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Tektronix FG502
function generator
Tektronix FG502

Produced from 1974 to 1993

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

The Tektronix FG502 is a function generator plug-in for the TM500 system.

It generates low distortion sine, square, triangle, positive and negative pulse, and ramp waveforms from 0.1 Hz to 11 MHz.

A squarewave trigger is available at the front panel. Variable DC offset is also provided.

Α voltage-controlled frequency (VCF) input controls the output frequency from an external voltage source. The output frequency can be swept above or below the selected frequency to maximum of 1000:1 depending on the polarity and amplitude of the VCF input and the selected output frequency.

An external gate input allows the generator to operate for the duration of an externally applied gating signal. This mode provides either a single cycle output, or a train of preselected waveforms, depending on the gating signal width and the generator frequency setting.

Key Specifications

Frequency 0.1 Hz to 11 MHz, resolution 10-4
Frequency stability ≤0.1% for 1 hour, ≤0.5% for 24 hours (ambient +25 °C ±5 °C)
Frequency accuracy <3% of full scale from 0.1 Hz to 1 MHz. <5% of full scale from 1 MHz to 10 MHz
Output Amplitude >10 Vp-p open circuit. >5 Vp-p into 50 Ω (@ 10 kHz)
Output Offset >±5 Vp-p open circuit. >±2.5 Vp-p into 50 Ω
Amplitude flatness Sine, ±1.5 dB ref. to 10 kHz; Square, triangle ±3 dB referenced to sine
Sine Distortion < 0.5% from 10 Hz to 50 kHz. Harmonics >30 dB down at all other frequencies
Triangle Symmetry and Linearity Within 1% from 0.1 Hz to 1.1 MHz, 3% from 1.1 MHz to 11 MHz
Risetime (Square/Pulse) <20 ns
VCF 10 V signal shifts frequency >1000:1
Ext. Gate 0 to >+2 V, not to exceed +15 V
Trigger Output >5 V open circuit, >2.5 V into 50 Ω
Functions Sine, Square, Triangle, + and − Ramp, + and − Pulse


Documents Referencing FG502

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
070-2088-01.pdf Book TM500 Series Rear Interface Data Book 1976

Rear Interface

  • Output: A28 (GND A27)
  • Trigger Output: B27 (GND B28)
  • Gate In: B24 (GND B25)
  • VCF In: B21 (GND B22)

Repair Issues



Some Parts Used in the FG502