HAMEG HM 312 SERVICE MANUAL MANUAL

Updates for the instrument settings and interface These effects can also be caused by direct or indirect electrostatic discharge.Д¬ursor measurements for the logic channels Due to the high trigger and input sensitivity of the oscilloscopes, such normally high signals may effect the trigger unit and/or may become visible on the TFT, which is unavoidable. As the bandwidth of each amplifier stage is higher than the total вЂ“3dB bandwidth of the oscilloscope, the influence of RF fields of even higher frequencies may be noticeable.Д¤.2 Electrical fast transients / electrostatic dischargeД®lectrical fast transient signals (burst) may be coupled into the oscilloscope directly via the mains/line supply, or indirectly via test leads and/or control cables. The device under test as well as the oscilloscope may be effected by such fields.ДЄlthough the interior of the oscilloscope is screened by the cabinet, direct radiation can occur via the CRT gap.

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. RF superimposed), if the field intensity is high. The influence of electric and magnetic RF fields may become visible (e.g. Small deviations of the measuring value (reading) exceeding the instruments specifications may result from such conditions in individual cases. This will not cause damage or put the instrument out of operation. Under the presence of strong high frequency electric or magnetic fields, even with careful setup of the measuring equipment, influence of such signals is unavoidable. In combination with signal generators double screened cables (RG223/U, RG214/U) must be used. Signal lines must screened (coaxial cable - RG58/U).

HAMEG HM 312 SERVICE MANUAL MANUAL

Without instruction in the manual for a shorter length, signal lines must be less than 3 meters and not be used outside buildings. For IEEE-bus purposes the double screened cable HZ72 from HAMEG is suitable.Д«asically test leads for signal interconnection between test point and instrument should be as short as possible. If an interface has several connectors only one connector must have a connection to a cable.Д«asically interconnections must have a double screening. Without a special instruction in the manual for a reduced cable length, the maximum cable length of a dataline must be less than 3 meters and not be used outside buildings. For measurementoperationthefollowinghintsandconditionsregardingemission and immunity should be observed:ДЇor the connection between instrument interfaces and external devices, (computer, printer etc.) sufficiently screened cables must be used. For different applications the lines and/or cables used may be different.

The measuringand data lines of the instrument have much influence on emission and immunity and therefore on meeting the acceptance limits. Regarding the immunity (susceptibility) the limits for industrial environment have been used.

For emission the limits for residential, commercial and light industry are applied. In caseswheredifferentlimitvaluesareapplicable,HAMEGappliestheseverer standard.

HAMEGinstrumentsfulfilltheregulationsoftheEMCdirective.Theconformity test made by HAMEG is based on the actual genericand product standards. General information regarding the CE marking

Hameg hm 312 service manual