Megger TDR2000/2 Benutzerhandbuch Seite 6

SHIFT/Cursor right – Dual cursor mode: Press with the SHIFT key to
select alternative cursor in dual cursor mode. Press the SHIFT and
Cursor key again to swap active cursors.
4 Velocity factor: A bi-directional key for setting of the cable
velocity factor in the range 0.300 to 0.999 of the speed of
light. Auto repeats if held down. Refer to the section on
'Velocity factor' for further information.
5 L1-L2 Mode: Selects the test mode by cycling between L1,
L2, L1 & L2, and XTALK. The selected mode is shown in the
top left of the display screen.
SHIFT/Mode – Difference measurement: (L1-L2 or L1-M1, 2...15) To
display the difference between two channels the TDR must be in either
L1&L2 or L1&M#) modes. Press the MODE key with the SHIFT key
depressed. The instrument will display L1-L2, or L1-M1.
6 Zoom: The ZOOM key toggles the display between the whole
display range and a zoomed in view. This allows more
accurate positioning of the cursor bar and hence the
distance measured.
The modes are shown as 'normal'
at the top of the
display window.
SHIFT/Zoom – Intermittent mode: By pressing the ZOOM key with
the SHIFT button held down, the instrument switches to 'Intermittent
mode'. While in this mode the TDR will accumulate any transient
reflections as a permanently displayed trace. To exit the Intermittent
mode press the ZOOM key with the SHIFT button down, or by change
the range, gain or mode settings.
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7
8
9
Refer to the Operation section for further details.
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and 'zoom'
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Help Key: These screens provide help on the use of the
TDR2000/2. Press the help key followed by the function key
on which you require help.
Backlight key: Toggles backlight on or off. Backlight
automatically switches off after 1, 2 or 5 minutes (as set in the
configuration menu.
Gain: A bi-directional key allowing adjustment of the
instrument gain from 0 dB to 90 dB in steps of 6 dB. Auto
repeats if held down.
Shift: Used in combination with other keys to access
alternative modes.
Range: A bi-directional key which adjusts the instruments
measurement range from 16 km (48 kft) down to 50 m
(150 ft). Auto repeats if held down. A full range of details can
be found in the product specification.
On/Off: Switches instrument on and off. The instrument
automatically switches off after a default time of 5, 10 or 15
minutes, as set in the configuration menu, or if the battery
voltage is too low to continue testing.
Menu: Pressing the Menu key displays the instrument menu.
For full details, refer to the menu guide opposite.
Download/Upload: Initiates the download or upload of
stored results between the TDR and the PC. Refer to the
section on downloading later in this user guide.