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Summary of Contents for YOKOGAWA 2768
- Page 1 User's 2768 Manual Precision Wheatstone Bridge IM 2768-01E IM 2768-01E 4th Edition: Oct. 2017 (YMI)
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Page 2: Introduction
Should any errors or omissions come to your attention however, please inform YOKOGAWA accordingly. • YOKOGAWA is by no means liable for any damage resulting from the user’s mishandling of the product. • This manual is intended to describe the functions of this product. -
Page 3: Cautionary Notes For Safe Use Of The Product
This manual is an essential part of the product; keep it a safe place for future reference. YOKOGAWA is by no means liable for any damage resulting from use of the instrument in contradiction to these cautionary notes. - Page 4 Do not use a mixture of different types of batteries or a mixture of old and new batteries. If the instrument will not be used for a prolonged period, remove the batteries before storage. The battery fluid will leak more readily during long-term storage, resulting in instrument malfunction. IM 2768-01E ― iii ―...
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Page 5: Table Of Contents
8. CIRCUIT DIAGRAM ..........13 IM 2768-01E... -
Page 6: General
1. GENERAL Precision Wheatstone Bridge 2768 is an instrument designed for measuring DC resistance from 0.1 Ω to 110 MΩ. This instrument is equipped with a galvanometer and a power source internally, and the measured value is indicated in-line indication without using any additional equipment externally. - Page 7 100 kΩ / 10 Ω ±0.01% *: At an ambient temperature of 23 ± 2°C, humidity of 75% R. H. and resistance ratio. Maximum Allowable Input: Ratio Arm; 0.2 W continuous Measuring Arm; 0.2 W / Element, continuous IM 2768-01E ― 2 ―...
- Page 8 Between the case and the circuits; 500 VAC, 1 minute Dimensions: Approx. 310 × 491 × 140 mm (not including a handle and mounts) Weight: Approx. 9.6 kg Accessories: User's Manual 1 each Battery 1 set IM 2768-01E ― 3 ―...
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Page 9: Component Names And Functions
(If the pointer reaches to the blue zone, the batteries are normal.) EXT. GA: Internal galvanometer is connected to the bridge circuit. In this case, the power source for the galvanometer is set to OFF. IM 2768-01E ― 4 ―... - Page 10 The case is located on the bottom of this instrument. Remove the cover by removing the screws to replace the batteries. The power source for the galvanometer is the dry cell battery (006P) located at the end of the case. IM 2768-01E ― 5 ―...
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Page 11: Measurment
Fig. 4.1 Rx and GUARD terminal Connection (3) Selection of Multiplying Factor (Range) Select the multiplying factor judging from the estimated value of the resistor under test connected to the Rx terminal. (Refer to the table listed in paragraph 2.) IM 2768-01E ― 6 ―... - Page 12 ρ ρc ρ ρ ρ : Noise Source (A) Leakage Resistance on Wheatstone Bridge ρ ρ ρ ρ Leakage Resistance ρ ρ GUARD ρ GUARD ρ (B) Guarded Wheatstone Bridge Fig. 4.2 Guard Terminal Connection IM 2768-01E ― 7 ―...
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Page 13: Measurement
When the galvanometer pointer indicates zero accurately, the value of unknown resistor can be obtained from the following: Rx = (Dial Reading) × Multiplying factor (Ω) IM 2768-01E ― 8 ―... -
Page 14: Precautions
Therefore, in measuring the resistance lower than 100 Ω, the influence of the lead wire resistance must be eliminated by measuring the resistor which is correctly calibrated, or by measuring the resistance of the lead wires. IM 2768-01E ― 9 ―... -
Page 15: Principle
Therefore, the unknown resistance Rx is obtained by multiplying the value of the measuring side dial Rs to the multiplying factor which is determined by the multiplying dial. ig=0 Fig. 6.1 Theoretical diagram IM 2768-01E ― 10 ―... -
Page 16: For More Effective Use Of The Instrument
(b) In case a DC power source unit is used, if the ripple of the unit is large, the satisfactory operation of the galvanometer may not be expected due to the influence of the large ripple. IM 2768-01E ― 11 ―... - Page 17 It is essential to complete the measurement as soon as possible. Be sure not set No. 1 dial of Rs to 0, and also not to short the Rx terminals. IM 2768-01E ― 12 ―...
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Page 18: Circuit Diagram
8. CIRCUIT DIAGRAM IM 2768-01E ― 13 ―... - Page 19 Printed in Japan...
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