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Tektronix RG501
ramp generator
Tektronix RG501

Produced from 1972 to 1982

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix RG501 is a ramp generator plug-in for the TM500 system.

It produces a linear ramp signal adjustable up to 10 V amplitude, positive or negative, with a duration from 10 μs to 10 s (equivalent to 1 μs/Div to 1 s/Div on a typical oscilloscope's X scale). Additionally, the RG501 provides a 3 V (TTL compatible) gate signal (high while ramp running).

The ramp can be triggered from an external input, an internal trigger signal (via the backplane), the line frequency, or can be free-running (Auto Trig mode).

A typical application of the RG501 is to sweep a voltage-controlled function generator's frequency, e.g. when used with with the FG501.

Key Specifications

Ramp duration Fixed, 10 μs to 1 s in decade steps, variable multiplier ×1 to (min.) ×10 (i.e. max. 10 s)
Amplitude variable from ~50 mV to 10 V, selectable polarity
Trigger Sensitivity 200 mVp-p, Level ±1 V, input impedance 10 kΩ
Gate output 3 V, 160 Ω source impedance


Documents Referencing RG501

Document Class Title Authors Year Links
Tekscope 1972 V4 N3 May 1972.pdf Article TM500 series - A New Dimension in Plug-in Instrumentation Bob Ragsdale 1972
070-2088-00.pdf Book TM500 Series Rear Interface Data Book 1975
070-2088-01.pdf Book TM500 Series Rear Interface Data Book 1976

Rear Interface

Connector Pin Signal
28A Ramp output (common on 27A)
25A Gate output (common on 26A)
24B Internal trigger input (common on 25B)
22B Auxiliary ground


The RG501 uses Tek custom ICs 155-0056-00 (sweep control) and 155-0042-03 (Miller integrator).

Service Notes

If Line Trigger is OK but the power supplies load down in other trigger modes, suspect Q15 is installed incorrectly because of different case styles.


Year 1975
Catalog Price $175
In 2023 Dollars $1,000



Some Parts Used in the RG501

Part Part Number(s) Class Description Used in
155-0028-00 155-0028-00 155-0028-01 155-0042-00 155-0042-01 155-0042-02 155-0042-03 Monolithic integrated circuit Miller integrator and delay pickoff 5030 R5030 5031 R5031 1401 1401A 1480 1481 1482 1485 26G1 26G2 26G3 314 335 432 434 4701 5B10N 5B12N 5B31 5B40 5B42 5S14N 7B52 7B53A 7B53N 7L12 7L13 7L14 7L18 7S14 AN/USM-281C RG501 Telequipment D63 Telequipment DM63
155-0056-00 155-0056-00 155-0056-01 Monolithic integrated circuit sweep control 26G1 26G2 26G3 314 4701 5B10N 5B12N 5S14N 7L5 7L12 7L13 7L14 7L18 7S14 5S14N RG501 Telequipment D63 Telequipment DM63