Tektronix WFM90D, Quick Start Manual

Page: 42 / 170

Functional Overview
2- 12
WFM90D and WFM91D Service Manual
Onscreen Readouts
The
WFM90D and WFM91D
use onscreen messages to alert you to certain
monitoring conditions. Figure 2--8 shows example readout messages and their
locations.
20
40
60
80
100
--20
--40
0
GAIN UNCAL 10uS/DIV EXT REF
VX.XX
LOW BAT
10
3
6
11
8
9
DIGITAL
NO SYNC
1
GREEN
2
EDH CHK
4
>CABLE
5
ERRORED SECONDS
7
FF CRC:
AP CRC:
ELAPSED:
Figure 2- 8: Onscreen readout messages
1. The video message reports the video type. Possible messages are shown in
Table 2--1.
2.
The component readout shows which component is selected for display
through the digital Waveform menu: COMPOSITE, GREEN, BLUE, RED,
Y, Pb, Pr, C. The readout only appears if digital video is locked or if INPUT
CTL is set to DIGITAL.
3.
The EXT REF message appears in the Waveform and Vector display modes
when the video signal is locking to an external video reference signal.
4.
The EDH report appears when EDH is turned on.
5.
When the cable report is turned on (see Configuration Menu , page 2--21) the
message displays
>CABLE
if the cable length is greater than approximately
200 meters. If the cable is shorter than 200 meters, there is no readout.
NOTE
. The CABLE RPT readout is meaningful only when the instrument is
operating in DIGITAL mode. In ANALOG mode, you can ignore the readout.
Readout Description