1600T

3. Type 1600T can be used to measure various general purpose microphones. Please

note that the measured results (including sensitivity and frequency response) are refer

to the condition of “Near Field” (35 mm from the artificial mouth). These results may

differ slightly from those measured under far field condition. The later condition is often

It is proposed to use 1600M for the measurement of general purpose microphones. The measured results are refer to far field condition.

1600T can test speedy the frequency response, 1kHz sensitivity, 1KHz distortion, Current of ECM etc. characteristics of the aforementioned transmitter.

*The fundamental combination of Type 1600T*
Item	Model No.	Description	Usage
1.	160 A	Electroacoustic 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.	167	R / T Testing Adapter	Combines with 160 or 170 mainframe, to test the frequency response curve sensitivity & impedance 、 distortion etc. characteristics of the receiver and transmitter.
4.	140 M	Artificial Mouth	Generates a flat and stable、precise sound field, for testing the “Transmitter".
5.	ETF - 1	Transmitter Test Fixture	Used to position the artificial mouth, to test the transmitter and condenser microphone.
6.	186 ( Option )	Sorting Driver	Please refer to Note as below.
7.	X-Y Mouse	Mouse	Replace the upward, downward, leftward, rightward and enter keys on the keyboard.
8.	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.

　Note :

Model-186 Sorting Driver when combined for use with Model – 160A ( or Model – 184 ) mainframe and user’s automatic sorting machine, can perform the automatic sorting which totally can be divided into 14 ranks. The sensitivity sorting is divided into 12 ranks (which are the same as the number of rank for the sensitivity sorting on the testing screen); Frequency response ranked at 13^th , while the other testing items, like : The impedance, distortion, ECM current etc. of the unqualified items ranked at 14^th (When the indicators of the 1st~13^th rank did not light up, it belongs to 14^th rank). Model-186 is very suitable for use in the automation for the receiver, transmitter and microphone factories.

Functions and Specifications of Type 1600 T

(1) 1 kHz sensitivity : Test range = .- 20 dB V /μbar ～ - 110 dB V /μbar.

= 0 dB V/Pa to -90 dB V/Pa. in two ranges, automatically ranging.

(2) Frequency response : Sweep range can be set from any two frequencies between 100 Hz to 10 kHz, the narrower the range and the faster the speed. The interval of sampling frequency points can be set from 1/12 to 1/48 octave. The upper and lower limits of the frequency response can be set by the user. “Best fit” or “1 kHz normalization” method can be selected for the PASS/FAIL judgment of frequency response. Two response curves can be stored (two colors) for comparison purpose. The dB value of a curve at any frequency can be read out.

Test speed : If the instrument is set to 200 to 5 kHz, 1/12 octave, totally only 1.0 second is required for test its sensitivity at 1 kHz, frequency response curve and judgment of PASS/FAIL.

(3) Distortion at 1 kHz : One of the following harmonic distortion can be selected: 2nd, 3rd, 2nd and 3rd, 2nd to 4th, 2nd to 5th, and THD. Measurable distortion range is from 0.2% to 20%. The upper limit can be set by the user for PASS/FAIL judgment. The sound pressure level can be set by the user from 88 to 118 dB SPL (-6dB Pa to +24 dB Pa).

Distortion measurement should be carried out in an anechoic chamber or in a very quiet room. However, sensitivity and frequency response can be measured in noisy environment.

(4) ECM current : Automatic testing the ECM DC current, 0.001 to 3.000 mA, +/-(1.2%+0.002 mA).

(5) ECM voltage supply : The DCV is fed by Model-167. The open circuit voltage is ranging from 0.9 V to 9 V which can be set by the user. The set voltage is displayed on screen.

Tolerance of voltage setting : +/-(0.5%+0.01V)

(6) ECM loading resistance : Provided by Model - 167. The value can be adjusted from the front panel, ranging from 0.2 k to 10 kΩ +/-(1%+0.01kΩ). The set value will also be displayed on screen.

(7) Statistics : Statistic analysis of the number and percentage of passed and failed products.

(8) Print out : A printer (option) can be connected to Type 160 to print out the test report of above items 1 to 7. (All the HP DeskJet or HP Laser Printers that are supported by DOS can all be used.)

(9) Automatic judgment : The upper and lower limits can be set freely for above items 1 to 4. The instrument will check PASS/FAIL automatically and the result will be displayed on screen. The set limits are stored on disk so that next time it is not necessary to set the limits again. Different limits can be set & stored in different disks for other types of transmitters or microphones if required.

(10) Automatic sorting : According to the measured sensitivity, several groups can be established (the number of group can be set by the user). The number and percentage of the measured objects in each group can be displayed and printed out.