Calibration Kits



Vector Network Analyzers are commonly used to accurately determine the RF Characteristics of microwave components. Accurate Testing of microwave circuits means eliminating measurement errors and ensuring repeatable results. This is only possible when the network analyzers can be calibrated with known and true calibration standards. These standards are not to be subjected to any kind of limitations, they must rather be designed to perfection. As Network Analyzers do have the ability to reduce error terms to negligible values, they depend on the quality and integrity of the Calibration Standards.



Two different techniques are commonly known for coaxial calibration, the Open-Short-Load-Through Calibration Method , and the Line Reflective Line (LRL) Calibration Method, also recognized as Through Reflective Line (TRL).



This method uses as known Standards, Opens, Shorts and Loads. The Load can be either a sliding or a fixed broadband load. The Kits supplied, can be divided into three groups: The Standard Calibration Kit, the Expanded Calibration Kit, and the Professional Calibration Kit. The Instrument Cases for all three of these Calibration Kits are identical. The customer may start with the Standard Calibration Kit and fill the empty spots at a later stage, to end up with an Expanded, or even the Professional Calibration Kit.The Kits, as suggested for Hewlett Packard and Wiltron, do differ slightly in the number of components supplied, as necessary for the different calibration sequences. learn more »



It contains all the components needed for calibration in the subject connector series, Opens, Shorts, Broadband Loads, and the Software Configuration Medium. learn more »



Besides the components supplied with the Standard Calibration Kit, a set of interface gauges for center conductor location dimensions, calibration blocks for zeroing the gauges, wrenches, and a torque wrench are added. learn more »



Additional to the components supplied with the Expanded Calibration Kit, the sets of interface gauges and calibration blocks are completed for measuring further also certain critical outer conductor dimensions. A set of thread limit gauges for checking the connector and coupling nut threads is supplied as well. Four empty spaces can be filled with optional adapters, individually to be specified. learn more »



The Line Reflective Line (LRL), or Through Reflective Line Methods are using Shorts and two different adapter lengths. Spectrum Elektrotechnik GmbH has developed a complete line of Components, as needed for proper and consistent LRL / TRL calibration. The LRL / TRL Components are true 50 Ohm lines. The adapters are not using any supporting material between center contact and outer conductor. Outer conductors and the sets of center contacts are supplied separately. The set of center contacts contains all lengths as needed for adjusting the adjacent in-specification connector interfaces that is usually recessed, as allowed, to perfect 50 Ohms lines. So length adjustments of 0.0004 inches (0.01mm) can be achieved, when all center contacts have been purchased. A Center Contact Insertion Tool helps to align and connect the center contact.
The Calibration Kits are delivered with a disc supplying data on the properties of the Kits' components. Kits are available for the Network Analyzers of Hewlett Packard and Wiltron and can be divided into two groups: The Standard LRL Calibration Kit, and the Professional LRL Calibration Kit. The Instrument Cases for both of these Calibration Kits are identical. The customer may start with the Standard Calibration Kit and fill the empty spots at a later stage, to end up with the Professional Calibration Kit. learn more »



A Calibration Kit contains as a minimum two Shorts (male and female), two Throughlines each (female/female, male/female, male/male) in different lengths and a Disk for the Calibration Characteristics. The Disc is supplied either for the Scalar Network Analyzers of Hewlett Packard, or Wiltron, and is ready to be used. learn more »



Besides the components, as supplied with the Standard Kit, it also contains Interface Gauges for measuring the center condutor location, Calibration Blocks for those Interface Gauges, and a Torque Wrench. learn more »



To verify that the network analyzer system is working properly, the measuring of known devices, other than the calibration standards, is a straightforward method. Spectrum Elektrotechnik GmbH is offering Verification Kits that consist of precision airlines and mismatch airlines. Traceable measurement data are shipped with each kit. learn more »



Vector network analizers require electrically stable cable assemblies for measurement in very critical areas, such as Phase, Amplitude and VSWR. Cables have to maintain calibration data, even when subjected to bending and twisting which can introduce distorting parameters. The cable assembly needs to be flexible without being flaccid. The Cables of Types 18, 22 and 370T are ideal for this application. One end of the Assembly will usually be terminated with an NMD 2.4 mm, 2.92 mm, 3.5mm, 7 mm or N connector, as needed for connecting directly with the RF output of the network analyzer. These NMD Connectors are designed with a larger than standard coupling nut for greater stability. The other end of the ANA - Assembly can be terminated with the proper Test Connector, as needed in the setup. learn more »



Spectrum Elektrotechnik GmbH manufactures a large variety of adapters. Where existing test cables are to be used, between series instrument-grade adapters to those 2.4 mm, 2.92 mm, 3.5 mm, 7 mm, or N-type test port or ANA cable connectors are offered. NMD Instrument-Grade Adapters are supplied when the network analizer test port needs to be changed to another connector series. The NMD Adapters are designed with this larger than standard coupling nut for greater stability. learn more »



Checking the interfaces of connectors and adapters upon incoming inspection is not only highly recommended, it is definitely a necessity. Interfaces not meeting specification will not only lead to degraded specification of the components, furthermore these out of specification interfaces may damage the connectors of mating components or ruin the connectors of test equipment. Connector Gauges consist of an especially adapted dial indicator with appropriate bushings and pins that are designed to mate with the specific connector under test. The indicator of each gauge is zero set by a specific master gauge.When engaged to a connector, it measures the specific interface dimension from a reference plane. For every dimension of interest, a special gauge will be offered. This gives the most accurate results, allows easy calibration, fast testing and helps to avoid mistakes. Gauges are available as “Hand Held” or “Thread On”. Faster testing is possible by using the “Hand Held” gauges, the more accurate readings will be achieved from the “Thread On” gauges, as threading on the gauges will perfectly align with the connector. Hand Held means aligning gauge and connector freely, which may allow for mistakes. learn more »



Connectors have to be mated and need to be tightened. People who are using nothing but their fingers for tightening, usually undertorque. The electrical performance will vary from tightening to tightening, depending how tired the fingers are. In addition: If the same component gets tested several times and by different people, using for tightening nothing but their fingers, the electrical performance will even vary more, as different torque will be applied, equivalent to the strength of the individual. But the strength does not only depend on the physical ability of the individual, furthermore also to the strength set by the mind. Tightening connectors by hand will result from very loose fits to almost correct fits, but usually always incorrect fits. Tightening connectors by hand is obviously inadequate and not recommendable. People who are using a regular wrench, usually overtorque. Short wrenches may lead to torsional forces that are only a little high, the use of longer wrenches however usually results into applying very high torque. Overtorquing of up to three times has been seen. This will deform the interface of the connectors, proper test results from then on cannot be obtained anymore. For proper test results and long life of the connectors the rules need to be obeyed. For each individual connector series a torque has been specified, a torque that ensures proper mating conditions, repeatable electrical performance and guarantees mechanically a long life of the connectors. Using the Torque Wrench guarantees that the connection is not too loose, it also ensures that the connection is not too tight, preventing possible connector damage and impaired electrical performance. Using the Torque Wrench also assures that all connections are equally tight, each time. No connection at a network analyzer, during calibration and testing of components, should be made without using the proper torque wrench. learn more »



Out of limits thread on connectors and adapters can create serious problems and may damage the connectors of mating components or ruin the connectors at the test equipment. Spectrum Elektrotechnik GmbH offers therefore a comprehensive line of thread limit gauges to check the thread on a “GO” / “NO GO” basis. The pitch diameter, pitch angle and number of threads per unit are being examined. A complete Set of gauges consists of two Ring Gauges and one Bolt Gauge. learn more »

Contact Details
Spectrum Elektrotechnik GmbH
Olschewskibogen 1
80935 Munich

Mailing address:
P.O. Box 450 533
80905 Munich

+49 (0)89 / 354 804-0
+49 (0)89 / 354 804-90