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DO30系列数字式三用表校验仪是一种四位数字式交直流电流电压发生器,用于检定万用表及0.5级以下的各类电工仪表非常方便可靠。该仪器一般可用精度为±0.05％以上的交直流数字繁用表对其交直流电流、电压档进行直接校验。但存在以下几个方面的问题: 1.一般国产的数字式繁用表测量范围有限,不能覆盖被测仪器的所有量限。 2.交流部分测量精度较低,达不到测量要求。 3.进口或精度较高一点的数字式繁用表价格昂贵,一般地、县级计量部门尚不具备购买条件。鉴于以上原因,我们在工作中应用上海电表厂生产的XF1b型精密电表校验装置取代数字式繁用表对DO30-B、DO30-C型三用表校验仪进行校验,取得了比较满意的效果。具体方法介绍如下: 一、校验原理及方法 1.交直流电流档的校验校验原理如图1所示。
DO30 series digital three-meter calibrator is a four-digit digital AC and DC current voltage generator for testing multimeter and 0.5 below the various types of electrical instrumentation is very easy and reliable. The instrument can generally be more than ± 0.05% accuracy of AC and DC digital table with its AC and DC current, voltage file for direct verification. However, the following problems exist: 1. The general domestic digital multimeter has limited measurement range and can not cover all the limits of the instrument under test. 2. Exchange part of the measurement accuracy is lower, less than the measurement requirements. 3. Import or higher precision digital multimeter expensive, in general, the county level measurement departments do not yet have the conditions for the purchase. In view of the above reasons, we used the XF1b-type precision meter calibration device produced by Shanghai Ammeter to replace the digital multimeter to verify the DO30-B and DO30-C three-meter calibrators and achieved satisfactory results Effect. Specific methods are described below: First, the principle and method of calibration 1. AC and DC current file calibration verification principle shown in Figure 1.