Brief introduction: CHI400B series time-resolved electrochemical quartz crystal micro balances (EQCM) is a product of our company cooperate with wuhan university (patent), wuhan university. Quartz crystal micro balances (QCM design) can be extremely sensitive quality measurement. Technical parameters: Electrochemical quartz crystal micro balances CHI400B series containing quartz crystal oscillator, frequency counter, fast digital signal generator, high resolution high speed data acquisition system, voltage current signal filter, the signal gain and iR drop compensation circuit, and the potentiostat/constant current meter (440 a). Potential range of plus or minus 10 v, current range is + 250 ma. Current measurement threshold below 50 pa. Quartz crystal micro balances and the potentiostat/constant current meter integration makes EQCM measurement is very easy and convenient. CHI400B USES the way of the time-resolved measurements of frequency change. The traditional way is to adopt the method of frequency counts directly, to get the QCM design 1 hz resolution, sampling time need 1 second. To 0.1 Hz QCM design resolution, sampling time of 10 seconds. We will be the frequency of the QCM design and a standard frequency measurement, the difference of cycle thus greatly shorten the sampling time, improve the time resolution. We can be obtained in the millisecond time 1 Hz or 0.1 Hz or better frequency resolution. When combined with cyclic voltammetry, permissible under the scanning speed of 0.5 V/s signal to obtain the QCM design. The need a fast measurement (such as dynamic measurement) is particularly important. Electrochemical experimental techniques that allow the combination of CV and QCM include, LSV, CA, I-T, and CP. CHI400B series is also a very fast instrument. The update rate of the signal generator is 1MHz, and the data acquisition rate is 200KHz. The scanning speed of the cyclic voltammetry method was 100V/s, and the potential increment was only 0.1mV. And as the frequency of the AC voltammetry can be up to 10KHz. The instrument can work in the way of two, three, or four electrodes. The four electrode is very important for the high current or low impedance electrolytic cell (for example), which can eliminate the measurement error caused by the cable and the contact resistance. Because the instrument integrates a variety of commonly used electrochemical measurement technology, the instrument can be used as a general electrochemical measurement, also can be used as a quartz crystal micro balance measurement (not simultaneously electrochemical measurement).
