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WFM90D and WFM91D Service Manual
1-5
Table 1- 3: Audio mode
Category Description
Reference Levels REQ: --10 dBu, 0 dBu, +4 dBu, +8 dBu.
REF: Nominal MIC reference: --50 dBu.
Measurement Accuracy REQ: 0.5 dB at 1 kHz.
Frequency Response REQ: 0.5dBfrom50Hzto20kHz.
Maximum Input Level Amplitude REF: +18 dBu.
DC Input Impedance
REF: ≥15 kΩ.
Audio Output Connector REF: Mini stereo headphone jack.
Maximum Power Output REF: 250 mW.
Table 1- 4: Horizontal deflection system
Category Description
Sweep REQ: Sweep will occur in all Horizontal mode settings with or wit hout synchronization.
REF: Sweep Length: Two Line and Two Field sweep length is nominally 12 divisions.
1LINE Sweep Repetition Rate REQ: Equal to line-rate of applied video or external sync.
2LINE Sweep Repetition Rate REQ: Equal to half line-rate of applied video or external sync.
2FLD Sweep Repetition Rate REF: Displays 2 full fields, including the field-rate sync between them.
2FLD Sweep Magnification REF: Approximately X20.
Sweep Magnifier Registration REF: Magnification occurs about the center of the screen.
Timing Accuracy REF: All timing and linearity specifications exclude the first and last major divisions of the
unmagnified display.
REQ: 10 s/division (2LINE): Within 2%.
REQ: 5 s/division (1LINE): Within 2%.
REQ: 1 s/division (2LINE + MAG): Within 2%.
REQ: 0.5 s/division (1LINE + MAG): Within 3%.
Integral Linearity REQ: Within 1%.
REF: Measured between the 10 s and 110 s points on the 10 s/division (2LINE)
sweep.
Horizontal Position REF: Any portion of a synchronized video sweep can be positioned on-screen in all sweep
modes.