647: Difference between revisions

Latest revision as of 10:40, 14 August 2024

Tektronix 647
50 MHz scope 647A front view Produced from 1963 to 1967 Manuals Tektronix 647 Manual Tektronix RM647 schematics (large format) tentative specifications.pdf Tektronix 647 HV transformer winding data Type 647 Notes Tektronix Type 647 and 647A Calibration Outline (OCR) Tektronix 647A Manual (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 647 is a 50 MHz oscilloscope with plug-ins for both vertical and horizontal deflection. It was introduced in late 1963, along with a minimal set of plug-ins, and replaced by the higher bandwidth 647A in 1967. Except for the CRT and the rectifiers in the HV power supply, the 647 is all solid state.

The original 647 project leader was Oz Svehaug in 1962. From 1963 onward, Oliver Dalton took over.

The intent was to offer a higher performance scope in a small form factor, roughly the size and weight of the 560 series. It was promoted as “ruggedized” with an extended operating temperature range, and higher shock and vibration ratings than previous lab grade instruments.

The 647 uses 10 series vertical and 11 series time base plug-ins. At introduction, the 10A2 a dual channel 50 MHz vertical, 11B1 single time base, and 11B2 dual time base were offered. The 10A1 45 MHz differential comparator was introduced in 1965, the 10A2A amplifier in 1967. The 10 and 11 series plug-ins are unique to the 647 and 647A.

Key Specifications

Bandwidth	DC to 50 MHz with 10A2 plug-in, 45 MHz with 10A1 (35 MHz at <5 mV/div)
Rise time	5.8 ns with 10A2, 7.8 ns with 10A1 (10 ns at <5 mV/div)
CRT	T6470, P31 std / P11 opt., 6 cm × 10 cm, 14 kV acceleration
Power	108/115/122/216/235/244 V_AC ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz; 185W with 10A2 & 11B2 plug-in
Operating Temperature	–30 C° to +65 C°
Cooling	AC Fan (only in rack variant)
Thermal Protection	Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level
Weight	18.4 kg (40.5 lbs)

Internals

Unlike the threaded knob used for retaining the 530/540 series plug-ins, the 647 uses a lever-actuated cam mechanism. The single lever both engages and disengages the plug-in with a quick, smooth motion. Many users considered it to be the best plug-in retaining system Tek had ever offered.

Unlike the 560 series where the plug-ins directly drive the CRT deflection plates, the 647 has amplifiers for both the vertical and horizontal signals in the mainframe. In addition to supporting the higher bandwidth, the amplifiers provide a normalized gain at the plug-in interface, eliminating the need to adjust the gain or sweep cal every time a plug-in was swapped.

The 647 has a 140 ns delay line between the vertical plug-in connector and the input of the vertical amplifier. The interface between the vertical plug-in and the mainframe is a 93 Ω controlled-impedance connection. This is in contrast to the 500-series scopes, which appear to the plug-in as a high impedance.

The horizontal and vertical plug-ins are not electrically interchangeable. Only a 10 series plug-in will work in the vertical compartment, and only a 11 series time base will work in the horizontal compartment. X-Y mode requires the use of the external horizontal input in an 11 series time base.

The 647 uses the T6470 CRT with electromagnetic trace rotation and 14 kV total accelerating voltage. The HV power supply contains five 5642 rectifier tubes: three for the +11.2 kV CRT anode supply, one for the -2.2 kV CRT cathode, and one for the -2.2 kV CRT grid/blanking.

The calibrator in the 647 is based on a 4 kHz crystal, which is divided down to 1 kHz ±1 Hz.

The solid extender for 647 plug-ins is the 013-077.

Pictures

647

647 with 10A1 and 11B2
647 Right Side
647 with MOD165K

647A

647A Front View
647A Left View
647A Right View
647A Rear View
647A with 10A1 and 11B2A
647A
647A
647A rear connections
10A2A and 11B2A in 647A
647A
647A
647A
647A
647A
647A
647A
647A
647A
647A

RM647

RM647 Front View
RM647

Components

Some Parts Used in the 647

Part	Part Number(s)	Class	Description	Used in
5642	154-0051-00 • 154-0079-00	Vacuum Tube (Diode)	directly-heated high-voltage rectifier	310 • 310A • 316 • 317 • 360 • 453 • 502 • 502A • 503 • 504 • 506 • 513 • 515 • 516 • 524 • 529 • RM529 • 533 • 533A • 535 • 536 • 543 • 543A • 543B • 545 • 545A • 545B • 547 • 551 • 555 • 556 • 560 • 561 • 561A • 561S • 564 • 567 • 570 • 575 • 581 • 581A • 585 • 585A • 647 • 647A
T6470	154-0434-00 • 154-0448-00	CRT	CRT	647 • 647A

Some Parts Used in the RM647

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@@ Line 14: / Line 14: @@
 * [[Media:Tektronix 647 tentative specifications.pdf|tentative specifications.pdf]]
 * [[Media:120_0332.pdf|Tektronix 647 HV transformer winding data]]
-* [[Media:Tek 647 notes.pdf|Type 647 Notes]] (needs OCR)
+* [[Media:Tek 647 notes.pdf|Type 647 Notes]]
 * [[Media:Tek 647a cal outline.pdf|Tektronix Type 647 and 647A Calibration Outline]] (OCR)
-<small>
+* [[Media:070-0614-00.pdf|Tektronix 647A Manual]]
-'''Alternate copies'''
-* [https://bama.edebris.com/download/tek/647a/tek%20647a.djvu Tektronix 647A Manual] (DjVu @ BAMA)
 }}
 The '''Tektronix 647''' is a 50 MHz oscilloscope with plug-ins for both vertical and horizontal deflection.
@@ Line 24: / Line 22: @@
 Except for the CRT and the rectifiers in the HV power supply, the 647 is all solid state.
-The original 647 project leader was [[Oz Svehaug]] in 1962. From 1963 onward, the project was led by [[Oliver Dalton]].
+The original 647 project leader was [[Oz Svehaug]] in 1962. From 1963 onward, [[Oliver Dalton]]  took over.
 The intent was to offer a higher performance scope in a small form factor, roughly the size and weight of the [[560-series_scopes|560 series]].
-Additionally, the 647 was promoted as “ruggedized” with an extended operating temperature range, and higher shock and vibration ratings than previous lab grade instruments.
+It was promoted as “ruggedized” with an extended operating temperature range, and higher shock and vibration ratings than previous lab grade instruments.
 The 647 uses 10 series vertical and 11 series time base plug-ins.
 At introduction, the [[10A2]] a dual channel 50 MHz vertical, [[11B1]] single time base, and [[11B2]] dual time base were offered.
-A differential comparator, the [[10A1]] was introduced in 1965. These plug-ins are unique to the 647 and 647A.
+The [[10A1]] 45 MHz differential comparator was introduced in 1965, the [[10A2A]] amplifier in 1967.
+The 10 and 11 series plug-ins are unique to the 647 and 647A.
 {{BeginSpecs}}
-{{Spec | Bandwidth   | DC to 50 MHz with [[10A2|Type 10A2 plug-in]]  }}
+{{Spec | Bandwidth             | DC to 50 MHz with [[10A2|10A2 plug-in]], 45 MHz with [[10A1]] (35 MHz at <5 mV/div) }}
-{{Spec | Rise time   | 5.8 ns }}
+{{Spec | Rise time             | 5.8 ns with 10A2, 7.8 ns with 10A1 (10 ns at <5 mV/div)}}
-{{Spec | Bandwidth   | DC to 45 MHz (35MHz at <5mV/div) with [[10A1|Type 10A1 plug-in]]  }}
+{{Spec | CRT                   | [[T6470]], P31 std / P11 opt., 6 cm × 10 cm, 14 kV acceleration }}
-{{Spec | Rise time   | 7.8 ns (10ns at <5mV/div) }}
+{{Spec | Power                 | 108/115/122/216/235/244 V<sub>AC</sub> ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz; 185W with [[10A2]] & [[11B2]]  plug-in }}
-{{Spec | Acceleration voltage | 14 kV}}
+{{Spec | Operating Temperature | –30 C° to +65 C°}}
-{{Spec | Screen Area | 6 cm × 10 cm}}
+{{Spec | Cooling               | AC Fan (only in rack variant) }}
-{{Spec | Power       | 108/115/122/216/235/244 V<sub>AC</sub> ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz; 185W with [[10A2]] & [[11B2]]  plug-in }}
+{{Spec | Thermal Protection    | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}
-{{Spec | Construction  | Aluminum alloy chassis. Anodized front panel}}
+{{Spec | Weight                | 18.4 kg (40.5 lbs) }}
-{{Spec | Operating Temperature  | -30 C° to +65 C°}}
-{{Spec | Cooling  | AC Fan (only in rack variant) }}
-{{Spec | Thermal Protection | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}
-{{Spec | Weight| 40.5 lbs / 18.4 kg }}
 {{EndSpecs}}
 ==Internals==
-Unlike the threaded knob used for retaining the [[letter-series and 1-series plug-ins|530/540 series plug-ins]],
+Unlike the threaded knob used for retaining the [[letter-series and 1-series plug-ins|530/540 series plug-ins]], the 647 uses a lever-actuated cam mechanism.
-the 647 uses a lever actuated cam mechanism.
 The single lever both engages and disengages the plug-in with a quick, smooth motion.
 Many users considered it to be the best plug-in retaining system Tek had ever offered.
-Unlike the [[560-series_scopes|560 series]]
+Unlike the [[560-series_scopes|560 series]] where the plug-ins directly drive the CRT deflection plates, the 647 has amplifiers for both the vertical and horizontal signals in the mainframe.
-where the plug-ins directly drive the CRT deflection plates,
+In addition to supporting the higher bandwidth, the amplifiers provide a normalized gain at the plug-in interface, eliminating the need to adjust the gain or sweep cal every time a plug-in was swapped.
-the 647 has amplifiers for both the vertical
-and horizontal signals in the mainframe.
-In addition to supporting the higher bandwidth,
-the amplifiers provide a normalized gain at the plug-in interface,
-eliminating the need to adjust the gain or
-sweep cal every time a plug-in was swapped.
-The 647 has a 140 ns [[delay line]] between the vertical plug-in
+The 647 has a 140 ns [[delay line]] between the vertical plug-in connector and the input of the vertical amplifier.
-connector and the input of the vertical amplifier.
+The interface between the vertical plug-in and the mainframe is a 93 Ω controlled-impedance connection.
-The interface between the vertical plug-in and the mainframe
+This is in contrast to the [[500-series scopes]], which appear to the plug-in as a high impedance.
-is a 93 Ω controlled-impedance connection.
-This is in contrast to the [[500-series scopes]],
-which appear to the plug-in as a high impedance.
 The horizontal and vertical plug-ins are not electrically interchangeable.
-Only a 10 series plug-in will work in the vertical compartment,
+Only a 10 series plug-in will work in the vertical compartment, and only a 11 series time base will work in the horizontal compartment.
-and only a 11 series time base will work in the horizontal compartment.
 X-Y mode requires the use of the external horizontal input in an 11 series time base.
-The 647 uses the [[T6470]] CRT with electromagnetic [[trace rotation]] and
+The 647 uses the [[T6470]] CRT with electromagnetic [[trace rotation]] and 14 kV total accelerating voltage.
- kV total accelerating voltage.
+The HV power supply contains five [[5642]] rectifier tubes: three for the +11.2 kV CRT anode supply, one for the -2.2 kV CRT cathode, and one for the -2.2 kV CRT grid/blanking.
-The HV power supply contains five [[5642]] rectifier tubes:
-three for the +11.2 kV CRT anode supply, one for the -2.2 kV CRT cathode,
-and one for the -2.2 kV CRT grid/blanking.
-The calibrator in the 647 is based on a 4 kHz crystal,
+The calibrator in the 647 is based on a 4 kHz crystal, which is divided down to 1 kHz ±1 Hz.
-which is divided down to 1 kHz.
-Its specified tolerance is ±1 Hz.
 The solid extender for 647 plug-ins is the [[013-077]].
@@ Line 90: / Line 69: @@
 ===647===
 <gallery>
-Tek 647 10a1 11b2.jpg|647 with [[10A1]] and [[11B2]]
+Tek 647 10a1 11b2.jpg | 647 with [[10A1]] and [[11B2]]
-Tek 647 right.jpg|647 Right Side
+Tek 647 right.jpg     | 647 Right Side
-MOD165K.JPG  |647 with MOD165K
+MOD165K.JPG       | 647 with MOD165K
 </gallery>
@@ Line 126: / Line 105: @@
 ==Components==
 {{Parts|647}}
-{{Parts|647A}}
 {{Parts|RM647}}
 [[Category:Introduced in 1963]]
 [[Category:647 series scopes]]