我们厂里一台ARL3460的直读式光谱仪老是报#155 ICS:IVFC EBS,Electronic bg value read is over or unerflow.#157 ICS:IVFC EBS,Electronic bg value read is set unerfiow.#919 ICS:Exception event on channel or condit id#19.#920 ICS:Exception event on channel or condit id #20  请各位大神支支招