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 |
|---|---|
| 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
FG504 front panel
FG504 in mainframe
FG504 without covers
Main board - output amplifier, attenuator, rise/fall time switch
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 amp output fuse can also 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
Timer board
Circuit detail
FG504 left internal
FG504 left internal upside down
FG504 right internal upside down
FG504 right internal
FG504 in TM502A
FG504 in TM502A
FG504 in TM502A
Sine out
Square out
Triangle out
A1 Main Board Test Point Locations
A2 Function Board Test Point Locations
FG504 A3 Loop Board Test Point Locations
Custom ICs used in the FG504
| Page | Class | Manufacturer | Model | Part nos | Description | Designers | Used in |
|---|---|---|---|---|---|---|---|
| 155-0032-00 | Monolithic integrated circuit | Tektronix | M55 | 155-0032-00 • 155-0032-01 | variable-gain transconductance amplifier | Roy Hayes • Einar Traa | 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 | Monolithic integrated circuit | Tektronix | M55D | 155-0216-00 • 155-0217-00 | variable-gain transconductance amplifier | Roy Hayes • Einar Traa | 335 • 475 • 7D20 • FG504 |