User manual HAMEG HZ65-3

[. . . ] To support this process, a number of typical component signatures are illustrated at the back of these instructions. The HZ65 has been constructed and tested in accordance with the stipulations of IEC1010-1, which govern protective measures for electronic test instruments, and it has left the factory with all safety features in perfect working order. In order to maintain it in this condition and guarantee safe, nonrisk operation, the user should observe all notes and warnings contained in these operating instructions. [. . . ] Make ready and presettings Upon delivery, the unit is set to operate on 230V ± 10% (50-60Hz). Conversion for operation on 115V ± 10% is performed in the inside of the unit by resoldering of wired jumpers. Always pull the power plug before opening the HZ65!After rnaking sure that this has been done, remove the 4 screws on the base of the unit and lift off the cover. Next to the encapsulated input transformer is a row of 5 lands, to wich the isolated wired jumpers shold be attached as shown in the following diagram (series- or parallel connection of the primary coil). Fuse: T 100mA for 115 V The line overcurrent protection device must have a rating which corresponds to the selected line voltage, and must therefore be replaced when changing over. for type information , consult the circuit diagram. Once you have made sure that the line voltage and overcurrent protection device correspond arid the enclosure has been closed, the 2 BNC jacks rnay be connected to the oscilloscope using the corresponding BNC cables: X (voltage) = Horizontal input Y (current) = Vertical input It the oscilloscope has a different jack type, the BNC jacks can be connected using apropriate adaptors. for connecting the component tester to the oscilloscope , BNC-BNC cables such as HZ31 , HZ33 , and HZ34 , also supplied by HAMEG , are suitable. For oscilloscopes equipped with banana jacks, the connection cable HZ32 8NC may be used with 4-mm banana plugs. If you construct your own adaptor, make sure that the frames of the BNC jacks of the HZ65 are also connected with the oscilloscope chassis for grounding purposes. consult the operating instructions for the oscilloscope , and set it to X-Y mode or external X deflection , as well as - if possible- DC input coupling. After the component tester and oscilloscope have been powered up, a horizontal baseline should appear in the oscilloscope screen. If the 2 banana jacks of the HZ65 are shorted, a vertical line appears on the oscilloscope screen. Use the Y time-division control of the oscilloscope to adjust its length to about half of screen height. It is a good idea to make a note of the oscilloscope settings so that quick tests can be performed with the HZ65 in the middle of other tasks. This prevents any damage from occurring if the 2 test cables should accidentally be shorted on the test bench. Test principle The built-in frequency generator provides a sinusoidal voltage at the same frequency as the line voltage, which is then applied to the series circuit consisting of the test object and a built-in switchable resistor. [. . . ] This is especially quick and easy to do, since the second circuit used for purposes of comparison need not (and must not!Using the test cables, simply probe the corresponding pairs of test points and compare the trace patterns obtained. At times, the circuit under test will itself contain the circuit for comparison, e. [. . . ]