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WFM 90 and WFM 91 Service Manual
4–1
Performance Verification
This section contains the following information:
H Summary verification procedure
H List of equipment required to perform the procedures
H Performance verification procedures
Summary Verification
The summary verification is listed in Table 4–1 and is intended for those who are
familiar with the complete performance verification procedures. Procedure titles
and page numbers provide a cross-reference to the performance verification
procedures on the following pages.
Table 4–1: Summary verification procedure
Procedure Procedure Requirement Page #
Preliminary setup Initial equipment connections and control settings. 4–5
Sync separation Signal synchronization will occur with input signals of composite video or
black burst, with sync amplitudes of 40 IRE (300 mV PAL) "6 dB for
internal reference, and sync amplitudes of between 143 mV and 4 V for
external reference.
4–5
Sweep timing and integral linearity Sweep Timing Accuracy: 5 ms/Div. (1 Line), 10 ms/Div. (2 Line), and
1.0 ms/Div. (2 Line + MAG), "2%. 0.2 ms/Div. (1 Line + MAG) "3%.
Integral Linearity: "1%.
4–6
Vertical gain and vertical magnifier registration 1 Volt Full Scale: 1 V input displayed within 1% of 140 IRE (1.00 V PAL).
X5 Gain: Gain accuracy within 5% with 1 V input signal. X5 Gain
Registration: v1 major division of vertical shift from baseline between
unmagnified and magnified signal.
4–7
Variable gain range and vertical position range Variable Gain Range: Input signals between 0.8 V and 2 V can be
adjusted to 140 IRE (1.0 V) display. 160 mV and 400 mV for X5 Gain.
Vertical Position Range: 1 V signal can be positioned so that peak white
and sync tip can be placed at blanking level, with the DC Restorer Clamp
on, regardless of gain setting.
4–7
Overscan v2% variation in baseline of 100 IRE (700 mV PAL) 12.5T (20T PAL)
modulated pulse as it is positioned over the middle 80% of the screen.
4–8
Input and DC restorer frequency response X1 Gain Response (Flat filter selected): 50 kHz to 6 MHz within 2% of
response at 50 kHz. X5 Gain Response (Flat filter selected): 50 kHz to 6
MHz within 5% of response at 50 kHz. Attenuation of 60 Hz (50 Hz PAL)
on Input Signal: SLOW mode: v20%. FAST mode: w90%.
4–9