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Resistance Decade Box
Model 380400
Introduction
Congratulations on your purchase of the Extech 380400 Resistance Decade Box. This device offers 7
decades of resistance ranges from 1 to over 11MΩ (in 1Ω steps). Slide switches allow easy addition and
subtraction of resistance values. Binding posts (3) offer simple and secure connections. Careful use of
this decade box will provide years of reliable service.
Specifications
Resistance ranges 1 to 11,111,110Ω in 1Ω steps
Internal Resistance 0.3Ω
Power 0.3W Resistors
Connection Three (3) binding posts
Accuracy 1%
Operating conditions Temperature: 32 to 122
Dimensions/Weight 5.79 x 4.61 x 1.3" (14.7 x 11.7 x 3.3cm) / Approx. 0.69 lbs. (312g)
o
F (0 to 50oC) / Humidity: < 80%RH
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Back to the Extech 380400 Product Page
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Operation
Binding Post Connections
The binding posts can be used for connections in several ways:
1. A banana plug can be inserted directly into the posts.
2. Bare wire can be threaded through the post after it has been unscrewed. Once the bare wire is threaded, tighten the posts as necessary.
3. Alligator clips can be used but use caution not to strip the post threads or plastic post housing.
The resistance output is available on the RED and the BLACK binding posts. The WHITE post is case ground and is typically not used. Connect the
positive lead of the device under test to the RED post. Connect the negative lead to the BLACK post. Use the WHITE grounding post only if the device
under test will be grounded to the 380400 case.
Range Selection
The 28 front panel switches are used to select the resistance that will be available on the RED and BLACK terminals. When a switch is set to the IN
position, the value printed above the switch is added to the total resistance available at the posts. When the switch is set to OUT it is excluded from
the total resistance. If all of the switches are set to OUT, the total output resistance is zero (+ 0.3Ω internal resistance – approx.).
For example, if the desired output value is 10.5KΩ, set the following switches to the IN position: 10K, 400Ω, and 100Ω.
Testing
This device can be used to verify the calibration integrity of MultiMeters, LCR meters, Calibrators, etc. Connect as described above in the Binding
Post Connection section. Set the resistance switches to output the desired resistance. Ensure that the voltage supplied by the device under test does
not overload the 0.3W internal resistor power rating. The device under test should read the value of resistance selected on the tester. If it does not,
the device under test may need calibration, adjustment, or repair.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
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