{"title":"Calibration equipment","description":"\u003cp\u003eCalibration is an essential step in every precision measurement. It establishes the relationship between the sound pressure and the electrical output of the microphone.\u003c\/p\u003e\n\u003cp\u003eCalibration can be performed at either 250 Hz or at 1 kHz. Both frequencies have their advantages and disadvantages.\u003c\/p\u003e","products":[{"product_id":"gras-14aaelectrostatic-actuator-amplifier","title":"GRAS 14AA Electrostatic Actuator Amplifier","description":"The input to the 14AA is via a standard BNC socket on the front panel and any input signal up to 3 V peak-to-peak can be applied. This is then amplified by 40 dB to produce an AC output signal of up to 300 V peak-to-peak maximum. This AC output signal is also made available superimposed on + 200 V DC and + 800 V DC. This amounts to three parallel signal outputs available via sockets on the front panel marked as follows:","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310154232141,"sku":"14AA","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/14AA_HiRes-RGB.png?v=1701173192"},{"product_id":"gras-26ag1-2-insert-voltage-preamplifier-with-integrated-connector","title":"GRAS 26AG 1\/2'' Insert Voltage Preamplifier with Integrated Connector","description":"All GRAS microphone preamplifiers are based on a small ceramic thick film substrate with a very high input impedance. The ceramic substrate is shielded by a guard ring to minimise the influence of stray capacitance and microphonic interference. The casing is made of stainless steel for maximum strength and durability. The small dimensions of the 26AG preamplifier ensures reliable operation under humid conditions owing to the heat generated by internal power dissipation.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310154494285,"sku":"26AG","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/26AG_HiRes-RGB.png?v=1701173202"},{"product_id":"gras-26an1-4-insert-voltage-preamplifier","title":"GRAS 26AN 1\/4'' Insert Voltage Preamplifier","description":"GRAS 26AN can handle both single and dual-sided power supplies. The supply can vary between 28 VDC and 120 VDC single-sided or ±14VDC and ±60 VDC dual-sided. When using the high supply voltage (120VDC or ±60VDC), the dynamic range exceeds 140 dB.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310154658125,"sku":"26AN","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/26AN_HiRes-RGB.png?v=1701173208"},{"product_id":"gras-42aapistonphone-class-1","title":"GRAS 42AA Pistonphone, Class 1","description":"The 42AA is an extremely stable laboratory standard sound source which can also be used for field calibrations – it retains its high accuracy even under hostile environmental conditions.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310155084109,"sku":"42AA","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/42AA_HiRes-RGB.png?v=1701173214"},{"product_id":"gras-42acpistonphone-high-pressure-class-1","title":"GRAS 42AC Pistonphone, high pressure, Class 1","description":"The 42AC is an extremely stable laboratory standard sound source which can also be used for field calibrations – it retains its high accuracy even under hostile environmental conditions. The 42AC complies with all the requirements of IEC Standard 942 (1988) Sound Calibrators Class 1 when corrected with barometer ZC0003K (included). The 42AC is delivered with a ½\" coupler (RA0048) for calibrating ½\" microphones directly. The 42AC-S2 is a version of the 42AC that is delivered with a 1\" coupler (RA0023) for calibrating 1\" microphones directly.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310155215181,"sku":"42AC","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/42AC_HiRes-RGB.png?v=1701173221"},{"product_id":"gras-42aelow-frequency-calibrator","title":"GRAS 42AE Low Frequency Calibrator","description":"The calibrator can be used for both rear-vented and side-vented microphones. In the case of rear-vented microphones, the 42AE can seal the microphone from the preamplifier to obtain the response of the microphone independent of other leaks.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310157017421,"sku":"42AE","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/42AE_a_HiRes-RGB.png?v=1701173228"},{"product_id":"gras-42agmultifunction-sound-calibrator-class-1","title":"GRAS 42AG Multifunction Sound Calibrator, Class 1","description":"The GRAS 42AG Multifunction Sound Calibrator is a portable, battery operated sound source for calibration and check of microphones and sound level meters. It is designed for field use and comes with a protective casing. It conforms to the requirements in IEC 60942 for a class 1 sound calibrator.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310157443405,"sku":"42AG","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/42AG_b_1kHz-114dB_HiRes-RGB.png?v=1701173234"},{"product_id":"gras-42apintelligent-pistonphone-class-0","title":"GRAS 42AP Intelligent Pistonphone Class 0","description":"42AP has a built-in precision barometer and a thermometer. Via its display and RS-232 interface, the user can read the actual corrected sound pressure level, as well as the pistonphone’s temperature and ambient static pressure.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310157836621,"sku":"42AP","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/42AP_HiRes-RGB.png?v=1701173241"},{"product_id":"gras-51abphase-calibrator-according-to-iec-61043","title":"GRAS 51AB Phase Calibrator according to IEC 61043","description":"The GRAS 51AB can be connected to an external signal generator producing white noise, pink noise or pure tones.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310157934925,"sku":"51AB","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/51AB_HiRes-RGB.png?v=1701173247"},{"product_id":"gras-51acsound-intensity-calibration-kit","title":"GRAS 51AC Sound Intensity Calibration Kit","description":"The 51AC Sound Intensity Calibration Kit provides a convenient calibration method for GRAS 50AI-LP, 50GI-RP, and 50GI-P CCP Rugged Intensity Probes","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310158098765,"sku":"51AC","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/51ac.png?v=1701173254"},{"product_id":"gras-90aaaudiometer-calibration-system","title":"GRAS 90AA Audiometer Calibration System","description":"The GRAS 90AA Audiometer Calibration System is configured to meet the requirements of modern audio-meter calibration. It is easy and fast to set up and control, and can be upgraded as your calibration needs change.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310158197069,"sku":"90AA","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/90AA_a_HiRes-RGB.png?v=1701173261"},{"product_id":"gras-90abbasic-audiometer-calibration-system","title":"GRAS 90AB Basic Audiometer Calibration System","description":"The GRAS 90AB Basic Audiometer Calibration system is configured for the stationary calibration lab and will also calibrate supra- and circum-aural audiometric earphones like TDH-39, HDA 200, HDA280 and HDA 300.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310158360909,"sku":"90CA","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/90ab.png?v=1701173268"},{"product_id":"gras-90ca-s2microphone-calibration-system-pxi","title":"GRAS 90CA-S2 Microphone Calibration System, PXI","description":"The GRAS 90CA-S2 Microphone Calibration System provides for automated and reliable level and frequency response calibration of measurement microphones. The implemented calibration methods conform with these standards:","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310158917965,"sku":"90CA-S2","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/90CA_HiRes-RGB.png?v=1701173274"},{"product_id":"gras-op0024kit-for-frequency-calibration-of-flush-mount-microphone-sets","title":"GRAS OP0024 Kit for Frequency Calibration of Flush-mount Microphone Sets","description":"For frequency calibration of GRAS flush-mount microphone sets, you will in addition to a GRAS 14AA Electrostatic Actuator Amplifier need an Electrostatic Actuator, an Actuator Calibration Holder and an adapter for each microphone size. This kit contains these additional items.i.e. actuator, holder and adapters for 1\/8\" and 1\/4\" sizes. For 1\/2\" no adapter is used.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310159409485,"sku":"OP0024","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/OP0024.png?v=1701173281"},{"product_id":"gras-op0026kit-for-frequency-calibration-of-1-4-surface-microphones","title":"GRAS OP0026 Kit for Frequency Calibration of 1\/4\" Surface Microphones","description":"For frequency calibration of GRAS 1\/4\" precision surface microphones, you will in addition to a GRAS 14AA Electrostatic Actuator Amplifier need an Electrostatic Actuator and a holder. These are included in the GRAS OP0026 kit.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310160392525,"sku":"OP0026","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/OP0026.png?v=1701173287"},{"product_id":"gras-ra00141-2-electrostatic-actuator","title":"GRAS RA0014 1\/2'' Electrostatic Actuator","description":"The RA0014 is used for electrostatic actuator calibration.With the AC test signal superimposed on the 800V DC polarization voltage, the \u003ca href=\"https:\/\/www.gras.dk\/products\/product\/226-12AA.html\"\u003eGRAS 12AA\u003c\/a\u003e makes it possible to measure the pressure frequency response of the microphone under test.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310161572173,"sku":"RA0014","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/RA0014.png?v=1701173293"},{"product_id":"gras-ra0014-s11-2-electrostatic-actuator-for-40au-1","title":"GRAS RA0014-S1 1\/2'' Electrostatic Actuator for 40AU-1","description":"The RA0014-S1 is used for electrostatic actuator calibration of the microphone 40AU-1.With the AC test signal superimposed on the 800V DC polarization voltage, the \u003ca href=\"https:\/\/www.gras.dk\/products\/product\/226-12AA.html\"\u003e12AA\u003c\/a\u003e makes it possible to measure the pressure frequency response of the microphone under test.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310161932621,"sku":"RA0014-S1","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/RA0014_e14e5f01-9c56-4301-b275-bc989b0389c9.png?v=1701173301"},{"product_id":"gras-ra00151-electrostatic-actuator","title":"GRAS RA0015 1'' Electrostatic Actuator","description":"The RA0015 is used for electrostatic actuator calibration.With the AC test signal superimposed on the 800V DC polarization voltage, the 12AA makes it possible to measure the pressure frequency response of the microphone under test.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310162260301,"sku":"RA0015","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/RA0015.png?v=1701173312"},{"product_id":"gras-ra4800adapter-for-sensitivity-verification-of-flush-surface-microphones","title":"GRAS RA4800 Adapter for Sensitivity Verification of Flush\/Surface Microphones","description":"RA4800 is a field verification adapter for UTP, surface-mount, and flush-mount microphones.With this adapter, it is possible to perform quick and reliable verification without having to demount the microphone.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310162391373,"sku":"RA4800","price":0.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/RA4800.png?v=1701173359"},{"product_id":"demo-gras-42ag-multifunction-sound-calibrator-class-1","title":"DEMO GRAS 42AG Multifunction Sound Calibrator, Class 1","description":"The GRAS 42AG Multifunction Sound Calibrator is a portable, battery operated sound source for calibration and check of microphones and sound level meters. It is designed for field use and comes with a protective casing. It conforms to the requirements in IEC 60942 for a class 1 sound calibrator.","brand":"GRAS","offers":[{"title":"Default Title","offer_id":48310521037133,"sku":"42AG-DEMO","price":8992.5,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/files\/42AG_b_1kHz-114dB_HiRes-RGB_fae658bb-4ba9-40ff-96c5-a57a0867be2d.png?v=1701180322"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9344\/9805\/collections\/42AA_HiRes-RGB.png?v=1792066448","url":"https:\/\/gomeasure.dk\/en-se\/collections\/calibration-equipment.oembed","provider":"GOmeasure.dk","version":"1.0","type":"link"}