R7903

Tektronix R7903
500 MHz non-storage mainframe Tektronix R7903 Produced from 1974 to 1982 Manuals R7903 Operator Manual (PDF) R7903 Service Manual (PDF) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix R7903 is a rackmount version of the 7903, a 3-slot 7904 that takes only one horizontal plug-in. Otherwise, aside from being rackmount shape, it the same as a 7904.

Key Specifications

Bandwidth	500 MHz
Fastest calibrated sweep	500 ps/Div (with 7B92A, other time bases "uncalibrated for first 60 ns")
Acceleration voltage	24 kV

Internals

Early R7903 (SN B159999 and earlier) have issues with horizontal aberrations for sweep rates of 1 ns/Div or faster. After discovery of the issue modification kits (040-0801-00) that replace the horizontal amplifier were offered. For more information see the manual of the 067-0657-00 Normalized Ramp Generator that was use to investigate this issue.

Pictures

Option 4: brighter, smaller scan CRT
Option 4: brighter, smaller scan CRT
R7903 rear
R7903 Option 4 trace

CRTs used in the R7903

Page	Part nos	Description	Designers	Used in
154-0644-00	154-0644-00 • 154-0644-04 • 154-0644-05 • 154-0644-09	CRT with distributed deflection plates	Ken Hawken	7704A • 7854 • 7904 • 7904A • R7903

Custom ICs used in the R7903

Page	Model	Part nos	Description	Designers	Used in
155-0009-00	M001	155-0009-00	horizontal lockout logic	Les Larson	7504 • 7514 • 7704 • 7704A • R7704 • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • 7934 • 7104
155-0010-00	M004	155-0010-00	chop divider and blanking	Les Larson	7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7854 • 7904 • R7903 • 7904A • 7934 • 7104
155-0011-00	M012	155-0011-00	clock and chop blanking	Les Larson	485 • 7313 • 7403N • R7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • 7904A • R7903 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • AN/USM-281C
155-0012-00	M015	155-0012-00	Z Axis Logic	Les Larson	485 • 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • R7912 • 7934 • 7912AD • 7912HB • 7104 • R7103
155-0013-00	M022	155-0013-00 • 155-0013-01	horizontal chop and alt. binary	Les Larson	7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7854 • 7904 • 7904A • R7903 • 7934 • 7104
155-0022-00	M036	155-0022-00 • 155-0022-01	analog multiplexer	Gene Andrews	147 • 148 • 149 • 335 • 468 • 1430 • 1441 • 1461 • 1900 • 1910 • 2220 • 2221 • 2230 • 5223 • 5403 • 5440 • 5441 • 5443 • 5444 • 5A38 • 7313 • 7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • R7912 • 7912AD • 7912HB • 7904 • R7903 • 7904A • 7934 • 7A12 • 7A18 • 7A18A • 7B52 • 7B53N • 7D10 • 7D11 • 7D12 • NT-7000 • P7001
155-0059-00	M077A	155-0059-00	HF amplifier	Thor Hallen	7834 • 7844 • 7854 • 7904 • R7903 • R7912 • 7912AD
155-0060-00	M071E	155-0060-00 • 155-0060-01	channel selector amplifier	Hans Springer	R7903 • 7904 • R7912
155-0064-00	H074A	155-0064-00	vertical output amplifier		7834 • 7854 • 7904 • R7903 • 7912AD • 485 • PG502
155-0065-00	H074	155-0065-00 • 155-0064-01 • 155-0125-00	deflection amplifier		7844 • 7904 • R7912 • R7903
155-0067-02	M091B	155-0067-00 • 155-0067-02 • 155-0067-03	SMPS controller	Joe Burger • Gene Andrews	7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904 • 7904A • 7934 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • 308 • 434 • 485 • 690 • P7001
155-0078-00	M084	155-0078-xx • 155-0273-00 • 155-0274-00	broadband amplifier	John Addis	464 • 465 • 466 • 468 • 475 • 475A • 475M • 485 • 7834 • 7844 • 7854 • 7904 • R7903 • R7912 • 7912AD • 7912HB • 7104 • 7A16A • 7A16P • 7A24 • 7A26 • 7A42 • 067-0587-01 • 067-0680-00 • AM503 • PG502 • PG508 • DC510 • DC5010 • FG5010
155-0095-00	155-0095-00	155-0095-00 • 155-0095-01 • 155-0095-03	HF differential amplifier		7834 • 7844 • 7904 • R7903 • R7912 • 7912AD
203-0126-90	M126	203-0126-90	ft doubler amplifier	Hans Springer	R7903 • 7904 • 7844

Custom ICs used in the 7000 series readout system

Page	Model	Part nos	Description	Designers	Used in
155-0014-01	M019D	155-0014-00 • 155-0014-01	A/D converter	Barrie Gilbert	7000 series readout system • 7854 • 7934 • 7J20 • 7L5 • P7001
155-0015-01	M020F	155-0015-00 • 155-0015-01	analog data switch	Barrie Gilbert	7000 series readout system • 7854 • 7934
155-0017-00	M025	155-0017-00	5 MHz decade counter	Barrie Gilbert	7000 series readout system • 7854 • 7934
155-0018-00	M026	155-0018-00	zeros logic control	Les Larson	7000 series readout system • 7934
155-0019-00	M027	155-0019-00	decimal point and spacing control	Les Larson	7000 series readout system
155-0020-00	M028	155-0020-00	output assembler	Les Larson	7000 series readout system
155-0021-00	M029C	155-0021-00 • 155-0021-01	timing generator	Les Larson	7000 series readout system • 7854 • 7934
155-0023-00	M160	155-0023-00	character generator (0 1 2 3 4 5 6 7 8 9)	Barrie Gilbert	7000 series readout system
155-0024-00	M161	155-0024-00	character generator (↓ < I / + - + C Δ >)	Barrie Gilbert	7000 series readout system
155-0025-00	M162	155-0025-00	character generator (m μ n p X K M G T R)	Barrie Gilbert	7000 series readout system
155-0026-00	M163	155-0026-00	character generator (S V A W H d B c Ω E)	Barrie Gilbert	7000 series readout system
155-0027-00	M164	155-0027-00	character generator (U N L Z Y P F J Q D)	Barrie Gilbert	7000 series readout system