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DC amplifier

Product Outline

High-accuracy DC amplifier with high-pass and low-pass filter.

  • 7-segment LED display with 8mm character height
  • High-accuracy DC amplifier with high-pass and low-pass filter
  • High gain (max. gain: 10000 times) at DC to 20kHz band
  • Equipped with easy-to-use strain gage simulator function for calibration
  • Zero drift: within ±0.3μV/℃
  • Auto zero function


Input resistance range 60Ω to 2kΩ
Excitation voltage DC2.5, 5, 10, 15V±0.3%
Output current: within 50mA
Zero adjustment range ±1.5mV/V
10 turn potentiometer dial knob
Gain adjustment range Coarse adjustment: 0, 1/50, 1/20, 1/10, 1/5, 1/2,1/1 Error±0.2%
Fine adjustment: 1 to 1/6 of each range variable
Input voltage range 0 to ±100mV
Input resistance 10MΩ or more (balanced differential direct-connect type)
Voltage amplification Max. 10000 times
Zero drift (at gain max.) Within ±0.3μV/℃ RTI (after a lapse of 30 min. after power ON)
Gain drift Within 0.01%/℃ (after a lapse of 30 min. after power ON)
Noise (at gain max.) Within 20μVp-p RTI (full band)
Within 6μVp-p RTI (1kHz band)
Within 0.8μVp-p RTI (10Hz band)
Non-linearity Within ±0.01%/FS
Output signal Voltage output: 0 to ±10V ±5mA
Output resistance: 0.2Ω (BNC connector output (Two lines))
Voltage output: 0 to ±10V ±30mA
Output resistance: 300Ω (External I/O connector)
Response characteristic DC to Approx. 20kHz/ -3dB
High-pass filter 0.5Hz(-3dB), ±15%, -6dB/oct. (AC mode)
Low-pass filter Bessel type (-12dB/oct.)
1, 10, 30, 100, 300, 1kHz (-3dB) ±15% and PASS
Calibration value Strain calibration: ±1 to 9999×10-6 strain
(superimposed on input signal)
Setting method: 4-digits digital switch
Accuracy: ±0.2%±0.5×10-6 strain
External control Auto zero function;
Auto zero range: ±1V
Resolution: 12bit (±1/2000)
Auto zero command;
ON and OFF, panel face switch and external signal
(negative pulse with a pulse width of 100ms or more)
CAL command;
CAL+ and CAL-, panel face switch and external signal
Voltage monitor Display: Character height 8mm numerical display, 7 segment red LED
Dispaly value: −19999 to 19999, sign: minus sign on most significant digit
Unit: V fixed
Minimum scale value: 1, 2, 5, 10 (Rounding off)
Operating conditions ・ Operation temperature range: 0 to +40℃
・ Storage temperature range: −30 to +80℃
・ Humidity: 85%RH or less (non-condensing)
Power supply voltage AC100V±10%, 50/60Hz
Power consumption Approx. 10VA
External dimensions 49.5(W)×138(H)×310(D) mm (not including protrusions)
Weight Approx. 1.6kg
Attachments ・ AC input cord ×1
・ Spare fuse (0.5A) ×1
・ CA8 (BNC-BNC-alligator clip cable 1.5m) ×1
・ Operation manual ×1

Optional accessories

Model Description
CA3Y31 Cable with PRC connector at one end (6 wire) 3m
CA451 Cable with PRC connector at both end (6 wire) 5m
CA7 Coaxial cable with BNC 1.5m
CA8 BNC-alligator clip cable 1.5m


Product catalogue(PDF)
AM50D Product catalogue Dowmload
Operation manual(PDF)
External dimention
Support tools
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