This is within the voltage output drive capability The expected peak op amp output is about 3.3V for the 300 mV input level. The device under test (DUT) is configured as a standard non-inverting voltage amplifier with a signal gain of 11 with Without an oscilloscope but with a typical digital multimeter which usually has AC voltage frequency response up to a few kHz. At a lower frequency, the test circuit can be used The components of the oscillator can be easily changed for frequencies from hundreds of Hz to about 500 kHz.įor example, to operate at 1 kHz, substitute Rw = 1.5 kohm and Cw = 0.1 uF. This is useful during offset voltage monitoring as it eliminatesĪny oscillator background coupled noise on the protoboard. Switch Sw1 is added to disable the Wien-bridge oscillator. The Radj pot is used toĪdjust the oscillator output level to about 300 mV before buffering with the second amplifier in the dual. The oscillator uses a dual LM4562 op amp with a GBW of 50 MHz and a slew rate of 20 V/us.
The circuit uses a classic low distortion Wien-bridge oscillator configured to run at 22 kHz. The circuit has been found useful for checking
#Op amp offset measurement portable#
The test circuit can be powered by a portable dual 6V DC battery supply. Component values facilitate checking offset voltage and bias current values. The design uses a non-inverting op amp circuit configuration suitable forīasic test purposes. The circuit includes a 22 kHz Wien-bridge This article presents a simple implementation of a compact convenient portable test circuit which can be used withĪ low bandwidth oscilloscope to quickly check any standard voltage feedback op amp with standard pin outs.
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