Measurement

AC bridge type strain Amplifier

SA-250
SA-250
|Main features|Main specifications|
SA-250 is a AC bridge type strain amplifier which is for strain gauge, strain gauge type transducer.
It has 20,000 times gain (max.) and DC to 3 kHz band-width. Also its dorift is very low.
Strain calibration value can be set using 4 digits digital switch.
Main features
4 digits digital switch for sensitivity value setting.
Sensitivity value can be set using 4 digits digital switch very easily.
4 digits digital switch for calibration reference signal value setting
Calibration reference signal value can be set 1×10-6 step using 4 digits digital switch very precisely.
Output setting method is choosing output range type
Output range can be set by choosing output range (1V,2V,5V)
Digital/Analog monitor available
Monitor meter shows 3 digits numeric value(±999). So it's very easy to monitor.
DC cut switch for harsh environment measurement
DC level can be cut using DC cut switch.
If the temperature changing is big, AC signal can be measured using DC cut switch.
Both AC/DC power available
Both AC/DC power available. (AC 85 to 132V / 47 to 440 Hz, DC 10 to 15V)
Main specifications
Input connector ±10000×10-6 Strain
Sensitivity Input 100×10-6Voltage output (Strain)
Maximum.2V (Gauge rate:2.00,B.V2VAC)
Sensitivity Setting 0 to 9999×10-6 Strain
Setting accuracy: < ±0.5%F.S.±10mV
Calibration signal 0 to 9999×10-6 Strain
Setting accuracy:±1×10- 6 Strain < ±10mV
(super imposed to input signal)
Applicable gauge 20ohms to 1kohms
Gauge rate:Fixed 2.00
Balance Method   By electonic auto balance + manual
(Fine zero) Balance
Adjustable registor range Approx. ±10000×10-6 Strain (Max.)
Adjustable registor capacity Approx. 2000pF (Auto. Max.)
Accuracy registor range < ±1×10-6 Strain±20mV
Fine zero range 1V:±150mV,2V:±300mV,5V:±750mV　(output range)
Zero drift 0: < ±0.1×10-6 Strain/ºC
Gain drift < ±0.025%/ºC
Noise
LPF S/N
PASS (DC to 3kHz) 46dB
Max. output OUTPUT1 ±5V/20mA Load 5kohms
OUTPUT2 ±5V/20mA Load 5kohms
Nonlinearity voltage < ±0.1%/F.S.
Excitation AC 0.5,2V (Approx. 10kHz)
Maximum Current: Approx. 30mA
Output range 3range 1V/2V/5V
By slide switch
Adjuster Variable 1 to Approx. 1/3
Frequency response DC to 3kHz
+0/-3dB
Low pass filter Cutoff frequency 10Hz/30Hz/100Hz/300Hz/1kHz
PASS (3kHz)
Cutoff curve -24dB/oct.
DC Cut Cutoff frequency 0.5Hz（-3dB）
Cutoff curve -12dB/oct.
Monitor meter Digital Display ±999
Total accuracy < ±1digit ±0.4%
Display mode DCmean、ACpk+DC Absolute value
Display Output range setting
at 1V: 1.00
at 2V: 2.00
at 5V: 5.00
Memory backup > 30days
Environment Temperature -10 to 50ºC
Humidity 0% to 85%RH(non-condensing)
Power supply AC85V to 132V/47Hz to 440Hz Approx. 15VA
DC10V to 15V　Approx. 1A
Insulation withstand pressure AC1000V 1minute(AC power supply and a housing interval)
Insulation > 50Mohms
Dimensions(W×H×D) Approx. 49.5mm×138mm×310mm(excluding tang)
Weight Approx. 1.5kg
Figure of dimensions(mm)
Figure of dimensions SA-250
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