CMT CMT-300 - Page 17

2) PERCENT mode - the reading taken is displayed
as a percentage of the reference value.
3) DB mode - the reading taken is compared with
the reference value, and the result is express-
ed in decibels:
Result = -10 log(Reading/Reference)
To select this option, press the [REF] key. When
prompted with "MODE?0,%,DB", key in O, % (this is
a shifted key), or DB to select one of the modes
described above. If you entered an irrelevant
character, the OFFSET mode is selected. If you do
not specify a mode before pressing [R/S], the mode
will remain the same as previously set.
The reference value may be entered in two ways.
If you enter a value via the keyboard when prompt-
ed with "REF=?", that value will be taken as the
reference. The following readings will be adjusted
according to the mode chosen. The user flag 01
will be set to indicate that one of the reference
modes is active.
If you press [R/S] without first entering a value,
the program expects a measurement result to be
stored as the reference. In this case, flag 01 is
not set. Instead, flag 02 will be displayed to
indicate that a reading is to be stored as the
reference. Program execution returns to the main
loop, displaying unadjusted readings. Press
[STOP] when the desired reading is obtained. Then
press [R/S] to continue. The last displayed read-
ing will be stored as the reference value. Flag
02 will be cleared and flag 01 will be set.
To abort this option, press the [REF] key and
specify 0 as the reference value.
Remark: When both the CUSTOM PROGRAM (see below)
and the REFERENCE options are active, the former
will be executed first. Therefore, the reference
value should be specified with respect to the