H Heuer Instruments UMDT51A, Руководство пользователя

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Product description
LT51 User Manual 1
1. Product description
The LT51 Line Tester is a portable handheld battery powered instrument. It
combines the features of several pieces of test equipment such as a Selective
Level Meter / Spectrum Analyser, Distortion Analyser, Oscillator, Handheld DMM
and TDR in the one small lightweight package.
It is the ideal instrument for testing, preparing and commissioning copper pairs
for many types of telecommunication services such as xDSL, ISDN, voice
frequency POTS and testing the analog interfaces of digital exchanges and PCM
multiplexers. The LT51 is also very well suited to testing the carrier and
information signals used in Power Line Communication (PLC) equipment.
The LT51 can be deployed as a stand-alone instrument in single-ending testing
configurations to qualify cable pairs, or together with a second remote LT51, can
perform more accurate terminated end-to-end testing. In stand-alone
configurations (without PC control) testing can be automated with selected test
sequences stored in the LT51. Alternatively the LT51 can be remotely controlled
by a PC over the isolated USB link.
Common cable faults such as shorts, opens, poor splices, bridged taps,
corrosion and X-Talk are easily located with the LT51.
Great care has been taken to achieve easy operation of this instrument. Most
functions are accessed by a single button press, or one further soft-key
selection. Measurement results can be displayed graphically or numerically (in
DMM mode) and can be saved into non-volatile memory for later recall or up-
load to a PC for further evaluation and printing.
Some of the features provided by the LT51 include:

Selectable Impedance of 600

, 75

and 50

and bridging (~50 k

).

Spectrum Analyser with Zoom function over spans from 4.5 kHz

Selective Level Meter with 25Hz, 1.74 kHz and 3.1 kHz BWs and AFC.

Psophometer for noise weighting or WIDE for no filter over selected span.

Distortion Analyser from 200 Hz to 2.2 MHz (SNR, THD, SINAD, SFDR).

Fully configurable Oscillator, up-to 2.2 MHz, -60 to +16 dBm.

Return Loss up-to 2.2 MHz, 50, 75, 600

.

Tx Mute, Single Tone or Swept measurements.

DMM functions DC/AC Voltage, DC Current, AC Impedance Magnitude

TDR for location and identification of low resistance or OC faults.

Audio monitor (speaker) and Hands-free telephone for communication

Strong compact PC case designed to withstand rough treatment yet
lightweight (< 1 kg)

High contrast, sunlight-readable graphics display with a back-light

Large soft-touch keys with good feedback

Easy operation
– one key press to set measurement then context sensitive
soft-keys for configuration