1650-A: Difference between revisions

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The '''General Radio 1650A''' is a portable impedance bridge introduced in 1959.  It was succeeded by the [[1650-B]] in 1968.  
{{GR Product
|model=1650-A
|codes=BATON,1650-9701,1650-9540,1650-9570
|class=impedance measurement
|summary=Portable impedance bridge
|image=Gr 1650-a 1.jpeg
|caption=Genrad 1650-A Bridge
|series=
|introduced=1959
|discontinued=1967
|designers=Henry P. Hall
|manuals=
* [[Media:GR 1650-A Impedance Bridge Manual (1964).pdf|General Radio 1650-A Impedance Bridge Manual, 1964 version]] (OCRed)
* [[Media:GR 1650-A Impedance Bridge Manual (1960).pdf|General Radio 1650-A Impedance Bridge Manual, 1960 version]] (OCRed)
{{Catalog History}}
}}
The {{Title|General Radio 1650-A}} is a portable impedance bridge introduced in {{Catalog P}}.  It was succeeded by the [[1650-B]] in {{Catalog T}}.
 
The 1650 was the first GR impedance bridge to feature the "Orthonull" function, which is a mechanical link driving the DQ dial from the CRL dial through a friction clutch.  (Conversely, turning the DQ dial will ''not'' turn the CRL dial.)
It helps avoid the "sliding null" problem when measuring components with high losses.


The 1650 has an "Orthonull" feature, which is a mechanical link driving the DQ dial from the CRL dials through a friction clutch. 
The [[1650-P1|1650-P1 Test Jig]] accessory was designed for the 1650-A.
It helps avoid the "sliding null" insenswhen measuring components with high losses, the Orthonull feature locks the DQ dial to the CRL dial with a friction clutch. If properly adjusted, turning the CRL dial will also turn the DQ dial. But, turning the DQ dial will not turn the CRL dial. The manual describes the feature in detail, but because I didn't grasp it at first, I'll say it again. Using Orthonull, the DQ dial turns by itself in the usual fashion. The CRL dial will also drive the DQ dial at the same time. Balance the bridge in the usual way for the deepest null. Friction will be a bit higher, but the sliding null problem will be entirely avoided, thanks to Henry's very clever invention.


==Specifications==
==Key Specifications==
* Capacitance: 1 pF to 1100 μF in 7 ranges.
* Capacitance: 1 pF to 1100 μF in 7 ranges
* Inductance: 1 μH to 1100 H in 7 ranges
* Inductance: 1 μH to 1100 H in 7 ranges
* Resistance: 1 mΩ milliohm to 11 MΩ in 8 ranges
* Resistance: 1 mΩ to 11 MΩ in 8 ranges, AC or DC
* D: (series capacitance) 0.001 to 1 at 1 kHz, (parallel capacitance) 0.1 to 50 at 1 kHz
* D (of series capacitance): 0.001 to 1 at 1 kHz, (parallel capacitance) 0.1 to 50 at 1 kHz
* Q: (series inductance) 0.02 to 10 at 1 kHz, (parallel inductance) 1 to 1000 at 1 kHz
* Q (of series inductance): 0.02 to 10 at 1 kHz, (parallel inductance) 1 to 1000 at 1 kHz
* Basic accuracy: ±1% of full scale, ±5% for dissipation factor
* Basic accuracy: ±1% of full scale, ±5% for dissipation factor
* Internal oscillator: 1 kHz ±2%
* Internal oscillator: 1 kHz ±2%
* Frequency range: 20 Hz to 20 kHz (to 100 kHz with reduced accuracy)
* Frequency range: 20 Hz to 20 kHz (to 100 kHz with reduced accuracy)
 
* DC Supply: 6 V, max. 60 mA; Battery: Four D cells, current drain 10 mA (AC measurements)
==Manuals==
* External Oscillator and Detector: [[1210-C|Type 1210-C Unit R-C Oscillator]], [[1311-A|Type 1311-A Audio Oscillator]] and [[1232-A|Type 1232-A Tuned Amplifier and Null Detector]] are recommended for audio measurements at frequencies other than 1 kHz
* [[Media:GR 1650-A Impedance Bridge Manual (1964).pdf|General Radio 1650-A Impedance Bridge Manual, 1964 version]] (OCRed)
* DC Polarization: 600 V may be applied (from external source) for series capacitance measurements
* [[Media:GR 1650-A Impedance Bridge Manual (1960).pdf|General Radio 1650-A Impedance Bridge Manual, 1960 version]] (OCRed)
* Weight: 17 pounds (8 kg) net


==Links==
==Links==
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* [https://patents.google.com/patent/US2872639A/en US Patent 2872639, Henry P Hall, ''Electrical bridge and method'']. Filed Oct. 10, 1956; Granted Feb. 3, 1959 (describing the Orthonull feature)
* [https://patents.google.com/patent/US2872639A/en US Patent 2872639, Henry P Hall, ''Electrical bridge and method'']. Filed Oct. 10, 1956; Granted Feb. 3, 1959 (describing the Orthonull feature)
* [https://patents.google.com/patent/US2966257A/en US Patent 2966257, Henry C Littlejohn, ''Instrument carrying case'']. Filed Nov. 5, 1959; Granted Dec. 27, 1960
* [https://patents.google.com/patent/US2966257A/en US Patent 2966257, Henry C Littlejohn, ''Instrument carrying case'']. Filed Nov. 5, 1959; Granted Dec. 27, 1960
* [[Henry P. Hall]], ''A New Universal Impedance Bridge''. [https://archive.org/details/sim_general-radio-experimenter_1959-03_33_3 GENERAL RADIO EXPERIMENTER Volume 33, No. 3, March 1959], page 3.
* [[Henry P. Hall]], ''A New Universal Impedance Bridge''. [[Media:General Radio Experimenter Vol.33 No.3 March 1959.pdf|General Radio Experimenter Volume 33, No. 3, March 1959]], page 3.
* [[Henry P. Hall]], ''Orthonull - A Mechanical Device to Improve Bridge Balance Convergence''. [[Media:General Radio Experimenter Vol.33 No.4 April 1959.pdf|General Radio Experimenter Volume 33, No. 4, April 1959]], page 7.
* [https://www.ietlabs.com/pdf/application_notes/12-Henry%20Hall%20Digibridge%20Patent-Digibridge.pdf IET Labs Application Note, ''Henry Hall: Father of the Digibridge'']
* [https://www.ietlabs.com/pdf/application_notes/12-Henry%20Hall%20Digibridge%20Patent-Digibridge.pdf IET Labs Application Note, ''Henry Hall: Father of the Digibridge'']
===Videos===
* [https://www.youtube.com/watch?v=Id9wMgjEQ04 General Radio Genrad 1650 impedance bridge - Oscillator Circuit repair and calibration] @ YouTube
* [https://www.youtube.com/watch?v=VMFOWfUiLLw General Radio 1650-A Experimentation with Coils Capacitors and Tank circuits] @ YouTube
* [https://www.youtube.com/watch?v=96G_VjkvvnE Vacuum Tube Audio Transformer Impedance Determined With General Radio Impedance Bridge] @ YouTube


==Pictures==
==Pictures==
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</gallery>
</gallery>


'''Internal'''
===Internal===
<gallery>
<gallery>
GR 1650-A internal 1.jpg
GR 1650-A internal 1.jpg | Internal view. The red jack on the bottom left is an aftermarket modification on this unit for an external +6 V supply.
GR 1650-A internal 2.jpg
GR 1650-A internal 2.jpg
GR 1650-A internal 3.jpg
GR 1650-A internal 3.jpg
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[[Category:Impedance measurement]]
[[Category:Impedance measurement]]
[[Category:Introduced in 1959]]
[[Category:Introduced in 1959]]
__NOTOC__

Latest revision as of 16:35, 4 June 2024

General Radio 1650-A
Portable impedance bridge
Genrad 1650-A Bridge

Available from 1959 to 1967

Manuals
Catalog History
 Document Year Page
Catalog P 1959 24
Catalog Q 1961 22
Catalog R 1963 34
Catalog S 1965 50
(All manuals in PDF format unless noted otherwise)

The General Radio 1650-A is a portable impedance bridge introduced in Catalog P (1959). It was succeeded by the 1650-B in Catalog T (1968).

The 1650 was the first GR impedance bridge to feature the "Orthonull" function, which is a mechanical link driving the DQ dial from the CRL dial through a friction clutch. (Conversely, turning the DQ dial will not turn the CRL dial.) It helps avoid the "sliding null" problem when measuring components with high losses.

The 1650-P1 Test Jig accessory was designed for the 1650-A.

Key Specifications

  • Capacitance: 1 pF to 1100 μF in 7 ranges
  • Inductance: 1 μH to 1100 H in 7 ranges
  • Resistance: 1 mΩ to 11 MΩ in 8 ranges, AC or DC
  • D (of series capacitance): 0.001 to 1 at 1 kHz, (parallel capacitance) 0.1 to 50 at 1 kHz
  • Q (of series inductance): 0.02 to 10 at 1 kHz, (parallel inductance) 1 to 1000 at 1 kHz
  • Basic accuracy: ±1% of full scale, ±5% for dissipation factor
  • Internal oscillator: 1 kHz ±2%
  • Frequency range: 20 Hz to 20 kHz (to 100 kHz with reduced accuracy)
  • DC Supply: 6 V, max. 60 mA; Battery: Four D cells, current drain 10 mA (AC measurements)
  • External Oscillator and Detector: Type 1210-C Unit R-C Oscillator, Type 1311-A Audio Oscillator and Type 1232-A Tuned Amplifier and Null Detector are recommended for audio measurements at frequencies other than 1 kHz
  • DC Polarization: 600 V may be applied (from external source) for series capacitance measurements
  • Weight: 17 pounds (8 kg) net

Links

Videos

Pictures

Internal

  • Internal view. The red jack on the bottom left is an aftermarket modification on this unit for an external +6 V supply.

    Internal view. The red jack on the bottom left is an aftermarket modification on this unit for an external +6 V supply.


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