1 Service and Repair
26 Keysight DAQ970A/DAQ973A Service Guide
Battery Check and Replacement
The internal battery, a CR2032 3 V lithium button battery, provides power to the
internal real-time clock and reading storage memory whenever the AC line power
is removed.
The internal battery may be monitored to verify operation as described below. A
low battery will typically give errors when ac line power is removed and then
re-applied. Any of the following errors may indicate a low battery:
201, “Memory lost: stored state”
202, “Memory lost: power-on state”
203, “Memory lost: stored measurements”
204, “Memory lost: time and date”
Verifying the capacity of the battery is recommended at the instrument’s annual
calibration. If you need to verify or replace the battery on the DAQ970A/DAQ973A,
be sure to unplug the instrument first. See “To verify or replace the battery” in the
next section for more details.
NOTE
The internal battery state does not affect the calibration memory. The battery
has an expected life of approximately 4 years. The battery life will be reduced if
the instrument is stored for prolonged periods at temperatures above 40 °C with
the ac power removed. The battery is not used whenever the AC line power is
applied to the instrument.
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