Trace Storage; Saving A Trace To Memory - Megger TDR2000/2 Guia Del Usuario

width, refer to the menu section of this user guide.
Pulse Height
Three pulse height options are available: 3 V , 5 V and 14 V pk-pk, although
14 V pulses are not available when the instrument test range is less than
400 m. By increasing the pulse height the displayed reflections are larger
hence easier to identify. However, large pulse heights may 'skip' faults,
especially those close to the instrument.
Trace Storage (M1 to M15)
The TDR2000/2 has 15 memory locations, which can be used to save
traces. These may be stored for future analysis or downloaded to the
TRACEMASTER software for analysis on a PC. Each memory location stores
the graphical trace along with the test parameters, gain, range and mode
settings.
Saving a trace
With the desired trace visible on the display, hold down the SHIFT key
together with the SAVE key.
The display should display a memory location in the top left corner of the
screen and 'SAVE MODE'. Press SHIFT and SAVE.
With the extensive dual trace and difference modes available to the
TDR2000/2, memory locations can be used as comparisons for live traces.
This is useful if the known good cores that would normally be used in the
L1-L2 mode are two far away from the C.U.T. Instead, a memory trace of a
known good cable can be compared against the C.U.T.
Recalling a trace
From any of the display modes L1, L2, L1&L2, etc, press the SAVE key. The
instrument will display the trace in memory location M1 or other
previously selected location. The range and gain settings are also recalled.
To scroll through all memory locations, press the UP or DOWN arrow on
the GAIN key (8).
A recalled trace can be compared with L1 by pressing the MODE key. Press
SHIFT and MODE together to switch between displaying L1&M and L1-M.
The range, gain and pulse width are recalled and automatically set to the
stored values, and it will not be possible to change these when showing a
stored trace. However, the cursor can be re-positioned, ZOOM mode
selected and the velocity factor changed so that full analysis of the stored
trace may be made.
To exit trace recall mode press the SAVE key.
Downloading to a PC
To download the stored trace to a PC, connect the TDR2000/2 to the PC
using the null modem download lead, supplied with the instrument.
To set the instrument to data transfer mode, hold down the SHIFT key
(13) and press the PC key (6). The TDR2000/2 is ready to send or receive
data.
Run TRACEMASTER on the computer and set to receive data (refer to your
Tracemaster help file for full details). All stored traces will be copied to the
computer. The stored trace can be annotated and kept on file for future
reference.
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