Elektor 19883, Пошаговая инструкция

Страница: 19 / 34

7 • Final adjustments
● 19
Important: Do not use nuts to secure the BNC sockets to the side
panel of the enclosure.
Finish the assembly by installing the four rubber feet.
7 • Final adjustments
Connect the Kelvin cables to the BNC connectors. Repeat the Trim
procedures (§5.10 and §5.11) to compensate for the new, interfering
components.
The device is now ready for use!
Note: Before a test, at any given frequency, it is possible and
even desirable, to perform both TRIM corrections by pressing the
corresponding button (the second from the top). The new param-
eters (as well as those already modified at other frequencies) can
be saved by a long press on the same button. Saving is indicated
on the display, e.g. by the message Save the Trim Data..., before
returning to the measurement screen!
8 • Stand-alone mode
Equipped with the Display board, the device can work without a com-
puter. This is the stand-alone mode. The instrument automatically
starts in this mode when an external 5 V USB power supply is used. If
the LCR meter is powered from a PC, it can operate in PC mode, but if
you want to use it in stand-alone mode, simply press the top button
on the front panel while powering up the unit (this new mode is
then stored and no further action is required at the next start up). The
same action is required to return to PC mode.
When the measurement screen is displayed, the rotary knob (encoder)
changes the measurement frequency to one of 54 preset values (see
table in §5).
A long press on the rotary knob allows you to enter the menu for se-
lecting a user frequency (from the current frequency). The number to
be changed is selected with the two upper buttons while the rotary