User guide

Section I

General Information

1-1 Description

1-2 The 8566/8567/8568 Color LCD Retrofit Kit is a drop-in replacement for the

monochrome CRT in the HP 85662A display. The Retrofit Kit uses a state-of-

the-art Sharp 6.4” TFT color LCD with a resolution of 640 x 480 pixels.

1-3 The intensity adjustment works as before; adjust the front panel intensity knob as

you would for the CRT.

1-4 The front panel align adjustment is no longer used.

1-5 There are two color schemes available. The focus pot adjusted clockwise selects

the “Classic” color scheme, and counterclockwise selects the “TEP” color

scheme. In the classic color scheme, trace A is shown as yellow, trace B is cyan,

and trace C is magenta. Text, graticule, and marker dots are white. Display line

and user defined test limit graphics are green. In the TEP color scheme, trace A is

shown as green, trace B is shown as red, and trace C is shown as magenta. Text is

yellow, and the graticule is blue. Marker dots, display line, and user defined test

limit graphics are white.

1-6 Sweeps of 10mS and faster are now digitized, making it possible to save and print

a screen capture in the fast sweep mode. Great care was taken to ensure fast

sweep operates virtually identical to how it did when a CRT and analog signal

were used.

1-7 GPIB automation software including verification software is still fully

compatible.

1-8 The kit also includes a software utility to write and print screen captures. The

utility can be used with any printer interfaced to a standard Windows

98/2000/ME/XP computer that is equipped with a GPIB card and National

Instruments® NI 488.2 drivers.

1-9 Display-off and -on (shift-G and shift-H) still works as before.

1-10 The LCD backlight lamp is replaceable and has a typical lifetime of 50,000 hours

of operation. The lamp reaches full brightness within 5 minutes of being turn on.

1-11 To preserve the functionality of the rear panel X, Y, and Z display outputs, the

A1A2, A1A4, and A1A5 boards have not been removed.

1-12 The LCD kit is powered from the unregulated +23V supply that was used for the

CRT high voltage. This is a dedicated, fused supply that is isolated from the rest

of the power systems.

1-13 Specifications.

1-14 Instrument specifications are unchanged.

1-15 Calibration

1-16 The calibration procedure is unchanged.

1-17 Adjustments

1-18 High Voltage and CRT Display adjustments are obsolete. Fast sweep horizontal

offset and gain as well as vertical offset and gain adjustments have been added.

They are accessed from the front panel and stored in the new A3A4 nonvolatile

memory.