1800-B: Difference between revisions
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{{GR Product | |||
|model=1800-B | |||
|codes=DUCAT | |||
|class=meters | |||
|summary=Vacuum-Tube Voltmeter | |||
|image=GR 1800-B Close-Up.jpg | |||
|caption=General Radio 1800-B Vacuum-Tube Voltmeter | |||
|series=1800 | |||
|introduced=1956 | |||
|discontinued=1961 | |||
|designers= | |||
|manuals= | |||
* '''Manual Needed''' | |||
* [[Media:GR 1800-A Vacuum-Tube Voltmeter 653-D.pdf|General Radio 1800-A Vacuum-Tube Voltmeter Manual 653-D]] | |||
{{Catalog History}} | |||
}} | |||
The {{Title|General Radio 1800-B Vacuum-Tube Voltmeter}} was introduced in {{Catalog O}} and remained available through {{Catalog Q}}. | |||
The Type 1800-B is a high impedance, high frequency voltmeter. Its an updated version of the [[1800-A]] Vacuum-Tube Voltmeter with improved power supply, including a two stage voltage regulator. Also updated with the new GR 874 probe adapter. | |||
On the AC voltage ranges, except for the two lowest, it is essentially a peak reading instrument, but the scales are calibrated to give readings of r-m-s values of sinusoidal applied voltages. The upper frequency limit approaches 500 Mhz with corrections, approximately 100 MHz without. For DC measurements binding posts are provided for DC only along with a shorting strip for the open grid mode. For AC measurements a hard-wired UHF probe is provided, stored in the top compartment along with it's accessories. When in the storage position the probe plugs into the front panel binding posts where low frequency AC measurements are made. When UHF measurements are desired the probe is removed for direct connection, the nose piece can be removed to reduce probe capacitance. Also located in the top compartment is a 50 Ω disk resistor used to convert the probe impedance along with adapters for GR Type 274 and Type 874 coaxial connectors. The 1800-B utilizes two RCA type 9005 "Acorn" UHF diodes, the data sheet is below. Two range | |||
extension accessories were available, the Types [[1800-P2]] High-Frequency Multiplier and [[1800-P3]] Low-Frequency Multiplier. | |||
==Specifications== | ==Specifications== | ||
* '''Voltage Range:''' 0.1 to 150 V AC in 6 ranges; .01 to 150 V DC in 6 ranges | |||
* '''Accuracy:''' DC and AC ±2% of full scale on 6 ranges; AC accuracy is for sinusoidal voltages | |||
* '''Input Impedance:''' at low frequencies AC input resistance 25 MΩ; higher frequencies see manual; DC input resistance is 10 MΩ or open grid, selectable | |||
==Links== | ==Links== | ||
* [[Media:GR Exp 1800-B 09_1956.pdf|Experimenter September 1956 describing Type 1800-B]] | |||
* [[Media:GR Exp 1800-P2 05_1948.pdf|Experimenter May 1948 describing Type 1800-P2]] | |||
* [[Media:GR 1800-P3 LF Multiplier 01_1954.pdf|General Radio 1800-P3 Low-Frequency Multiplier Data Sheet 700-C 1954]] | |||
* [[Media:GR Exp 1800-P3 12_1948.pdf|Experimenter December 1948 describing Type 1800-P3]] | |||
* [[Media:RCA 991 Voltage Regulator 12_1939.pdf|RCA 991 Voltage Regulator Data Sheet 1939]] | |||
* [[Media:RCA 9005 UHF Diode 12_1942.pdf|RCA 9005 UHF Diode Data Sheet 1942]] | |||
==Photos== | ==Photos== | ||
<gallery> | <gallery> | ||
GR 1800-B Front.jpg | |||
GR 1800-B Front A.jpg | |||
GR 1800-B Left.jpg | |||
GR 1800-B Rear.jpg | |||
GR 1800-B Right.jpg | |||
GR 1800-B Top.jpg | |||
GR 1800-B Top Open.jpg | |||
GR 1800-B Top Open A.jpg | |||
GR 1800-B Case Empty.jpg | |||
GR 1800-B Inside Left.jpg | |||
GR 1800-B Inside Left A.jpg | |||
GR 1800-B Inside Rear.jpg | |||
GR 1800-B Inside Right A.jpg | |||
GR 1800-B Inside Right.jpg | |||
GR 1800-B Inside Top.jpg | |||
GR 1800-B Inside Bottom.jpg | |||
GR 1800-B Inside Probe Storage A.jpg | |||
GR 1800-B Inside Probe Storage.jpg | |||
GR 1800-B Probe Break down.jpg | |||
GR 1800-B Probe Close-up.jpg | |||
</gallery> | </gallery> | ||
[[Category:Meters]] | [[Category:Meters]] | ||
Revision as of 07:35, 15 May 2024
The General Radio 1800-B Vacuum-Tube Voltmeter was introduced in Catalog O (1956) and remained available through Catalog Q (1961).
The Type 1800-B is a high impedance, high frequency voltmeter. Its an updated version of the 1800-A Vacuum-Tube Voltmeter with improved power supply, including a two stage voltage regulator. Also updated with the new GR 874 probe adapter. On the AC voltage ranges, except for the two lowest, it is essentially a peak reading instrument, but the scales are calibrated to give readings of r-m-s values of sinusoidal applied voltages. The upper frequency limit approaches 500 Mhz with corrections, approximately 100 MHz without. For DC measurements binding posts are provided for DC only along with a shorting strip for the open grid mode. For AC measurements a hard-wired UHF probe is provided, stored in the top compartment along with it's accessories. When in the storage position the probe plugs into the front panel binding posts where low frequency AC measurements are made. When UHF measurements are desired the probe is removed for direct connection, the nose piece can be removed to reduce probe capacitance. Also located in the top compartment is a 50 Ω disk resistor used to convert the probe impedance along with adapters for GR Type 274 and Type 874 coaxial connectors. The 1800-B utilizes two RCA type 9005 "Acorn" UHF diodes, the data sheet is below. Two range extension accessories were available, the Types 1800-P2 High-Frequency Multiplier and 1800-P3 Low-Frequency Multiplier.
Specifications
- Voltage Range: 0.1 to 150 V AC in 6 ranges; .01 to 150 V DC in 6 ranges
- Accuracy: DC and AC ±2% of full scale on 6 ranges; AC accuracy is for sinusoidal voltages
- Input Impedance: at low frequencies AC input resistance 25 MΩ; higher frequencies see manual; DC input resistance is 10 MΩ or open grid, selectable
Links
- Experimenter September 1956 describing Type 1800-B
- Experimenter May 1948 describing Type 1800-P2
- General Radio 1800-P3 Low-Frequency Multiplier Data Sheet 700-C 1954
- Experimenter December 1948 describing Type 1800-P3
- RCA 991 Voltage Regulator Data Sheet 1939
- RCA 9005 UHF Diode Data Sheet 1942
