Type 1600H Headphone Measuring System
Main Functions
The
following items of earphone and headphone can be measured:
(1) Frequency response
(2) Sound pressure sensitivity at 1 kHz (1 kHz can be changed)
(3) Average sensitivity of sound pressure within a frequency range
(4) Polarity
(5) DC Resistance (DCR)
(6) AC Impedance (ACZ)
(7) Distortion at 6 points
(8) Fo
(9) Qe
(10) Qt
(11) Qm
(12) Automatic PASS/FAIL judgment of above items (1) to (7)
(13) Curve of distortion against frequency
(14) Curve of distortion against SPL
(15) Curve of AC impedance.
| Catalogue | Example of Testing Screen |
|
The fundamental combination of Type 1600 H |
|||
|
Item |
Model No. |
Description | Usage |
|
1. |
160 A |
Electro acoustic Analyzer |
Mainframe. To control and process the input、output signal. |
|
2. |
Monitor & Keyboard |
High Resolution Color Display Monitor & Keyboard |
Display the tested results & data and key in data. User may buy these two items at his local market, since price is cheaper and can save freight charge and import tax. |
|
3. |
171 |
Electro acoustic Testing Adapter |
Combines with 160 mainframe, to test the freq. response curve、sensitivity、impedance、Fo、polarity、distortion 、 parameter etc. of the loudspeaker 、 headphone 、 speaker box. |
|
4. |
142 EH |
Artificial Ear ( 142 EH = IEC - 318 ) |
Receives the sound generated from the headphone. 142EH is more suitable than Model-142EA-S for testing the headphone, since its frequency range is wider. |
|
5. |
X-Y Mouse |
Mouse |
Replace the upward, downward, leftward, rightward and enter keys on the keyboard. |
|
6. |
HP Printer ( Option ) |
Printer (All the HP DeskJet or HP Laser Printers that are supported by DOS can all be used.) |
Print out the tested results & data. |
Functions and Specifications of Type 1600 H
(1) Frequency response curve : Sweep range can be set from any two frequencies between 20 Hz to 20 kHz. The
interval of sampling frequency points can be set from 1/12, 1/24 or 1/48 octave (1/12 Oct. means 12 points in one
octave). Two response curves can be stored (two colors) for comparison purpose. The dB value of each curve at
any
frequency, or the difference between two curves can be read out directly.
Dynamic
range of frequency response : 70 dB in two
ranges: 50 to 120 dB SPL and 70 to 140 dB SPL.
Test
voltage for response measurements can be set freely : 0.005V
to 5.000V. Accuracy
: +/- (0.8%+0.0003V), Resolution: 0.001V.
Set
of the upper and lower limits of the frequency response : Use
1 to 5 earphones to draw 5 reference curves on screen. This system will expand
+/- X dB automatically according to the outline of the curves to form the upper
and lower limit curves. The value X can be set by the user. After that, any
point at each curve can be modified freely to fit the real requirement. When
frequency response is measured, the measured curve is compared with the limits
to determine PASS or FAIL automatically, and a beep means fail.
Tolerance in frequency response and sensitivity test :
(A)
Main unit 171: +/- 0.1 dB (50 Hz to 20 kHz);
+0.1/-0.3 dB (20 Hz to 30 kHz).
(B) 142EH measuring microphone in artificial ear: -46.0 dB V/μbar +/- 0.5 dB @ 1 kHz; Frequency response
+/-
1 dB (30 Hz to 7 kHz) , +/- 1.5 dB (20 Hz to 20 kHz).
(2), (3) Sound pressure sensitivity : After the sweep, the 1kHz Sound pressure sensitivity is displayed automatically.
The average value of dB SPL (average sound pressure sensitivity) is than calculated automatically within the
frequency range f1 to f2 and displayed. Values of f1 and f2 can be set freely in the range of 20 Hz to 20 kHz. The
upper and lower limits for these two sensitivities can be set respectively and the automatic PASS/FAIL judgment
will
be performed and displayed.
(4)
Polarity :
1600H can measure the polarity of earphone and
headphone directly.
(5),
(6) and (15) DCR, ACZ and Impedance curve :
DCR
: Test range from
0.00Ωto
1000Ω,
Accuracy : +/- (1% of rdg. + 0.05Ω),
Resolution: 0.01Ω.
ACZ : Test range from 0.00Ω to 4000Ω, Accuracy : +/- (1% of rdg. + 0.05Ω), for ACZ<1 kΩ
+/- 2% of rdg. for ACZ = 1kΩ to 4kΩ ; Resolution: 0.01Ω.
Impedance curve : Impedance curve can be drawn out in any band within the range of 20 Hz to 30 kHz.
(7),
(13) and (14) Distortion measurement :
There are three modes:
(A) Distortion measurement at six frequency points: Six fundamental frequencies can be set
freely within the range 20 Hz to 10 kHz. The fundamental frequency points can be chosen from
1 to 6, and the less the faster. Test voltage can be set from 0.02 V to 5 V. The upper limit of
distortion
can be set from 0.2% to 20%. Automatic PASS/FAIL judgment will be performed.
(B) Distortion curve measurement : Distortion curve can be automatically measured within the
range
fL to fH, in step 1/12, 1/24 or 1/48 Oct. Test voltage can
be set from 0.02 V to 5 V.
(C) Curve of distortion against SPL : Each of three frequencies chosen in the range from 20 Hz
to 10 kHz is fed to earphone or headphone under test. The feeding voltage increases from small
to large gradually. The SPL and its distortion are then measured and the results are shown as
three
curves in red, yellow and green. The SPL range is from 100 dB to 140 dB.
For
the above three distortion measurement, the test range is from 0.1% to 20%. One
of the following harmonic distortion can be selected: 2nd, 3rd, 4th, 5th, 6th,
7th, 2nd and 3rd, 2nd to 4th, 2nd to 5th, and THD.
(8) to (11) Fo, Qe, Qt and Qm : Automatic search of Fo, and displayed digitally. Test range from 13 Hz to 3 kHz with tolerance of +/- 1% , Resolution : 0.1 Hz.
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