7B90P: Difference between revisions

Revision as of 16:30, 16 November 2021

Tektronix 7B90
400 MHz Programmable Timebase Tektronix 7B90P front Compatible with 7000-series scopes Produced from 1978 to 1989 Manuals 7B90P Instruction Manual (OCR, PDF) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 7B90P is a digitally programmable 400 MHz time-base plug-in for the digitizing mainframes of the 7000 series. All controls are programmable except for the sweep calibration screwdriver adjustment and the external trigger input terminator switch. The local/remote state of the 7B90P is slaved to the local/remote state of the mainframe.

Key Specifications

Sweep	10 ns/Div to 500 ms/Div (1-2-5), ×10 magnifier (down to 500 ps/Div), no variable sweep, adjustable and programmable holdoff
Excluded sweep	First 10 ns in 79XX programmable mainframes
Trigger Sensitivity	PP Auto Mode AC or DC: 125 mV or 0.5 Div up to 50 MHz, 375 mV or 1.5 Div up to 400 MHz Norm or Single Sweep AC: 100 mV or 0.3 Div up to 50 MHz, 250 mV or 1.5 Div up to 400 MHz
Jitter	<100 ps at 400 MHz
Ext. Trigger	1 MΩ: 20 pF, max. 250 V DC+peak AC; 50 Ω: max. 1 W
Sweep/Trigger Modes	Peak-Peak Auto, Auto, Norm, Single Sweep

Internals

The 7B90P is controlled by a Motorola 6800 microprocessor.

Pictures

Front
Front
Right
Right
Left
A late version of the 7B90P with connectors for the 021-0374-00 GPIB decoder
Connectors for the 021-0374-00 GPIB decoder on a late 7B90P

Custom ICs used in the 7B90P

Page	Model	Part nos	Description	Designers	Used in
155-0049-00	M079G	155-0049-00 • 155-0049-01 • 155-0049-02	sweep control with lockout	Bill DeVey	335 • 464 • 465 • 466 • 475 • 475A • 475M • 485 • 5B31 • 5B40 • 5B52 • 5B42 • 5B44 • 7B53A • 7B80 • 7B85 • 7B87 • 7B92A • 7B90P • 7B10 • 7B15 • SC502 • 7B42N • AN/USM-281C • 067-0657-00
155-0109-00	M120B	155-0109-00 • 155-0109-01	trigger	Gary Vance	5B25N • 5B31 • 5B40 • 5B42 • 5B44 • 5S14N • 7B50A • 7B53A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P • 7S14 • 7612D • SC502 • SC503 • SC504
155-0126-00	M121	155-0126-00	trigger source selector and P-P auto amplifier	Art Metz	7B50A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P
155-0135-00	M171	155-0135-00	custom legend generator	Roger McCoy • Mike Metcalf	7A16P • 7B90P
155-0164-00	H526(?)	155-0164-00	time slot switch		7A16P • 7B90P • 7A29P

@@ Line 8: / Line 8: @@
 series=7000-series scopes|
 manuals=
-* [http://w140.com/smb/7b90p_sm.pdf Tektronix 7B90P (OCR, PDF)]
+* [[Media:070-2309-00.pdf|7B90P Instruction Manual]] (OCR, PDF)
 }}
 The '''Tektronix 7B90P''' is a digitally programmable 400 MHz time-base plug-in for the digitizing mainframes of the [[7000-series scopes|7000 series]].
-Except for the sweep calibration screwdriver adjustment and the external trigger input terminator switch all other controls are programmable.
+All controls are programmable except for the sweep calibration screwdriver adjustment and the external trigger input terminator switch.
 The local/remote state of the 7B90P is slaved to the local/remote state of the mainframe.
@@ Line 18: / Line 17: @@
 {{Spec | Sweep | 10 ns/Div to 500 ms/Div (1-2-5), ×10 magnifier (down to 500 ps/Div), no variable sweep, adjustable and programmable holdoff}}
 {{Spec | Excluded sweep | First 10 ns in 79XX programmable mainframes }}
-{{Spec | Trigger Sensitivity PP Auto Mode AC or DC | 125 mV or 0.5 Div up to 50 MHz, 375 mV or 1.5 Div up to 400 MHz}}
+{{Spec | Trigger Sensitivity |
-{{Spec | Trigger Sensitivity Norm or Single Sweep AC | 100 mV or 0.3 Div up to 50 MHz, 250 mV or 1.5 Div up to 400 MHz}}
+* PP Auto Mode AC or DC: 125 mV or 0.5 Div up to 50 MHz, 375 mV or 1.5 Div up to 400 MHz
+* Norm or Single Sweep AC: 100 mV or 0.3 Div up to 50 MHz, 250 mV or 1.5 Div up to 400 MHz
+}}
 {{Spec | Jitter | <100 ps at 400 MHz }}
-{{Spec | Ext. Trigger 1 MΩ // 20 pF| Max. 250 V DC+peak AC }}
+{{Spec | Ext. Trigger | 1 MΩ: 20 pF, max. 250 V DC+peak AC; 50 Ω: max. 1 W}}
-{{Spec | Ext. Trigger 50 Ω| Max. 1 W}}
 {{Spec | Sweep/Trigger Modes | Peak-Peak Auto, Auto, Norm, Single Sweep}}
 {{EndSpecs}}