I have a circuit card that uses the M48T18-150PC1 Timekeeper SRAM, and the battery died. I replaced the part but the settings did not save once power was cycled. A second part was used with the same result. Looking at the date stamp, (412) tells me I'm possibly at the limit of the battery's life. I tried measuring the voltage (Vcc to Vss), but have no reading at all. The replacement units integrity are questionable, so I'm wondering if I'm measuring something wrong. Is there a latch I'm not aware of that prevents me from measuring this voltage? Any help would be appreciated. In the meantime, I have placed an order for new parts hoping this will solve my problem.
Regards,
Bob
