Apparatus for Determining Planck’s Constant – Advanced Model

Features  

• Manual or auto measurement modes

• Integrated structure and easy to operate

• No crosstalk between spectral lines

• Built-in data acquisition card with software for PC use via USB port

Introduction It used for determining Planck's constant is used to demonstrate the photoelectric effect, The filter adopts high-grade integrated operational amplifier and special circuit design, high-performance photoelectric tube, and the dial is a filter structure with novel design and complete functions. Photocell sensitivity ≥ 1mA / LM, dark current ≤ 10A; zero drift ≤ 0.2% (full scale reading, 10a gear, after 20 minutes of preheating, measured within 30 minutes under normal environment); 3.5-bit LED display, the minimum current display is 10a, the minimum voltage display is 1mV, so the "zero current method" or "compensation method" can be used to accurately measure the cut-off voltage     Specifications  

Description	Specifications
Wavelength of filters	365 nm, 405 nm, 436 nm, 546 nm, 577 nm
Size of apertures	2 mm, 4 mm, 8 mm, 10 mm, 12 mm
Light source	50 W Mercury lamp
Photocell	Wavelength range: 340 ~ 700 nm
	Cathode sensitivity: ≥1 µA (-2 V ≤ UKA ≤ 0 V)
	Anode dark current: ≤5×10-12 A (-2 V ≤ UKA ≤ 0 V)
Current range	10-7 ~ 10-13 A, 3-1/2 digit display
Voltage range	I: -2 ~ +2 V; II: -2 ~ +20 V, 3-1/2 digit display, stability ≤0.1 %
Zero drift	< ±0.2% of full scale (for scale 10-13 A) within 30 minutes after warm-up
Measurement method	Zero current method and compensation method
Measurement error	3%

  Parts List  

Description	Qty
Main Unit	1
Electric Control Unit	1
Special BNC Cable	2
USB Cable	1
Software CD	1
Power Cord	1
Instructional Manual	1