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	厂商名称：Signal Recovery
	商品名称：光学斩波器
	商品型号：198A
	简单信息：Signal Recovery 原隶属于美国EG&G公司,现隶属于美国AMETEK集团公司,是专业生产微弱信号检测类产品的制造商。其锁相放大器、光学斩波器、BOXCAR等始终处于行业的领先水平。

General
The model 198A is a dual frequency optical chopper, using a thin rotating metal blade with an inner set of 11 apertures and an outer set of 18 apertures to simultaneously chop two light beams. The blade is driven by a precision DC motor whose speed is controlled via a phase locked loop that is referenced to either an internal quartz crystal oscillator or an external reference signal. The chopper has three reference frequency outputs, one at each of the frequencies generated by the inner and outer apertures, and one at a frequency equal to their sum. The three frequencies f₁, f₂ and f₁ + f₂ are chosen to be relative primes which significantly reduces mutual harmonic interference.

It is ideal for use in measurements where two modulated beams give rise to a third optical signal at a frequency which is the sum of the two chopped frequencies. The model 198A acts as a chopper for the incident light sources at frequencies f₁ and f₂ and generates a reference signal at a frequency f₁ + f₂ which can be used to drive a subsequent instrument, such as a lock-in amplifier.

Mechanical Dimensions

Model 198A Mechanical Dimensions

Blade Dimensions

Model 198A Blade Dimensions

Specifications

Operation
	Frequency	55 Hz to 1500 Hz
	outer sector	90 Hz to 1500 Hz, 18 apertures, f₁
	inner sector	55 Hz to 917 Hz, 11 apertures, f₂
	sum	145 Hz - 2417 Hz, f₁ + f₂
	Control
	manual	Digital push-button
	external	Application of 0.5 V to 10 V sine or squarewave, 90 Hz to 1500 Hz to Sync In f₁ BNC connector
	Internal Frequency
	accuracy	±20 ppm at 25 °C
	stability	±30 ppm/ °C (range -10 °C to 60 °C)
	Jitter (measured pk-pk and presented as a % of a full cycle)
	outer sector
	90 to 140 Hz	blade only: 0.2%; blade + electronics: < 6%
	140 to 1500 Hz	blade only: 0.2%; blade + electronics: <1.5%
	inner sector
	55 to 100 Hz	blade only: 0.2%; blade + electronics: < 8%
	100 to 917 Hz	blade only: 0.2%; blade + electronics: <2.0%
	Lock indication	Bicolor LED, showing Red when unlocked and Green when locked
	Settling Time	7 s nominal for f₁ + f₂ = 1 kHz from switch-on; 9 s nominal for f₁ + f₂ frequency change from 150 to 2400 Hz; 30 s nominal for f₁ + f₂ frequency change from 2400 to 150 Hz
Outputs	Sync Out f₁	10 V pk-pk squarewave at outer sector chopping frequency (f₁), 90 Hz to 1500 Hz
	Sync Out f₂	10 V pk-pk squarewave at inner sector chopping frequency (f₂), 55 Hz to 917 Hz
	Sync Out f₁ + f₂	10 V pk-pk squarewave at sum chopping frequency (f₁ + f₂), 145 Hz - 2417 Hz
	Connectors	BNC
	Impedance	10 kW. Note that although the output voltage is 10 V pk-pk, the high output impedance means that the outputs can be directly connected to the Reference Frequency input of any SIGNAL RECOVERY lock-in amplifier without causing problems.
Power Requirements		Via power adapter for 110 V AC, 50/60 Hz or 220/240 V AC, 50/60 Hz or external isolated 17 V to 20 V DC or AC rms. supply. State which voltage is required when ordering
Dimensions		4" high x 4.8" wide x 1.7" deep (104 mm wide x 122mm wide x 44mm deep)
Weight		1 lb (0.45 kg) excluding power supply