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Page 1
PINK NOISE GENERATOR
Output Level
(Level control at 10)
AUX LEVEL HI-Z MIC LEVEL LO-Z MIC LEVEL - 1 dBV (890 mV) -29 dBV (35 mV) -49 dBV (3.5 mV)
Spectrum
Equal energy
per octave pink noise, flat %I dB, 32 Hz
to 16 kHz
lmpedance
OUTPUT DESIGNED FOR USE WITH ACTUAL
Lo-Imp.
Mic Level 25- to 600-ohm microphone 110 ohms
circuits balanced
ABOVE 1 kHz ROLLOFF
Hi-Imp. FREQUENCY RESPONSE Mic Level 33-kilohm microphone circuits 2.3 kilohms
unbalanced FIGURE 2
Aux Level High-impedance (10 kilohms 1.5 kilohms
or more) unbalanced aux unbalanced
circuits
Mic Overload
ANALYZER
(Pink noise levels to turn on MIC OVERLOAD LED)
Sensitivity INPUT 15 d~ INPUT VOLTAGE SOUND ATTENUATOR PRESSURE USING (Pink noise levels to turn off LO LEDs; INPUT LEVEL ~~615 MICROPHONE
control fully clockwise) LO-imp. Mic. out -40 ~BV (10 mv) 122 d~ SPL
In -25 dBV (56 mV) 137 dB SPL
INPUT 15 dB INPUT VOLTAGE SOUND Hi-Imp. Mic. Out -17 dBV (0.14V) - ATTENUATOR PRESSURE USING In - 2 dBV (0.79V) - ES615 MICROPHONE
Lo-Imp. Mic. Out -117
dBV (1.4 pV) 45 dB SPL
In - 102 dBV (8 pV) 60 dB SPL
Hi-Imp. Mic. Out - 92 d BV (25 pV) - In -77 dBV (0.14 mV) - AUX - - 62 dBV (0.79 mV) -
FlatlES615 Switch
In ES615 position, complements low-frequency rolloff
characteristic of ES615 Microphone (see Figure 1)
t20
m +I0 z
W V)
5 % 0 Y W E -10
Y
-20 20 50 100 500 FREQUENCY IN HERTZ
ES615/M615 SYSTEM LOW
FREQUENCY RESPONSE
FIGURE 1
Above 1
kHz Switch
FLAT: Used for near-field measurements; produces
flat resultant frequency response.
ROLLOFF: Used for reverberant and far-field meas-
urements; produces resultant frequency response rolled
off at 3
dB per octave above 1 kHz (see Figure 2)
lnput Overload
(Pink noise aux input level to turn on INPUT OVERLOAD
LED; INPUT LEVEL control fully clockwise)
-25
dBV (56 mV)
HiILo Envelope
2 to 12 dB (-+I to k6 dB), adjustable
Aux Output Voltage Gain
INPUT GAIN - Lo-Imp. Mic +54 dB**
Hi-Imp. Mic +31
dB**
AUX -4 dB
'* lnput attenuator out
Impedance
INPUT DESIGNED FOR USE WITH ACTUAL - Lo-Imp. Mic. 25-
to 600-ohm microphones 950 ohms balanced
Hi-Imp. Mic. 33-kilohm
microphones 140 kilohms unbalanced
Aux 100-ohm to 10
kilohms high 42
kilohms unbalanced
level sources
OUTPUT DESIGNED FOR USE
WITH ACTUAL
Aux High-impedance (10 kilohms 4.7 kilohms unbalanced
or more) unbalanced aux (with MIC input in use)
circuits
Operating Voltage
M615: 108-132 Vac, 50/60 Hz, 5W
M615-2E: 90-125 or 180-250 Vac, 50/60 Hz, 5W
Temperature Range
Operating: -7" to 57°C (20" to 135°F)
Storage: -29"
to 71°C (-20" to 160°F)
Dimensions
See Figure 3
Page 2
OVERALL DIMENSIONS FIGURE
3
Weight
M615 M615AS
Net 2.2 kg (4 Ib 13 oz)
Combined Net 2.3 kg (4 Ib 15 oz) 5 kg (11 Ib)
Packaged 2.9 kg (6 Ib 7 oz) 5.6 kg (12 Ib 4 02)
CONTROLS AND CONNECTORS
PlNK NOISE LEVEL Control: Sets
pink noise generator
output level.
INPUT LEVEL Control: Sets
input signal level and LO
LED threshold to the analyzer.
ABOVE 1
KHz Switch: Selects either a flat resultant
high-frequency response or a smooth resultant
high-
frequency 3 dB per octave rolloff above 1 kHz.
INPUT OVERLOAD LED: Lights if
INPUT LEVEL control
is set too high for input signal level, causing erroneous
M615 LED indications.
MIC OVERLOAD LED: Lights with excessive micro-
phone input levels, indicating need to switch in 15 dB
attenuator or reduce pink noise level.
HI/LO ENVELOPE Control: Adjusts the HI LED threshold
relative to the LO LED threshold. The resultant fre-
quency response envelope may be varied from 2 to 12
dB
(%I to +6 dB).
HIILO LEDs: The LO LED for each octave lights if the
input signal within its octave is below the lower thresh-
old set by the INPUT LEVEL control. The HI LED for
each octave lights if the input signal is above the upper
threshold set by the
HI/LO ENVELOPE control.
PlNK NOISE GENERATOR OUTPUT
- AUX LEVEL Con-
nector: Provides
pink noise generator output connec-
tion to aux-level inputs.
PlNK NOISE GENERATOR OUTPUT
- MIC LEVEL Con-
nector: Provides
pink noise generator output connec-
tion to microphone-level inputs.
PlNK NOISE GENERATOR OUTPUT
- MICROPHONE MI-
PEDANCE Switch: Selects low- or high-impedance
pink noise generator microphone-level output.
MICROPHONE INPUT
- 15 dB ATTENUATOR Switch:
Reduces microphone input sensitivity to avoid micro-
phone preamplifier overload. Affects microphone input
only.
MICROPHONE INPUT
- FLATlES615 Switch: Selects
either flat response or low-frequency boost comple-
menting the response characteristics of the
ES615
Analyzer Microphone, making the system response flat.
Affects microphone input only.
MICROPHONE INPUT Connector: Provides microphone
input to analyzer. MICROPHONE INPUT
- IMPEDANCE
Switch: Selects
low- or high-impedance microphone input to analyzer.
AUX INPUT Connectors: Provides input to analyzer from
mixers, amplifiers or other aux level input signals. In
addition, accepts aux level output of pink noise gen-
erator (using the supplied cable) for self-testing
purposes. Automatically disables MICROPHONE INPUT
if plug is inserted.
AUX OUTPUT Connector: Provides for monitoring or
connection to accessory instrumentation. This con-
nector is in parallel with the analyzer AUX LEVEL input
connectors, or monitors the equalized microphone pre-
amplifier output if the AUX INPUT connectors are not
in use.
PRELIMINARY SETUP
The following should be performed prior to using the
M615AS Equalization Analyzer System:
1. Remove the protective cap from the grille assembly
of the
ES615 Analyzer Microphone. This cap should
be used during transit and storage only.
2. Install the tilt bracket assembly on the M615 Equal-
ization Analyzer as follows: Attach the No. 6-32
machine screws and
capnuts in the two lower holes
at the front of the M615 cover. Make certain the cap-
nuts are on the outside of the cover. Insert the ends
of the tilt bracket through the two upper holes at the
front of the M615 cover. Slip the plastic caps over
each end of the tilt bracket. Swing the tilt bracket
downward against the front panel so that the
machine screw heads provide a detent to stop the
bracket from sliding (see Figure
4). Note that the
M615 can be replaced in its carrying case with the
tilt bracket in place and extending straight outward
from the front panel.
M615
WITH TILT BRACKET
FIGURE
4
3. Model M615-2E: The Model M615-2E is supplied
with a detachable line cord without a three-pin male
power connector. Obtain a suitable three-pin male
plug and attach it to the line cord. The plug should
be installed by qualified service personnel. The
brown lead goes to the "hot" or "live" terminal, the
blue lead to the neutral terminal, and the
green/yel-
low lead to the ground or earth terminal. Select the
proper voltage range (90-125 or
180-250 Vac) using
the rear-panel VOLTAGE SELECTOR switch.