R&SHMO1002 Series R&SHMO1202 Series Digital Oscilloscope User Manual 5800530103 Test & Measurement User Manual Version 03General Information Regarding the CE Marking General Information Regarding the CE Marking ROHDE & SCHWARZ measuring instruments comply with regulations of the EMC Directive. ROHDE & SCHWARZ is basing the conformity assessment on prevailing generic and product standards. In cases with potentially different thresholds, ROHDE & SCHWARZ instruments apply more rigorous test conditions. Thresholds for business and commercial sectors as well as small business are applicable for interference emission (class 1B). As to the interference immunity, the standard thresholds for the industrial sector apply. Measurement and data lines connected to the measuring instrument significantly affect compliance with specified thresholds. Depending on the respective application, utilized lines may differ. In regards to interference emission and immunity during measurements, it is critical that the following terms and conditions are observed: 1. Data Cables It is imperative to only use properly shielded cables when connecting measuring instruments and interfaces to external devices (printers, compu- ters, etc.). Unless the manual prescribes an even shorter maximum cable length, data cables (input/output, signal/control) may not exceed a length of 3m and may not be used outside of buildings. If the instrument interface includes multiple ports for interface cables, only one cable at a time may be connected. Generally, interconnections require double-shielded connecting cables. The double-shielded cable HZ72 (available at ROHDE & SCHWARZ) is well suitable as IEEE bus cable. 2. Signal Cables In general, measuring cables for the transmission of signals between measu- ring point and measuring instrument should be kept as short as possible. Unless an even shorter maximum cable length is prescribed, signal cables (input/output, signal/control) may not exceed a length of 1m and may not be used outside of buildings. All signal cables must be shielded (coaxial cable RG58/U). It is important to ensure proper ground connection. Signal genera- tors require the use of double-shielded coaxial cables (RG223/U, RG214/U). 3. Impact on Measuring Instruments If strong high-frequency electric and magnetic fields are present, it may occur despite diligent measurement setup that unwanted signal units are injected into the measuring instrument via connected measuring cables. This will not damage the ROHDE & SCHWARZ measuring instrument or put it out of operation. In some cases, these circumstances may cause the measuring value to slightly exceed specifications. 4. RF immunity of oscilloscopes. 4.1 Electromagnetic RF field The influence of electric and magnetic RF fields may become visible (e.g. RF superimposed), if the field intensity is high. In most cases the coupling into the oscilloscope takes place via the device under test, mains/line supply, test leads, control cables and/or radiation. The device under test as well as the oscilloscope may be effected by such fields. Although the interior of the General Infor- oscilloscope is screened by the cabinet, direct radiation can occur via the CRT gap. As the bandwidth of each amplifier stage is higher than the total 3 dB bandwidth of the oscilloscope, the influence of RF fields of even higher frequencies may be noticeable. mation 4.2 Electrical fast transients / electrostatic discharge Electrical fast transient signals (burst) may be coupled into the oscilloscope Regarding directly via the mains/line supply, or indirectly via test leads and/or control cables. Due to the high trigger and input sensitivity of the oscilloscopes, such normally high signals may effect the trigger unit and/or may become the CE Mar- visible on the TFT, which is unavoidable. These effects can also be caused by direct or indirect electrostatic discharge. king 2