1432-M

The General Radio 1432-M Decade Resistor was introduced in Catalog M (1951) and remained available through Catalog S (1965).

The Type 1432-M is decade resistance box comprised of five Type 510 decade resistance units in series, for a total resistance of 111,110 kΩ in steps of 1 Ω.

The 510 decade units use an 11-position switch, with the first position shorting the decade, and the following positions increasing the resistance by one step. The switch has a make-before-break configuration, i.e. regardless of the position there is always continuity between the terminals. The terminals are Type 938 equipped with a shorting link to the case. The decades are housed in an aluminum case shielded and insulated from its resistance terminals.

Specifications

• Total Resistance: 111,110 Ω
• Number of Decades: 5

Type 1432-M Installed 510 Decade Units

Decade Unit Type	Total Resistance Ohms	Resistance / Unit Ohms	Accuracy per increment	Maximum Current	Power/step
510-B	10	1	±0.15%	800 mA	0.6 W
510-C	100	10	±0.05%	250 mA	0.6 W
510-D	1,000	100	±0.05%	80 mA	0.6 W
510-E	10,000	1000	±0.05%	23 mA	0.5 W
510-F	100,000	10,000	±0.05%	7 mA	0.5 W

Links

• Experimenter June 1951 describing Type 1432 Series

1432-F – 3 decades, 111 Ω in steps of 0.1 Ω 1432-U – 4 decades, 111.1 Ω in steps of 0.01 Ω 1432-K – 4 decades, 1,111 Ω in steps of 0.1 Ω 1432-T – 5 decades, 1,111.1 Ω in steps of 0.01 Ω

1432-C – 3 decades, 11,100 Ω in steps of 10 Ω 1432-J – 4 decades, 11,110 Ω in steps of 1 Ω 1432-N – 5 decades, 11,111 Ω in steps of 0.1 Ω 1432-W – 6 decades, 11,111.1 Ω in steps of 0.01 Ω 1432-L – 4 decades, 111,100 Ω in steps of 10 Ω 1432-M – 5 decades, 111,110 Ω in steps of 1 Ω 1432-X – 6 decades, 111,111 Ω in steps of 0.1 Ω

1432-A – 3 decades, 1,110,000 Ω in steps of 1000 Ω 1432-Q – 4 decades, 1,111,000 Ω in steps of 100 Ω 1432-P – 5 decades, 1,111,100 Ω in steps of 10 Ω 1432-B – 6 decades, 1,111,110 Ω in steps of 1 Ω 1432-Y – 5 decades, 11,111,000 Ω in steps of 100 Ω 1432-Z – 6 decades, 11,111,100 Ω in steps of 10 Ω

Photos

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  510-B, 510-C, 510-D

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  510-D, 510-E, 510-F