30
34405A User’s and Service Guide
2
Features and Functions
dB
When enabled, the dB operation computes the dBm value for the next
reading, stores the dBm result into the dB Ref register and immediately
produces the following calculation. The first displayed reading is always
precisely 000.00 dB.
dB
= 10 x Log
10
[ (Reading
2
/ R
REF
) / 0.001W ] - dB Ref
•
You can set dB Ref to any value between 0 dBm and
\
120.0000 dBm.
The default R
REF
is 0 dBm.
•
Numeric results are displayed in the range of ± 120.000 dB with 0.01
dB resolution shown, independent of the number of digits setting.
You can view and edit the dB Ref Value in the secondary display as
described in
“Editing Values in the Secondary Display”
on page 40. The dB
Ref value is displayed on the secondary display in the range of ± 120.000
dBm with 0.001 dBm resolution shown.
Min/Max
The Min/Max (Minimum/Maximum) operation stores the minimum and
maximum values, the average, and the number of readings during a series
of measurements.
When enabled, the Min/Max operation turns on the
MnMx
annunciator
and begins accumulating various statistics about the readings being
displayed.
Each time a new minimum or maximum value is stored, the instrument
beeps once (if the beeper is enabled) and briefly turns on the appropriate
Max
or
Min
annunciator. The multimeter calculates the average of all
readings and records the number of readings taken since Min/Max was
enabled.
•
Accumulated statistics are:
•
Max- - maximum reading since Min/Max was enabled
•
Min- - minimum reading since Min/Max was enabled
•
Avg- - average of all readings since Min/Max was enabled
•
N- - number of readings taken since Min/Max was enabled
dB
Null
Null
Shift
MnMx
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