FG504

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Tektronix FG504
40 MHz function generator
Tektronix FG504

Produced from 1976 to 1993

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

The Tektronix FG504 is a 40 MHz function generator plug-in for the TM500 system.

Key Specifications

Frequency range Sine, Triangle and Square – 0.001 Hz to 40 MHz; Ramps, Pulses or asymmetric waveforms – 0.001 Hz to 4 MHz
Duty cycle 7% to 93%
Output amplitude 30 Vp-p (OC), 15 Vp-p (50 Ω)
Output attenuator 0 to 50 dB in 10 dB steps
DC offset ±7.5 V (OC), ±3.75 V (50 Ω)
Distortion ≤ 0.5% from 20 Hz to 40 kHz
Rise/fall time 6 ns (fixed), 10 ns to 100 ms in 7 steps + variable control
Sweep 1000:1 (500:1 on 106 mult.)
AM input 10 Vp-p for 100%

Links

Documents Referencing FG504

Document Class Title Authors Year Links
070-2088-01.pdf Book TM500 Series Rear Interface Data Book 1976 AF501 • AM501 • AM502 • AM511 • DC501 • DC502 • DC503 • DC504 • DC505 • DC505A • DD501 • DM501 • DM502 • FG501 • FG502 • FG503 • FG504 • LA501 • MR501 • PG501 • PG502 • PG505 • PG506 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • RG501 • SC501 • SC502 • SG502 • SG503 • SG504 • SW503 • TG501 • TR501 • TR502
Tekscope 1976 V8 N1.pdf Article New Products 1976 FG504 • SG504 • LabCart Model 3 • SW503 • C-5A
Tekscope 1976 V8 N2.pdf Article The FG504 - A New Standard in Function Generators Ira Pollock 1976 FG504
Tekscope 1977 V9 N2.pdf Article Measuring Harmonic Distortion with a Spectrum Analyzer Ken Matheson 1977 FG504 • 7L5 • 5L4N
Tekscope 1978 V10 N2.pdf Article Pulse Generator or Function Generator - Making an Intelligent Choice Bill Rasnake 1978 FG504 • PG508

Rear Interface

Right (as seen from the front, main board)

Pin Signal
28A Output (via 30 kΩ)
27A Output Common

Left (mechanically floating interface board)

Pin Signal Pin Signal
28B Trig Output Common 27A nc
27B Trig Output 27A GND
26B Phase Lock Error Voltage 26A Sweep Reset Output
25B Trig/Gate Common 25A Linear Sweep Output
24B Trig/Gate Input 24A nc
23B nc 23A AM Input
22B VCF Input Common 22A Sweep Trigger Input
21B VCF Input 21A nc

Internals

The FG504 takes +/– 33 V from the right slot to create a +/– 15 V supply, and the + 11.5 V for a +5 V supply. It uses the 25 VAC windings, 17.5 VAC, and + 11.5 V on the left slot for a +/– 25 V supply to the output amplifier. The regulators incorporate the mainframe pass transistors on both slots.

U770 is a 155-0032-00 below S/N B057720, a 155-0217-00 from B057720 on.

Pictures

External

Internal

  • FG504 left internal

    FG504 left internal

  • FG504 right internal

    FG504 right internal

  • FG504 without covers

    FG504 without covers

  • Main board - output amplifier, attenuator, rise/fall time switch

    Main board - output amplifier, attenuator, rise/fall time switch

  • Detail of output amplifier. Trimmer capacitors for high frequency compensation.

    Detail of output amplifier. Trimmer capacitors for high frequency compensation.

  • Detail of 50 Ω attenuator. Divider networks (under the ceramic chips) are switched in or bypassed by cam switches. The 0.3 A output fuse can also be seen.

    Detail of 50 Ω attenuator. Divider networks (under the ceramic chips) are switched in or bypassed by cam switches. The 0.3 A output fuse can also be seen.

  • Ceramic 10 dB divider lifted to show resistor network. Laser trimming marks can be seen.

    Ceramic 10 dB divider lifted to show resistor network. Laser trimming marks can be seen.

  • Function generator board that synthesizes the triangle and sine out of a square wave

    Function generator board that synthesizes the triangle and sine out of a square wave

  • Timer board

    Timer board

  • Circuit detail

    Circuit detail

  • FG504 left internal

    FG504 left internal

  • FG504 left internal upside down

    FG504 left internal upside down

  • FG504 right internal upside down

    FG504 right internal upside down

  • FG504 right internal

    FG504 right internal

Operation

  • Sine out

    Sine out

  • Square out

    Square out

  • Triangle out

    Triangle out

Schematics and Locations

  • A1 Main Board Test Point Locations

    A1 Main Board Test Point Locations

  • A2 Function Board Test Point Locations

    A2 Function Board Test Point Locations

  • FG504 A3 Loop Board Test Point Locations

    FG504 A3 Loop Board Test Point Locations

Components

Some Parts Used in the FG504

Part Part Number(s) Class Description Used in
155-0032-00 155-0032-00 • 155-0032-01 Monolithic integrated circuit variable-gain transconductance amplifier 335 • 464 • 465 • 465B • 466 • 475 • 475A • 475M • 634 • 650 • 651 • 652 • 653 • 655 • 656 • 670 • 671 • 7A12 • 475 • FG504 • 1440 • 1460 • 1480 • 1481 • 1482 • 1485
155-0217-00 155-0216-00 • 155-0217-00 Monolithic integrated circuit variable-gain transconductance amplifier 335 • 475 • 7D20 • FG504
CA3046 156-0048-00 Monolithic integrated circuit transistor array 7104 • 7403N • 7503 • 7B53A • 7D12 • DM502 • FG504 • S-52 • Telequipment D34 • 7603 • 7613 • 7623 • 7633
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