ZX25A switch type DC resistance box

1ZX25A switch type DC resistance boxOverview

The resistance elements of the switch type DC standard resistance box are all connected between the contacts, and the contact brushes fixed to the rotating frame move on the contacts. The resistor used in this type of resistance box is the resistance between the starting contact and the contact touched by the brush during use.

IIZX25A switch type DC resistance boxPurpose:

Used for precise adjustment of resistors in DC circuits.
Resistance box for whole machine calibration below one thousandth
Using a precision resistance box to calibrate portable DC single bridge and other equipment

3、 Main technical indicators of resistance box

Measurement range: 0.01---11111.1 ohms
When following the following usage conditions, the error of the resistance box will not exceed the basic error allowed in Table 1.

The ambient air temperature is 20- ± 3 ℃, and the relative humidity is below 80%;
The current is direct current;
The power shall not exceed the rated value.

3. The basic error of the resistance box is specified in Table 1:

Characteristics of Resistance Box Structure

The resistance box support has a potential lead out terminal that can be calibrated according to the components. The contact ring, contact piece, and brush in the switch are all tightly pressed with micro springs, so the contact resistance deteriorates less after use. The support is made of high insulation polystyrene material with good insulation performance. The readings on the panel are arranged in two straight lines for clear and concise reading. When all the conversion switches in the resistance box are placed in the zero position, the zero resistance is 0.01 ohms.

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