Kurth KE301 - Page 28

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ThegreenCONTLED ashesbrieywhenthetesthasbeenactivatedor
whentheresistanceatthetestterminalsexceeds100kΩ.Itlightsupfrom
bright to dark, depending on the value of the resistor. This allows an approx-
imate determination of the resistance. In case of EDP cabling, determining
whether the cable is patched is thus easy and interference-free.
The ET720 and ET800 have an additional sound test mode built in. This
replaces what is called a "beeper". The frequency of the tone depends on the
resistance.At0Ω(shortcircuit)approx.3kHzandatapprox.100kΩ500Hz
are audible. This makes it possible to estimate resistance values. But capac-
itors and other components can also be easily tested in this way.
Fast display of line status
Forlivedatalines/cables(90Vmax.).TheETishigh-impedance(~10MΩ).
The cable/line therefore will not be loaded. The status of the connection ca-
ble, for example, is displayed immediately after switching on and plugging the
ET into the connection socket. How the ET is connected depends on the de-
vice variant, e.g. directly with the RJ-11 plug, or with the optionally available
TAE adapter or by simply connecting to the wires using the crocodile clips.
Free line
Supply voltage up to 90 Volt DC (ISDN). The LED POL lights up and its intensi-
ty depends on the voltage level. Red: a/b reversed; green: correctly polarized,
A wire or minus on red terminal. The ET additionally indicates with a bright red
POL LED that the voltage on the test leads exceeds 90 V. This information can
also be used to identify the voltage at the ISDN U interface. Starting at 100 V,
ET720 and ET800 sound an alarm tone to warn of high voltage.
Busy line
Supply voltage between 10 and 20 V DC. LED POL glows darkly. Red: a/b re-
versed; green: correctly polarized. Useful e.g. at a distributor to check wheth-
er the line is busy or not. Alternating call voltage is indicated by the red and
green POL LED lighting up. If the alternating voltage is AC only, the POL LED
lights orange. In general, ET can be used to check any type of voltage source
(max. 90 V) for polarity, to check the type of voltage and its approximate level.
3. Mode DATA – Network Port Test and Port Finder Function (Link Blink
Function) (ET400/ET720/ET800 only)
If the slide switch is set to DATA position, the DATA LED lights up dimly
green as indication. The additional yellow RJ-45 test lead is used for testing.
Plugged into a network port, the green DATA LED lights up brightly in sync
with the normal link pulse signal (NLP) if the network port is patched. The