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{{TM500 | mfg=Tektronix | type=FG504 | function=40 MHz function generator | class=function generator | image=Tek-fg504-front.jpg | introduced=1976 | discontinued=1993 |
{{TM500
manuals=
|mfg=Tektronix
* [http://w140.com/smb/FG504_SM.pdf Tektronix FG504 Manual (OCR, PDF)]
|type=FG504
* [http://w140.com/tekscope_1976vol8no2_fg504.pdf FG504 Article in 1976 Volume 8 Number 2 Tekscope (PDF)]
|function=40 MHz function generator
|class=function generator
|image=Tek FG504 front 1.jpg
|introduced=1976
|discontinued=1993
||manuals=
* [[Media:070-2028-01.pdf|FG504 Instruction Manual (1977)]]
* [[Media:070-2655-00.pdf|FG504 Instruction Manual (SN B0400000+)]] (OCR)
}}
}}
{{BeginSpecs}}
{{Spec | Frequency range  | Sine, Triangle and Square – 0.001 Hz to 40 MHz; Ramps, Pulses or asymmetric waveforms – 0.001 Hz to 4 MHz }}
{{Spec | Duty cycle        | 7% to 93% }}
{{Spec | Output amplitude  | 30 V<sub>p-p</sub> (OC), 15 V<sub>p-p</sub> (50 Ω) }}
{{Spec | Output attenuator | 0 to 50 dB in 10 dB steps }}
{{Spec | DC offset        | ±7.5 V (OC), ±3.75 V (50 Ω) }}
{{Spec | Distortion        | ≤ 0.5% from 20 Hz to 40 kHz }}
{{Spec | Rise/fall time    | 6 ns (fixed), 10 ns to 100 ms in 7 steps + variable control }}
{{Spec | Sweep            | 1000:1 (500:1 on 10<sup>6</sup> mult.) }}
{{Spec | AM input          | 10 V<sub>p-p</sub> for 100% }}
{{EndSpecs}}


==Specifications==
==Links==
* [[Media:Tek fg5010 fg507 fg504 description.pdf|Tek FG5010 FG507 FG504 Description]]
{{Documents|Link=FG504}}


* Frequency range: Sine, Triangle and Square - 0.001 Hz to 40 MHz, Ramps, Pulses or asymmetric waveforms - 0.001 Hz to 4 MHz
==Rear Interface==
* Duty Cycle: 7% to 93%
<small>
* Output Amplitude: 30 V<sub>p-p</sub> (OC), 15 V<sub>p-p</sub> (50 Ω)
'''Right (as seen from the front, main board)'''
* Output Attenuator: 0 to 50 dB in 10 dB steps
{| class="wikitable"
* Offset: ±7.5 V (OC), ±3.75 V (50 Ω)
|-
* Distortion: ≤ 0.5% from 20 Hz to 40 kHz
! Pin
* Rise/Fall Time: 6 ns (fixed), 10 ns to 100 ms in 7 steps + variable control
! Signal
* Sweep: 1000:1 (500:1 on 10<sup>6</sup> mult.)
|-
* AM input: 10 V<sub>p-p</sub> for 100%
| 28A      || Output (via 30 kΩ)
|-
| 27A      || Output Common
|}
'''Left (mechanically floating interface board)'''
{| class="wikitable"
|-
! 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''
|-
| colspan="4" | <hr />
|-
| 23B      || ''nc''                    || 23A  || AM Input
|-
| 22B      || VCF Input Common          || 22A  || Sweep Trigger Input
|-
| 21B      || VCF Input                || 21A  || ''nc''
|-
|}
</small>


==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 V<sub>AC</sub> windings, 17.5 V<sub>AC</sub>, 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==
==Pictures==
'''External'''
<gallery>
Tek FG504 front 1.jpg          | FG504 front panel
Tek fg504 1.jpg                |
Tek fg504 2.png                |
Tek fg504 3.png                |
Tek-fg504-front.jpg            | FG504 front panel
fg504-1.jpg                    | FG504 in mainframe
Tek fg 504 95.jpg              |
Tek fg 504 96.jpg              |
Tek fg 504 97.jpg              |
Tek fg 504 98.jpg              |
Tek fg504 and ps503a.jpg        | FG504 and [[PS503A]] in [[TM504]]
Tek fg 504 in tm502a front.jpg  | FG504 in [[TM502A]]
Tek fg 504 in tm502a top.jpg    | FG504 in [[TM502A]]
</gallery>
'''Internal'''
<gallery>
Tek FG504 left.jpg              | FG504 left internal
Tek FG504 right.jpg            | FG504 right internal
fg504-2.jpg                    | FG504 without covers
fg504-3.jpg                    | Main board - output amplifier, attenuator, rise/fall time switch
fg504-4.jpg                    | Detail of output amplifier.  Trimmer capacitors for high frequency compensation.
fg504-5.jpg                    | 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.
fg504-6.jpg                    | Ceramic 10 dB divider lifted to show resistor network.  Laser trimming marks can be seen.
fg504-7.jpg                    | Function generator board that synthesizes the triangle and sine out of a square wave
fg504-8.jpg                    | Timer board
fg504-9.jpg                    | Circuit detail
Tek fg504 left internal.jpg    | FG504 left internal
Tek fg504 left internal u.jpg  | FG504 left internal upside down
Tek fg504 right internal_u.jpg  | FG504 right internal upside down
Tek fg504 right internal.jpg    | FG504 right internal
Tek fg504 rear.jpg              |
Tek fg504 rear2.jpg            |
</gallery>


'''Operation'''
<gallery>
<gallery>
Tek-fg504-front.jpg | FG504 front panel
Tek fg504 sine out.jpg         | Sine out
fg504-1.jpg | FG504 in mainframe
Tek fg504 square out.jpg       | Square out
fg504-2.jpg | FG504 without covers
Tek fg504 triag out.jpg         | Triangle out
fg504-3.jpg | Main board - output amplifier, attenuator, rise/fall time switch
fg504-4.jpg | Detail of output amplifier.  Trimmer capacitors for high frequency compensation.
fg504-5.jpg | 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.
fg504-6.jpg | Ceramic 10 dB divider lifted to show resistor network.  Laser trimming marks can be seen.
fg504-7.jpg | Function generator board that synthesizes the triangle and sine out of a square wave
fg504-8.jpg | Timer board
fg504-9.jpg | Circuit detail
</gallery>
</gallery>
'''Schematics and Locations'''
<gallery>
FG504_A1_Main_Board_Test_Point_Locations.png    | A1 Main Board Test Point Locations
FG504_A2_Function_Board_Test_Point_Locations.png | A2 Function Board Test Point Locations
FG504_A3_Loop_Board_Test_Point_Locations.png    | FG504 A3 Loop Board Test Point Locations
</gallery>
==Components==
{{Parts|FG504}}
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/23166...91207"