Tektronix 2445A - Potentiometer Codes and Values (Exerciser 01)

Maintenance-2445A/2455A Service
"CC"
is the previous value (in hexadecimal) of pot AA.
"D" is the DAC Multiplexer code used to select pot AA
(see Table 6-9).
"EEE" is the 12-bit DAC value (in hexadecimal) associ-
ated with pot AA. See Table 6-9 for the approximate
range
of codes for the CCW (counter clockwise) and CW
(clockwise) potentiometer rotations.
"FF" is the code of the previously-activated potentiom-
eter
(see Table 6-9).
"GG" is the row code of the most-recently-activated
switch (see Table 6-10 for definition of row codes).
"H" is the switch-position code: 0 for open; C for
closed.
"I" is the column code of the most-recently-activated
switch (see Table 6-10).
"JJ" is the row code for the previously-activated
switch.
"K" is the switch-position code: 0 for open; C for
closed.
"L" is the column code for the previously-activated
switch.
NOTE
For all momentary switches (except NB TRIG) only
the closed position will
be shown in the switch-
position code locations
(H and K). The NB TRIG
switch has both the open and the closed positions
shown.
6-16
Table 6-9
Potentiometer Codes and Values (Exerciser 01)
Rotation Values
Potentiometer
ccw cw AA
Name
BB
DEEE
BB DEEE
Code
FF 6FFF
00
6000
01 HOLDOFF
FF 3FFF
00 3000 02
Trigger LEVEL
00 1000 FF 1FFF 03
SEC/DIV VAR
FF 5FFF
00
5000 04
Horizontal POSITION
00 0000 FF
3FFF
05
~ (A section)
8
00 0000 FF 3FFF 06
~ (B section)
8
00
0000 FF
3FFF 07
~ REF OR DLY POS
(A section)
8
00
0000
FF
3FFF
08
~ REF OR DLY POS
(B section)
8
FF 07FF
00
0000
09
CH 1 VOL TS/DIV VAR
FF
27FF
00
2000 0A CH 2 VOL TS/DIV VAR
FF 0FFF
00 0000 11
CH 1 Vertical POSITION
FF 1FFF
00
1000 12
CH 2 Vertical POSITION
FF
27FF
00
2000 13 CH 3 Vertical POSITION
FF 37FF
00 3000
14 CH 4 Vertical POSITION
FF 4FFF
00
4800
15
TRACE
SEP
FF
5FFFb
00
5FFFb
16 READOUT INTENSITY
80
6800
FF 6FFF 17 Trace INTENSITY
•The a REF OR DLV POS and a controls are both 180° offset
pairs that continuously rotate. Displayed BB values jump and
the AA code changes when instrument
software switches
between the A and B sections. The D code position shows the
two most-significant bits
of the 14-blt DAC output (In hexade-
cimal), effectively generating 5.5
tum potentiometer values.
bThe
potentiometer midpoint value is 5800, and the intensity is
off (MIN). Maximum intensity is at both the CCW and CW
positions.