Extron electronic Stereo Amplifier MDA 3 Series User Manual

User’s Manual  
VersaTools® MDA 3 Series  
Video and Audio Mini Video Distribution Amplifiers  
Extron Electronics, USA  
1230 South Lewis Street  
Anaheim, CA 92805  
USA  
Extron Electronics, Europe  
Beeldschermweg 6C  
3821 AH Amersfoort  
The Netherlands  
Extron Electronics, Asia  
135 Joo Seng Road, #04-01  
PM Industrial Building  
Singapore 368363  
Extron Electronics, Japan  
Kyodo Building  
16 Ichibancho  
Chiyoda-ku, Tokyo 102-0082 Japan  
+81.3.3511.7655  
68-607-01 Rev. D  
06 06  
714.491.1500  
+31.33.453.4040  
+65.6383.4400  
Fax 714.491.1517  
Fax +31.33.453.4050  
Fax +65.6383.4664  
Fax +81.3.3511.7656  
© 2006 Extron Electronics. All rights reserved.  
 
 
Introduction ................................................................................ 1  
Installation................................................................................... 2  
Rack mounting ............................................................................ 2  
Back of the rack mounting ........................................................ 4  
Furniture or projector mounting............................................. 6  
Connections, Controls, and Indicator ............................ 7  
S-video (MDA 3SV, MDA 3SVA, MDA 3SV Dual) ..................... 7  
Composite video (MDA 3V, MDA 3AV, MDA 3V Dual) ........... 8  
Audio on captive screw connectors  
(MDA 3AV, MDA 3SVA, MDA 3A) ............................................ 8  
Audio on RCA connectors (MDA 3A RCA) ............................ 10  
Power (all models) .................................................................. 10  
Specifications ........................................................................... 12  
All trademarks mentioned in this manual are the properties of their respective owners.  
68-607-01 Rev. D  
06 06  
VersaTools® MDA 3 Series • Table of Contents  
i
 
Table of Contents, cont’d  
Introduction  
The Extron MDA 3 Series of Mini Distribution Amplifiers  
(MDAs) are a family of eight one-input, three-output, video and  
audio distribution amplifiers. The MDA series distribution  
amplifiers (DAs) split one composite video or S-video input  
and/or audio input for output to multiple destinations with no  
loss of signal quality. The MDA are members of the Extron  
VersaTools® line of basic distribution amplifiers, switchers, and  
associated video accessories.  
The MDAs distribute composite video, S-video (luminance (Y)  
and chrominance (C)), and/or balanced or unbalanced audio on  
captive screw connectors, or unbalanced audio on RCA  
connectors, in the following combinations:  
screw connectors)  
Composite video  
Audio (captive  
conneAcutdorios)(RCA  
S-video  
Distribution  
Amplifier  
Part #  
MDA 3SV  
MDA 3SVA  
60-444-01  
60-444-20  
MDA 3SV Dual 60-444-10  
2
MDA 3V  
60-439-01  
60-439-20  
60-439-10  
60-440-01  
60-440-30  
MDA 3AV  
MDA 3V Dual  
MDA 3A  
2
MDA 3A RCA  
2 = Two separate DAs.  
The MDAs ship with external desktop 12 V power supplies that  
accept 100 to 240 VAC, 50 Hz or 60 Hz input.  
VersaTools® MDA 3 Series • Table of Contents  
ii  
VersaTools®MDA3SeriesIntroduction  
1
 
VersaTools® MDA 3 Series, cont’d  
Installation  
The MDA 3 Series mini distribution amplifiers (DAs) can be  
mounted on a rack shelf, to a rack without a shelf, under a desk  
or tabletop, or on a projector bracket.  
Rack mounting  
For optional rack mounting, mount the MDA on any of the  
following rack shelves:  
D
IS  
TR  
IB  
U
T
IO  
N
A
M
P
L
IF  
IE  
R
RSF 123 VersaTools® rack shelf kit (part #60-190-20)  
IS  
T
D
VersaTools Rack Shelf  
R
IB  
U
T
IO  
N
A
M
P
L
IF  
IE  
R
(figure 1)  
1/4 Rack Width False Front  
Face Plate  
RSB 123 VersaTools rack shelf (part #60-604-20)  
RSU 126 6" deep universal rack shelf kit (part #60-190-10)  
RSB 126 6" deep basic rack shelf (part #60-604-10)  
D
IS  
T
RSU 129 1U universal rack shelf kit (part #60-190-01)  
(figure 2)  
Use 2 mounting holes on  
opposite corners.  
R
IB  
U
T
IO  
N
A
M
P
L
IF  
IE  
R
(2) 4-40 x 3/16" Screws  
RSB 129 1U basic rack shelf (part #60-604-01)  
Figure 1 — Rack mounting the MDAs on a  
VersaTools rack shelf  
On the standard rack shelf, the MDA mounts in one of four  
locations to the rear of the rack or in one of four locations to the  
front of the rack.  
1.  
If feet were previously installed on the bottom of the  
MDA, remove them.  
D
2.  
Mount the MDA on the rack shelf, using two 4-40 x 3/16"  
screws in opposite (diagonal) corners to secure the MDA  
to the shelf.  
IS  
T
R
IB  
U
T
IO  
D
IS  
T
R
IB  
U
T
IO  
N
A
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P
L
IF  
IE  
R
D
IS  
T
R
IB  
U
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N
A
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P
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IF  
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R
3.  
Install blank panel(s) or other unit(s) to the rack shelf.  
Only products in the VersaTools line can be mounted to a  
VersaTools shelf. Any 1U rack-mountable Extron  
product can be mounted on the standard shelf.  
M
D
D
A
IS  
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S
N
R
IB  
E
A
U
R
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I
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S
M
P
L
IF  
IE  
R
Figure 2 — MDAs mounted on a standard rack  
shelf  
VersaTools® MDA 3 Series • Installation  
2
VersaTools® MDA 3 Series • Installation  
3
 
VersaTools® MDA 3 Series, cont’d  
Back of the rack mounting  
The MDA can be mounted to the rear of a rack using the Extron  
MBB 100 VersaTools® back of the rack mounting kit  
(part #70-367-01) (figure 3). The kit allows the product to be  
vertically mounted to the front or rear rack supports and facing  
either towards the front or the rear of the rack.  
Rear  
Front  
I
R
1
U
2
3
DISTRIB  
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P
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S
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6
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8
1
2
3
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P
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6
7
8
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A
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A
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D
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B
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Figure 3 — Attaching the back of the rack kit  
1.  
2.  
3.  
Remove feet from the bottom of the MDA if they are  
installed.  
Remove two screws from one side of the unit. Retain the  
screws for possible later reassembly without the bracket.  
Figure 4 — Typical back of the rack installations  
Attach one bracket to the side of the unit using the longer  
screws included in the kit.  
4.  
5.  
Repeat steps 2 and 3 on the other side of the unit.  
Mount the unit to the rack using the two included rack  
screws (figure 4). The MDA can be vertically mounted  
facing in either direction.  
Only VersaTools products and most IP Link products  
can be mounted using the back of the rack mounting kit.  
VersaTools® MDA 3 Series • Installation  
4
VersaTools® MDA3Series Connections andControls  
5
 
VersaTools® MDA 3 Series, cont’d  
8.  
For projector mounting, secure the MDA to a projector  
mount or other surface by inserting the mounting bolt  
through the bracket’s slotted hole.  
Furniture or projector mounting  
Furniture mount or projector mount the MDA using the  
optional Extron MBU 123 VersaTools® under desk mounting kit  
(part #70-212-01); or VersaTools® PMK 100 mini projector  
mounting kit (part #70-217-01) as follows:  
Connections, Controls, and Indicator  
See figure 6, figure 7, and figure 11 to make the following connections. The  
figures show all of the combinations of connectors that you may encounter  
with your MDA.  
1.  
Attach the mounting brackets to the MDA with the  
machine screws provided (figure 5).  
S-video (MDA 3SV, MDA 3SVA, MDA 3SV Dual)  
Input connector (s) — Connect an S-video input to this 4-pin  
mini DIN connector (figure 6 and figure 7). On the Dual model  
(figure 7), Input A and Input B are completely separate inputs to  
two separate distribution amplifiers.  
1
Mounting  
Bolt  
Projector  
Mounting  
Bracket  
2
1
Projector  
MDA 3SVA,  
Rear Panel  
INPUT  
OUTPUTS  
MDA 3SVA  
D
I
S
T
R
I
B
1
2
U
3
T
I
O
POWER  
12V  
.5A MAX  
N
A
M
P
L
I
F
I
E
R
INPUT  
OUTPUTS  
R
BAL  
L
R
L
1
R
L
2
L
3
R
1
2
3
UNBAL  
Under Desk Mounting  
Projector Mounting  
Figure 5 — Desk and projector mounting the MDAs  
6
7
10  
5
4
3
MDA 3AV,  
Rear Panel  
2.  
3.  
If feet were previously installed on the bottom of the  
MDA, remove them.  
MDA 3AV  
For furniture mounting, hold the MDA with the attached  
brackets against the underside of the table or other  
furniture. Mark the location of the screw holes of the  
bracket on the mounting surface.  
O
U
T
I
N
1
2
3
POWER  
12V  
.34A MAX  
INPUT  
OUTPUTS  
BAL  
L
R
L
1
R
L
2
R
L
3
R
4.  
5.  
For furniture mounting, drill 3/32" (2 mm) diameter pilot  
holes, 1/4" (6.3 mm) deep in the mounting surface at the  
marked screw locations.  
1
2
3
UNBAL  
6
7
10  
5
For furniture mounting, insert #8 wood screws into the  
four pilot holes. Tighten each screw into the mounting  
surface until just less than 1/4" of the screw head  
protrudes.  
Figure 6 — MDA 3 Series front and rear panels  
Out connector or Outputs (1 through 3) connectors — Connect  
up to three S-video devices to these 4-pin mini DIN connectors.  
On the Dual model, the A output signals are identical to the A  
input, and the B output signals are identical to the B input.  
2
6.  
7.  
For furniture mounting, align the mounting screws with  
the slots in the brackets and place the MDA against the  
surface, with the screws through the bracket slots.  
For furniture mounting, slide the MDA slightly forward or  
back, then tighten all four screws to secure the MDA in place.  
®
VersaTools® MDA3Series Connections andControls  
7
6
VersaTools MDA 3 Series • Connections and Controls  
 
VersaTools® MDA 3 Series, cont’d  
Tip  
Ring  
Sleeve (s)  
Tip  
Tip  
Sleeve  
2
1
MDA 3SV Dual,  
Rear Panel  
Tip  
Sleeve  
Ring  
MDA 3SV  
DUAL  
A
0.2” (5 mm) max.  
Do not tin the wires!  
Balanced Stereo Input  
(high impedance)  
Unbalanced Stereo Input  
(high impedance)  
1
2
3
3
POWER  
12V  
.5A MAX  
Figure 8 — Captive screw input connector wiring  
B
When making connections for the MDA from existing  
audio cables, see figure 9. A mono audio connector  
consists of the tip and sleeve. A stereo audio connector  
consists of the tip, ring and sleeve. The ring, tip, and  
sleeve wires are also shown on the captive screw audio  
connector diagrams, figure 8 and figure 10.  
2
1
INPUT  
OUTPUTS  
10  
1
2
4
3
MDA 3V Dual,  
Rear Panel  
Tip  
Sleeve  
Tip (Left)  
Sleeve (Gnd)  
MDA 3V  
DUAL  
A
B
1
1
2
3
Ring (Right)  
Tip (Left)  
POWER  
12V  
.5A MAX  
Tip (Signal)  
Sleeve (Gnd)  
Sleeve (Gnd)  
Unbalanced Stereo  
2
3
INPUT  
Unbalanced Mono  
OUTPUTS  
Figure 9 — Phono audio connectors  
4
10  
3
Audio Outputs (1 through 3) connectors — Connect up to three  
balanced or unbalanced audio devices to these 3.5 mm, 5-pole  
captive screw connectors. Connect audio devices, such as an  
audio amplifier or powered speakers. See figure 10 to properly  
wire an output connector.  
6
Figure 7 — MDA 3SV Dual and MDA 3V Dual rear  
panels  
Composite video (MDA 3V, MDA 3AV, MDA 3V Dual)  
Tip  
Tip  
Ring  
In connector or Input connector — Connect a composite video  
input to this BNC connector. On the Dual model (figure 7),  
Input A and Input B are completely separate inputs to two  
separate distribution amplifiers.  
3
Left  
Left  
NO GROUND HERE.  
Sleeve(s)  
Tip  
Tip  
Ring  
Right  
Right  
NO GROUND HERE.  
0.2” (5 mm) max.  
Do not tin the wires!  
Unbalanced Stereo Output  
Balanced Stereo Output  
Out connector or Outputs (1 through 3) connectors — Connect  
up to three composite video devices to these BNC connectors.  
On the Dual model (figure 7), the A output signals are identical  
to the A input, and the B output signals are identical to the B  
input.  
4
Figure 10 — Captive screw connector wiring for  
audio output  
Connect the sleeve to ground (Gnd). Connecting  
the sleeve to a negative (-) terminal will damage the  
audio output circuits.  
CAUTION  
Audio on captive screw connectors (MDA 3AV,  
MDA 3SVA, MDA 3A)  
Audio Input connector — Connect a balanced or unbalanced  
audio input to this 3.5 mm, 5-pole captive screw connector.  
Connectors are included, but you must supply the audio cable.  
See figure 8 to wire a connector for the appropriate input type  
and impedance level. High impedance is generally over 800 ohms.  
5
®
VersaTools® MDA 3 Series • Connections and Controls  
8
VersaTools MDA 3 Series • Connections and Controls  
9
 
VersaTools® MDA 3 Series, cont’d  
Bal(anced)/Unbal(anced) DIP switches — For each balanced  
7
audio output, set the associated DIP switch to the  
Balanced (up) position. For each unbalanced audio  
output, set the associated DIP switch to the  
Unbalanced (down) position.  
Smooth  
BAL  
Ridges  
A
A
SECTION A–A  
The balanced or unbalanced nature of the audio  
output is determined by the output connector  
wiring, not the audio input. Each output can be  
balanced or unbalanced independently of the other  
two outputs.  
1 2 3  
UNBAL  
Power Supply  
Output Cord  
Tie Wrap  
0.3” (7 mm) MAX  
Audio on RCA connectors (MDA 3A RCA)  
Orange Captive Screw  
Connector  
9
8
MDA 3A RCA,  
Rear Panel  
Figure 12 — Power connector wiring  
MDA 3A RCA  
1
2
3
The length of the exposed (stripped) copper wires is  
important. The ideal length is 0.3" (7 mm).  
Longer bare wires can short together. Shorter wires  
are not as secure in the captive screw connectors  
and could be pulled out.  
L
CAUTION  
POWER  
12V  
.34A MAX  
R
INPUT  
OUTPUTS  
Use the supplied tie-wrap to strap the power cord to the  
extended tail of the connector.  
9
10  
8
Figure 11 — MDA 3A RCA rear panel  
Your MDA may have shipped with a blue captive  
screw connector. This blue connector can be plugged  
into either a blue or an orange power receptacle.  
Audio Input connectors — Connect an unbalanced stereo audio  
source to these L(eft) and R(ight) RCA connectors.  
8
9
The ideal length of exposed (stripped) copper wire  
for the blue connector is 0.2" (5 mm).  
Audio Outputs (1 through 3) connectors — Connect up to three  
stereo audio devices to these L(eft) and R(ight) RCA connectors.  
The blue connector does not have the extended tail or the  
included tie-wrap.  
Power (all models)  
Do not tin the stripped power supply leads before  
installing the captive screw connector. Tinned wires are  
not as secure in the captive screw connectors and could  
be pulled out.  
Power supply voltage polarity is extremely  
important. Applying power with incorrect voltage  
polarity could damage the power supply and the  
MDA. Identify the power cord negative lead by the  
ridges on the side of the cord.  
CAUTION  
To verify the polarity before connection, plug in the power  
supply with no load and check the output with a voltmeter.  
Power connector — Plug the external 12 VDC power supply  
into this 2-pole captive screw connector. The power supply is  
included with the unit. Figure 12 shows how to wire the  
connector.  
10  
The two power cord wires must be kept separate  
while the power supply is plugged in. Remove  
power before wiring.  
Power supply voltage polarity is critical. Incorrect  
voltage polarity can damage the power supply and  
the MDA. Identify the power cord negative lead by  
the ridges on the side of the cord (figure 12).  
CAUTION  
As an alternative, an Extron P/S 100 Universal 12 VDC Power  
Supply, part #60-357-01, can power multiple MDAs or other  
Extron 12 VDC devices using only one AC power connector.  
®
®
10  
VersaTools MDA 3 Series • Specifications  
VersaToolsMDA3SeriesSpecifications  
11  
 
VersaTools® MDA 3 Series, cont’d  
Power LED (figure 13) When lit, this LED indicates power is  
applied to the MDA.  
DC offset (max. allowable) ......... 5.0 V  
Input coupling.............................. AC  
11  
11  
Front Panel, all MDA Models  
Video output  
Number/signal type  
MDA 3SV/3SVA.............. 3 buffered S-video  
MDA 3SV Dual ................ 2 x 3 buffered S-video  
MDA 3V/3AV .................. 3 buffered composite video  
MDA 3V Dual .................. 2 x 3 buffered composite video  
Connectors  
DISTRIBUTION AMPLIFIER  
Figure 13 — MDA 3 Series front panel (all models)  
MDA 3SV/3SVA.............. (3) 4-pin mini DIN female  
MDA 3SV Dual ................ (6) 4-pin mini DIN female  
MDA 3V/3AV .................. 3 BNC female  
MDA 3V Dual .................. 6 BNC female  
Specifications  
Video  
Nominal level ............................... 1 Vp-p for Y of S-video and for composite  
video  
Gain ............................................... Unity  
0.3 Vp-p for C of S-video  
Bandwidth .................................... 100 MHz (-3 dB)  
Minimum/maximum levels ...... 0.4 V to 2.0 Vp-p, follows input  
Impedance .................................... 75 ohms  
Video input  
Number/signal type  
Return loss .................................... <-30 dB @ 5 MHz  
DC offset ....................................... 50 mV with input at 0 offset  
MDA 3SV/3SVA  
1 S-video  
Sync  
MDA 3SV Dual ................ 2 S-video  
MDA 3V/3AV ................... 1 composite video  
MDA 3V Dual .................. 2 composite video  
Connectors  
Standards ...................................... NTSC 3.58, NTSC 4.43, PAL, SECAM  
Audio — MDA 3AV, MDA 3SVA, MDA 3A/3A RCA  
Gain  
MDA 3SV/3SVA  
DIP switch set to match output type  
Unity (0 dB)  
DIP switch not matched to output type  
(1) 4-pin mini DIN female  
MDA 3SV Dual ................ (2) 4-pin mini DIN female  
MDA 3V/3AV ................... 1 BNC female  
MDA 3V Dual .................. 2 BNC female  
Output Wiring  
DIP Switch  
Setting  
Unbalanced Balanced  
Nominal level ............................... 1 Vp-p for Y of S-video and for composite  
Balanced  
Unbalanced  
0 dB  
+6 dB  
-6 dB  
0 dB  
video  
0.3 Vp-p for C of S-video  
Minimum/maximum levels ...... 0.4 V to 2.0 Vp-p for composite video or Y  
of S-video with no offset  
Impedance .................................... 75 ohms  
Return loss  
Frequency response ..................... 20 Hz to 20 kHz, 0.05 dB  
THD + Noise ................................ 0.03% @ 1 kHz at nominal level  
S/N  
MDA 3A ............................ >90 dB, unbalanced, at maximum output  
All other models w/audio >90 dB, balanced at maximum output  
Stereo channel separation .......... >80 dB @ 1 kHz; >60 dB @ 20 kHz  
CMRR ............................................ >75 dB @ 20 Hz to 20 kHz  
MDA 3SV/3SVA  
MDA 3SV Dual ................ <-25 dBB @ 0 to 10 MHz  
All other models .............. <-27 dB @ 5 MHz  
VersaTools® MDA 3 Series • Specifications  
®
12  
VersaToolsMDA3SeriesSpecifications  
13  
 
VersaTools® MDA 3 Series, cont’d  
Maximum level (Hi-Z)  
MDA 3A ............................ +15 dBV, unbalanced, at 1%THD+N  
All other models w/audio >+24 dBu, balanced at 1%THD+N  
Maximum level (600 ohm)  
Audio input — MDA 3AV, MDA 3SVA, MDA 3A/3A RCA,  
MDA 5A RCA  
Number/signal type  
MDA 3A RCA  
MDA 3A ............................ >+14 dBm, unbalanced, at 1%THD+N  
1 stereo unbalanced  
All other models w/audio >+15 dBm, balanced or unbalanced, at  
1%THD+N  
MDA 3AV, MDA 3SVA, MDA 3A  
1 stereo balanced/unbalanced  
Connectors  
General  
MDA 3A RCA  
External power supply ............... 100 VAC to 240 VAC, 50/60 Hz, 5 watts,  
external, autoswitchable; to 12 VDC,  
2 RCA connectors  
MDA 3AV, MDA 3SVA, MDA 3A  
1 A (max.), regulated  
(1) 3.5 mm captive screw connector, 5 pole  
Power input requirements  
Impedance  
MDA 3V/3SV ................... 12 VDC, 0.1 A (max.)  
MDA 3AV/3SVA............. 12 VDC, 0.3 A (max.)  
All other models .............. 12 VDC, 0.2 A (max.)  
MDA 3A RCA  
>10k ohms unbalanced, DC coupled  
MDA 3AV, MDA 3SVA, MDA 3A  
>50k ohms unbalanced, >25k ohms  
balanced, DC coupled  
Temperature/humidity .............. Storage: -40 to +158 °F (-40 to +70 °C) /  
10% to 90%, noncondensing  
Operating: +32 to +122 °F (0 to +50 °C) /  
10% to 90%, noncondensing  
Nominal level ............................... +4 dBu (1.23V), 0 dBu (0.775 V), -10 dBV  
(316 mV), -20 dBV (100 mV) compatible  
Rack mount ................................... Yes, with optional 1U rack shelf, part  
#60-190-01, or 60-604-01;  
Maximum level  
MDA 3A ............................ +17 dBu (unbalanced) at 1%THD+N  
All other models w/audio +24 dBu (balanced) at 1%THD+N  
or the VersaTools® rack shelf, part  
#60-190-20, or 60-604-20  
Enclosure type .............................. Metal  
0 dBu = 0.775 Vrms, 0 dBV = 1 Vrms, 0 dBV 2 dBu  
Enclosure dimensions ................. 1.7" H x 4.3" W x 3.0" D (1U high, quarter  
rack wide)  
Audio output — MDA 3AV, MDA 3SVA, MDA 3A/3A RCA  
Number/signal type  
4.2 cm H x 11.0 cm W x 7.6 cm D  
(Depth excludes connectors and knobs.)  
MDA 3A RCA .................. 3 stereo, unbalanced  
MDA 3AV, MDA 3SVA, MDA 3A  
3 stereo, balanced/unbalanced  
Product weight  
MDA 3V, MDA 3SVA ..... 0.4 lbs (0.2 kg)  
MDA 3V Dual .................. 0.7 lbs (0.3 kg)  
MDA 3AV ......................... 0.6 lbs (0.3 kg)  
MDA 3SV ........................... 0.4 lbs (0.2 kg)  
MDA 3SV Dual, MDA 3A . 0.5 lbs (0.2 kg)  
MDA 3A RCA .................. 0.4 lbs (0.2 kg)  
Shipping weight  
Connectors  
MDA 3A RCA .................. 6 RCA connectors  
MDA 3AV, MDA 3SVA, MDA 3A  
(3) 3.5 mm captive screw connectors, 5  
pole  
Impedance  
MDA 3V, MDA 3V Dual. 3 lbs (2 kg)  
MDA 3AV ......................... 3 lbs (2 kg)  
MDA 3SV, MDA 3SV Dual 2 lbs (1 kg)  
MDA 3SVA ....................... 2 lbs (1 kg)  
MDA 3A RCA ................... 2 lbs (1 kg)  
MDA 3A RCA  
50 ohms unbalanced  
MDA 3AV, MDA 3SVA, MDA 3A  
50 ohms unbalanced, 100 ohms balanced  
Gain error...................................... 0.1 dB channel to channel  
®
®
14  
VersaTools MDA 3 Series • Specifications  
VersaToolsMDA3SeriesSpecifications  
15  
 
VersaTools® MDA 3 Series, cont’d  
Vibration ....................................... ISTA 1A in carton (International Safe  
Transit Association)  
Listings .......................................... UL, CUL  
Compliances ................................. CE, FCC Class A, VCCI, AS/NZS, ICES  
MTBF ............................................. 30,000 hours  
Warranty ....................................... 3 years parts and labor  
All nominal levels are at 10%.  
Specifications are subject to change without notice.  
VersaTools® MDA 3 Series • Specifications  
16  
 

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