Type 1600 / 1840

in comparison with other types of test equipment used for similar purposes

1.   Automatic switching: Some other cheaper PC controlled instruments claim that they also have many functions and many test items. One of the reasons of their cheaper price is that the automatic switching and automatic ranging (see below) are not included. The “Quicker speed” claimed by these instruments only means the speed of testing one single parameter (or curve). When many parameters (or curves) should be measured, manual operation is necessary if there are no automatic switching and automatic ranging capacities, and it is easy to lead error or waste time in manual switching and ranging.

Automatic switching is the necessary capacity for full automatic and continuous test of various parameters. It also forms the basis of simpler, faster and error-free test. When different parameters are measured, the wiring of internal connection of the instrument and the loudspeaker are different. In Type 1600, when a single or many parameters (including frequency response) is/are to be measured, it has been switched and programmed automatically in advance. For the instruments without automatic switching & auto. ranging, manual operation is necessary which means uneasy and troublesome. Error is unavoidable if the user has not got deeper professional knowledge.

2.  Automatic ranging: This is the necessary means for choosing optimum test condition. Since the users may not know clearly the internal construction of the instrument, so that it is difficult for them to choose the optimum test range. Although the instrument can give the answer, however, larger error, poorer resolution or poorer repeatability (different answer for repetition test) may be resulted. The best solution is the use of automatic ranging. Type 1600 has not only the automatic switching capability, but also has full automatic ranging capacity. We can say, Type 1600 is a full automatic design. Not only Smaller error & better resolution, but also easier and simpler to use, and also faster.

3.  Stability and accuracy:

A. Condenser measuring microphone: SUNLIGHT measuring microphone Model-8120H and the microphone that used in Artificial Ear Model-142EA-S or Model-142EK-S are stable enough. After a long-term stability check, we have found that the stability of the microphones are within +/- 0.3 dB (within 3 to 5 years). This is one of the achievement of SUNLIGHT who has specialized in the field of electroacoustic measurement for more than 20 years. Most ordinary electret condenser microphones (ECM) may change 2 to 3 dB within one year.  (Model-142EK-S had ceased to produce)

B. Some other electroacoustic instruments often use the noise method to measure the frequency response and impedance etc. of a loudspeaker. This method is all right theoretically, but the test result is not stable enough. Relatively stable result can be obtained if the average of many repetitive measurements are taken. However, even done in this way , the instruments are still very afraid of the interference of environment noise . The other method, so called pulse FFT method, is much more sensitive to the environment noise, and its resolution, accuracy and stability are very poor (see Pages 19 and 20). SUNLIGHT Type1600 uses sine wave method with tracking filter, it is not sensitive to environment noise so that the test result is stable with high accuracy.

4.  When Type 1600S or 1600F is used to measure loudspeaker, the power output can be set to a value as high as 18 Vrms (40W, 8Ω). Internal protection circuit is installed so that long time short-circuit at the output terminals is permitted. This output power is much higher than other instruments unless the later are used with additional amplifier .