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3.5.6.3 Store and Recall of the Long Term RAM
Reference Power
The Model 840-C can store and recall from long term RAM
memory the reference power level it uses to make decibel
(dB) measurements. To view this power level, perform
the following steps:
a.
Perform step a. above (Section 3.5.6.2).
b.
Press and hold the
STORE
key for more than 3
seconds. The following will happen:
1.
The Model 840-C will beep once initially and
then beep twice at the 3 second mark.
2.
The next power reading will be stored into
NVRAM. This stored reference power level can
then be recalled at any later time until a new
reference power level is saved through the
STORE
key.
c.
Press the
STORE
key once again to exit the
STORE
mode.
d.
Press and hold the
REF-dB
key for more than 3
seconds. The reference power stored in long term
RAM will be recalled and algebraically divided into
all subsequent power readings and the result
displayed (in dB).
The stored reference power level can be used to make dB
measurements at any time by pressing and holding the
REF-dB
key for more than 3 seconds.
Table 4 lists the error messages associated with Model
840-C operation.
Error Messages
3.6
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