Megger TDR2000/2 Guia Del Usuario página 6

2. Cursor left: Moves cursor left, on the display. Auto repeats if held
down.
SHIFT/Cursor left – 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.
3. The Find key searches for the furthest major change of impedance.
This may be a fault or the end of the cable if this is a short or open
circuit hazardous voltage is present.
4. Cursor Right: Move cursor right, on the display. Auto repeats if held
down.
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.
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. 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.
7. 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.
6
8 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.
Refer to the Operation section for further details.
9. 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.
10. 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' and 'zoom' 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.
11. Menu: Pressing the Menu key displays the instrument menu. For full
details, refer to the menu guide opposite.
12. 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.
13. Shift: Used in combination with other keys to access alternative
modes.
14. Backlight key: Toggles backlight on or off. Backlight automatically