Signal conditioning modules

TFxxxxN Series

2015.04.29-A/3

Page 4 of 5

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Function

Zero adjustment function by setting up adjustment resistor at the zero point can change the zero signal transmission, which makes the

output signal overall migration. Full adjustment function is also called the gain adjustment function, and it can change the ratio of signal

transmission through the set up corresponding adjust resistance at the full adjustment, and the isolation transmission proportion of input and

output signal value would be changed.

Usage

Adding and reducing negative zero resistance can reduce the zero of signal output. Adding and reducing positive zero resistance can

increase the zero of signal output. Adding and reducing negative full adjustable resistance can reduce the ratio of signal transmission,

Adding and reducing negative full adjustable resistance can increase the ratio of signal transmission. You can use potentiometer to adjust

the output signal of zero and full in practical application. As shown in the figure 3, the terminal of full or zero adjustment is connected to the

sliding of potentiometer, and the both ends of potentiometer is to the zero or full reference of positive and negative regulating reference .

Sliding potentiometer to adjust signal full or changing the ratio of rise and fall can also adjust zero and full of the output signal.

As shown in the figure 3, Adjusting the potentiometer to positive can increase zero or full of the corresponding signal. Adjusting the

potentiometer to negative can reduce zero or full of the corresponding signal. The maximum recommended range of potentiometer is

10KΩ~1MΩ, detail resistance selection according to the adjustment accuracy. Choose larger resistance potentiometer for high precision

fine-tuning. Choose smaller resistance potentiometer for a wide range of rough adjustment.

Notice

Using the function of zero and full adjustment will affect original accuracy. Due to the effect on temperature drift of external

adjustment resistor and the stability of the potentiometer, temperature drift of product will be changed, too. For the zero and full adjustment

potentiometer, the ratio between positive resistance and negative resistance, which makes the zero point of different products

predetermined Zero point is diverse. Please set the value of potentiometer according to actual situation.

2. Recommended EMC circuit

Signal output

C1

10 +

D1

11 -

18 +

D2

17 -

C2

1+

2-

D3

R1

R2

16

15

Isolation power output

D4

R3

R4

9+

8-

7

6

Signal input

Power supply

+

+

Fig. 4

Components

Recommended parameters

C1

100uF/35V

C2

4.7uF/35V

R1

Negative zero adjustment resistance

R2

Positive zero adjustment resistance

R3

Negative gain adjustment resistance

R4

Positive gain adjustment resistance

D1

SMCJ28A

D2

SMCJ30A

D3

SMBJ15A

D4

SMBJ15A