Tektronix WFM601, Service Manual

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WFM 601 - Service Manual
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Specification
The WFM 601 is a half-rack width by three rack unit high serial component
monitor. It employs a bright, white phosphor, post accelerated CRT with lighted
internal graticule. The parallax free internal graticule structure contains
markings for waveform functions. The lightning, diamond, vector, and audio
graticules are electronic, in order to keep from complicating the waveform
graticule.
The monitor is microprocessor controlled to provide greater versatility. Switch
settings that affect the operation of the instrument are continuously polled by the
processor, with any change in status acted upon immediately. Current operating
conditions are preserved in Non-Volatile Random Access Memory (NOVRAM),
which returns the front-panel settings to current ones, in the event of power
interruption (either accidental or routine power down).
Many of the operational measurements are performed on a repetitive basis.
These instruments provide a method of repeating common measurements by
selecting stored measurement settings from a CRT menu list. The operator can
store and name up to 9 common measurement front-panel settings. Measure-
ment specific front-panel settings can then be recalled by pushing the Preset
Menu and selecting the desired preset by name or number.
Many of the functions that were formerly selected by changing internal jumpers
and/or wire straps are now accessible through on-screen menu selections. They
are selected by pushing the appropriate front-panel menu select button. Menu
items are then selected by pushing one or more of the assignable switches and/or
turning the assigned front–panel control. Once selected these menu choices are
retained until changed by subsequent reconfiguration, or turning off the function
with a MENU button.
The front panel provides both assignable switches (located next to the CRT) and
controls (located beneath the CRT), that operate with CRT readout to increase
functionality without cluttering the limited front-panel area. Function of these
switches and controls is dictated by the front-panel display and initial menu
choices.
The WFM 601 is capable of measuring and monitoring 4–2–2 component serial
digital. It incorporates a straight through (non-filtered) display or a differentiated
step filter. The assignable cursors, along with the CRT readout can be used for
time and voltage measurements. The system of menus and CRT readout
simplifies the configuration of this monitor for measurement or monitoring of
signal characteristics.