1. Overview

KM1804For single machine4通道IEPEsignalRegulator, capable of bothIEPESensors provide the necessary excitation power for normal operation, while alsoIEPEThe signal output by the sensor is amplified, filtered, and processed.

Main Features

Ø The incentive power supply is adjustable in multiple levels to meet different needsIEPERequirements for sensor and cable length;

Ø Can turn off the excitation current, as4Use of channel voltage amplifier;

Ø Gain adjustable in multiple levels, providing different amplification factors to improve signal-to-noise ratio;

Ø The low-pass filter is adjustable in multiple levels, and different cutoff frequencies can be set according to the testing situation;

Ø highlightOLEDDisplay, show all setting parameters;

Ø All channel settings parameters are saved in case of power failure;

Ø Small size, light weight, multi-channel structure.

2. technical indicators

2.1. Number of channels:4通道

2.2. IEPEConstant current output:OFFThe4mAThe10mAThe20mA

2.3. Constant current output accuracy:<±1%

2.4. Constant current excitation voltage:+20VDC～+24VDC

2.5. gain×1、×10、×100mV/mV

2.6. Frequency range:0.3Hz～100kHz

2.7. Low pass filter:300HzThe1kHzThe3kHzThe10kHzThe30kHzThe100 kHz（-3dB±1dB） Attenuation rate: approximately-12dB/oct

2.8. Accuracy: ＜±0.5%

2.9. Noise: ＜0.1mVrms

2.10. Maximum output:±8Vp

2.11. Overload indication:Output greater than|1±8Vp|time,LEDbright

2.12. Input and output methods:BNC

2.13. Operating Temperature0～50℃

2.14. Power supply method:AC220V±10% 50～60Hz

2.15. Overall dimensions:200mm×122mm×45mm

2.16. Weight: Approximately1.2Kg

3. working principle

KM1804This isIEPEThe sensor provides the necessary working power for normal operation, while alsoIEPEThe signal output by the sensor is amplified, filtered, and processed. The instrument mainly consists of the following parts:

3.1. Power supply section: The external input AC power supply is transformed, rectified, and stabilized to provide the DC power required for the normal operation of the entire instrument;

3.2. Control section: Provides display and button processing for the overall operation of the machine, as well as selection and control of current, gain, and filter;

3.3. Constant current source section: forIEPEThe sensor provides the current required for normal operation. Directly provided to through input lineIEPESensors. Different constant current source current sizes can be set according to actual needs. When the current level is set toOFFWhen there is no current output, the input terminal can be directly connected to the voltage signal, and the instrument can be used as a voltage amplifier;

3.4. Enlarge section:Select by gain,Process the input signal1Double10Double or100Magnification processing;

3.5. Low pass filtering part: Filter the signal to remove useless high-frequency signals. The low-pass filter of this instrument is a second-order Butterworth low-pass filter with a cut-off frequency-3dBThe attenuation rate is about-12dB/OCT；

3.6. Overload indicator section: The overload indicator monitors the overload condition of the output amplifier and consists of a voltage comparator and a light-emitting diode. The threshold voltage is approximately±8Vp.

4. Instructions for use

4.1. KM1804Front and rear panel schematic diagram

4.1.1. The front panel consists of four parts: display screen, parameter setting knob, input terminal, and overload indicator light

4.1.1.1. Display screen: displays the current, gain, and filter level of the current channel;

4.1.1.2. Parameter setting knob: adjust the current, gain, and filter settings of each channel;

4.1.1.3. Input end:4aBNCCorresponding channels respectively1—4The input signal. The input end can be directly connectedIEPESensors. This machine adopts2Line system,IEPEThe power supply current and signal output of the sensor share one output cable;

4.1.1.4. Overload indicator light: Normal testing can only be carried out when the signal is not overloaded.

4.1.2. The rear panel consists of three parts: signal output terminal, power switch, and power socket

4.1.2.1. Signal output terminal:4aBNCCorresponding channels respectively1—4The output signal;

4.1.2.2. Power switch: controls the power on/off of the entire instrument;

4.1.2.3. Power socket: for external AC connection220V 50HZThe communication power socket.

4.2. Operation and usage instructions

4.2.1. Pre startup inspection: Ensure reliable connection of input, output, power, and other cables;

4.2.2. Power on: Turn on the power switch, and the instrument will automatically restore the parameters set before the last shutdown and make the necessary settings. The entire machine will enter normal working mode. At this point, the corresponding parameters can be reset and adjusted;

4.2.3. Display screen interface: The following figure showsCH1The current parameters

Figure 1: Display Screen Interface

CH1-IsThe constant current source current value can be selectedOFFThe4mAThe10 mAThe20mAThe size of the constant current source needs to be selected according to the requirements of the external sensor. choiceOFFWhen the instrument does not provide a constant current source, it can be used as a voltage amplifier;

CH1-GAINMagnification factor, selectable1Double10Double100On the premise of not overloading the signal output, try to choose a larger amplification factor to improve the signal-to-noise ratio;

CH1-LPFLow pass filter cut-off frequency, selectable300HzThe1kHzThe3kHzThe10kHzThe30 kHzThe100 kHzSelect based on the frequency of the input signal,Filter useless high-frequency signals；

Channel selection: press Knob, You can choose the channel that needs to be set or displayed, and the channel number will switch cyclicallyCH1-CH2-CH3-CH4At the same time, display the current setting parameters of the corresponding channel, as shown in Figure 1CH1；

Select the parameters to be set: Left or Right RotationThe knob and arrow will move up and down, indicating the parameters that need to be set. In Figure 1, the parameter that needs to be set is the constant current source current value;

setParameter setting: Left or right rotationThe knob allows you to select the gear of the current setting parameter. In Figure 1, the constant current source current value can be set through this knob.

5. Attachment

5.1. Instruction Manual 1this

5.2. Certificate of Conformity 1copy

5.3. Input line (one end of low-noise cable)M5One headBNC）4root

5.4. Output line (double headed)BNCCable) 4root

5.5. power cord 1root