FG502: Difference between revisions

Latest revision as of 03:32, 6 October 2024

Tektronix FG502
function generator Tektronix FG502 Produced from 1974 to 1993 Manuals Tektronix FG502 Manual -00 Tektronix FG502 Manual -01 (OCR) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

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

It generates low distortion sine, square, triangle, positive and negative pulse, and ramp waveforms from 0.1 Hz to 11 MHz.

The FG502 was designed by Steve Stanger.

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 (Sine, Square, Triangle), 0.01 Hz to 1.1 MHz (Ramp, Pulse), resolution 10^-4
Frequency stability	≤0.1% for 1 hour, ≤0.5% for 24 hours (ambient +25±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 V_p-p open circuit. ≥5 V_p-p into 50 Ω (@ 10 kHz)
Output Offset	≥±5 V_p-p open circuit. ≥±2.5 V_p-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	≤20 ns (square/pulse)
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 (50%), Triangle, + and − Ramp, + and − Pulse (5/95%)

Links

Tektronix FG 502 Resurrection and Repair by Zenwizard Studios @ YouTube

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	TM500 system • TM501 • TM503 • FG501 • FG502 • RG501 • PG501 • SG502 • DC501 • DC502 • PS501 • PS502 • PS503
070-2088-00.pdf	Book	TM500 Series Rear Interface Data Book		1975	AF501 • AM501 • AM502 • DC501 • DC502 • DC503 • DC504 • DC505 • DC505A • DM501 • DM502 • FG501 • FG502 • FG503 • MR501 • PG501 • PG502 • PG505 • PG506 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • RG501 • SC501 • SC502 • SG502 • SG503 • TG501
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
070-2088-04.pdf	Book	TM500 Series Rear Interface Data Book		1985	AA501 • AF501 • AM501 • AM502 • AM503 • AM511 • DC501 • DC502 • DC503 • DC503A • DC504 • DC505 • DC505A • DC508 • DC508A • DC509 • DC510 • DC5009 • DC5010 • DD501 • DL502 • DM501 • DM501A • DM502 • DM502A • DM505 • DM5010 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • FG5010 • LA501 • LA501W • WR501 • MR501 • PG501 • PG502 • PG505 • PG506 • PG507 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • PS5010 • RG501 • SC501 • SC502 • SC503 • SC504 • SG502 • SG503 • SG504 • SG505 • SW503 • TG501 • TR501 • TR502 • MI5010 • MX5010 • SI5010

Patents that may apply to FG502

Page	Title	Inventors	Filing date	Grant date	Links
Patent US 3562464A	Cam actuated switch having movable and fixed contacts on circuit board	Howard Vollum • Willem H Verhoef • Tony Sprando	1968-10-07	1971-02-09	Cam switches • 2101 • 2701 • 2703 • 432 • 434 • 465 • 475 • 5A15N • 5A18N • 5A20N • 5A21N • 5A38 • 5A45 • 5B10N • 5B12N • 7A15 • 7A16A • 7A18 • 7A19 • 7A24 • 7A26 • 7B10 • 7B15 • 7B50 • 7B51 • 7B52 • 7B53A • 7B50A • 7B70 • 7B71 • 7B80 • 7B85 • 7B87 • 7B92 • 7B92A • 7D01 • 7D12 • 7D15 • 7J20 • 7S12 • 7T11 • 7T11A • AF501 • AM502 • AM503 • DC502 • DC503 • DC504 • DC505 • DM501 • DM502 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • PG501 • PG502 • PG505 • PG506 • PG506A • PG508 • TG501 • SC502 • SC503 • SC504

Rear Interface

Output: A28 (GND A27)
Trigger Output: B27 (GND B28)
Gate In: B24 (GND B25)
VCF In: B21 (GND B22)

Repair Issues

See the FG502 Repairs Page

Pictures

right internal view
left internal view
rear view
front plate

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

@@ Line 1: / Line 1: @@
-{{TM500 | mfg=Tektronix | type=FG502 | function=function generator | class=function generator | image=Tek_fg502_2.jpg | introduced=1974 | discontinued=1993 |
+{{TM500 | mfg=Tektronix | type=FG502 | function=function generator | class=function generator | image=Tek_fg502_2.jpg | introduced=1974 | discontinued=1993 | designers=Steve Stanger
-designers= |manuals=
+|manuals=
-* [http://w140.com/smb/FG502_SM.pdf Tektronix FG502 Manual (OCR, PDF)]
+* [[Media:070-1706-00.pdf|Tektronix FG502 Manual -00]]
+* [[Media:070-1706-01.pdf|Tektronix FG502 Manual -01]] (OCR)
 }}
-It generates low distortion sine, square, triangle, positive and negative pulse, and ramp waveforms
+It generates low distortion sine, square, triangle, positive and negative pulse, and ramp waveforms from 0.1 Hz to 11 MHz.
-from 0.1 Hz to 11 MHz.
+The FG502 was designed by [[Steve Stanger]].
 A squarewave trigger is available at the front panel. Variable DC offset is also provided.
@@ Line 17: / Line 19: @@
 {{BeginSpecs}}
-{{Spec| Frequency | 0.1 Hz to 11 MHz, resolution 10<sup>-4</sup> }}
+{{Spec| Frequency | 0.1 Hz to 11 MHz (Sine, Square, Triangle), 0.01 Hz to 1.1 MHz (Ramp, Pulse), resolution 10<sup>-4</sup> }}
-{{Spec| Frequency stability | ≤0.1% for 1 hour, ≤0.5% for 24 hours (ambient +25 °C ±5 °C)  }}
+{{Spec| Frequency stability | ≤0.1% for 1 hour, ≤0.5% for 24 hours (ambient +25±5°C)  }}
-{{Spec| Frequency accuracy | <3% of full scale from 0.1 Hz to 1 MHz. <5% of full scale from 1 MHz to 10 MHz}}
+{{Spec| Frequency accuracy | ≤3% of full scale from 0.1 Hz to 1 MHz. ≤5% of full scale from 1 MHz to 10 MHz}}
-{{Spec| Output Amplitude | >10 V<sub>p-p</sub> open circuit. >5 V<sub>p-p</sub> into 50 Ω (@ 10 kHz)}}
+{{Spec| Output Amplitude | ≥10 V<sub>p-p</sub> open circuit. ≥5 V<sub>p-p</sub> into 50 Ω (@ 10 kHz)}}
-{{Spec| Output Offset | >±5 V<sub>p-p</sub> open circuit. >±2.5 V<sub>p-p</sub> into 50 Ω }}
+{{Spec| Output Offset | ≥±5 V<sub>p-p</sub> open circuit. ≥±2.5 V<sub>p-p</sub> into 50 Ω }}
 {{Spec| Amplitude flatness | Sine, ±1.5 dB ref. to 10 kHz; Square, triangle ±3 dB referenced to sine }}
-{{Spec| Sine Distortion | < 0.5% from 10 Hz to 50 kHz. Harmonics >30 dB down at all other frequencies }}
+{{Spec| Sine Distortion | ≤0.5% from 10 Hz to 50 kHz. Harmonics ≥30 dB down at all other frequencies }}
 {{Spec| Triangle Symmetry and Linearity | Within 1% from 0.1 Hz to 1.1 MHz, 3% from 1.1 MHz to 11 MHz }}
-{{Spec| Risetime (Square/Pulse) | <20 ns }}
+{{Spec| Risetime | ≤20 ns (square/pulse) }}
-{{Spec| VCF | 10 V signal shifts frequency >1000:1  }}
+{{Spec| VCF | 10 V signal shifts frequency ≥1000:1  }}
-{{Spec| Ext. Gate | 0 to >+2 V, not to exceed +15 V }}
+{{Spec| Ext. Gate | 0 to ≥+2 V, not to exceed +15 V }}
-{{Spec| Trigger Output | >5 V open circuit, >2.5 V into 50 Ω }}
+{{Spec| Trigger Output | ≥5 V open circuit, ≥2.5 V into 50 Ω }}
-{{Spec| Functions | Sine, Square, Triangle, + and − Ramp, + and − Pulse
+{{Spec| Functions | Sine, Square (50%), Triangle, + and − Ramp, + and − Pulse (5/95%) }}
-}}
 {{EndSpecs}}
+==Links==
+* [https://www.youtube.com/watch?v=SrDK0X9ye2U Tektronix FG 502 Resurrection and Repair] by Zenwizard Studios @ YouTube
+{{Documents|Link=FG502}}
+{{PatentLinks|FG502}}
 ==Rear Interface==
@@ Line 40: / Line 46: @@
 == Repair Issues==
-* Helitrim potentiometers are prone to failure due to cracking plastic axle.
+* See the [[FG502/Repairs|FG502 Repairs Page]]
-* (Tantalum) Electolytic capacitors, especially on the output transistors.
-* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_500/Reparatur%20Tektronix%20FG502-1-com.pdf FG502 repair report @ amplifier.cd] (German)
-* [https://www.electronicdesign.com/technologies/test-measurement/article/21137778/the-tektronix-function-generator-teardown The Tektronix Function Generator Teardown] - Paul Rako @ electronicdesign.com
-* For serial numbers below B050740, some FG502's may not shift Output Frequency 1000:1 with 10 V or less as specified. To correct this problem, change R125 from 10 kΩ to 9.41 kΩ.
 ==Pictures==
@@ Line 61: / Line 63: @@
 TEK-FG502-Frontplate.JPG| front plate
 </gallery>
+==Components==
+{{Parts|FG502}}