu Enter Confirms the chosen menu option and enters this as the working mode Resolution Selects the RTA display resolution to 1 or 2dB per LED Mode Selects between the three basic operating modes for the RT1 RTA No LED s light RT RT LED lights Sweep SW P LED lights Quit Returns unit to basic default operating mode from existing menu selection Response Selects average or peak response measurements for the main RTA display Freeze Holds RTA and SLM measurements The LED flashes until the freeze function is cancelled by pressing the freeze key again Print Holds display and prints current display information If no printer is connected No Printer is displayed on the LCD display See Printer section for detailed information Mic Line Selects mic or line input sources via independent XLR connectors Range Keys Set the operating reference for the RTA in 7 ranges from 50dBu to 10dBu with line source selected or 50spl to 110spl with microphone source selected Pressing both keys together selects auto range mode and lights the auto LED RT1 Page 3 15 Mic Input Microphone input XLR with phantom powering to suit XTA measurement microphone For convenience a second paralleled mic input connector is provided on the rear panel Only one mic input should be used at any time Rear Panel Functions 5x2 i
12. ctor using a standard cable The RT1 must first be set for the correct printer type using the Unit set up menu RT1 Page 14 With the printer then connected any current measurement or recalled memory can be printed by simply pressing the Print key Problems such as lack of paper or printer are described on the LCD window section for more information Specifications Automatic Time Date and Name labelling is provided See Unit Set up menu 1 3 Octave Display Number Weighting Time constants Display range Memories Number 30 x 1 3 octave band pass filters ANSI Type E Class 2 Relative filter flatness 0 8dB 1 x Overall level 20 20kHz 0 5dB IA or Tat filters 10 user selectable 7dB in 1dB resolution 14dB in 2dB attenuator setting resolution relative to input 32 addressable memories with 40 actual stores non volatile allowing true accumulation method for both RTA and RT60 modes Sound Level Meter Response modes Range Readout Display modes Weighting Frequency response Fast 1Sec and 8 Sec peak or average reading 54spl to 130spl Referenced to 93 8spl 15mV rms Mic input in 6 x 10dB ranges 4 digit LCD with overload and underange indication continuous or hold A or Tat filters 20 20kHz 0 6dB Meets requirements of IEC 651 1979 Preamplifier Attenuator Line impedance gt 10kohms Mic impedance gt 5kohms Bandw
13. e Manual adjustment nudging of centre frequency is also possible allowing problem frequencies to be identified using the SLM readout Although the RTA display has only one third octave resolution using the external printer or simply the SLM meter reading allows the full one twelfth octave resolution to be realised above 63Hz 1 6 octave below Sweep Ready Press mode key until SW P LED lights Pressing Quit whilst in sweep mode will always return the unit to this default mode unless a sweep is in progress Nous 20dBu MMMdBu SWEEP READY 1 Ref Level Shows the current reference level as selected via the range keys 2 SLM Shows level for line or mic input Note a low off scale reading may be shown since outputs are gated off 3 Option Keys Allow manual setting of measurement centre frequency Not used for auto sweeps RT1 Page 12 4 Enter Key Gates output on and initiates sweep after a wait period Sweep parameters are as previously set via the sweep menu The LCD display now shows the measurement centre frequency As discussed previously manual adjustments can be implemented at any time via the option keys Sweep Menu Options Output Mode Pres
14. e range keys 2 SLM Shows level for line or mic input 3 Frequency Shows RT centre frequency as selected by option keys Note O LEV indicates wideband measurements If a signal is present the centre frequency and level will show on the RTA display 4 Option Keys Selects RT centre frequency 5 Enter Key Gates output off and initiates RT measurement When the measurement is complete the unit will enter measurement mode 6 Quit Key Selects measurement mode to display last measurement RT60 Measurement Mode feed Fx CG 2 ie T menu OPTIONS v pK OOs OO OO 4KHz RT60 120mS AUTO WIN 480mS 5 OO re FX 4 Be PEN 4 D UT ue ur o e RANGE J Wii PONTS fs MEN 5 6 7 2 D O 1 Frequency Shows RT centre frequency used for the measurement 2 RT60 Time Shows the RT time calculated by the RT1 3 Window Status Shows the measurement window status as set by option key 1 Auto for automatic RT calculations Start to manually edit window start point End to manually edit window end point 4 RTA Display Time Shows the full scale horizontal axis time period for the RTA display This can be adjusted via option key 2 to
15. ed display shows dBA spA 2 SLM Sound pressure meter readout calibrated in dBu for line input and spl for mic input Note a with A weighting filter selected display shows dBA spA b with spl relative selected display shows dBr 3 Bar Decay Shows decay time for RTA bar column display 4 Peak Decay Shows decay time for RTA peak hold display 5 Option Key 1 Adjusts Bar decay time from 0 off to 5 slow 0 position is not available when peak hold decay is set at 0 off 6 Option Key 2 Adjusts Peak hold decay time from 0 off to infinite hold 0 position is not available when bar decay is set at 0 7 Enter Key Not used Notes The following additional options are available in this mode using the appropriate menu selection i A weighting filters on off for sound level meter ii A weighting filters on off for main RTA display iii SPL relative i e SLM displays difference in dB from a pre set reference level iii SLM mode can be set for Average or Peak reading with a choice of times RT1 Page 5 RTA Menu Options A weighting Press menu and select A weighting by using menu key or option keys Press Enter to load selection D
16. h of conventional devices Operational simplicity has not been sacrificed to implement this flexibility with intuitive controls and a clear menu driven LCD display allowing quick measurements to be made confidently The RT1 combines rugged construction for reliability on the road with the performance needed for the most demanding consultancy project Features Powerful analysis tool combining 1 3 octave RTA SPL meter RT analysis and a swept frequency analyser in one unique product Fully controllable pink noise and sine wave oscillator output sources included RTA features simultaneous Bar and Peak displays with separately adjustable time constants Accurate RT measurement using internally gated noise or external source Auto and manual window functions for direct RT measurement result Swept analysis measurements using tracking filters allow narrow band problems to be identified and plotted via the printer port Accurate SPL meter displays absolute or relative SPL with average or peak response Both RT and RTA modes each have 32 non volatile memories with accumulate function The RTA memories allow memory to memory compare and memory to real time compare difference functions Independently selectable A weighting filters for both 1 3 octave and SLM displays Crystal locked switched capacitor 1 3 octave filters for long term stability Printer port for directly driving industry standard printer
17. idth Mic phantom power Ranges Output Number Impedance Level Modes Ports Printer Computer 20 20kHz 0 5dB 15VDC 6 in 10dB steps Ref 10dBu to 40dBu 110spl to 60spl 1 electronically balanced gateable lt 60ohms source Adjustable 6dBu max via rear panel control Full bandwidth pink noise 1 octave band limited pink noise sine wave 25 20kHz Centronics compatible via 25 pin D shell connector RS 232 standard optional RS 422 via 9 pin D shell connector Power Requirements Consumption Voltage Physical Size Weight lt 40 VA 110 220V 15 50 60Hz 3 5 2U 19 11 5 88mm 482mm 290mm connectors excluding 6 2kg Net 8 2kg Shipping RT1 Page 15 Warranty This product is warranted against defects in components and workmanship only for a period of one year from the date of shipment to the end user During the warranty period XTA will at it s option either repair or replace products which prove to be defective provided that the product is returned shipping prepaid to an authorised XTA service facility Defects caused by unauthorised modifications misuse negligence act of God or accident or any use of this product that is not in accordance with the instructions provided by XTA are not covered by this warranty This warranty is exclusive and no other warranty is expressed or implied XTA is not liable for consequential damages RT1
18. r detailed information Mic Input identical to the front panel microphone input and connected in parallel Line Input This balanced input allows line level signals to be selected as the RTA input source when line is selected on the front panel The connector is a 3 pin female XLR type wired pin 2 Hot pin 3 Cold and pin 1 ground Output Pink noise and oscillator signal sources are provided within the RT1 and when selected are available via this 3 pin male XLR connector The output is balanced and wired pin 2 Hot pin 3 Cold and pin 1 ground RT1 Page 4 10 Output Level Controls the level of the output signal between oft and 6dB Operating the RT1 Basic RTA Mode This is the default mode for the unit and can be accessed at any time by pressing Quit assuming RTA is selected on the Mode key rs lt A We SE MENU OPTIONS v PK rOO2 OO OO 20dBu 3 5dBu DECAY BAR 2 PK 2 PN a hu TAs MODE FREEZ ow E 3 A ENTER En z SE B RE NS A 1 Ref Level Shows the current reference level as selected via the range keys The display reads dBu when line input is selected and spl for mic input Note with A weighting filter select
19. re The memory must be in effect erased by storing the first measurement using the Memory Store function then using the memory accumulate function for subsequent additions Memory Recall Press menu and select Memory Recall by using menu key or option keys Press Enter to load selection E KT MENU OPTIONS f RESOLUTION AV PK MIC LINE O O OO OO 20dBu 3 5dBu RECAL MEM 27 7 PN Ps p LT me ren GES ENTER FRENGE J 2 1 Ref Level Shows Ref level as in basic RTA mode 2 SLM Shows SLM readout as in basic RTA mode 3 Mem No Shows memory number selected via option keys 4 Accumulations Shows the number of accumulations made into the current memory location 5 Option Keys Selects memory location number from 1 to 32 RT1 Page 8 6 Enter Key Not used Memory Compare Press menu and select Memory Compare by using menu key or option keys Press Enter to load selection This function allows the information in two memories to be compared and the resultant difference curve to shown on the main RTA display
20. s allows permanent copies of any display curve to be made with user selectable title and automatic time and date stamp Time Level mode displays historical information on peak levels attained Mic and Line inputs with mic inputs on front and rear panel The LED bar graph display has selectable average and peak response with switchable resolution of 1 or 2dB per LED Manual and Auto range control of input attenuator setting RS 232 computer port provided RS 422 option available A high quality measurement microphone is included with each unit RT1 Page 1 Thanks Thank you for choosing the XTA RT1 for your application Please spare a little time to digest the contents of this manual figuratively speaking so that you obtain the best possible performance from this unit All XTA products are carefully engineered for world class performance and reliability If you would like further information on this or any other XTA product please call us We look forward to helping in the near future XTA Electronics Ltd Safety Warnings Please note the following information which is provided for your safety m Check correct operating voltage is set on the power supply before connecting mains power Do not expose this unit to rain or moisture Do not expose this unit to excessive heat Replace all fuses with correct type only Do not remove the covers from this unit No user serviceable parts inside refer all
21. s memory number selected via option keys after the number identifies a memory previously used 4 Option Keys Selects memory location number from 1 to 32 5 Enter Key Loads current display information into memory currently selected RT1 Page 7 Memory Accumulate Press menu and select Memory Accum by using menu key or option keys Press Enter to load selection KC KE MENU OPTIONS I j RESOLUTION AV PK MIC LINE O02 OO OO 20dBu 3 5dBu ACCUM MEM 1 5 lt lt PN a a r j C me ren Om Kf 3 VA ENTER QUT PRINT RANCE J SE A 1 Ref Level Shows Ref level as in basic RTA mode 2 SLM Shows SLM readout as in basic RTA mode 3 Mem No Shows memory number selected via option keys 4 Accumulations Shows the number of accumulations made into the current memory location 5 Option Keys Selects memory location number from 1 to 32 6 Enter Key Adds present information to any previous accumulation loaded into the current memory location Note If new measurements are to be accumulated into a memory location that has previous accumulations i e 4 above displays 1 or mo
22. s menu and select Output Mode by using menu key or option keys Press Enter to load selection MENU OPTIONS OUTPUT MODE B W PINK NOISE m R ES PRINT RANGE es 1 Output mode Displays current output mode i B W Pink Noise Band limited Pink Noise ii Sine wave 2 Option Keys Toggle between the two output modes Sweep Start Frequency Press menu and select Sweep start freq by using menu key or option keys Press Enter to load selection SWEEP START FREQ 1 Start Frequency Shows the current sweep start frequency 2 Option Keys Set Sweep start frequency Sweep End Frequency Press menu and select Sweep End freq by using menu key or option keys Press Enter to load selection This option operates as Start Frequency above RT1 Page 13 Sweep Speed Press menu and select Sweep Speed by using menu key or option keys Press Enter to load selection MENU OPTIONS
23. sing menu key or option keys Press Enter to load selection ATX D L 1 LS 1 T RESOLUTION av PK MC LINE 0025 OO OO 204Bu EH SLM AVG 1 SEC OC ES Ae a a LLJ wove res o e SN lt 5 LW T FANGE ENTER SE EN 1 Ref Level Shows Ref level as in basic RTA mode 2 SLM Shows SLM readout as in basic RTA mode 3 SLM Mode Displays current SLM mode Average AVG or Peak reading 4 Response Displays response time for SLM instantaneous INST 1 Sec or 8 Secs 5 Option Key 1 Selects SLM mode 6 Option Key 2 Selects SLM response time 7 Enter Key Not used Memory Store Press menu and select Memory Store by using menu key or option keys Press Enter to load selection a oN 1 2 Le av PK OOs OO OO u PN a gt K Go e SC 4 QUIT RANGE ay JE EE PES FT d 1 Ref Level Shows Ref level as in basic RTA mode 2 SLM Shows SLM readout as in basic RTA mode 3 Mem No Show
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