Tektronix 494AP service manual Front-PanelRegisters

Malntsnance- 494A/494ApServlceVol. l

Table 6 - 14

AUXILIARY SYNTHESTZERVALUES AS A FUNCTIONOF N AND A

N	A	F*, Result	N	A	Fou,Result	N	A	Fou,Result	N	A	FooiResult
31	I	200.0MHz	92	1	205.0MHz	32	26	210.0MHz	33	1 9	215.0MHz
31	I	200.2MHz	32	2	205.2MH2	92	27	210.2MH2	33	20	215,2MH2
31	1 0	200.4MHz	32	3	205.4MHz	32	28	210.4MHz 33 21			215.4MHz
31	1 1	200.6MHz	32	4	205.6MHz	32	29	210.6MHz 33 22			215.6MHz
31	1 2	200.8MHz	32	5	205.8MHz	32	30	210.8MHz 33 a			215.8MHz
31	1 3	201.0MHz	32	6	206.0MHz	32	31	211 . 0MHz	33	24	216.0MHz
31	1 4	201.2MHz	32	7	2O6.2MHz	33	0	211.2MH2	33	25	216.2MH2
g1	1 5	201.4MHz	32	I	206.4MHz	33	1	211.4MHz	33	26	216.4MHz
31	1 6	201.6MHz	32	9	206.6MHz	33	2	211 . 6MHz 33 27			216.6MHz
31	1 7	201.8MHz	32	1 0	206.8MHz	33	3	211 . 8MHz 33 28			216.8MHz
31	1 8	201.0MHz	32	1 1	207.0MHz	33	4	212.0MHz 33 29 217.0MHz
31	1 9	202.2MH2 92 1 2 207.2MH2 33					c	212.2MH2	33	30	217.2MH2
31	20	202.4 MHz 32 1 3 2O7.4MHz 33					6	212.4MHz	33	3l	217.4MHz
31	21	202.6MHz 32 1 4 207.6MHz 33					7	212.6MHz	34	0	217.6MHz
31	22	202.8MHz	32	1 5	207.8MHz	33	I	212.8MH2	34	1	217.8MH2
31	23	203.0MHz	32	1 6	208.0MHz	33	9	213.0MHz	g4	2	218.0MHz
31	24	2O3.2MHz	32	1 7	208.2MH2	33	1 0	213.2MH2	34	3	218.2MH2
31	25	203.4MHz 92		1 8	208.4MHz	33	1 1	213.4MHz	34	4	218.4MHz
31	28	203.6MHz 32 1 9 208.6MHz 33					1 2	213.6MHz	34	5	218.6MHz
31	27	203.8MHz 32 20 208.8MHz 33					1 3	213.8MHz	34	6	218.8MHz

3128 204.0MHz 32 21 209.0MHz 33 1 4 214.0MHz 34 7 219.0MHz

3129 2O4.2MHz 32 22 2O9.2MHz 33 1 5 214.2MH2 34 I 219.2MH2

3130 204.4 MHz 32 29 209.4MHz 33 1 6 214.4MHz 34 9 219.4MHz

3131 204.6MHz 32 24 209.6MHz 33 1 7 214.6MHz 34 1 0 219.6MHz

32 0 204.8MHz 32 25 209.8MHz 33 1 8 214.8MHz 34 1 1 219.8MHz 34 1 2 220.0 MHz

Front-PanelRegisters

See Table 6-15.

Table6-15

FRONT.PANELREGISTERS

Writing Datato ShiftRegistersfor Lightsfi4)

DB3-1 - Initiallzesencoderat powerup

Writingto register74 loadsdata into shift registersthat drive all the lightson the front panel,includingthe one for the crt graticule.Four 8-bit shift registersstore the data,requiringeightwlites of four bits each time (one bit for each register)to updatethe front-panellights.This table showsthe order in whichdata is enter€dto controlthe lights.A o turnson the light (exceptin the caseof the crt graticule),anda 1 turns off the light.

Wrlte

Number	DB5	DB4	DB2	DB1	DBO
1	Not Used	MAX HOLD	ZEROSPAN	GRAT ILLUM	TUNEMODE
2	Not Used	MARKERMENU	REMOTE	FINE	UN
3	Not Used	ADDRESSED	10 dB/Drv	READY	WIDE
4	Not Used	HELP	2 dB/DrV	LINETRIG	NARROW
5	RECALL SETTINGS	BLUE SHIFT	IDENT	SINGLESWEEP	B_SAVEA
6	GREEN SHIFT	Not Used	MINNOISE	FREERUN TRIG	VIEWB
7	Not Used	MAX SPAN	AUTORESOLN	INT TRIG	VIEWA
I	AF	PULSE STRETCHER	UNCAL	EXT TRIG	SAVEA

6-62

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