Locking Or Unlocking The Control Panel; About The Phantom Power Supply - Lectronics HM/E01 Instruction Manual

Locking or Unlocking the Control Panel

Control Panel Locked
UP and DOWN arrow buttons to start the Lock timer.
When the timer reaches zero, Loc will be displayed
and the controls will be locked.
When any button is pressed, the word Loc will appear
on the screen as a reminder that the Lock mode is
enabled. None of the buttons will work and the unit
cannot be turned off.
To unlock the controls, remove and re-install the bat-
teries. The unit will power up and return to the stored
settings with the controls unlocked.
NOTE: The only way to unlock a locked
transmitter is to remove the battery.
Rio Rancho, NM
The Lock mode protects the
transmitter from accidental
changes to its settings.
Simultaneously press both the
Digital Hybrid

About the Phantom Power Supply

Three phantom voltages are selectable from the con-
trol 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 voltage range of 12
to 48 Volts. With the proper adapter, this position
can also be used with T power microphones. See
www.lectrosonics.com 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 an
explanation of why 42 and not a "true" 48 Volts.)
For longest battery life use the minimum phantom
voltage necessary for the microphone. Many stage
microphones 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 microphone 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
floating, 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 connected to ground, then you will draw maxi-
mum 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 supplies 4 mA at 42 Volts, 8 mA at 15
Volts, and 8 mA at 5 Volts. The 42 Volts setting actual-
ly supplies the same voltage to a 48 Volt microphone
as the DIN standard arrangement due to a dynamic
biasing scheme that does not have as much voltage
drop as the DIN standard. The 48 Volt DIN standard
arrangement protects against shorts and high fault
current with high resistance in the power supply feeds
to pins 2 and 3. This protects the supply if the sup-
ply current is accidentally shorted to ground and also
keeps the microphone from being attenuated by the
power supply. The HM improves on those functions
and is able to use less power from the battery by us-
ing constant current sources and current limiters. With
this dynamic arrangement 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.
The 5 Volt setting is provided for lavaliere micro-
phones made by us and others. Do not power lava-
lieres from the 15 or 48 Volt setting as the microphone
will most likely be destroyed. Lectrosonics makes an
adapter, MCA5X, that will adapt our standard TA5F 5
pin microphones to the HM. This adapter also pro-
vides protection against excessive phantom voltage. If
voltages higher than 5 Volts are applied to the adapt-
er, a Zener diode will shunt excess voltage to ground.
The microphone won't work until the voltage is cor-
rectly reduced to 5 Volts. If you have an older lavaliere
mic that was wired directly to an XLR for use with the
earlier UH200's, we strongly recommend building our
protection circuit into the XLR to prevent accidental
destruction of the lavaliere.
® Plug-On Transmitter
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