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Rion NA-42, Instruction Manual

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Rion NA-42 Instruction Manual Download Page 47

37

Measurement

When the unit is turned on, the same settings as used before the unit was 

turned off are reestablished (resume function), and measurement starts.

After turning on the unit, wait at least 2 minutes to let the circuits stabilize, 

and start measurement only after calibration was completed.

L

max

function

L

peak

function

Level range

High-pass filter

Low-pass filter

Microphone sensitivity

Menu 1 contents

Menu 3 to 5 contents

Frequency weighting

Time weighting

External filter

Calibration

Backlight status

Menu setting status

Comparator status

Remote status

Settings memorized by
resume function

Settings not memorized by
resume function

Bar graph display range

(20 dB/50 dB)

Microphone sensitivity
setting status

Summary of Contents for NA-42

Page 1: ...3 20 41 Higashimotomachi Kokubunji Tokyo 185 8533 Japan http www rion co jp english INSTRUCTION MANUAL Sound Level Measuring Amplifier NA 42...

Page 2: ......

Page 3: ...s Describes installation connections inserting batteries pre use checks and other steps Measurement Describes the steps for measurement Comparator Describes how to use the comparator function Serial I...

Page 4: ...ii To conform to the EU requirement of the Directive 2002 96 EC on Waste Electrical and Electronic Equipment the symbol mark on the right is shown on the instrument...

Page 5: ...equipment make sure that all instructions are fully understood and observed Caution Important Disregarding instructions printed here incurs the risk of injury to persons and or dam age to peripheral...

Page 6: ...nit if it is not to be used for a long time When disconnecting cables always grasp the plug and do not pull the cable Before using the microphone and before putting it away always check that the micro...

Page 7: ...v Caution Some pins of the INPUT connector carry a high voltage To prevent the risk of electric shock never insert a metal clip or any other pointed object into the input connector...

Page 8: ...e and Preamplifier Connection 15 Calibration 20 1 Electrical calibration 20 2 Calibration with pistonphone NC 72 or sound calibrator NC 74 24 3 Insert CAL calibration 29 Using a Tripod 33 Using a Wind...

Page 9: ...Mode 63 Command Format 64 Commands 67 Communication With Multiple Units Using SC 31 78 Technical Reference 81 Microphone and Preamplifier Selection 81 Microphone 85 Preamplifier 88 Insert CAL 89 Exte...

Page 10: ...viii...

Page 11: ...ther measurement modes allow determining maximum values for sound pressure level as well as peak SPL Measurement result readout resolution can be switched to one or two decimal points and the large LC...

Page 12: ...0 dB AMP 10 dB AMP 20 dB AMP 10 dB AMP 20 dB AMP 10 dB LCD DRIVER HPF 20 Hz LPF 20 kHz ATT 10 dB AMP CAL ADJ Antialiasing filter Connector E Input CAL signal External filter Microphone bias voltage Po...

Page 13: ...Gain Diagram 140 130 120 110 100 90 80 70 ATT 0 dB 10 dB 20 dB AMP 0 dB 10 dB 20 dB AMP 0 dB 10 dB 20 dB AMP 0 dB 10 dB Example Sensitivity 29 9 to 20 0 Level range dB Adjustment by CAL ADJ Span of ad...

Page 14: ...ange between 20 and 50 dB CAL key Activates the built in oscillator for electrical calibration SOUND LEVEL MEASURING AMPLIFIER HPF LPF LEVEL RANGE CAL 20dB 50dB POWER EXT FILTER RESET Lp Lmax Lpeak ON...

Page 15: ...ternal filter on and off RESET key The function of this key depends on the current operation mode of the unit When set to sound level maximum Lmax Resets the currently held measurement value When set...

Page 16: ...on batteries the backlight is automatically turned off after 10 minutes Switching power on while holding down the MENU LIGHT key calls up the software version INPUT connector The microphone preamplif...

Page 17: ...microphone sensi tivity The setting range is 69 99 to 10 00 dB Use the setting up down keys to adjust the setting The setting resolution is one decimal point when the readout resolution is set to 0 1...

Page 18: ...output impedance is 600 DC OUT connector A DC signal corresponding to the measured value is supplied at this connector The scale range is 6 V 1 V 10 dB and output impedance is 50 SERIAL COMP OUT 12V...

Page 19: ...V or 45 V as power supply voltage for a connected pream plifier The default setting is 12 V Preamplifiers compatible with both 12 V and 45 V NH 01 NH 04 NH 05 NH 11 NH 12 NH 14 NH 16 NH 17 NH 17A NH...

Page 20: ...alibration value is shown here The value is 6 dB below the level range maximum In other operation modes the indi cation P20 is shown here if preamplifier gain was set to 20 dB with a menu selection Us...

Page 21: ...xternal filter is used LPF 20 kHz is shown here if the low pass filter is activated HPF 20 Hz is shown here if the high pass filter is activated Frequency weighting The selected frequency weighting ch...

Page 22: ...dB the value shown here corresponds to level range 20 dB UNDER Appears when the input signal has fallen to more than 50 5 dB below the selected level range value Battery indicator Shows the remaining...

Page 23: ...the battery holder button again Important While inserting or removing batteries support the battery holder by hand Take care not to insert batteries with wrong polarity While not using the unit the ba...

Page 24: ...ge is set to 45 V current consump tion increases by 70 During use of the serial interface current consumption increases by 5 Remaining battery capacity indication The following indication appears on t...

Page 25: ...V If wishing to set the selector to 45 V first make sure that the preamplifier microphone is compatible with this voltage Preamplifiers compatible with both 12 V and 45 V NH 01 NH 04 NH 05 NH 11 NH 12...

Page 26: ...Then connect the preamplifier to the NA 42 with the cable of the preamplifier If you want to extend the cable use the optional condenser micro phone extension cable series EC 04 3 Turn power to the N...

Page 27: ...ency response may be impaired 2 Confirm that the NA 42 is turned off and that the PREAMP power selector on the rear panel is set to 12 V Important The preamplifier NH 34 is not compatible with 45 V Ma...

Page 28: ...r gain is set to 20 dB the lower mea surement limit will be 20 dB less than for the 0 dB setting allowing measurement of lower levels only when using UC 34P 5 Proceed to Calibration on page 20 EC 04 E...

Page 29: ...that the NA 42 is turned off Then connect the preamplifier to the NA 42 with the cable of the preamplifier If you want to extend the cable use the optional condenser micro phone extension cable serie...

Page 30: ...e circuits stabi lize 1 Electrical calibration The unit can be calibrated using the built in signal generator 1 kHz sine wave signal Microphone sensitivity adjustment 1 Turn the unit on 2 Press the SE...

Page 31: ...33 2 33 20 CALIBRATION CHART FOR CONDENSER MICROPHONE UC 52 dB Open Circuit Sensitivity 32 9 dB 0dB 1Volt Pa 22 6 mV Pa Cartridge Capacitance 17 6 pF Leakage Resistance 10 12 at Relative Humidity 85 C...

Page 32: ...of 20 dB is available only when the UC 34P UC 34 NH 34 is connected 6 Press the CAL key to activate the calibration mode Measurement parameters are automatically set to C weighting and FAST 0 dB 20 dB...

Page 33: ...d screwdriver to adjust the sensitivity control on the front panel to the calibration value under 6 dB of the level range value CAL FAST C Calibration Value Level range value Measurement value Calibra...

Page 34: ...and from the pistonphone NC 72 or sound calibra tor NC 74 very slowly and carefully since the pressure change could otherwise damage the diaphragm of the microphone 1 Turn power to the pistonphone NC...

Page 35: ...ATION CHART FOR CONDENSER MICROPHONE UC 52 dB Open Circuit Sensitivity 32 9 dB 0dB 1Volt Pa 22 6 mV Pa Cartridge Capacitance 17 6 pF Leakage Resistance 10 12 at Relative Humidity 85 Conditions of Test...

Page 36: ...adapter is not required Note For 1 4 inch microphones the pistonphone NC 72 comes with a 1 4 inch adapter There is no 1 4 inch adapter for the NC 74 8 Insert the microphone very carefully and slowly...

Page 37: ...pistonphone 11 Turn power to the NA 42 and pistonphone NC 72 or sound calibrator NC 74 off 12 Remove the microphone very carefully and slowly from the cou pler UC 11 UC 27 UC 34 UC 26 UC 30 UC 31 UC 5...

Page 38: ...C 72 The NC 74 is designed to produce 94 0 dB under its rated conditions but in actual calibration the sound field compensation value which depends on the sound level meter must be taken into consider...

Page 39: ...en p 47 4 On menu 3 select the setting ON with the setting up down keys 5 Press the MENU LIGHT key several times to return to the mea surement screen 6 Press the SENS key on the front panel 7 Use the...

Page 40: ...utomatically set to C weighting and FAST 9 Use the supplied screwdriver to adjust the sensitivity control on the front panel to the calibration value 94 0 dB in the example shown above CAL FAST C INSE...

Page 41: ...r the level range 120 dB 1 Before making any connections turn power to the NA 42 and to the external device off Then connect the device and turn power on SERIAL COMP OUT 12V 45V PREAMP A COM LOCK UNLO...

Page 42: ...ate the external device Using the level recorder LR 04 LR 06 LR 07 LR 20A Use the level control on the level recorder to adjust the pen posi tion In this example the level range is 120 dB and the meas...

Page 43: ...older UA 90 NH 17 NH 11 NH 12 EC03001 NH 01 NH 04 NH 05 NH 06 NH 34 The EC03001 is supplied with the condenser microphones EC 04 EC 04A and EC 04B EC03001 Microphone preamplifier Connector Microphone...

Page 44: ...nt errors To prevent this an optional windscreen can be mounted to the microphone For details on the effect of the windscreen upon the measurement please refer to Technical Reference page 92 Available...

Page 45: ...eet The unit can be tilted by flipping out the prop up feet Tilt the feet until they snap in place Important When using the prop up feet do not place objects on top of the NA 42 and do not push down o...

Page 46: ...et to 12 V If wishing to set the selector to 45 V first make sure that the preamplifier microphone is compatible with this voltage Preamplifiers compatible with both 12 V and 45 V NH 01 NH 04 NH 05 NH...

Page 47: ...only after calibration was completed Lmax function Lpeak function Level range High pass filter Low pass filter Microphone sensitivity Menu 1 contents Menu 3 to 5 contents Frequency weighting Time wei...

Page 48: ...s available only when the UC 34P UC 34 NH 34 is used 0 dB 20 dB 19 99 to 10 00 60 70 80 90 100 110 120 130 29 99 to 20 00 70 80 90 100 110 120 130 140 39 99 to 30 00 80 90 100 110 120 130 140 150 49 9...

Page 49: ...ty select the FLAT setting Depending on the microphone in use frequencies up to 100 kHz can be measured With the C setting frequency response is almost flat but the influence of frequency components b...

Page 50: ...ach push of the key cycles through the following settings FAST SLOW IMP FAST For normal measurements the FAST setting should be used SOUND LEVEL MEASURING AMPLIFIER HPF LPF LEVEL RANGE CAL 20dB 50dB P...

Page 51: ...display 2 When the Lmax function is selected the highest sound level is held on the display When a higher level is input the display is updated 3 When overload has occurred the indication MAX OVER is...

Page 52: ...held using 250 kHz sampling SOUND LEVEL MEASURING AMPLIFIER HPF LPF LEVEL RANGE CAL 20dB 50dB POWER EXT FILTER RESET Lp Lmax Lpeak ON INPUT NA 42 ADJ FAST SENS MENU A C FLAT SLOW IMP LIGHT 20Hz 20kHz...

Page 53: ...r a higher value is input 3 If the hold value has caused overload PEAK OVER is shown 4 The RESET key can be used to reset the hold value OVER SLOW A PEAK SOUND LEVEL MEASURING AMPLIFIER HPF LPF LEVEL...

Page 54: ...20 kHz are sharply attenuated For details on low pass filter characteristics please refer to Technical Refer ence page 95 FAST Hz kHz FLAT SOUND LEVEL MEASURING AMPLIFIER HPF LPF LEVEL RANGE CAL 20dB...

Page 55: ...20 Hz are sharply attenuated For details on high pass filter characteristics please refer to Technical Ref erence page 95 FAST Hz kHz FLAT SOUND LEVEL MEASURING AMPLIFIER HPF LPF LEVEL RANGE CAL 20dB...

Page 56: ...e following settings 20 dB 50 dB 20 dB etc 20 dB range bar graph display resolution is 0 4 dB 50 dB range bar graph display resolution is 1 dB The bar graph update interval is 100 ms FAST C SOUND LEVE...

Page 57: ...will not bring up the menu when the unit is in calibration mode mi crophone sensitivity setting mode Lmax measurement mode Lpeak measurement mode or remote mode 2 When the menu is activated the follow...

Page 58: ...4 2 measurement screen 1 Appear when 9600 or 19200 was set with menu 4 0 2 Appear when menu 5 0 is set to ON 3 Select the desired menu with the MENU LIGHT key and change the flashing setting with the...

Page 59: ...ifier for Insert CAL is connected Dedicated preamplifier for Insert CAL is used Preamplifier other than dedicated preamplifier for Insert CAL is used This is the normal setting About Insert CAL When I...

Page 60: ...the 19200 setting Note When serial communication is not used a setting of 9600 or 19200 will not affect the measurement but current consumption will increase by 5 Menu 4 1 Allows setting the ID number...

Page 61: ...n 1 dB steps Menu 5 2 Sets the comparator delay time The comparator delay time setting range is 0 to 9 seconds in 1 second steps Menu 5 3 Sets the comparator auto reset function to ON or OFF Comparato...

Page 62: ...gnal through the external filter SERIAL COMP OUT 12V 45V PREAMP A COM LOCK UNLOCK BATT BOX AC OUT DC OUT EXT 6V TO FILTER FROM FILTER EXT FILTER Connect to input of external filter Connect to output o...

Page 63: ...rk locations Note When the unit is running on batteries the backlight is automatically turned off after 10 minutes When the batteries are nearly exhausted the bright ness of the backlight will decreas...

Page 64: ...es to monitor the sound pressure level picked up by the microphone by comparing it with a preset level When the preset level is exceeded the comparator output becomes active Note The comparator functi...

Page 65: ...ph scale lights up Note Set the comparator level between the upper limit of the selected level range and 50 dB If the comparator level is set to a value outside of this range correct operation is not...

Page 66: ...mparator function is turned off Auto reset time The auto reset time is set with menu 5 4 Menu Settings p 51 This is the time between triggering of the comparator output and automatic reset The setting...

Page 67: ...menu 5 0 With this method the comparator output is reset by setting the comparator function to OFF With methods 1 and 2 the comparator function stays ON while method 3 returns the unit to the normal...

Page 68: ...e computer Using SC 31M or SC 31S adapters option a single computer can be used to control up to 16 NA 42 units Transfer Protocol Transfer principle asynchronous half duplex Data word length 8 bit Sto...

Page 69: ...he NA 42 when the unit is in remote mode Switching between local mode and remote mode The RMT command is used to switch between local mode and remote mode Preparation 1 Turn power to the NA 42 and the...

Page 70: ...Deactivates serial communication or selects one of two speeds Menu 4 1 Sets the ID number Menu 4 2 Sets the use status of SC 31M SC 31S Note ID number The ID number serves to identify the NA 42 unit w...

Page 71: ...ter sends RMT1 CR LF to the NA 42 2 When RMT1 CR LF has been received the NA 42 returns ACK READY CR LF to the computer The link is now estab lished and the indication REMOTE appears on the display of...

Page 72: ...ontrol code 04H end of transfer READY ASCII string command ASCII string command and parameters data ASCII string data requested by command Link established Setting command Data request command Link te...

Page 73: ...rface cable is defective or not properly connected NA 42 is not powered ID number setting does not match When the computer has sent a wrong command or the parameter is out of range the NA 42 disregard...

Page 74: ...r changing function settings Parameter for requesting data The parameters for changing function settings are numerals and the parameter for requesting data is In the following command description the...

Page 75: ...ghting Get time weighting setting Set frequency weighting Get frequency weighting setting Set sensitivity Get sensitivity setting Set low pass filter setting Get low pass filter setting Set high pass...

Page 76: ...unction settings Get comparator function settings Get version information Set preamplifier gain to 0 dB 20 dB Get preamplifier gain and setting of rear panel PREAMP power selector Set Insert CAL Get I...

Page 77: ...ected NA 42 To send a setting command to all connected NA 42 units when using the SC 31M SC 31S use n2n3 FF RMT Get ID number and remote mode status Output data format p1 p2 p3 EOT CR LF p1 p2 is ID n...

Page 78: ...weighting n 1 C weighting n 2 FLAT response WGT Get time frequency weighting setting Output data format p EOT CR LF p corresponds to n of WGT SNS n1 n2 n3 n4 n5 Set sensitivity n1 n2 n4 n5 Setting ran...

Page 79: ...PF n Set low pass filter setting n 0 OFF n 1 20 kHz LPF Get low pass filter setting Output data format p EOT CR LF p corresponds to n of LPF HPF n Set high pass filter setting n 0 OFF n 1 20 Hz HPF Ge...

Page 80: ...ormat p EOT CR LF p 0 Flashing p 1 1 segment lit p 2 2 segments lit p 3 3 segments lit DOD Get measurement data Returns a value corresponding to the display indication Output data format When readout...

Page 81: ...derload occurred When operating in Lmax mode the Lmax value is returned The same applies for Lpeak DOF n Output instantaneous value every 0 1 seconds in non protocol mode n 0 Instantaneous value outpu...

Page 82: ...k sound pressure level function to On Off n 0 Lpeak OFF n 1 Lpeak ON PEK Get Lpeak function status Output data format p EOT CR LF p 0 Lpeak OFF p 1 Lpeak active RST Reset hold value This command is ac...

Page 83: ...ttings n4 Delay time 0 to 9 n5 0 Auto reset OFF n5 1 Auto reset ON n6 to n7 Auto reset time 00 to 90 steps of 1 For items that are not to be changed send _ space CMS Get comparator function settings O...

Page 84: ...utput data format p EOT CR LF p corresponds to n of INS BARn Set bar graph display width n 0 50 dB n 1 20 dB BAR Get bar graph display width Output data format p EOT CR LF p corresponds to n of BAR DC...

Page 85: ...1AH Note Because this unit supports only half duplex commu nication it cannot receive and send data at the same time When sending the SUB or DOF0 command to the unit the computer must use timing whic...

Page 86: ...PREn Command Calibration Comparator DOF operation Normal measurement Content Others related commands Content Data related commands Content Front panel key related commands Content Menu related command...

Page 87: ...LPF HPF EXT MAX PEK SNS CAL BAR CMP CMS DCT INS PRE Lmax Lpeak Command Calibration Comparator DOF operation Content Others related commands with Content Front panel key related commands with Content M...

Page 88: ...10BaseT cable Maximum allowable wiring distance 400 m Note 1 When multiple units are connected commands can be sent either to a single unit or all units It is not possible to send for example a comman...

Page 89: ...at you want to control 3 Use the necessary setting commands or data request commands to control the NA 42 unit whose ID number was specified in the previ ous step 4 Send the RMT0 command from the comp...

Page 90: ...T0FF command from the computer to set all NA 42 units to local mode link terminated To use data request commands or to change the settings of one unit only follow the steps described in Sending comman...

Page 91: ...46 dB 10 to 112 dB 50 to 164 dB 20 to 145 dB 34 to 155 dB 10 to 20 k 20 to 8 k 10 to 12 5 k 20 to 100 k 5 to 12 5 k 10 to 35 k 28 33 21 47 26 5 37 Type Linear operation range Frequency range Hz Nomina...

Page 92: ...NC 72 NC 73 NC 74 UA 30 WS 01 UC 24 UC 27 UC 32P UA 10 MODE L NC 74 S ER No RION CO LTD MADE IN J APA N MODE L NC 74 S ER No RION CO LTD MADE IN J APA N NC 74 NC 74 002 Microphone preamplifier combina...

Page 93: ...04B 10 m 20Hz 20kHz NA 42 EC 04C 30 5 m EC 04D 50 5 m EC 04E 100 5 m Flexible rod Preamplifier Extension cable Multiple extension cables can be combined up to a maximum total of 100 m SOUND LEVEL MEA...

Page 94: ...ear operation range The linear operation range depends on the microphone as shown in the graph below The linear operation range applies to A weighting without overload margin 1 10 100 1 k UC 24 100 k...

Page 95: ...a change in capacitance To convert this change into an electrical signal a DC voltage DC bias of normally 200 V is supplied to the backplate via a high value resistor and the voltage difference betwee...

Page 96: ...are of the overall noise components and internal noise does not pose a problem But in combination with the high impedance preamplifier NH 34 electrical noise in the UC 34 is greatly reduced and intern...

Page 97: ...causing very high level noise spikes Such a surface resistance drop is often due to contamination or humidity Therefore the microphone should always be placed in its stor age case when not in use and...

Page 98: ...directly after the microphone and is designed for high input impedance and low output impedance Equation 1 fo Low range cut off frequency Zin Preamplifier input impedance Cm Microphone static capacit...

Page 99: ...put impedance and input capacitance of 0 When calibrating the unit with an electrical signal the microphone sensitiv ity minus a representative value for preamplifier loss is taken as microphone sensi...

Page 100: ...put impedance and upper measure ment frequency limit is shown in the figure below and the correlation between cable capacitance and measurement sound pressure level and measurement frequency is shown...

Page 101: ...0 110 90 140 120 100 80 135 115 95 75 20 0 20 40 100 200 500 1 k 2 k 5 k 10 k 20 k 50 k 100 k 0 1 F 500 m 40 nF 200 m 20 nF 100 m 10 nF 50 m 4 nF 20 m 2 nF 10 m 1 nF 5 m 500 pF 2 5 m Frequency Hz Prea...

Page 102: ...el The influence of the windscreens on the acoustical properties of the micro phone is within 1 0 dB up to 12 5 kHz as shown in the figures on the lower part of the next page 100 90 80 70 60 50 40 30...

Page 103: ...20 30 50 70 100 200 300 600700 1 k 15 m s 10 m s 5 m s 1 3 octave band sound pressure level dB With WS 01 Frequency Hz 90 80 70 60 50 40 20 30 50 70 100 200 300 600700 1 k 15 m s 10 m s 5 m s 1 3 oct...

Page 104: ...s less than 10 dB the values shown in the table below may be used for compensa tion to estimate the level of the target sound If for example the measured noise level when operating a machine is 70 dB...

Page 105: ...dness For this reason this type of frequency weighting is widely used for purposes such as noise level evaluation With the FLAT characteristic frequency response is linear which is suitable for straig...

Page 106: ...0 V DC microphone bias voltage The function of pin E depends on the setup of the unit Caution To prevent the risk of electric shock never insert a metal clip or any other pointed object into the input...

Page 107: ...over time is raised to the power of 2 and integra tion for the time interval T is performed The result is divided by T and the square root is extracted The circuit configuration for performing the abo...

Page 108: ...han in the slow setting From the point of view of the measurement objective the FAST setting is more suitable to situations with swiftly changing noise level whereas the SLOW setting yields a more bro...

Page 109: ...quals CR ei Input voltage proportional to square of sound pressure eo Output voltage The response of the index averaging circuit to a single burst signal is shown below FAST 125 ms 125 ms 1 s 1 s SLOW...

Page 110: ...lt settings Level range upper limit 120 dB Frequency weighting A Time weighting FAST Microphone sensitivity 29 9 dB Bar graph display range 50 dB HPF 20 Hz OFF LPF 20 kHz OFF External filter OFF Menu...

Page 111: ...hen hold down the MENU LIGHT key while turning the power on The software version is shown in the measurement value field Rack Mounting The unit can be mounted in a rack using the four screw holes on t...

Page 112: ...o the computer for display and the software also allows storing measurement data in CSV format suitable for further processing for example with a spreadsheet application In conjunction with the option...

Page 113: ...103 Technical Reference Main menu screen Measurement screen...

Page 114: ...operation range applies to A weighting without overload mar gin The Linearity range values given in the above table are guaranteed for all microphones of the indicated type When wider linear operatio...

Page 115: ...B 20 dB 19 99 to 10 00 60 70 80 90 100 110 120 130 29 99 to 20 00 70 80 90 100 110 120 130 140 39 99 to 30 00 80 90 100 110 120 130 140 150 49 99 to 40 00 90 100 110 120 130 140 150 160 59 99 to 50 00...

Page 116: ...ctrical calibration using 1 kHz sine wave signal produced by internal oscillator Insert CAL function possible with dedicated preamplifier NH 08 Microphone sensitivity 69 99 dB to 10 00 dB Polarizing v...

Page 117: ...lex Stop bits 2 Parity None Multi channelconfigurationusingMulti ChannelAdapterSC 31M SC 31S possible up to 16 channels maximum distance 400 m Comparator function Sound pressure level evaluating compa...

Page 118: ...ce readout resolution Bar graph Scale range 50 dB or 20 dB update interval 0 1 s Warning indications OVER overload triggered at about 10 dB from full scale point UNDER underload triggered at about 50...

Page 119: ...C 6 V Approx 220 mA Measurement conditions UC 53A NH 17 connected preamplifier power supply 12 V backlight OFF serial communication OFF When backlight is ON current consumption in creases by about 15...

Page 120: ...essories External input adapter UA 01 Condenser microphones Preamplifiers Condenser microphone cable EC 04 series Pistonphone NC 72 Sound calibrator NC 74 Preamplifier for vibration measurements VP 26...

Page 121: ...W IMP 20Hz 20kHz 171 120 SERIAL COMP OUT 12V 45V PREAMP A COM LOCK UNLOCK BATT BOX AC OUT DC OUT EXT 6V TO FILTER FROM FILTER EXT FILTER 236 SOUND LEVEL MEASURING AMPLIFIER MODEL NA 42 SER NO Fitting...

Page 122: ...No 32342 06 12 Printed in Japan...

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