User Guide
Capacitance Decade Box
Model 380405
Introduction
Congratulations on your purchase of the Extech 380405 Capacitance Decade Box. This device
offers 5 decades of capacitance ranges from 100pF to 11.111uF (in 100pF steps). Slide switches
allow easy addition and subtraction of capacitance values. Binding posts (3) offer simple and secure
connections. Careful use of this decade box will provide years of reliable service.
Specifications
Capacitance ranges
Internal Residual Cap:
Voltage limit
Connection
Accuracy
Operating conditions
Dimensions/Weight
100pF to 11.111uF in 100pF steps
50pF maximum
50VDC (non-polarized capacitors)
Three (3) binding posts
5% (< 1uF: 1kHz test frequency; > 1uF: 100Hz test frequency)
Temperature: 32 to 122oF (0 to 50oC) / Humidity: < 80%RH
5.79 x 4.61 x 1.3" (14.7 x 11.7 x 3.3cm) / Approx. 0.69 lbs. (312g)
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 Capacitance 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 380405 case.
Range Selection
The 20 front panel switches are used to select the capacitance that will be output 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 capacitance available at the posts. When the switch is set to OUT it is excluded from
the total capacitance. If all of the switches are set to OUT, the total output capacitance will be zero (+ 50pF residual capacitance – approx).
For example, if the desired output value is 10.5uF, set the following switches to the IN position: 4uF, 3uF, 2uF, 1uF, 0.4uF, and 0.1uF.
Testing
This device can be used to verify the calibration integrity of multimeters, LCR meters, calibrators, etc. Connect as described in the Binding Post
Connections section above, and then set the capacitance switches to output the desired capacitance. Ensure that the voltage supplied by the device
under test is not greater than 50VDC. The device under test should read the value of capacitance selected on the tester. If it does not, the device
under test may need calibration, adjustment, or repair.
Calibration and Repair Services
Extech offers complete repair and calibration services for all of the products we sell. For periodic calibration, NIST certification on most products
or repair of any Extech product, call customer service for details on services available. Extech recommends that calibration be performed on an
annual basis to ensure calibration integrity.
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty
applies on sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department
at (781) 890-7440 ext. 210 for authorization or visit our website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA number). A Return
Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to
prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper
maintenance or repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for
any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no
other warranty, whether written or oral, is expressed or implied.
Copyright © 2002 Extech Instruments Corporation.
All rights reserved including the right of reproduction in whole or in part in any form.
Model 380405 Version 1.1 August 2002
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