QJ44 type DC portable bridge arms and the city of DC power type FMQJ44 bridge arms. Containing (high-sensitivity electronics) and the work of galvanometer current, suitable for industrial and mining enterprises, laboratories or workshops on the DC scene for the accurate measurement of low-value resistor, for example, used to measure the conductivity coefficient of the metal conductor, contact resistance, motor, transformer windings resistance values, as well as other types of low DC resistance.

Fifth, maintenance and attention
1, apparatus should be placed on the ambient air temperature 5 ~ 35 , relative humidity less than 80 indoor air should not contain corrosive gas.
If the machines do not have long-term, will remove the batteries.
2, apparatus if proof can not be "standard", should be considered on the 1st due to batteries life has been completed. Low the Department to open the battery lid apparatus, according to level of plus or minus 5 Add 1 or 6 dry batteries. Into the new batteries, when used to its current stability, after the discharge into the 20 to 30 minutes, the benchmark may also be power to the battery life has been completed 6F229V be change.
3, in use, such as sensitivity galvanometer found a significant drop or no deflection, may be power transistors galvanometer 9V battery life to the end caused the Department to open the left side of the battery low apparatus lid, insert the battery is not 6F229V laminated section, the replacement .
4, apparatus should be once a year to ensure the accuracy of instruments.
5, shelving equipment re-use of long-term, should the switch, slide line, rotating several times to reduce the impact of exposure to oxidation, so that a reliable instrument.
6, the user to comply with the rules of the custody and use of the conditions, from the date of shipment from the factory in 10 months due to poor product quality can not damage normal working hours, the manufacturing plant, due to users free of charge repair or replacement of parts.