Charge Amplifiers

Charge amplifiers convert the charge output by a piezoelectric Sensor into a prop or tional voltage, which is used as an input variable for analysis systems, and can be digitized in an analog–to–digital (A/D) converter if necessary. A charge amplifier basically consists of an inverting voltage amplifier with a high open–loop gain and capacitive negative feedback. It relies on a metal oxide semiconduct or field effect transist or (MOSFET) or a junction field effect transist or (JFET) at its input to achieve high insulation resistance and minimize leakage current. If the open–loop gain is sufficiently high, the cable and Sensor capacitance can be neglected, leaving the output voltage dependent on just the charge at the charge amplifier input and the range capacitor.

6.1  Charge Amplifiers

Charge amplifiers convert the charge output by a piezoelectric Sensor into a prop or tional voltage, which is used as an input variable for analysis systems, and can be digitized in an analog–to–digital (A/D) converter if necessary. A charge amplifier basically consists of an inverting voltage amplifier with a high open–loop gain and capacitive negative feedback. It relies on a metal oxide semiconduct or field effect transist or (MOSFET) or a junction field effect transist or (JFET) at its input to achieve high insulation resistance and minimize leakage current. If the open–loop gain is sufficiently high, the cable and Sensor capacitance can be neglected, leaving the output voltage dependent on just the charge at the charge amplifier input and the range capacitor.
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Model:YMC

8101

8102

8102 A/T

8103

Input Range

±5104pC

Voltage/IEPE:±10V

Charge:±106pC

Voltage:±10V ;

Charge:±106pC

±105pC

Sensitivity Uniformization

1 – 9.99

(Adjustable)

0.100~999

1.00~1099

1.00~10.99

Gain

mV/pC

1 – 100(Constant)

0.01,0.1,1,

10,100,1000

0.01,0.1,1,

10,100,1000

1,3,10,30,100

300,1000

High–pass Filters

Hz

1(Constant)

A:0.3,1,310,30,100

V:1 ,3,10,30,100

D:1 ,3,10,30,100

0.3,1,3,10,30,100

0.3 (Fixed)

Low–pass Filters

kHz

≤100(Constant)

0.3,1,3,10,30,100

0.3,1,3,10,30,100

0.3,1,3,10,30,100

Accuracy

%

±1

A: ±1; V:±3 ;D:±3

±1

±1

Noise

μV

≤10

≤5

≤5

≤5

Output Range

V

±5

±10

±10

±10

Power Supply


DC:±14V – ±18V

220V50Hz0.1A

 or 110V60Hz0.2A

220V50Hz0.1A

 or  DC±18V–±27V

220V50Hz0.3A

 or DC±18V

Operating Temperature

–10 +50

–10 +50

–10 +50

–10 +50

Weight

kg

0. 2

1.3

1.5

5.0(6 chs)

Size

mm

80×50×24

45×122×200

70×132×200

236×132.5×300

(6     chs)


Impact Hammers Modal Hammers