{"id":6797,"date":"2026-07-17T16:53:25","date_gmt":"2026-07-17T16:53:25","guid":{"rendered":"https:\/\/europascal.de\/product\/fluke-calibration-4181\/"},"modified":"2026-10-12T09:16:21","modified_gmt":"2026-10-12T09:16:21","slug":"fluke-calibration-4181","status":"publish","type":"product","link":"https:\/\/europascal.de\/en\/product\/fluke-calibration-4181\/","title":{"rendered":"Fluke Calibration 4181 Precise Infrared Calibrator"},"content":{"rendered":"<p>The <strong>Fluke Calibration 4181<\/strong> is a professional precision infrared calibrator designed for accurate and traceable calibration of non-contact infrared thermometers, infrared temperature sensors and compatible thermal imaging cameras. With a temperature range from <strong>35 \u00b0C to 500 \u00b0C<\/strong>, a large <strong>152.4 mm (6 inch) target<\/strong> and a nominal target emissivity of <strong>0.95<\/strong>, the Fluke Calibration 4181 provides an excellent solution for infrared temperature calibration in laboratories, industrial environments and quality assurance applications.<\/p>\n<p>Unlike conventional contact temperature calibrators, the Fluke Calibration 4181 provides a controlled thermal radiation source. The infrared thermometer under test observes the heated target without physical contact, allowing its indicated temperature to be compared directly with the radiometrically calibrated reference temperature.<\/p>\n<p>The Fluke Calibration 4181 is supplied with a <strong>radiometric calibration<\/strong> that characterizes the actual radiation emitted by the target. This is an important advantage compared with calibrating an infrared thermometer against the surface temperature of a conventional heat source.<\/p>\n<p>The large target diameter provides sufficient measurement area for many infrared thermometers with different optical resolutions and distance-to-spot ratios. The target is designed for excellent temperature uniformity and stable operation throughout the calibration process.<\/p>\n<p>The Fluke Calibration 4181 is particularly suitable for infrared thermometers operating in the <strong>8 \u00b5m to 14 \u00b5m spectral range<\/strong> under the conditions specified by Fluke.<\/p>\n<p>An integrated emissivity compensation function allows the calibrator to account for emissivity settings between <strong>0.90 and 1.00<\/strong>, simplifying the calibration of many industrial infrared thermometers.<\/p>\n<p>At <strong>europascal<\/strong>, the Fluke Calibration 4181 provides a professional solution for infrared temperature calibration from near-ambient temperatures up to 500 \u00b0C.<\/p>\n<p>For reliable measurement results and metrological traceability, visit the <a href=\"https:\/\/europascal.de\/en\/calibration-services\/\">europascal Calibration Service<\/a>.<\/p>\n<h2>Your Benefits at a Glance<\/h2>\n<ul>\n<li>Precision infrared temperature calibrator<\/li>\n<li>Temperature range from 35 \u00b0C to 500 \u00b0C<\/li>\n<li>Large 152.4 mm infrared target<\/li>\n<li>Nominal target emissivity of 0.95<\/li>\n<li>Radiometrically calibrated radiation source<\/li>\n<li>Suitable for non-contact infrared thermometers<\/li>\n<li>Suitable for compatible thermal imaging cameras<\/li>\n<li>Optimized for many 8\u201314 \u00b5m infrared thermometers<\/li>\n<li>Integrated emissivity compensation<\/li>\n<li>Emissivity setting from 0.90 to 1.00<\/li>\n<li>Excellent temperature stability<\/li>\n<li>Excellent target uniformity<\/li>\n<li>Fast heating and cooling<\/li>\n<li>Large target for different measurement spot sizes<\/li>\n<li>User-friendly operation<\/li>\n<li>RS-232 communication interface<\/li>\n<li>Suitable for laboratory and industrial calibration<\/li>\n<li>Professional calibration support from europascal<\/li>\n<\/ul>\n<h2>Infrared Temperature Calibration up to 500 \u00b0C<\/h2>\n<p>The <strong>Fluke Calibration 4181<\/strong> covers a temperature range from:<\/p>\n<p><strong>35 \u00b0C to 500 \u00b0C<\/strong><\/p>\n<p>This makes the instrument particularly suitable for medium- and higher-temperature infrared thermometer calibration.<\/p>\n<p>Typical applications include infrared thermometers used for industrial maintenance, process monitoring, electrical inspection, mechanical equipment, production processes and quality assurance.<\/p>\n<p>Several calibration points can be generated throughout the temperature range to evaluate the indication error and measurement behavior of the device under test.<\/p>\n<p>The temperature range of the Fluke Calibration 4181 complements the lower-temperature Fluke Calibration 4180, which covers temperatures from \u221215 \u00b0C to 120 \u00b0C.<\/p>\n<h2>Large 152.4 mm Infrared Target<\/h2>\n<p>The Fluke Calibration 4181 features a large circular target with a diameter of:<\/p>\n<p><strong>152.4 mm (6 inches)<\/strong><\/p>\n<p>Target size is particularly important when calibrating infrared thermometers.<\/p>\n<p>An infrared thermometer does not measure temperature at a single geometrical point. Instead, its detector receives radiation from a finite field of view.<\/p>\n<p>The measurement spot therefore increases as the distance between the infrared thermometer and the target increases.<\/p>\n<p>The large target of the Fluke Calibration 4181 provides flexibility when calibrating instruments with different optical characteristics.<\/p>\n<p>For accurate measurements, the field of view of the device under test should remain sufficiently within the usable target area.<\/p>\n<h2>Radiometrically Calibrated Radiation Source<\/h2>\n<p>A major advantage of the <strong>Fluke Calibration 4181<\/strong> is its radiometric calibration.<\/p>\n<p>For an infrared thermometer, the relevant reference quantity is not simply the contact temperature of the target surface.<\/p>\n<p>The device under test responds to the thermal radiation reaching its detector.<\/p>\n<p>This radiation depends on several factors, including:<\/p>\n<ul>\n<li>Target temperature<\/li>\n<li>Target emissivity<\/li>\n<li>Spectral characteristics<\/li>\n<li>Reflected ambient radiation<\/li>\n<li>Measurement geometry<\/li>\n<li>Spectral response of the infrared thermometer<\/li>\n<\/ul>\n<p>For this reason, Fluke characterizes the 4181 as a radiometric calibration source.<\/p>\n<p>The resulting reference temperature represents the radiation characteristics observed under defined calibration conditions.<\/p>\n<p>This significantly simplifies practical infrared thermometer calibration.<\/p>\n<h2>Nominal Target Emissivity of 0.95<\/h2>\n<p>The target of the Fluke Calibration 4181 has a nominal emissivity of:<\/p>\n<p><strong>\u03b5 = 0.95<\/strong><\/p>\n<p>Emissivity describes how effectively a real surface emits thermal radiation compared with an ideal blackbody at the same temperature.<\/p>\n<p>An ideal blackbody has:<\/p>\n<p><strong>\u03b5 = 1<\/strong><\/p>\n<p>The target of the Fluke Calibration 4181 is therefore a high-emissivity surface, but it should not technically be described as a perfect blackbody.<\/p>\n<p>The radiometric calibration of the instrument is important because it characterizes the radiation source rather than relying solely on the nominal emissivity value.<\/p>\n<h2>Integrated Emissivity Compensation<\/h2>\n<p>The Fluke Calibration 4181 includes an integrated emissivity compensation function.<\/p>\n<p>The adjustable range is:<\/p>\n<p><strong>0.90 to 1.00<\/strong><\/p>\n<p>This feature is useful when calibrating infrared thermometers with adjustable emissivity settings.<\/p>\n<p>For example, if the infrared thermometer is configured for an emissivity of 0.95, the corresponding setting can be used on the calibrator.<\/p>\n<p>The Fluke Calibration 4181 then provides the appropriate compensated reference indication according to its internal model.<\/p>\n<p>This simplifies routine infrared calibration and reduces the need for separate manual calculations.<\/p>\n<h2>Spectral Range<\/h2>\n<p>The specified radiometric performance of an infrared calibration source depends on wavelength.<\/p>\n<p>The Fluke Calibration 4181 is particularly intended for infrared thermometers operating in the long-wave infrared range.<\/p>\n<p>A relevant spectral range for the manufacturer&#8217;s stated radiometric specifications is:<\/p>\n<p><strong>8 \u00b5m to 14 \u00b5m<\/strong><\/p>\n<p>This range is commonly used by industrial handheld infrared thermometers and many thermal imaging cameras.<\/p>\n<p>The spectral response of the device under test must nevertheless be considered during calibration.<\/p>\n<p>An infrared thermometer operating at significantly shorter wavelengths cannot automatically be calibrated with the same uncertainty specifications.<\/p>\n<p>For example, the specifications applicable to an 8\u201314 \u00b5m thermometer should not simply be transferred to a pyrometer operating around 1.9 \u00b5m.<\/p>\n<h2>Display Accuracy<\/h2>\n<p>The Fluke Calibration 4181 provides a radiometrically calibrated reference indication.<\/p>\n<p>Typical manufacturer display accuracy specifications include:<\/p>\n<div>\n<div>\n<div>\n<table>\n<thead>\n<tr>\n<th>Temperature Range<\/th>\n<th>Display Accuracy<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>35 \u00b0C to 100 \u00b0C<\/td>\n<td>\u00b10.35 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>100 \u00b0C to 200 \u00b0C<\/td>\n<td>\u00b10.50 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>200 \u00b0C to 350 \u00b0C<\/td>\n<td>\u00b10.70 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>350 \u00b0C to 500 \u00b0C<\/td>\n<td>\u00b11.00 \u00b0C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<p>These values apply under the conditions specified by Fluke.<\/p>\n<p>The display accuracy must not be confused with stability, uniformity or the measurement uncertainty stated on a calibration certificate.<\/p>\n<p>For professional calibration, all relevant uncertainty contributions must be considered.<\/p>\n<h2>Excellent Temperature Stability<\/h2>\n<p>Stable target temperature is essential for reproducible infrared calibration.<\/p>\n<p>The Fluke Calibration 4181 provides excellent short-term temperature stability.<\/p>\n<p>Typical stability specifications are:<\/p>\n<div>\n<div>\n<div>\n<table>\n<thead>\n<tr>\n<th>Temperature<\/th>\n<th>Stability<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>35 \u00b0C<\/td>\n<td>\u00b10.05 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>200 \u00b0C<\/td>\n<td>\u00b10.10 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>500 \u00b0C<\/td>\n<td>\u00b10.10 \u00b0C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<p>Low temperature fluctuations allow infrared thermometers to be compared with the reference temperature under stable measurement conditions.<\/p>\n<p>This is particularly useful when several measurements are performed at the same calibration point.<\/p>\n<h2>Target Uniformity<\/h2>\n<p>Temperature uniformity across the target surface is another important characteristic of an infrared calibrator.<\/p>\n<p>Infrared thermometers with different optical systems may observe different target areas.<\/p>\n<p>If the target temperature varies significantly across the surface, instruments with different measurement spot sizes may produce different results.<\/p>\n<p>The Fluke Calibration 4181 is designed to provide excellent uniformity across its large target.<\/p>\n<p>Fluke specifies uniformity for different target areas, allowing the contribution of source non-uniformity to be considered during calibration.<\/p>\n<p>This characteristic is particularly important for thermal imaging cameras and infrared thermometers with relatively large measurement spots.<\/p>\n<h2>Distance-to-Spot Ratio<\/h2>\n<p>The optical resolution of an infrared thermometer is commonly expressed using the distance-to-spot ratio.<\/p>\n<p>For example:<\/p>\n<p><strong>D:S = 12:1<\/strong><\/p>\n<p>means that at a nominal distance of 120 mm, the corresponding measurement spot diameter is approximately 10 mm under the manufacturer&#8217;s specified optical definition.<\/p>\n<p>However, the actual field of view of an infrared thermometer is not necessarily limited by a perfectly sharp circular boundary.<\/p>\n<p>For calibration purposes, the measurement spot should therefore be significantly smaller than the target.<\/p>\n<p>The large 152.4 mm target of the Fluke Calibration 4181 provides sufficient margin for many infrared thermometer designs.<\/p>\n<h2>Correct Alignment of the Device Under Test<\/h2>\n<p>Measurement geometry is critical during infrared calibration.<\/p>\n<p>The infrared thermometer should normally be positioned:<\/p>\n<ul>\n<li>Perpendicular to the target<\/li>\n<li>Aimed at the center of the target<\/li>\n<li>At a reproducible distance<\/li>\n<li>With the measurement spot completely inside the usable target area<\/li>\n<\/ul>\n<p>Incorrect alignment can cause the detector to receive radiation from areas outside the calibrated target.<\/p>\n<p>This can introduce significant measurement errors.<\/p>\n<p>The calibration distance should therefore be documented where required.<\/p>\n<h2>Calibration of Infrared Thermometers<\/h2>\n<p>A typical calibration procedure with the Fluke Calibration 4181 can be performed as follows.<\/p>\n<h3>1. Set the Calibration Temperature<\/h3>\n<p>Select the required temperature on the Fluke Calibration 4181.<\/p>\n<h3>2. Allow the Source to Stabilize<\/h3>\n<p>Wait until the target has reached sufficiently stable conditions.<\/p>\n<h3>3. Configure Emissivity<\/h3>\n<p>Configure the emissivity settings according to the calibration procedure and the device under test.<\/p>\n<h3>4. Position the Infrared Thermometer<\/h3>\n<p>Aim the infrared thermometer at the center of the target.<\/p>\n<p>The optical measurement spot must remain within the calibrated target area.<\/p>\n<h3>5. Record the Reference Temperature<\/h3>\n<p>Record the radiometric reference temperature indicated by the Fluke Calibration 4181.<\/p>\n<h3>6. Record the Device Under Test<\/h3>\n<p>Record the temperature indicated by the infrared thermometer.<\/p>\n<h3>7. Determine the Indication Error<\/h3>\n<p>The indication error can be calculated as:<\/p>\n<p><strong>\u0394T = T_DUT \u2212 T_REF<\/strong><\/p>\n<p>where:<\/p>\n<ul>\n<li>\u0394T = indication error<\/li>\n<li>T_DUT = temperature indicated by the device under test<\/li>\n<li>T_REF = reference temperature<\/li>\n<\/ul>\n<h3>8. Repeat at Additional Calibration Points<\/h3>\n<p>Repeat the procedure at all required temperatures.<\/p>\n<h2>Calibration of Thermal Imaging Cameras<\/h2>\n<p>The Fluke Calibration 4181 can also be used for testing compatible radiometric thermal imaging cameras.<\/p>\n<p>Its large target provides a useful radiation field for evaluating temperature indication at selected calibration points.<\/p>\n<p>The thermal imaging camera should be positioned so that the measurement region is completely within the suitable area of the calibration target.<\/p>\n<p>Depending on the required calibration procedure, measurements can be performed using the center pixel, a defined region of interest or another specified evaluation area.<\/p>\n<p>The camera&#8217;s spectral response, focus, measurement distance, emissivity settings and reflected temperature settings must be considered.<\/p>\n<p>The suitability of the Fluke Calibration 4181 for a particular thermal imaging camera therefore depends on the required measurement uncertainty and calibration method.<\/p>\n<h2>Fast Heating and Cooling<\/h2>\n<p>Efficient temperature changes reduce calibration time.<\/p>\n<p>The Fluke Calibration 4181 provides fast heating and cooling for an infrared source covering temperatures up to 500 \u00b0C.<\/p>\n<p>Typical heating time from:<\/p>\n<p><strong>35 \u00b0C to 500 \u00b0C: approximately 20 minutes<\/strong><\/p>\n<p>Typical cooling time from:<\/p>\n<p><strong>500 \u00b0C to 100 \u00b0C: approximately 100 minutes<\/strong><\/p>\n<p>The actual time before a calibration measurement can be performed also depends on the required stabilization criteria.<\/p>\n<p>Reaching the setpoint does not automatically mean that the source has reached the stability conditions required for calibration.<\/p>\n<h2>RS-232 Communication<\/h2>\n<p>The Fluke Calibration 4181 includes an RS-232 communication interface.<\/p>\n<p>This allows the instrument to communicate with a computer or compatible automated measurement system.<\/p>\n<p>Remote communication can be useful for:<\/p>\n<ul>\n<li>Automated calibration procedures<\/li>\n<li>Setpoint control<\/li>\n<li>Measurement documentation<\/li>\n<li>Laboratory integration<\/li>\n<li>Data acquisition<\/li>\n<\/ul>\n<p>This makes the instrument suitable for both manual and computer-controlled calibration applications.<\/p>\n<h2>Technical Highlights<\/h2>\n<div>\n<div>\n<div>\n<table>\n<thead>\n<tr>\n<th>Feature<\/th>\n<th>Fluke Calibration 4181<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Product type<\/td>\n<td>Precision Infrared Calibrator<\/td>\n<\/tr>\n<tr>\n<td>Manufacturer<\/td>\n<td>Fluke Calibration<\/td>\n<\/tr>\n<tr>\n<td>Temperature range<\/td>\n<td>35 \u00b0C to 500 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Target diameter<\/td>\n<td>152.4 mm<\/td>\n<\/tr>\n<tr>\n<td>Nominal target emissivity<\/td>\n<td>0.95<\/td>\n<\/tr>\n<tr>\n<td>Emissivity compensation<\/td>\n<td>0.90 to 1.00<\/td>\n<\/tr>\n<tr>\n<td>Relevant spectral range for stated accuracy<\/td>\n<td>8\u201314 \u00b5m<\/td>\n<\/tr>\n<tr>\n<td>Display accuracy, 35\u2013100 \u00b0C<\/td>\n<td>\u00b10.35 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Display accuracy, 100\u2013200 \u00b0C<\/td>\n<td>\u00b10.50 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Display accuracy, 200\u2013350 \u00b0C<\/td>\n<td>\u00b10.70 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Display accuracy, 350\u2013500 \u00b0C<\/td>\n<td>\u00b11.00 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Stability at 35 \u00b0C<\/td>\n<td>\u00b10.05 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Stability at 200 \u00b0C<\/td>\n<td>\u00b10.10 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Stability at 500 \u00b0C<\/td>\n<td>\u00b10.10 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Heating time, 35 \u00b0C to 500 \u00b0C<\/td>\n<td>Approx. 20 min<\/td>\n<\/tr>\n<tr>\n<td>Cooling time, 500 \u00b0C to 100 \u00b0C<\/td>\n<td>Approx. 100 min<\/td>\n<\/tr>\n<tr>\n<td>Communication<\/td>\n<td>RS-232<\/td>\n<\/tr>\n<tr>\n<td>Target type<\/td>\n<td>Flat radiometric infrared source<\/td>\n<\/tr>\n<tr>\n<td>Dimensions<\/td>\n<td>Approx. 356 \u00d7 241 \u00d7 216 mm<\/td>\n<\/tr>\n<tr>\n<td>Weight<\/td>\n<td>Approx. 9.5 kg<\/td>\n<\/tr>\n<tr>\n<td>Calibration<\/td>\n<td>Radiometric calibration<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<h2>Fluke Calibration 4180 vs. Fluke Calibration 4181<\/h2>\n<p>The Fluke Calibration 4180 and Fluke Calibration 4181 are designed for different temperature ranges.<\/p>\n<div>\n<div>\n<div>\n<table>\n<thead>\n<tr>\n<th>Feature<\/th>\n<th>Fluke Calibration 4180<\/th>\n<th>Fluke Calibration 4181<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Temperature range<\/td>\n<td>\u221215 \u00b0C to 120 \u00b0C<\/td>\n<td>35 \u00b0C to 500 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Target diameter<\/td>\n<td>152.4 mm<\/td>\n<td>152.4 mm<\/td>\n<\/tr>\n<tr>\n<td>Nominal emissivity<\/td>\n<td>0.95<\/td>\n<td>0.95<\/td>\n<\/tr>\n<tr>\n<td>Emissivity compensation<\/td>\n<td>0.90\u20131.00<\/td>\n<td>0.90\u20131.00<\/td>\n<\/tr>\n<tr>\n<td>Radiometric calibration<\/td>\n<td>Yes<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>RS-232<\/td>\n<td>Yes<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Primary application<\/td>\n<td>Low-temperature IR calibration<\/td>\n<td>Medium\/high-temperature IR calibration<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<p>For infrared calibration close to and below ambient temperature, the <strong>Fluke Calibration 4180<\/strong> is generally the appropriate model.<\/p>\n<p>For temperatures from 35 \u00b0C up to 500 \u00b0C, the <strong>Fluke Calibration 4181<\/strong> provides the required extended range.<\/p>\n<p>Together, both instruments provide broad coverage for professional infrared temperature calibration.<\/p>\n<h2>Infrared Source vs. Blackbody Cavity<\/h2>\n<p>The Fluke Calibration 4181 uses a <strong>flat radiating target<\/strong>.<\/p>\n<p>It should therefore not be confused with a deep-cavity blackbody source.<\/p>\n<p>A cavity blackbody can achieve an effective emissivity very close to 1 because of multiple internal reflections.<\/p>\n<p>The Fluke Calibration 4181 instead uses a large flat target with a nominal emissivity of 0.95.<\/p>\n<p>Its radiometric calibration is therefore particularly important.<\/p>\n<p>This design provides the advantage of a large target suitable for many handheld infrared thermometers and thermal imaging cameras.<\/p>\n<h2>Typical Applications<\/h2>\n<p>The <strong>Fluke Calibration 4181<\/strong> is suitable for:<\/p>\n<ul>\n<li>Infrared thermometer calibration<\/li>\n<li>Infrared pyrometer verification<\/li>\n<li>Non-contact temperature calibration<\/li>\n<li>Infrared temperature sensor testing<\/li>\n<li>Compatible thermal imaging camera testing<\/li>\n<li>Radiometric temperature calibration<\/li>\n<li>Industrial temperature measurement<\/li>\n<li>Electrical maintenance<\/li>\n<li>Mechanical maintenance<\/li>\n<li>Preventive maintenance<\/li>\n<li>Process monitoring<\/li>\n<li>Production testing<\/li>\n<li>Quality assurance<\/li>\n<li>Laboratory temperature calibration<\/li>\n<li>Infrared temperature metrology<\/li>\n<li>Research and development<\/li>\n<li>Field calibration<\/li>\n<\/ul>\n<h2>Calibration by europascal<\/h2>\n<p>Accurate infrared temperature measurements require a suitable radiometric reference source and a controlled calibration procedure.<\/p>\n<p>europascal provides professional calibration services for infrared temperature measuring instruments and other temperature measurement equipment.<\/p>\n<p>Relevant calibration parameters can include the reference temperature, source stability, source uniformity, spectral characteristics, emissivity and measurement geometry.<\/p>\n<p>For professional calibration and metrological traceability, visit the <a href=\"https:\/\/europascal.de\/en\/calibration-services\/\">europascal Calibration Service<\/a>.<\/p>\n<p>europascal also supports customers in selecting suitable calibration equipment for infrared thermometers, pyrometers and thermal imaging cameras.<\/p>\n<h2>Why Choose the Fluke Calibration 4181?<\/h2>\n<p>The <strong>Fluke Calibration 4181<\/strong> combines a wide temperature range, large target surface and radiometric calibration in one professional infrared calibration source.<\/p>\n<p>Its temperature range from 35 \u00b0C to 500 \u00b0C covers many industrial infrared temperature measurement applications.<\/p>\n<p>The 152.4 mm target provides sufficient measurement area for a wide variety of infrared thermometers.<\/p>\n<p>A nominal target emissivity of 0.95 and integrated emissivity compensation support practical calibration procedures.<\/p>\n<p>Excellent temperature stability and target uniformity contribute to reproducible measurement results.<\/p>\n<p>The radiometric calibration is particularly important because infrared thermometers measure emitted radiation rather than simply the contact temperature of a surface.<\/p>\n<p>RS-232 communication enables integration into suitable automated calibration systems.<\/p>\n<p>For calibration laboratories and industrial users requiring a reliable infrared reference source up to 500 \u00b0C, the Fluke Calibration 4181 provides an excellent combination of performance, flexibility and ease of use.<\/p>\n<p>europascal supports customers with infrared calibration equipment, temperature measurement technology and professional calibration services.<\/p>\n<p><a href=\"https:\/\/europascal.de\/marke\/fluke-calibration\/\">Further products from Fluke Calibration can be found here.<\/a><\/p>\n<p><a href=\"https:\/\/www.fluke.com\/en-us\/product\/calibration-tools\/temperature-calibrators\/fluke-calibration-4180-4181?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\">Manufacturer information about the Fluke Calibration 4181 can be found on the official Fluke website.<\/a><\/p>\n<p><a class=\"download-datasheet\" href=\"#\" data-pdf=\"https:\/\/europascal.de\/wp-content\/uploads\/2026\/05\/4180_4181-Infrared-Calibrator.pdf\"><span style=\"color: #0000ff;\"><strong><em>Download Datasheet<\/em><\/strong><\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The <strong>Fluke Calibration 4181<\/strong> is a precision infrared calibrator for professional calibration of non-contact infrared thermometers and compatible thermal imaging cameras. Featuring a temperature range from <strong>35 \u00b0C to 500 \u00b0C<\/strong>, a large <strong>152.4 mm target<\/strong> and a nominal emissivity of <strong>0.95<\/strong>, it provides a stable and radiometrically characterized reference source. Integrated emissivity compensation, excellent temperature stability and RS-232 communication make the Fluke Calibration 4181 ideal for laboratory, industrial and quality assurance 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