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RESISTANCE MEASUREMENTS - 14188_133
SUMMARY - 14188_135

Neets Module 16-Introduction to Test Equipment
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4-24 error of 1 percent if it shunts a 10-megohm resistor. Using the following steps, you will be able to measure dc resistance ONLY: 1.   Turn the DET GAIN control to 2. 2.   Set the FUNCTION switch to R 1 or R 10. 3.   Set L-R-C decade dials to 3.000. 4.   Connect the unknown resistor to R-L terminals 1 and 2. 5.   Set the GEN-DET switch to INT DC. 6.   Adjust the RANGE switch for minimum detector deflection. 7.   Adjust L-R-C decade dials for null, turning the DET GAIN control clockwise to increase sensitivity as necessary. 8.   The measured resistance is the product of the L-R-C decade dial setting times the RANGE and FUNCTION switch settings. CAPACITANCE MEASUREMENTS Capacitance is measured in terms of a two-element equivalent circuit consisting of a capacitor in series with a resistor. The internal ac generator and detector of the model 250DE bridge are tuned to 1 kilohertz. Other frequencies can be used, but an external generator and detector are required. The D and Q ranges of the bridge can be extended by use of an external rheostat connected to the terminals provided. The measured capacitance is the product of the L-R-C dial setting times the setting of the RANGE switch. Using the following steps, you can make a standard capacitance measurement: 1.   Turn the DET GAIN control to 1. 2.   Set the FUNCTION switch to C, D 0.1 or D 0.01 SERIES. 3.   Set L-R-C decade dials to 3.000 and D-Q dial to 0. 4.   Connect the unknown capacitor to C terminals 2 and 3. 5.   Set the GEN DET switch to INT 1 kHz. 6.   Adjust the RANGE SWITCH for minimum detector deflection. 7.   Adjust L-R-C decade dials and D-Q dial alternately for a minimum meter deflection, turning the DET GAIN control clockwise to increase sensitivity as necessary. 8.   The measured capacitance is the product of the L-R-C decade dial settings. 9.   The measured dissipation factor (D) is the product of the D-Q setting times the FUNCTION switch setting. INDUCTANCE MEASUREMENTS Inductance is measured in terms of a two-element equivalent circuit consisting of an inductance either in series or in parallel with a resistance. The internal ac generator and detector of the model 250DE bridge are tuned to 1 kHz. Other frequencies can be used, but like capacitance measurements, an external






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