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I would like to ask for help regarding a certain phenomenon related to amplification by the Analog Devices AD620 instrumentation amplifier (device home page, device datasheet). Vcc is 5V.

The AD620 receives a differential voltage from the KMZ10B magnetoresistive sensor, which has a Wheatstone bridge construction.

MY GOAL:

I wanted to amplify voltage from KMZ10B (which is about several tens of millivolts). In my circuit this voltage depends on direction of the magnetic induction of the neodymium magnet. A direct voltage results gives such a characteristic: On the above graph:

• X-axis = Neodymium magnet angle (degrees)
• Y-axis = voltage (V)

Then I decided to implement the voltage reading from AD620.

HOW I DID THAT:

I used 4.7 kOhm resistor between +pin 1 and - input8. Datasheet of AD620 says that this resistance (called Rg) must be calculated like this:

Rg = 49.4 kOhm/(G-1)

G - gain

I used 4.7 kOhm resistor, so gain is 11.51. Reference voltage is about 2.5 V (from second op-amp: MCP6022) and voltage divider (half of 5V from Vcc)

I created a chart of this circuit (voltage measured between output of AD620 and GND) and it looks like below: Now I decided to compare signals before and after amplifying.

I took the results in Excel made before using AD620, I multiplied them with Gain (11.51) and added a 2.5 volt reference (below).

y=((x*11.51)+2.5)

It was supposed to show if the amplifier really strengthens as the calculations show. And look, I compared both charts: LEGEND FOR ABOVE GRAPH:

• Blue chart is a real, amplified signal
• Orange chart is a calculated signal.

PROBLEM:

It looks like something's going wrong and in my opinion it depends on in-amp AD620. The signal rise up quickly and falls slowly. What can it be caused by?

I would like to ask for help regarding a certain phenomenon related to amplification by the Analog Devices AD620 instrumentation amplifier (device home page, device datasheet). Vcc is 5V.

The AD620 receives a differential voltage from the KMZ10B magnetoresistive sensor, which has a Wheatstone bridge construction.

MY GOAL:

I wanted to amplify voltage from KMZ10B (which is about several tens of millivolts). In my circuit this voltage depends on direction of the magnetic induction of the neodymium magnet. A direct voltage results gives such a characteristic: On the above graph:

• X-axis = Neodymium magnet angle (degrees)
• Y-axis = voltage (V)

Then I decided to implement the voltage reading from AD620.

HOW I DID THAT:

I used 4.7 kOhm resistor between + and - input. Datasheet of AD620 says that this resistance (called Rg) must be calculated like this:

Rg = 49.4 kOhm/(G-1)

G - gain

I used 4.7 kOhm resistor, so gain is 11.51. Reference voltage is about 2.5 V (from second op-amp: MCP6022) and voltage divider (half of 5V from Vcc)

I created a chart of this circuit (voltage measured between output of AD620 and GND) and it looks like below: Now I decided to compare signals before and after amplifying.

I took the results in Excel made before using AD620, I multiplied them with Gain (11.51) and added a 2.5 volt reference (below).

y=((x*11.51)+2.5)

It was supposed to show if the amplifier really strengthens as the calculations show. And look, I compared both charts: LEGEND FOR ABOVE GRAPH:

• Blue chart is a real, amplified signal
• Orange chart is a calculated signal.

PROBLEM:

It looks like something's going wrong and in my opinion it depends on in-amp AD620. The signal rise up quickly and falls slowly. What can it be caused by?

I would like to ask for help regarding a certain phenomenon related to amplification by the Analog Devices AD620 instrumentation amplifier (device home page, device datasheet). Vcc is 5V.

The AD620 receives a differential voltage from the KMZ10B magnetoresistive sensor, which has a Wheatstone bridge construction.

MY GOAL:

I wanted to amplify voltage from KMZ10B (which is about several tens of millivolts). In my circuit this voltage depends on direction of the magnetic induction of the neodymium magnet. A direct voltage results gives such a characteristic: On the above graph:

• X-axis = Neodymium magnet angle (degrees)
• Y-axis = voltage (V)

Then I decided to implement the voltage reading from AD620.

HOW I DID THAT:

I used 4.7 kOhm resistor between pin 1 and 8. Datasheet of AD620 says that this resistance (called Rg) must be calculated like this:

Rg = 49.4 kOhm/(G-1)

G - gain

I used 4.7 kOhm resistor, so gain is 11.51. Reference voltage is about 2.5 V (from second op-amp: MCP6022) and voltage divider (half of 5V from Vcc)

I created a chart of this circuit (voltage measured between output of AD620 and GND) and it looks like below: Now I decided to compare signals before and after amplifying.

I took the results in Excel made before using AD620, I multiplied them with Gain (11.51) and added a 2.5 volt reference (below).

y=((x*11.51)+2.5)

It was supposed to show if the amplifier really strengthens as the calculations show. And look, I compared both charts: LEGEND FOR ABOVE GRAPH:

• Blue chart is a real, amplified signal
• Orange chart is a calculated signal.

PROBLEM:

It looks like something's going wrong and in my opinion it depends on in-amp AD620. The signal rise up quickly and falls slowly. What can it be caused by?

6 Added datasheet links. Emboldened section headings. Standardised on terminology of "instrumentation amplifier" as used by AD620 manufacturer. Converted to usingSI standard decimal of "period" not "comma" (used in some countries) as some readers get confused, from previous experience.

# AD620 op ampinstrumentation amplifier with Wheatstone Bridge-based KMZ10B sensor

I would like to consult onask for help regarding a certain phenomenon related to amplification by the instrumental operational amplifierAnalog Devices AD620 instrumentation amplifier (device home page, device datasheet).  Vcc is 5V. The

The AD620 receives a differential voltage from the KMZ10B magnetoresistive sensorKMZ10B magnetoresistive sensor, which has a Wheatstone bridge construction.

MY GOALMY GOAL: -

I wanted to amplify voltage from KMZ10B (which is about several tens of millivolts). In my circuit this voltage depends on direction of the magnetic induction of the neodymium magnet. A direct voltage results gives such a characteristic: Neodymium magnet angle (degrees) is in x and voltage (V) is in y.On the above graph:

• X-axis = Neodymium magnet angle (degrees)
• Y-axis = voltage (V)

Then I decided to implement the voltage reading from AD620.

HOW I DID THATHOW I DID THAT:

I used 4,.7 kOhm resistor between + and - input. Datasheet of AD620 says that this resistance (called Rg) must be calculated like this:

Rg = 49,.4 kOhm/(G-1)

G - gain

I used 4,.7 kOhm resistor, so gain is 11,.51. Reference voltage is about 2,.5 V (from second op-amp: MCP6022) and voltage divider (5Vhalf of 5V from Vcc on half)

I createcreated a chart of this circuit (voltage measured between output of AD620 and GND) and it looks like below: Now I decided to compare signals before and after amplifying. I

I took the results in Excel made before using AD620, I multiplied them with Gain (11.51) and added a 2.5 volt reference (below).

y=((x*11,.51)+2.5)

It was supposed to show if the amplifier really strengthens as the calculations show. And look, I compared both charts: LEGENDLEGEND FOR ABOVE GRAPH: - Blue chart is a real, amplified signal - Orange chart is a calculated signal.

• Blue chart is a real, amplified signal
• Orange chart is a calculated signal.

TROUBLEPROBLEM:

It looks like something's going wrong and in my opinion it depends on opin-amp AD620. The signal rise up quickly and falls slowly. What can it result frombe caused by?

# AD620 op amp with Wheatstone Bridge-based KMZ10B sensor

I would like to consult on a certain phenomenon related to amplification by the instrumental operational amplifier AD620. Vcc is 5V. The AD620 receives a differential voltage from the KMZ10B magnetoresistive sensor, which has a Wheatstone bridge construction.

MY GOAL: - I wanted to amplify voltage from KMZ10B (which is about several tens of millivolts). In my circuit this voltage depends on direction of the magnetic induction of the neodymium magnet. A direct voltage results gives such a characteristic: Neodymium magnet angle (degrees) is in x and voltage (V) is in y.

Then I decided to implement the voltage reading from AD620.

HOW I DID THAT:

I used 4,7 kOhm resistor between + and - input. Datasheet of AD620 says that this resistance (called Rg) must be calculated like this:

Rg = 49,4 kOhm/(G-1)

G - gain

I used 4,7 kOhm resistor, so gain is 11,51. Reference voltage is about 2,5 V (from second op-amp: MCP6022) and voltage divider (5V of Vcc on half)

I create a chart of this circuit (voltage measured between output of AD620 and GND) and it looks like below: Now I decided to compare signals before and after amplifying. I took the results in Excel made before using AD620, I multiplied them with Gain (11.51) and added a 2.5 volt reference (below).

y=((x*11,51)+2.5)

It was supposed to show if the amplifier really strengthens as the calculations show. And look, I compared both charts: LEGEND: - Blue chart is a real, amplified signal - Orange chart is a calculated signal.

TROUBLE: It looks like something's going wrong and in my opinion it depends on op-amp AD620. The signal rise up quickly and falls slowly. What can it result from?

# AD620 instrumentation amplifier with Wheatstone Bridge-based KMZ10B sensor

I would like to ask for help regarding a certain phenomenon related to amplification by the Analog Devices AD620 instrumentation amplifier (device home page, device datasheet). Vcc is 5V.

The AD620 receives a differential voltage from the KMZ10B magnetoresistive sensor, which has a Wheatstone bridge construction.

MY GOAL:

I wanted to amplify voltage from KMZ10B (which is about several tens of millivolts). In my circuit this voltage depends on direction of the magnetic induction of the neodymium magnet. A direct voltage results gives such a characteristic: On the above graph:

• X-axis = Neodymium magnet angle (degrees)
• Y-axis = voltage (V)

Then I decided to implement the voltage reading from AD620.

HOW I DID THAT:

I used 4.7 kOhm resistor between + and - input. Datasheet of AD620 says that this resistance (called Rg) must be calculated like this:

Rg = 49.4 kOhm/(G-1)

G - gain

I used 4.7 kOhm resistor, so gain is 11.51. Reference voltage is about 2.5 V (from second op-amp: MCP6022) and voltage divider (half of 5V from Vcc)

I created a chart of this circuit (voltage measured between output of AD620 and GND) and it looks like below: Now I decided to compare signals before and after amplifying.

I took the results in Excel made before using AD620, I multiplied them with Gain (11.51) and added a 2.5 volt reference (below).

y=((x*11.51)+2.5)

It was supposed to show if the amplifier really strengthens as the calculations show. And look, I compared both charts: LEGEND FOR ABOVE GRAPH:

• Blue chart is a real, amplified signal
• Orange chart is a calculated signal.

PROBLEM:

It looks like something's going wrong and in my opinion it depends on in-amp AD620. The signal rise up quickly and falls slowly. What can it be caused by?

5 deleted 60 characters in body

I would like to consult on a certain phenomenon related to amplification by the instrumental operational amplifier AD620. Vcc is 5V. The AD620 receives a differential voltage from the KMZ10B magnetoresistive sensor, which has a Wheatstone bridge construction.

MY GOAL: - I wanted to amplify voltage from KMZ10B (which is about several tens of millivolts). In my circuit this voltage depends on direction of the magnetic induction of the neodymium magnet. A direct voltage results gives such a characteristic: Neodymium magnet angle (degrees) is in x and voltage (V) is in y.

Then I decided to implement the voltage reading from AD620.

HOW I DID THAT:

I used 4,7 kOhm resistor between + and - input. Datasheet of AD620 says that this resistance (called Rg) must be calculated like this:

Rg = 49,4 kOhm/(G-1)

G - gain

I used 4,7 kOhm resistor, so gain is 11,51. Reference voltage is about 2,5 V (from second op-amp: MCP6022) and voltage divider (5V of Vcc on half)

I create a chart of this circuit (voltage measured between output of AD620 and GND) and it looks like below: Now I decided to compare signals before and after amplifying. I took the results in Excel made before using AD620, I multiplied them with Gain (11.51) and added a 2.5 volt reference (below).

y=((x*11,51)+2.5)

It was supposed to show if the amplifier really strengthens as the calculations show. And look, I compared both charts: LEGEND: - Blue chart is a real, amplified signal - Orange chart is a calculated signal.

TROUBLE: It looks like something's going wrong and in my opinion it depends on op-amp AD620. The signal rise up quickly and falls slowly. What can it result from?

Regards and I will be grateful for your comments. chris

I would like to consult on a certain phenomenon related to amplification by the instrumental operational amplifier AD620. Vcc is 5V. The AD620 receives a differential voltage from the KMZ10B magnetoresistive sensor, which has a Wheatstone bridge construction.

MY GOAL: - I wanted to amplify voltage from KMZ10B (which is about several tens of millivolts). In my circuit this voltage depends on direction of the magnetic induction of the neodymium magnet. A direct voltage results gives such a characteristic: Neodymium magnet angle (degrees) is in x and voltage (V) is in y.

Then I decided to implement the voltage reading from AD620.

HOW I DID THAT:

I used 4,7 kOhm resistor between + and - input. Datasheet of AD620 says that this resistance (called Rg) must be calculated like this:

Rg = 49,4 kOhm/(G-1)

G - gain

I used 4,7 kOhm resistor, so gain is 11,51. Reference voltage is about 2,5 V (from second op-amp: MCP6022) and voltage divider (5V of Vcc on half)

I create a chart of this circuit (voltage measured between output of AD620 and GND) and it looks like below: Now I decided to compare signals before and after amplifying. I took the results in Excel made before using AD620, I multiplied them with Gain (11.51) and added a 2.5 volt reference (below).

y=((x*11,51)+2.5)

It was supposed to show if the amplifier really strengthens as the calculations show. And look, I compared both charts: LEGEND: - Blue chart is a real, amplified signal - Orange chart is a calculated signal.

TROUBLE: It looks like something's going wrong and in my opinion it depends on op-amp AD620. The signal rise up quickly and falls slowly. What can it result from?

Regards and I will be grateful for your comments. chris

I would like to consult on a certain phenomenon related to amplification by the instrumental operational amplifier AD620. Vcc is 5V. The AD620 receives a differential voltage from the KMZ10B magnetoresistive sensor, which has a Wheatstone bridge construction.

MY GOAL: - I wanted to amplify voltage from KMZ10B (which is about several tens of millivolts). In my circuit this voltage depends on direction of the magnetic induction of the neodymium magnet. A direct voltage results gives such a characteristic: Neodymium magnet angle (degrees) is in x and voltage (V) is in y.

Then I decided to implement the voltage reading from AD620.

HOW I DID THAT:

I used 4,7 kOhm resistor between + and - input. Datasheet of AD620 says that this resistance (called Rg) must be calculated like this:

Rg = 49,4 kOhm/(G-1)

G - gain

I used 4,7 kOhm resistor, so gain is 11,51. Reference voltage is about 2,5 V (from second op-amp: MCP6022) and voltage divider (5V of Vcc on half)

I create a chart of this circuit (voltage measured between output of AD620 and GND) and it looks like below: Now I decided to compare signals before and after amplifying. I took the results in Excel made before using AD620, I multiplied them with Gain (11.51) and added a 2.5 volt reference (below).

y=((x*11,51)+2.5)

It was supposed to show if the amplifier really strengthens as the calculations show. And look, I compared both charts: LEGEND: - Blue chart is a real, amplified signal - Orange chart is a calculated signal.

TROUBLE: It looks like something's going wrong and in my opinion it depends on op-amp AD620. The signal rise up quickly and falls slowly. What can it result from?

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