GenRad 1492 Decade Inductor

GenRad 1492 Decade Inductor


7 decade switches ranging from 1 µH to 1 H increments

Inductance range from 1 mH or 100 µH to 11 H

Toroidal cores for small mutual inductance and minimal effect from external fields

High-accuracy: ±(1% + 0.75 µH)

The 1492 model is an excellent choice for a highly accurate decade inductance substituter with a wide range. It is suitable for most laboratory and test applications.

The 1492 Inductance decade series are convenient elements for use in wave filters, equalizers, and turned circuits throughout the range of audio and low radio frequencies. As components in oscillators, analyzers, and similar equipment, they are especially useful during the preliminary design period, when the ability to vary circuit elements over relatively wide ranges is necessary to determine optimum operating values. The 1492 Decade Inductors have values of low-frequency storage factor, Q, that are much larger than those of air-core coils.





1491D Decade inductor, 4 decades, 11.11 H total inductance, 1 mH per step

1491G - Decade inductor, 5 decades, 11.111 H total inductance, 100 µH per step


Accuracy (Low Frequency, Low Signal Level):

Model                  100 µH                  1 mH     10 mH  100 mH                 1 H

1491-D N/A       2%          1.6%      0.8%      0.8%

1491-G                 2%          2%          1.6%      0.8%      0.8%


Frequency Characteristics: Percentage increase in effective series inductance (above the zero-frequency value, Lo) may be obtained by interpolation in accompanying graph (see Figure 2 on datasheet or in manual) for any setting to the highest-value decade used, when LOW terminal is grounded to cabinet.


Zero Inductance: Approximately 1 μH


Maximum Voltage: 500V rms. Switch will break circuit at 500V if turned rapidly, but voltages above 150V may cause destructive arcing with switch between detent positions.


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