Tektronix 2230 Service Manual

Maintenance—2230 Service
INPUT_PORTS. This exerciser displays the input data
for all microprocessor input ports. An explanation of the
displayed data is shown in Table 6-23.
A_TO_D_TESTS/SAMPLES. This exerciser sets the
number of acquisitions used to test the A/D Converter.
Turn the CURSORS control to select the number of
4096 byte acquisitions (a power of 2 is best) used to test
the A/D Converter (see LINEARITY exerciser).
A_TO_D_TESTS/LINEARITY. This exerciser tests the
acquisition A/D converter for missing bits.
Inject a highly linear 11 division vertically centered, (2 x
4096 x 50) ns duration triangle wave signal into the CH 1
or X input. Set the trigger so that the oscilloscope triggers
close to the negative peak.
If any codes are missing in samples x 4096 acquisi
tions a message indicating that there were missing codes
is displayed (and sent to the communications option if
operating in extended diagnostics).
Setting the trigger point close to the positive peak tests
negative going conversions.
The display is a histogram with a vertical scale of 5 x
samples X (codes converted) per division and a horizontal
scale of 0 to 255 codes across 10 divisions left to right
(25.5 codes per division).
COM_OPTION/DEBUG. This exerciser is used in
debuging the communications option. Debug outputs a
test message and displays any incoming messages (data)
on the crt.
PICTURES. The picture exercisers use line drawings to
exercise the instruments display system. The Tekbug is a
line drawing of the Tektronix symbol. The Wizard is a multi
function display. The gain of the display controller is
controlled by the CURSORS control. The position of the
display is controlled by the CH 1 and CH 2 POSITION
controls. If the VERTICAL POSITION and CURSORS
controls are not turned for about 5 seconds, the display is
automatically moved through its gain (CURSORS) and
POSITION ranges.
Table 6-23
Display Format Digit Definitions
Input Port Name
U Number
Crt Name
Number of
Bits Displayed
Acquisition Address Buffer U3427 and U3428 ACQ_ADDR_BUF
16
Clock Delay Register
U4230 CLK_DELAY_REG
8
B Delay Timer
U4123 and U4124
B_DELAY_TIMER
12
Front Panel Instrument Status
U6103 FPJNSTAT
8
Front Panel Address Data
U6102
FP_AD_DATA
8
6-30

Tektronix 2230 Specifications

General

Brand	Tektronix
Model	2230
Category	Test Equipment
Language	English