Flicker Fusion System - 型號 12022

The Flicker Fusion System provides the user with a variety of versatile controls to perform accurate and timely measurements of Critical Flicker Frequency (CFF).

The Lafayette Instrument Flicker Fusion system provides the user with a variety of versatile controls to perform accurate and timely measurements of CFF. Digital circuitry is used to provide extremely accurate frequency generation from 1.0 Hz to 100.0 Hz in 0.1 Hz steps. Unlike previous systems, this generation uses a Bluetooth® connection for maximum convenience. The tablet allows for exact and repeatable frequency settings, and a means for test result scoring and storage.

The test options include five modes of operation to cover virtually any test requirement:

• Simple Flicker: Stimulus is decreased from steady to the point at which the light changes from steady to flicker.
  
• Simple Fusion: Stimulus is increased from flicker to the point at which the light changes from flicker to steady.
• Automatic: Automatically runs test using the Simple Fusion test to determine the fusion frequency and the Simple Flicker test to determine the flicker frequency.
• Adaptive: Displays fixed frequencies and allows the test subject to respond to the frequencies as Flicker or Fusion. This test zeros in on the CFF and automatically ends when the value is determined.
• Self-Control: Allows the test subject to select whether to increase or decrease the frequency. This test is ended by the subject.

The viewing chamber has two lights, one for the left eye and one for the right eye. The light compartments are completely separated, allowing for four stimulus combinations to occur:

• Left: Left eye only
  
• Right: Right eye only
• Coincident: Left and right simultaneously
• Alternate: Left and right alternately
• The viewing chamber is constructed to mitigate extraneous factors, which might distort CFF values. The white lamps produce even illumination over a 1 inch square LED. The stimuli are separated by 2 3/4 inches center to center with a stimulus to eye distance of 15 inches and a viewing angle of 1.9 degrees.

Includes

• Tablet
• Viewing Chamber
• AC adapter
• Hand-held response switch
• Specifications
• Power Supply
• AC/DC Wall mount adapter 5V 5W with USB 1.1 Cable A Male to B Male 4.92 feet Shielded
• Computer USB port
• Frequency: 1.0 to 100.0 Hz in 0.1 Hz increments with an error of 0.05%
• Slide Holder: 2 x 2 in 35 mm holder for optional neutral density filters with 0.5% to 50% light transmission
• Auto Mode Ramp Rates: Options of 0.5, 1, 2, and 4 Hz per second
• External Response: SPDT normally open hand-held switch with 3.5 mm stereo plug
• Typical Maximum Luminance: 58 Cd/m2
• Viewing Angle: 1.9 degrees
• Light/Dark Ratio: 1:1
• Stimulus Color: White
• Viewing Chamber Color: Black
• Viewing Chamber Mask: Hobart 770094 Welding Oxy-Acetylene
• Viewing Chamber:
• Dimensions: 7 x 19 x 16 inches (L x W x H)
• Weight: 6.3 lbs
  

Flicker Fusion System 為用戶提供了多種多樣的控件，可以準確及時地測量臨界閃爍頻率 (CFF)。

Lafayette Instrument Flicker Fusion 系統為用戶提供了多種多樣的控件來執行準確及時的 CFF 測量。 數字電路用於以 0.1 Hz 的步長提供從 1.0 Hz 到 100.0 Hz 的極其精確的頻率生成。 與以前的系統不同，這一代系統使用藍牙® 連接以提供最大的便利。 該平板電腦允許精確和可重複的頻率設置，以及用於測試結果評分和存儲的方法。

測試選項包括五種操作模式，幾乎可以滿足任何測試要求：

• 簡單閃爍：刺激從穩定減少到光從穩定變為閃爍的點。
  
• Simple Fusion：刺激從閃爍增加到光線從閃爍變為穩定的點。
• 自動：使用簡單融合測試自動運行測試以確定融合頻率和簡單閃爍測試以確定閃爍頻率。
• 自適應：顯示固定頻率並允許測試對像對頻率做出響應，如閃爍或融合。 該測試在 CFF 上歸零，並在確定值時自動結束。
• 自我控制：允許測試對象選擇是增加還是減少頻率。 本次測試由受試者結束。

觀察室有兩盞燈，一盞用於左眼，一盞用於右眼。 光室完全分開，允許出現四種刺激組合：

• 左：僅左眼
  
• 右：僅右眼
• 重合：左右同時
• 交替：左右交替

觀察室的構造是為了減輕可能扭曲 CFF 值的外來因素。 白燈在 1 平方英寸的 LED 上產生均勻的照明。 刺激物的中心與中心之間的距離為 2 3/4 英寸，刺激物到眼睛的距離為 15 英寸，視角為 1.9 度。

包括

• 藥片
• 觀察室
• AC適配器
• 手持響應開關
• 規格
• 電源
• AC/DC 壁掛式適配器 5V 5W，帶 USB 1.1 電纜 A 公頭到 B 公頭 4.92 英尺屏蔽
• 電腦USB接口
• 頻率：1.0 至 100.0 Hz，增量為 0.1 Hz，誤差為 0.05%
• 載玻片架：2 x 2 英寸 35 毫米支架，用於可選的中性密度濾光片，透光率為 0.5% 至 50%
• 自動模式斜率：每秒 0.5、1、2 和 4 赫茲選項
• 外部響應：帶 3.5 毫米立體聲插頭的 SPDT 常開手持式開關
• 典型最大亮度：58 Cd/m2
• 視角：1.9度
• 明暗比：1:1
• 刺激顏色：白色
• 觀察室顏色：黑色
• 觀察室面罩：Hobart 770094 焊接氧乙炔
• 觀察室：
• 尺寸：7 x 19 x 16 英寸（長 x 寬 x 高）
• 重量：6.3 磅