7M13: Difference between revisions

Latest revision as of 06:05, 12 October 2023

Tektronix 7M13
Readout Unit 7M13 front panel Compatible with 7000-series scopes Produced from 1974 to 1985 Manuals Tektronix 7M13 Manual (OCR) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 7M13 is a "Readout Unit" that allows the user to enter text into the scope's readout system for that module slot. It is intended to include identifying text and picture numbers for photographic documentation.

A built-in camera counter displays a pre-settable count in the second (lower) readout channel, which can be advanced manually by push-button or automatically by the camera shutter. The only editing function provided is to overwrite the character just entered (by holding the MODIFY button). To correct other errors, one needs to erase the display field.

Key Specifications

Character positions	2 fields (top, bottom) of 10 characters each
Camera counter	0-99, lower field only; ground contact closure input

Internals and Repair Issues

The 7M13 is relatively simple and robust electrically, consisting mostly of 74xx TTL logic. However, there can be electromechanical problems due to the number of switches. For example, a 7M13 may appear unresponsive if the "(P)RESET" button for the camera counter is not fully released.

The 7M13 uses four 7489 TTL 16×4 RAMs to store the characters entered, and four 155-0038-01 Tek-made D/A converter chips to drive the analog row/column readout lines. One RAM and D/A each are assigned to row and column readout signals in each channel, and are addressed by a counter synchronized to the readout time slot pulses. In other words, characters are not stored as ASCII bytes, but as row/column pairs matching the readout system's character set. The keyboard is arranged in a matching matrix of double-contact (DPST) keys that generate the row/column coordinates through 74147 priority encoders.

Links

Documents Referencing 7M13

Document	Class	Title	Authors	Year	Links
Tekscope 1974 V6 N1.pdf	Article	CRT READOUT – Nicety or Necessity?		1974	7M13

Prices

Year	1974	1976	1980	1984
Catalog price	$375	$425	$600	$1,075
In 2022 Dollars	$2,300	$2,300	$2,200	$3,200

Pictures

7M13 front panel
7M13, right side
7M13, left side
Readout example (7844 Opt.78 mainframe)
7M13 in 7633

Components

Some Parts Used in the 7M13

Part	Part Number(s)	Class	Description	Used in
155-0038-01	155-0038-00 • 155-0038-01	Monolithic integrated circuit	5-bit current source D/A converter	7A42 • 7D13 • 7D14 • 7M13 • T4005

@@ Line 1: / Line 1: @@
-{{Plugin Sidebar  |
+{{Plugin Sidebar
-manufacturer=Tektronix | type=7M13 |
+|manufacturer=Tektronix
-summary=Readout Unit |
+|series=7000-series scopes
-image=Tek-7m13-front.jpg  |
+|type=7M13
-caption=7M13 front panel |
+|summary=Readout Unit
-introduced=1974 |
+|image=Tek-7m13-front.jpg
-discontinued=1985 |
+|caption=7M13 front panel
-series=7000-series scopes|
+|introduced=1974
-manuals=
+|discontinued=1985
-* [[Media:070-1577-00.pdf|Tektronix 7M13 Manual]] (OCR, PDF)
+|manuals=
+* [[Media:070-1577-00.pdf|Tektronix 7M13 Manual]] (OCR)
 }}
 The '''Tektronix 7M13''' is a "Readout Unit" that allows the user to enter text
 into the [[7000 series readout system|scope's readout system]] for that module slot.
@@ Line 17: / Line 17: @@
 A built-in camera counter displays a pre-settable count in the second (lower) readout channel,
 which can be advanced manually by push-button or automatically by the camera shutter.
-The only editing function provided is to overwrite the character just entered (by holding the MODIFY button).
+The only editing function provided is to overwrite the character just entered (by holding the MODIFY button). To correct other errors, one needs to erase the display field.
-To correct other errors, one needs to erase the display field.
 {{BeginSpecs}}
@@ Line 27: / Line 26: @@
 ==Internals and Repair Issues==
-The 7M13 is relatively simple and robust electrically (consisting mostly of 74xx TTL logic),
+The 7M13 is relatively simple and robust electrically, consisting mostly of 74xx TTL logic.
-however, due to the number of switches, there can be electromechanical problems.
+However, there can be electromechanical problems due to the number of switches.
-For example, a 7M13 may appear unresponsive if the camera counter "(P)RESET" button is not fully released.
+For example, a 7M13 may appear unresponsive if the "(P)RESET" button for the camera counter is not fully released.
 The 7M13 uses four 7489 TTL 16×4 RAMs to store the characters entered,
@@ Line 35: / Line 34: @@
 One RAM and D/A each are assigned to row and column readout signals in each channel,
 and are addressed by a counter synchronized to the readout time slot pulses.
-In other words, characters are not stored in ASCII bytes but in row/column pairs
+In other words, characters are not stored as ASCII bytes, but as row/column pairs
 matching the [[Media:Tek7000-readout-charset.jpg|readout system's character set]].
 The keyboard is arranged in a matching matrix of double-contact (DPST) keys
@@ Line 44: / Line 43: @@
 * [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/readout_unit_7M13.htm Tek 7M13 page @ amplifier.cd]
 * [http://www.barrytech.com/tektronix/tek7000/tek7m13.html Tek 7M13 page @ barrytech.com]
+{{Documents|Link=7M13}}
 ==Prices==
@@ Line 60: / Line 60: @@
 |align=right| $1,075
 |-
-! 2015 value
+! In 2022 Dollars
-|align=right| $1,800
+|align=right| $2,300
-|align=right| $1,760
+|align=right| $2,300
-|align=right| $1,720
+|align=right| $2,200
-|align=right| $2,440
+|align=right| $3,200
 |-
 |}
@@ Line 81: / Line 81: @@
 </gallery>
-{{Custom ICs|7M13}}
+==Components==
+{{Parts|7M13}}
 [[Category:7000 series special-function plugins]]
-[[Category:Specifications needed]]