Microtech Gefell PEM 975 User manual

PEM 975
Recording at a lectern or table - sitting or standing
The PEM 975 is a special version of the KEM 975 - turned 90º to be used horizontally on a lectern or table.
This Data Sheet is the technical specifications of the PEM 975 - for more information please also see the
full Data Sheet on the KEM 975
Cardioid-Plane-Microphone
with non-rotational symmetrical directivity
User Manual

Adress Microtech Gefell GmbH
Georg-Neumann-Platz
07926 Gefell
Germany
Telephone [phone]
Fax [phone]
Internet www.microtechgefell.de
E-Mail [e-mail]
2 M.EN 201180.01
Address
M.EN PEM2020.01

LED indicator
XLR-5M connector
(inside)
PEM 975
M.EN PEM2020.01

Rackmount kit
front panel
connector
housingrack
adapter rack
adapter
4 M.EN 201180.01
rack
adaptor
“ear”
joining
connector
blank panel
rack
adaptor
“ear”
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Contents
1 Technical specifications 07
2 Delivery 08
3 Accessories 09
4 About this manual 10
5 General Safety Instructions 10
5.1 Danger and information signs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.2 Normal Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.3 Unauthorised Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4 Intended Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6 Initial Steps 11
6.1 Setting up the equipment .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1.1 Setting up the PEM 975 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1.2 Setting up the N 975 power supply . . . . . . . . . . . . . . . . . . . . . . . . 11
6.2 Installing the rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.2.1 Installing the N 975 into a half-19” Rack . . . . . . . . . . . . . . . . . . . . . 12
6.2.2 Installing the 19” Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.3 Connecting the equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.4 Aligning the microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.5 Disassembling and storing the microphone.. . . . . . . . . . . . . . . . . . . . . . . . 14
6.5.1 Storage at the venue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.5.2 Storage in the transport case ... . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Individual settings 14
7.1 Setting the supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.2 Setting the level ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.3 Setting grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8 Use of the accessories 15
9 Cleaning and Maintenance 15
9.1 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9.2 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10 Guarantee 16
11 Disposal of old equipment 17
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2111142
satin nickel
2111143
dark bronze

1 Technical specifications
Cardioid-Plane-Microphone KEM 975
Poar pattern horizontal super cardioid
vertical club shaped
Recording angle horizontal 120 Grad
vertical 30 Grad
Acoustic operating principle Pressure gradient
transducer
Frequency range 40 bis 18000 Hz
Sensitivity 775 mV/Pa
at 1 kHz, Gain 0 dB
Rated impedance 40 Ohm
Equivalent loudness level CCIR 468-4 24 dB
DIN EN 60268-4 15 dB(A)
Max. SPL for THD 0,5 Gain 12 dB 104 dB
Gain 0 dB 116 dB
Gain -12 dB 128 dB
Gain -24 dB 140 dB
Gain -36 dB 152 dB
Connecting plugs Neutrik XLR5M
Weight 1,07 kg
Length 343 mm
Diameter Mesh 38 mm
Gain 25 mm
Finish nickel matt,
dunkel bronze
Power supply N 975
Power supply voltage 230/115 V AC
±10%, 50/60 Hz
Connecting plugs KEM 975 XLR5F
Audiosignal XLR3M
Weight 1,6 kg
Width 221 mm
Depth 170 mm
Height 45 mm
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Polar pattern
Output connector
Neutrik XLR-5M
120º
30º
40 - 18,000 Hz
40 Ω
Housing
Connectors
Audio output
XLR-5F
XLR-3M
satin nickel
dark bronze
Connectors
Connectors
Output connector
club shaped
cardioid
PEM 975
PEM 975
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30º
120º

2 Delivery
Cardioid-Plane-Microphone KEM 975
Microphone holder MH 975
Power supply N 975
Connection cable (10 m) C 975.1
Main cable
Rack mounting set
Reducing nut 5/8” on 3/8” or 1/2”
Tommy-screw 8 mm for MH 975
Socket wrench 8 mm for MH 975
Suitcase 450 x 160 x 365 mm
satin nickel Order-No. 211180
dark bronze Order-No. 211181
Prior to each use of the microphone make sure that all the parts are in a perfect condition. We also rec-
ommend to inspect the device for residual dust at appropriate intervals and to have the Microtech Gefell GmbH
examine it, if necessary.
8 M.EN 201180.01
IEC mains cable
Thread adaptor: ⅝” male to ⅜” & ½” female
8mm Allen key for MH 975
Transit case 450 x 160 x 365 mm
Prior to each use of the microphone make sure that all parts are in perfect condition.
We also recommend that the microphone is inspected for residual dust at appropriate intervals and to have
Microtech Gefell GmbH examine it, if necessary.
PEM 975
Transit case 450 x 350 x 160 mm
Order-No. 2111142
Order-No. 2111143
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Order-No. 2111142

3 Accessories
Microphone connection cable 10 m C975.1 Order-No. 202224
Microphone connection cable 20 m C975.2 Order-No. 202225
Microphone connection cable 30 m C975.3 Order-No. 202226
Microphone connection cable with angle plug 10 m C975.1 W Order-No. 202227
Delta-Capsule DM 21
satin nickel Order-No. 201246
dark bronze Order-No. 201247
Cone holder for elastic-stationary fixing KH 975.03
Reducing nut 5/8” on M10
nickel matt Order-No. 202374
dunkel bronze Order-No. 202375
Cone holder for elastic-stationary fixing KH 975.1
Reducing nut 5/8” auf M10
satin nickel Order-No. 202376
dark bronze Order-No. 202377
Microphone hanger MA 975
1x Microphone holder MH 975
2x Reducing nut 5/8” on M6
2x Ring screw M6
Tommy-screw und socket wrench 8 mm
satin nickel Order-No. 202380
dark bronze Order-No. 202381
Prior to each use of the microphone make sure that all the parts are in a perfect condition. We also recommend
to inspect the device for residual dust at appropriate intervals and to have the Microtech Gefell GmbH examine
it, if necessary.
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Microphone connection cable with rt.angled plug 10m
satin nickel
dark bronze
Anti-vibration mount for permanent fixing - 10cm
Thread adaptor ⅝” to M10
Anti-vibration mount for permanent fixing - 3cm
Thread adaptor ⅝” to M10
Auditorium hanger
2 x Thread adaptor ⅝” to M6
2 x Ring screw M6
Tommy-screw and Allen key 8mm
Prior to each use of the microphone make sure that all parts are in perfect condition.
We also recommend that the microphone is inspected for dust at appropriate intervals and to have
Microtech Gefell GmbH examine it, if necessary.
M.EN PEM2020.01
Prior to each use of the microphone make sure that all parts are in perfect condition.
We also recommend that the microphone is inspected for dust at appropriate intervals and to have
Microtech Gefell GmbH examine it, if necessary.

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4 About this manual
Please read this User Manual carefully before use
to minimise the risk of physical injury or damage to
property or to the equipment.
Keep this User Manual handy during installation
and store it in a safe place in case it is needed by a
user at a later date. If you are an installation
company, please make sure this Manual is passed
on to the customer on completion of the installation.
Please pass this User Manual on to any subsequent
owners to ensure safe use of the product.
5 General Safety Instructions
5.1 Danger and information signs
5.2 Normal Use
The PEM 975 is a line array microphone with the
main sound input direction perpendicular to the
front of the microphone. It is not a rotationally
symmetric polar-pattern, but a cardioid pattern at
rt.angles to the microphone and a narrow 30 !angle
in the other direction.
The microphone is designed to capture a person
speaking at a lectern, podium, table, etc. Because
of the cardioid characteristic in the vertical plane, it
does not matter if the person is tall or short, or
standing up or sitting down, it picks up equally well.
It will reject the sound of anyone standing or sitting
next to the speaker as the horizontal pick-up is very
tight.
It is designed for indoor use, or for temporary
outdoor use.
5.3Unauthorised Use
This product should not be used by children or
persons with impaired physical, sensory or mental
abilities; nor by persons who have a lack of
experience, unless they are being supervised.
5.4Intended Use
Do not expose yourself to extreme noise levels
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6 Initial Steps
6.1 Setting up the equipment
6.1.1 Setting up the PEM 975
The PEM 975 is designed for permanent or
temporary mounting.
For temporary mounting, the PEM 975 can be
placed on the table, lectern, etc. We would advise
using a vibration-absorbing mat underneath (EG:
Sorbothane®, or similar) the microphone.
For permanent mounting the PEM 975 can be
screwed to the surface required. For hiding the
cable, a hole can be drilled in the surface before
mounting the microphone.
.
6.1.2 Setting up the N 975 power supply
1. Install the power supply in a well-ventilated
dry place. .
2. Install it so that it is protected from being
knocked or dropped.
6.2 Installing the rack
The dimensions of the N 975 correspond to the 19”
rack mounting standard for mounting in a standard
rack or a built-in cupboard. The N 975 is half-width,
so it can be mounted in a half-width rack, or two can
be mounted side-by-side in a standard rack with the
supplied rack ears. If a single N 975 needs to be
mounted in a standard 19” rack, use the supplied
blanking panel in the place of the second N 975.
Place the microphone and the power supply unit
in such a way that they are protected from being
trodden on or falling down.
Ensure that the cables are not strained through
tension.
Do not use the microphone or power supply after
they have been dropped.
Repairs should only be carried out by the
Microtech Gefell GmbH Service Department.
Place the microphone and power supply unit in a
way that they are protected from being trodden on
or dropped.
Intense and/or permanent heat exposure will
destroy the microphone. Therefore, do not place
it in locations with direct sunlight or near radiators
or spotlights.
In case of an insufficient mounting depth of the
rack, there is the risk that the connectors at the
rear of the N 975 could be damaged or bent. For
this reason pay close attention to the mounting
depth and allow sufficient space for the
connectors and cables.
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6.2.1 Installing the N 975 into a half-19” Rack
1. Remove the screws on the left and right of
the front panel of the N 975 (see diagram
below).
2. Attach the left and right rack “ears” to the
front panel of the N 975, they positively
click into place, and screw them tightly in
place.
3. Slide the pre-assembled power supply unit
into the rack and screw it securely in place
(if necessary, read the instructions supplied
with the rack).
6.2.2 Installing the N 975 into a 19” Rack
1. Remove the screws on the left and right of
the front panel of the N 975.
2. Attach one of the rack “ears” to one side of
the N 975, it will positively click into place,
and screw it tight.
3. Attach the other rack “ear” to the blank
panel, it will positively click into place, and
screw it tight (if mounting two N 975
together, substitute the second N 975 in
place of the blank panel after removing the
left and right screws as described in 1.
above).
4. Place the joining connector on the other
end of the blank panel (or second N 975)
and screw it tight.
5. Place the pre-assembled blank panel (or
second N 975) with the joining connector to
the desired side of the N 975 (the blank
panel can be mounted either side) and
screw it tight.
6. Slide the pre-assembled power supply unit
into the rack and screw it securely in place
(if necessary, read the instructions supplied
with the rack).
If there are devices that get hot installed in the
same rack or cupboard as the N 975, the N 975
is at risk of damage. Therefore sufficient
ventilation must be provided to ensure a free air-
flow to keep the devices cool.
The front panel always includes 4 screws
(matched to the rack or cabinet) and 4 washers.
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6.3 Connecting the equipment
1. Plug the XLR-5F connector of the
microphone cable into the XLR-5M
connector of the microphone until the
connector clicks audibly into place.
2. Plug the XLR-5M connector at the other
end of the microphone cable into the XLR-
5F input connector of the N 975 power
supply until it clicks audibly into place.
4. Plug the XLR-3F connector of the
connection cable into the XLR-3M output
connector of the N 975 power supply until it
clicks audibly into place. Plug the XLR-3M
connector at the other end of the
connection cable into the XLR-3F input
connector of the downstream equipment
(eg: mixer, recorder, amplifier, etc.) until it
clicks audibly into place. .
5. Only after the above connections have
been made, connect the power cable into
the IEC mains connector of the N 975 and
then into the mains power socket (switch on
the power at this socket if it is a switched
socket).
6. Switch on the N 975 power supply with the
on/off power switch.
6.4 Aligning the microphone
Behind the mesh of the PEM 975 is a green
indicator LED.
1. Turn on the LED with the switch on the
PEM 975 microphone. .
2. This gives the speaker an indication that
they are in the correct pick-up area of the
PEM 975 microphone .
3. Turn off the LED (optionally, it can be left
on if people to be recorded wish to be
assured that they are in the pick-up area).
The microphone is now ready for use.
NB: When setting up, it is useful to be aware of the
microphone’s polar-pattern.
Care taken in setting up will give the best results.
The light on the power switch lights up when the
power supply unit is powered up.
The N 975 power supply unit and the PEM 975
can warm up to approx. 35º C, this corresponds
to the normal operating temperature.
The device can be damaged or destroyed if
connected to the incorrect mains voltage.
Therefore, please make sure that the N 975
power supply is set to the correct voltage for the
country of use (see section 7.1: Setting the supply
voltage).
If the amplification is set too high, there is the risk
that the following equipment connected to the
N 975 power supply unit will be destroyed.
Therefore always set the rotary GAIN control to
-36dB, before switching on the N 975.
It is important that the cables are installed safely
and are not twisted nor crushed; also, they should
be protected from being pulled or stretched if
attached to moving parts.
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6.5 Disassembling and storing the microphone
6.5.1 Storage at the venue
1. Turn off the N 975 power supply with the
on/off mains switch.
6.5.2 Storage in the transport case
1. Turn off the N 975 power supply with the
on/off mains switch. .
2. Remove the mains cable from the power
socket and then from the N 975. .
3. Unlatch the XLR-3F connector of the
connection cable and unplug it from the
XLR-3M output connector of the N 975.
4. Unlatch the XLR-3M connector of the
connection cable and unplug it from the
XLR-3F connector of the downstream
device.
5. Press the PUSH button on the XLR-5F
connection of the N 975 power supply and
pull the XLR-5M connector of the
microphone cable out of the socket at the
same time. .
6. Press the release button of the XLR-5F
connector of the microphone cable and pull
it out of the attached XLR-5M connector of
the microphone. .
7. Place the microphone and power supply
unit into the designated recesses of the
transport case. .
8. If the installation was a temporary one, also
store the cables in the cable area of the
transport case – NB: take care in coiling the
cables so they do not get twisted or
damaged while being wound up.
7 Individual settings
7.1 Setting the supply voltage
The N 975 is delivered as standard, set for a mains
supply voltage of 230V. The operating voltage can
be seen by looking at the small window in the fuse
module. The voltage setting will need to be changed
if your country uses a different supply voltage. The
voltage change switch is part of the fuse holder next
to the IEC mains connector on the back of the
N 975. You will need a flat-headed screwdriver to
open the fuse holder.
1. Carefully open the fuse holder cover with a
screwdriver (see diagram).
2. Remove the module and the white plastic
fuse holder. .
At the back of the white plastic fuse holder
are the voltage indicators (230V / 115V).
3. Turn the fuse holder over (see diagram)
and re-insert it into the module so that the
correct voltage is visible from outside,
showing through the window of the module.
Package the PEM 975, N 975 and accessories in
the transport case they were supplied in – this
protects them from shock and damage. Store the
case in a dry and ventilated place.
Incorrect opening of the fuse holder / voltage
change switch can cause damage, be very
careful when opening it. It is important that you
read the following instructions before you start. If
any damage does occur to the N 975, send it to
Microtech Gefell GmbH for repair (your local
Microtech Gefell distributor can help you with
this).
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4. Re-insert the module carefully until it clicks
into place. ..
The N 975 will now operate only on the new voltage.
7.2 Setting the level ranges
With the 5-stage rotary GAIN switch, the
amplification can be adjusted in steps of 12dB
between -36dB and +12dB.
1. Set the PEM 975 up and do a test
recording. The sound pressure level at the
microphone should correspond to the
operating level of the event. Watch the
peaks and leave enough headroom so you
don’t have to re-adjust levels during
recording or transmission. .
2. Set the rotary GAIN control on the N 975 so
that the correct level is sent to the following
equipment.
7.3 Setting grounding
The N 975 power supply is delivered as standard
with pin-1 of the XLR-3M OUTPUT socket
connected to GROUND. This means that the
microphone ground (PEM 975 and N 975) is
connected to the ground of the downstream device.
Depending on the grounding of the following
devices, so-called “ground loops” can develop. If
this happens it is possible to disconnect the
grounding between the N 975 and the following
devices.
1. Slide the earth lift switch (OUTPUT PIN 1)
on the back of the N 975 to the FLOAT
position. This disconnects pin-1 of the
XLR-3M OUTPUT connector from system
ground.
8 Use of accessories
The PEM 975 is a self-contained microphone, the
only accessory we would recommend is the use of
a vibration-absorbing mat underneath the
microphone to minimise any noise transmitted to
the microphone by the presenter hitting the desk.
9 Cleaning and Maintenance
1.1 Cleaning
1. The PEM 975 and accessories should only be
cleaned with a soft lint-free cloth.
If the amplification is set too high, there is the risk
that the following equipment connected to the
N 975 power supply unit will be destroyed.
Therefore, always set the rotary GAIN control to
-36dB, before switching on the N 975.
If the red LEDs of the N 975’s level meter are
flashing. The microphone is overmodulated and
is sending a distorted signal to the output
(OUTPUT). If this happens, reduce the GAIN
setting of the N 975.
Never use chemicals nor aggressive or abrasive
cleaners on the PEM 975 system as these could
scratch or damage the microphone.
Keep the microphone away from all forms of
pollution that could damage the microphone.
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9.2 Maintenance
Before each use check the microphone and
accessories to make sure that all parts are in
perfect condition. For a permanent installation, the
microphone and accessories should be checked on
a regular basis to ensure that they are in proper
condition and no mounting parts have become
loose. For long term reliable use, Microtech Gefell
GmbH recommends that the microphone be
returned for checking and cleaning after an
appropriate period of time.
10 Guarantee
Microtech Gefell GmbH guarantee products against
manufacturing defects for a period of two years
from first sale (or for one year in the case of a
second-hand item that has been checked and
serviced by Microtech Gefell’s Service Department
before re-sale). In each case, starting from the date
of invoice to the end user. The Guarantee excludes
any defects or damage caused by negligent or
improper treatment or incorrect installation or non-
compliance with the specifications given by
Microtech Gefell GmbH or the technical
specifications specified on the relevant data sheets,
or the use of inappropriate accessories or any
modification of the original parts by the customer or
their contractor, or by any third parties not
commissioned by Microtech Gefell GmbH. Regular
wear and tear is also excluded from the Guarantee.
If the microphone grill becomes damaged or
blocked in any way please contact the Service
Department at Microtech Gefell GmbH (your local
Microtech Gefell Distributor can help you with
this).
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11 Disposal of old equipment
Protect the environment: To avoid risk to health
or the environment, this product should not be
disposed of with normal household waste. At the
end of its life cycle it should be bought to a recycling
point for the recycling of electrical and electronic
devices. For more information please contact yout
municipal authority or local government. This is an
important contribution to recycling (EU directive
2002/96/EC).
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Microtech Gefell GmbH ·Georg-Neumann-Platz ·07926 Gefell ·Germany
Phone [phone] ·Fax [phone] ·www.microtechgefell.de ·[e-mail]
M.DE 201180.01 (31.08.2016) c Microtech Gefell GmbH