Lectrosonics HM Bedienungsanleitung PDF herunterladen (Seite 11)

Digital Hybrid

Plug-On Transmitter

Rio Rancho, NM

About the Phantom Power Supply

Three phantom voltages are selectable from the control

panel. The voltages are:

• 5Voltsforlavalieremicrophones,

• 15Voltsforsomeprofessionalmicsrequiringhigh

current and for many common stage mics that will

operate over a wide phantom Voltage range of 12 to

48 Volts. With the proper adapter, this position can

also be used with T power microphones. See our

web site for details on ﬁnding or making the proper

adapter.

• 48Voltsformicrophonesthatdoinfactrequirea

supply greater than 18 Volts. (See below for a dis-

cussion of why 42 and not a “true” 48 Volts.)

For longest battery life use the minimum phantom volt-

age necessary for the microphone. Many stage micro-

phones regulate the 48 Volts down to 10 Volts internally

anyway, so you might as well use the 15 Volt setting and

save some battery power. If you are not using a micro-

phone for the input device, or are using a microphone

that does not require phantom power, turn the phantom

power off.

Phantom power should only be used with a fully ﬂoat-

ing, balanced device such as most microphones with

a 3-pin XLR connector. If you use the phantom power

withanunbalanceddeviceorifpins2or3areDCcon-

nected to ground, then you will draw maximum current

from the power supply. The HM is fully protected against

such shorts but the batteries will be drained at twice the

normal rate.

The transmitter can supply 4 mA at 42 Volts, 8 mA at 15

Volts, and 8 mA at 5 Volts. The 42 Volts setting actually

supplies the same voltage to a 48 Volt microphone as

the DIN standard arrangement due to a dynamic bias-

ing scheme that does not have as much voltage drop

as the DIN standard. The 48 Volt DIN standard arrange-

ment protects against shorts and high fault current with

high resistance in the power supply feeds to pins 2 and

3. This provides protection if the supply current is ac-

cidentally shorted to ground and also keeps the micro-

phone from being attenuated by the power supply.

The HM improves on those functions and is able to use

less power from the battery by using constant current

sources and current limiters. With this dynamic ar-

rangement the HM can also supply more than twice the

current of competing 48 Volt plug on units and provide

four times the current for some very high end 15 Volt

microphones.

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