Tektronix WFM90D, Quick Start Manual, Page: 66 / 170

Performance Verification
4- 2
WFM90D and WFM91D Service Manual
The tests in this section comprise a valid confirmation of instrument performance
when the following requirements are met:
H
Test equipment used to verify performance requirements must be calibrated
and working within the limits specified in Table 4--2 on page 4--3.
H
The WFM 90D or WFM 91D Handheld Waveform, Vector, Picture, and
Audio Monitor must have last been adjusted at an ambient temperature range
of +20
°
C to +30
°
C, and must have been operating for a warm-up period of
at least 20 minutes.
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 s/Div. (1 Line), 10 s/Div. (2 Line), and
1.0 s/Div. (2 Line + MAG), 2%. 0.2 s/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:
≤
1 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
≤
2% 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:
≤
20%. FAST mode:
≥
90%.
4--9
Prerequisites