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

Tektronix FG502
function generator
Tektronix FG502

Produced from 1974 to 1993

Manuals
(All manuals in PDF format unless noted otherwise)

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

Links

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
070-2088-00.pdf Book TM500 Series Rear Interface Data Book 1975
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

Pictures

Components

Some Parts Used in the FG502

Part Part Number(s) Class Description Used in
151-0261-00 151-0261-00 Discrete component dual PNP transistor AM501 AM502 CG5001 CG551AP FG501 FG502 FG503 OF150 OF151 OF152 OF235 OS261 RM502A R1140 R5030 R5031 R7912 067-0679-00 067-0807-00 1101 1140A 1141 1142 1350 145 1450 1480 1481 1482 1485 1501 1801 1900 1910 1980 213 26A1 26A2 2620 285 3A9 3A10 3S1 3S2 3S5 3S6 432 434 4501 454 4601 4602 4610 4612 4620 4632 4634 4701 475 492 492A 492AP 494 494P 496 496P 5A13N 5A20N 5A21N 5A22N 5A26 5L4N 502A 5030 5031 576 690SR 7A22 7A29 7B51 7B71 7J20 7L5 7S11 7S12 7912AD