Table of Contents
Advertisement
mended
by
ANSI
standards
for
measurements on hearing aids. Pre-
punched holes locate it accurately
on the chart bed
,
and also enable it
to be filed in binders to both Euro-
pean
and
U .S
.
standards.
Charts
are available in packages of 250 un-
der the order number QP 0009
.
Mechanical Design
The mechanical design of the in-
strument is simple and robust. The
carriage which supports the writing
system and the pen drive itself are
both driven by stepping motors via
toothed
belts
.
This
method
mini-
mises mechanical coupling and vi-
bration
transmission.
The
motor
bearings and other moving parts are
self-lubricating for long trouble -free
service.
Input Section:
Frequency Range: 100Hz to 10kHz
Dynamic Range
:
1 00 dB with automatic
range switching
Measuring Range:
25 1.N to 2 ,5 V with
input sensitivity of approximately 0 dB
With microphone of nominal sensitivity
1 2
,
5 mV
/
Pa
:
40 to 1 40 dB SPL
With accelerometer of nominal sensitiv
-
ity
1 mV
/
ms-
2:
25
mms-
2
to
2
,
5 kms
-
2
Sensitivity Adjustment:
-
14 to
+
4 dB
preset potentiometer
Input
Impedance:
1 00 kO
-
direct
.
1 Gn
II
3 pF via Microphone Preamplifier
Type 2642 supplied
Max. Input Voltage: 4,5 V peak
Preamp
.
Supply
Voltage: +
28 V output
via 10 kn
Mic. Polarization Voltage:
+
200 V
out-
put via 1 00 kn
Analyzer Section:
Bandwidth
(-
3
dBl:
1
5%
of filter centre
frequency
Centre
Frequency:
Automatically
stepped in
7%
increments from 100Hz
to 10kHz
Minimum Measurable Distortion:
1%
Sweep Speed: Automatic
-
depends on
signal analyzed
Detector Characteristic: RMS
Time Constant: 50 ms
Recorder Section:
Modes and Test Duration (typical):
Frequency Response
40s
Microphone Power Supply
The preamplifier is connected via
a 5 pin socket on the rear of the in-
strument carrying both the preampli-
fier supply voltage (28 V) and the
200 V microphone polarization vol
-
tage. The Microphone Type 4134,
which
is screwed directly to the
Type
2642
Preamplifier,
is
con-
nected to the coupler DB 0138 via
an adaptor ring DB 0225
.
The 1
inch Microphone Type 41 44 fits di
-
rectly to the coupler but must be
connected to the Preamplifier via an
adaptor DB 0962. The Ear Simula-
tor Type 4157 has a Microphone
Type 41 34 built in, and connects di-
rectly
to
the
Preamplifier
.
See
Fig.13.
Specifications 211 6
Harmonic Distortion (2nd and 3rd)
30 s
lntermod
.
Distortion (2nd and 3rd)
30 s
Amplitude Correction (Read-in)
35 s
Pen Return
14s
Measuring Parameter Indication
9 s
Chart
Size:
A5
(DIN)
size -148 by
2 1 0
m m (
5
,
8 by 8
,
3 in)
Writing Area
:
80 by 105 mm (3.2 by
4
,
2 in)
Pens:
Disposable fibre pens
.
Colour
-
green
.
red or black
Generator Section:
Output Signal
:
Single sine tone with fre
-
quency automatical ly stepped in
1
. 8%
increments for frequency response and
2nd and 3rd harmonic distortion records
Two sine tones with fixed frequency dis
-
placement
of
1
to
1 ,4 automatically
stepped in
1,8%
increments for 2nd and
3rd intermodulation distortion records
Max.
Output: 5 V ( 1 A) RMS giving 3 VA
into 80 load
Amplitude Control: Manual control from
0 to
-
40 dB in 5 dB steps
Automatic
correction
from
0
to
-
38
,
1 dB in 0,3 dB steps
Environmental Conditions:
Temperature:
+ 5
to
+ 40°
C
(
+
41
to
+
1
04°
F) operating
-1 0 to
+50°
C (+ 14 to
122°
F) storage
Humidity:
0 to
90%
relative humidity
without condensation
Power Requirements:
100. 115
,
127
,
200. 220 and 240V
Micropho ne
Preamplifier
Type 2642
Adaptor
One inch
DB
Microphone
Type 4144 2 cm
3
Coupl er
D
0138
790019
Fig.13.
Microphones, Preamplifier. Coupler
with adaptors. and Ear Simulator
Type 4157
AC
±
10%
(50 to 60Hz)
,
27 VA
.
Com
-
plies with safety Class I of IEC 348
Dimensions:
Height:
Width
:
Depth
:
142 mm (5
,
6 in)
420 mm (16,9 in)
320 mm ( 12
,
9 in)
Weight:
6
,
5 kg (14,31b)
Accessories Included
:
1 Microphone Preamplifier Type 2642
1
1/
2 inch Condenser Microphone Type
4134
1 1 inch Microphone Adaptor
Pa ck of 250 Recorder Charts
6 Fibre Pens (2 black. 2 green
,
2 red)
1 4 pin Generator Output plug
DB 0962
OP 0009
01 0003
JP 0402
Instruments and Accessories Available:
Anechoic Test Chamber Type 4222
Sound Level Calibrator Type 4230
Pistonphone Type 4220
1
inch
Cond enser
Microphone
Type
4144
2 cm3 coupler in accordance
with IEC R 126
-
1961 and
ANSI S
.
3
.
7
-
1973
Ear Simulator Type 4157
Adaptor for mounting 1
/
2 inch
Microphone on DB 0138
coupler
Set of 6 black fibre pens
Set of 6 red fibre pens
Set of 6 green fibre pens
DB 0138
DB 0225
01 0004
01 0005
01 0006
Advertisement
Table of Contents
