MK-668G Wow Flutter Meter

Product Description

MK-668G Wow Flutter Meter

The MK-668G is designed for measuring the wow flutter in recording/playback equipment such as recorders for sound and video tapes, discs, and film.

Measurements can be made under standards presently in effect, namely, at 3kHz for the RMS, NAB and at 3.15kHz for IEC (DIN, CCIR)
The minimum input requirement, 0.1mVrms, makes it possible to measure directly from reproducing heads and other pick-up devices.

Drift, or tape speed, can be measured on a 4-digit frequency counter simultaneously with the wow flutter
The GO-NO condition is judged by comparing the wow flutter and tape speed with a comparator and raises the efficiency in the production line

FEATURES

•  Wide measurable wow flutter range 0.0015% for testing the highest grade to general-purpose recording and playback equipment.
•  Accurate measurement under different standards: Effective value for RMS, average value for NAB, and peak-value for IEC (DIN, CCIR).
•  Wow flutter measurements under standard weighted and specified unweighted conditions; in addition, wow and flutter values can be separately determined.
• Monitor lamp indicates the proper input voltage level for wow flutter and tape speed measurements.
•  Stable and accurate signal output at 3kHz and 3.15kHz (crystal-controlled) available for recording a test tape, disc, etc.
•  FIM measurements possible in accordance with DIN45411 specification

SPECIFICATIONS

Input Frequencies

3kHz ±300Hz, for RMS, NAB.

3.15kHz ±300Hz, for IEC (DIN, CCIR).

 

Input Voltage Range

Two range: 0.1 to 30mVrms, and 5mV to 10Vrms

 

Input Impedance

Approx. 300kΩ unbalanced

 

Wow Flutter Range

0.0015% to 3% in six ranges

0.003% to 3% at 0.1 to 30mV input

0.01%, 0.03%, 0.1%, 0.3%, 1% and 3% at full scale

 

Meter Indication

Peak value for IEC (DIN, CCIR)

Average value for NAB

Effective value for RMS

 

Indication Accuracy

±5% of full scale at 4Hz

 

Frequency Characteristics
Weighted	0.2 to 200Hz in accordance with standards for IEC (DIN, CCIR) and NAB.
Wow Flutter separation
• Wow	0.5Hz to 6Hz
• Flutter	6Hz to 200Hz
Unweighted
• NAB	0.5 to 200Hz -3dB±1dB
• IEC(DIN, CCIR)	0.3 to 200Hz -3dB±1dB
Unweighted
Standards Response Roll off IEC (DIN, CCIR) 0.3 to 200Hz -3dB±1dB <-6dB/oct below 0.3Hz <-15dB/oct above 200Hz NAB 0.5 to 200Hz -3dB±1dB <-6dB/oct below 0.5Hz <-15dB/oct above 200Hz

 

FIM Measurement
Range	Corresponding to Wow Flutter
Filter Characteristics
• FIM : ON	L.P.F. 500Hz -3dB±1dB Roll off above 500Hz <-36dB/oct
• 160HzFIL. : ON	H.P.F. 100Hz -3dB±1dB Roll off above 100Hz <-12dB/oct

 

Tape Speed Range

3kHz ±1kHz : 4-digit indication

 

Internal Recording signal
Frequency	3kHz and 3.15kHz ±3×10-5 (crystal-controlled)
Output Voltage	Approx. 0.2Vrms at open circuit
Output Impedance	Approx. 600O unbalanced
Distortion	Less then 0.5%

Drift
Output voltage	±1V per ±10% drift
Output impedance	600O ±10% unbalanced

 

To Recorder
Output voltage	DC 1V±5% at full scale
Output impedance	600O ±10% unbalanced

 

Flutter
Output voltage	1Vrms±5% at full scale
Output impedance	600O ±10% unbalanced

 

Frequency Counter (at independent operation)
Range	10Hz to 99.99kHz in two ranges
	0.01 to 9.999kHz, 0.1 to 99.99kHz
Accuracy	±(1 count+reference frequency accuracy)
Reference Frequency	600kHz ±1×10-4 (0 to 40ºC)
Input Impedance	Approx. 300kO unbalanced
Gate Time	0.1 sec, 1 sec in 2 ranges
Indication	4-digit display

 

General Data
Power Requirements	AC 100V, 115V, 215V, or 230V±10% 50/60Hz; approx. 15VA
Dimensions, overall	Approx. 360(W)×165(H)×290(D)mm
Weight	Approx. 5kg
Accessory, furnished	Input/Output cord : 1ea

 

*	Specifications are subject to change without notice.