H Heuer Instruments UMDT51A, Руководство пользователя

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Making Measurements
LT51 User Manual 39
6. Making measurements
Measurements on the LT51 are selected by pressing the following keys:
Selects graphical / spectrum display mode (default: Level /
Noise). Softkeys allow selection of various graphical
measurements such as such as Level / Noise, Return Loss and
Next / Loss.
Initiates sequence to connect to remote LT51 tester (on RTXa-b
terminals). Softkeys access the Self-test and measurements that
support end-end automatic testing with a remote LT51 such as
Return Loss, OS Balance, FEXT& LCL Balance etc.
Selects numeric / DMM display mode (default: previous setting).
Softkeys allow selection of various measurements such as
Level/Noise, DCV/ACV, Return Loss, Impedance, Next / Loss.
Causes the LT51 to go “off-hook” on the RTXa-b test leads and
function as a telephone dial set. Hangs up (returns to “on-hook”)
when this key is pressed again.
Perform a TDR measurement on the pair connected to the
RTXa-b terminals.
Most measurements made by the LT51 can be displayed either in graphical or
numerical format by pressing the key or key once the
measurement has been selected.
The AC/DC Voltage and AC Impedance measurements can only be displayed in
numerical format and can only be accessed by pressing the key.
The TDR function is always in graphical format.
Swept measurements make more sense in the graphical format, however can
also be displayed in numerical format.