iuniversal measuring amplifier

um. devices. In this case, potentiometer P2 can be used to set the trigger level. Finally, it is also possible to use the circuit as a preamplifier for an inexpensive oscilloscope. lication for the circuit, Regardless of the actual app the only main calibration is the same in all cases. This is the "zero offset" and is adjusted by means of preset potentiometer 131. This potentiometer must be set so that when the inputs are shorted (in other words, when the left-hand sides of R1 and R2 are connected together) the output from the opamp is exactly zero volts. In normal applications, potentio- meter P2 adjusts the input sensitivity. With the aid djust the of this potentiometer, it is possible tot gain of the circuit over a wide range; from a gain of 2 to a gain of 130. It may therefore be useful to provide this potentiometer with a calibrated scale. 15V universal measuring amplifier An analogue multimeter is, by now, one of the more "standard" items of equipment owned by electronics a...