FG504
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 |
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| 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
- Tekscope Vol. 8 No. 2, 1976, p.12+: Ira Pollock, The FG504 - a new standard in function generators
- Tek FG5010 FG507 FG504 Description (PDF)
Pictures
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FG504 front panel
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FG504 in mainframe
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FG504 without covers
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Main board - output amplifier, attenuator, rise/fall time switch
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Detail of output amplifier. Trimmer capacitors for high frequency compensation.
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Detail of 50 Ω attenuator. Divider networks (under the ceramic chips) are switched in or bypassed by cam switches. The 0.3 amp output fuse can also be seen.
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Ceramic 10 dB divider lifted to show resistor network. Laser trimming marks can be seen.
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Function generator board that synthesizes the triangle and sine out of a square wave
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Timer board
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Circuit detail
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FG504 left internal
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FG504 left internal upside down
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FG504 right internal upside down
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FG504 right internal
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FG504 in TM502A
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FG504 in TM502A
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FG504 in TM502A
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Sine out
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Square out
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Triangle out
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A1 Main Board Test Point Locations
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A2 Function Board Test Point Locations
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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 (voltage in, current out) | 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 | 4601 • 7104 • 7403N • 7503 • 7B53A • 7D12 • DM502 • FG504 • S-52 • Telequipment D34 • 7603 • 7613 • 7623 • 7633 • FG507 • Keithley 227 |