User manual

Appendix A: Performance Specification
A–4
WFM 90 & WFM 91 User Manual
A-2.
DC restoration
CATEGORY
DESCRIPTION
DC Restorer Clamp Time REF: Back Porch.
Frequency Response at
60 Hz (50 Hz PAL)
REQ: Attenuation of 60 Hz (50 Hz PAL) on Input
Signal:
Slow Mode: v20%.
Fast Mode: w90%.
REF: Blanking Level Shift with 10% to 90%
APL Change: APL changes from
50% to either 10% or 90% will cause
blanking level shift of 1 IRE unit
(7.14 mV PAL) or less.
REF: Blanking Level Shift Due to Presence
or Absence of Burst: 1 IRE unit
(7.14 mV) or less shift from no color
burst to presence of color burst.
A-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: 0.5 dB from 50 Hz to 20 kHz.
Maximum Input Level Ampli-
tude
REF: +18 dBu.
DC Input Impedance REF: w15 kW.
Audio Output Connector REF: Mini stereo headphone jack.
Maximum Power Output REF: 250 mW.