User manual

Getting Started: Product Description
WFM 90 & WFM 91 User Manual
1–3
NOTE. Only the NiCad battery pack recharges in the instrument.
Alkaline batteries are not recharged. The message
LOW BAT is
displayed in the on-screen readout when the batteries get critically
low on power.
Menu-Assisted Monitoring Operation
The menus use a combination of on-screen readout and multi-use
buttons, in conjunction with the Arrow Buttons, to control most of
the monitoring functions. Menus are entered by pressing one of the
MENU, CONFIG, or LINE SEL buttons. Menus are exited by pressing
the entry button for the open menu, or by entering another menu.
Video and Audio Input/Output
The WFM 90 and WFM 91 displays signals from the one channel of
composite video input, or from the one channel of audio input. An
external reference input allows the use of an external sync signal.
The video and external reference inputs are BNC connectors, each
with a rear-panel switch providing the choice of an internal 75 W
signal termination, or an unterminated high-impedance input. The
audio input is a standard 3-pin XLR connector.
The video output is a BNC connector that will drive a remote
monitor or video switcher. The audio output is a mini-headphone
stereo jack which outputs the mono input signal to both stereo
channels. The audio volume is fixed for each reference level. The
larger the displayed signal, the louder the volume.
Waveform Display Mode
The Waveform display mode provides a voltage-versus-time display
of the video signal with three standard sweep rates: 1H (5 s/divi-
sion), 2H (10 s/division), and 2F (two field). Each line-rate sweep
can be magnified X10 to sweep rates: 1H Mag (0.5 s/division), and
2H Mag (1 s/division). The 2F sweep is magnified by approximate-
ly X20.
Vertical gain is fixed at X1 or X5, or variable from 45% to 155%.
The gain setting tracks between the Waveform and Vector display