HA243821
Issue 5 Mar 98
Section5
Page 5 - 5
MODEL 346 INSTALLATION AND OPERATION MANUAL
5.2 TOTALISER CONFIGURATION (Cont.)
TOTALISER SOURCE
TTN Source
Source
The up/down/ arrow keys are used to choose the source for the totaliser from measuring channel, derived channel
or event input. Once the source has been selected, operation of the ENTER key will call the next configuration
page.
TOTALISER FACTOR
TTN Factor
Factor
The up/down/side arrow keys are used to enter a factor, according to the type of input specified in the previous
page. The factor is entered as a single digit, followed by a power of ten. (See examples below).Channel sourceThe
totaliser factor defines the time rate of the source channel in seconds. The page can also be used to define a ratio
of measured counts per second to totalised counts.Event input sourceThe totaliser factor defines the scaling (ra-
tio) of input counts to totalised counts.
EXAMPLES
1. To enter in seconds (as required), a time rate measured in hours, the factor is the number of seconds in an
hour = 60 x 60 = 3,600, which can be written as 3.6 x 1000, or alternatively, 3.6 x 10
3
When written in such a way, the value ‘3.6’ is called the mantissa, and the ‘3’ in ‘103’ is called the exponent.
The factor is entered in two pages, 3.6 being entered in the ‘Mantissa’ page, and ‘3’ in the ‘Exponent’ page:
TT1 Fact Man
3.6000 Mant.
TT1 Fact Exp
3 Exp.
2. To enter in seconds, a time rate measured in days, the factor is the number of seconds in a day (86,400). This
can be written as 8.64 x 10,000 or 8.64 x 10
4
. Thus, in order to enter the factor, ‘8.64’ is entered in the
Mantissa page, and ‘4’ in the exp. page.
TT1 Fact Man
8.6400 Mant.
TT1 Fact Exp
4 Exp.
