Resistance Decade Box - GME Technology, LLC.
Contents
1. Resistance Decade Box Model RD 300 Introduction The RD 300 Resistance Decade Box is a convenient tool aiding you both in design and testing as well as calibration of your test equipment When needed to determine the correct resistance value the RD 300 offers 7 decades of resistance ranges from 1 to over 11MQ in 10 steps Slide switches allow for easy addition and subtraction of resistance values Switches that are in the ON position are clearly marked by a white dot below it to easily distinguish it from those that are OFF A rubber boot allows the user to prop up the unit for ease of viewing and changing of values Specifications Resistance ranges 1 to 11 111 110Q in 10 steps Internal Resistance 0 30 Power 1W Resistors Connection Two 2 binding posts Accuracy 1 Operating conditions Temperature 32 to 1220F 0 to 500C Humidity lt 830 RH Dimensions Weight 6 x 3 7 x 1 9 Weight Approx 0 95 Ibs Operation Binding Post Connections To connect the RD 300 connect the positive lead to the RED post and the negative lead to the BLACK post To make the connection a banana plug can be inserted directly into the posts An alternate method is to thread wire through the posts In order to do this unscrew the post thread your wire and finally retighten the post as necessary An alligator clip can be attached to the plugs as well However use alligator clips with caution to avoid wearing down the posts Range Selection Th2. e RD 300 contains 28 switches organized in a 4 x 7 grid Each row offers 7 decade of resistance ranges When a switch is in the ON position the value marked above the switch is added to the total resistance For example to obtain an output resistance of 40 23KQ the switches for 40K 2000 and 300 will be in the ON position Testing The RD 300 can be used for calibration of your test equipment due to its 1 accuracy For calibration set the RD 300 to the desired value and connect the terminals of your test equipment to the output of RD 300 The readout of the device you are testing should be the selected resistance value 0 30 internal resistance approx If not adjust the device you are testing accordingly Limited One Year Warranty
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