CET7701B6CH charge amplifier is a 6-channel charge amplifier whose output voltage is proportional to the input
charge. Equipped with piezoelectric sensors, can measure the acceleration, pressure, force and other mechanical quantities of
objects, widely used in water conservancy, power, mining,
transportation, construction, earthquake, aerospace, weapons and
other sectors. This instrument has the following characteristics:
The main components with reasonable structure are high import
precision, low noise and small drift, so the quality is stable and
reliable.
Eliminate the attenuation of the equivalent capacitance of the
input cable to the signal, can connect to the cable without
affecting the measuring accuracy;
For a dynamic weighing system, the charge amplifier adapts to the
vehicle's speed range of 0. 5-100 km/h.
Charge amplifier front panel
Charge amplifier right view
Dimensions for CET7701B-6CH charge amplifier
Technical Parameters
Input characteristics: maximum input charge ±130000Pc; Sensitivity:
0.05mV / Pc;
Frequency response:
(a) Upper frequency: 100kHz (- 3dB ±1dB);
(b) Lower limit frequency: 10Hz (- 3dB ±1dB);
Output properties:
(a) Maximum output amplitude: +6.5 VPP;
(b) Max output current: table +50 mA;
(c) Output resistance: less than 10 ohms;
(d) Distortion: less than 0.5%;
Noise: less than 1 mV;
Working power supply: 24VDC + 20%, ≤35mA;
Level of protection: IP65 (panel);
Accuracy: less than 1% (under rated working conditions, ±6.5 VPP,
160Hz sine signal measurement);
Working temperature:-40 ℃ ~ 80 ℃;
Number of channels: 6;
Use Methods
1. The charge amplifier input impedance is
extremely high, in order to protect the body or the external
induced voltage breakdown of the input amplifier, when connecting
the sensor to the charge amplifier input, removing the sensor, or
suspecting loose connector, checking tightening, the power supply
must be turned off.
2. Although the equipment can match the
extension cable, the long cable will introduce noise, such as the
inherent noise, mechanical movement and induced AC noise of the
cable. Therefore, when on-site measurement, the low-noise cable
shall be adopted and shall be fixed as short as possible, and be
far from the large power equipment of the power line.
3. Welding and assembly of connectors to
sensors, cables and charge amplifiers are highly professional and
should be repaired by specialized technicians. After welding, apply
rosin anhydrous ethanol solution (welding oil prohibited), apply
medical cotton ball to clean flux with anhydrous alcohol (medical
alcohol prohibited), and dry. The connector should be kept clean
and dry, and the shield cap should be screwed when it is not in
use.
4. In order to ensure the accuracy of the
instrument, the measurement should be preheated for 15 minutes. If
humidity exceeds 80%, preheating time should be more than 30
minutes.
Wiring Instruction
| No. | Interface type | Pin type | Definition rules |
|---|
| 1 | Output | 9 Pin D type | Pin1----The first channel signal output;
Pin2----The second channel signal output;
Pin3----The third channel signal output;
Pin4----The forth channel signal output;
Pin5----The fifth channel signal output;
Pin6----The sixth channel signal output;
7, 8, 9----Output signal reference ground |
| 2 | Input | BNC socket | Each BNC socket corresponds to the input channel; |
| 3 | Input | Power input | Pin1-power supply positive 24VDC input, red power cord;
Pin2-power supply negative input, black power cord; |
Charge Amplifier signal output, power connection diagram
Charge Amplifier signal input wiring diagram
