The simple exciter,t designed in conjunction with Robert F. Wilson, is a device for excitation of the nervous system. It combines ease of operation and portability. Power is derived from the 1 10volt A.C. power mains, and the output of the machine is 60-cyde sinusoidal. A switch provides for momentary or continuous excitation. A variac control unit is used to obtain smooth adjustment of voltage...

A semi-automatic method for the routine evaluation of fibrinolytic activity is described. The principle is based upon graphic recording by a multichannel voltmeter of tension drops over a potentiometer, caused by variations in the influence of light upon a light-dependent resistance, resulting from modifications in the composition of the fibrin fibres by lysis. The method is applied to the asse...

This circuit is probed by two voltmeters as sketched in the righthand figure above. Each voltmeter consists of a resistor R R1, R2 and an ammeter that measures the currents Ii and reports the “voltage” Vmeter,i = IiR. 3 The “positive” leads of the voltmeters are connected to points a and c, such that the directions of currents I1 and I2 are as shown when positive. The paradox is that Vmeter1 do...

--Timebase distortions cause nonlinear distortions of the sampled waveforms by equivalent-time sampling instruments. A new model of quantizer is proposed to be used when a large part of timebase distortions is the result of non-random quantization error that is known. A compensation method based on this model is applied to timebase quantization. The simulated results show that the proposed comp...

Two ordinary green light-emitting diodes used as light emitter and detector coupled with simple voltmeter form a complete, cost-effective prototype of a photometric hemoglobinometer. The device has been optimized for cuvette assays of total hemoglobin (Hb) in diluted blood using three different chemical methods recommended for the needs of clinical analysis (namely Drabkin, lauryl sulfate, and ...

Modern instruments use sensors, analogue and digital electronics, processing to measure almost any kind of physical quantities. Arduino is a very useful widely used platform build such systems in school environment. Since it has voltage inputs, can be as voltmeter or even chart recorder. However, the ways ensuring required level accuracy just right estimation are often unknown misunderstood. In...

This article proposes a method for reducing the loading effects when DC voltage or current is measured in linear circuit with digital multimeter (DMM). In proposed method, voltmeter placed series to estimate current, and ammeter parallel voltage, which opposite of conventional approach. Its application particularly interest equivalent resistance between nodes (current) under measurement high (l...