HA250385
Issue 7 Nov 06
Page 69
MULTIPOINT CIRCULAR-CHART RECORDER: USER GUIDE
Level 1 functions
Level 2 functions (additional to level 1 functions)
Off
Constant
Copy
Add
Subtract
Multiply
Divide
Modulus
Square root
Channel average
DV Group average
Rolling average
ex
logn
10x
log10
Rate of change
Sample and hold
Channel minimum
DV group latching minimum
DV group continuous minimum
Channel maximum
DV group latching maximum
DV group continuous maximum
Third order polynomial
Relative humidity
F value
Linear mass flow
Square root mass flow
Zirconia probe
Switch
High select
Low select
Stopwatch
Time stamp
O2 Correction
Percentile
7 MATHS PACK OPTION
7.1 INTRODUCTION
The math pack option provides 16 'derived' channels (DV1 to DV16), in addition to the measuring channels.
The option comes in three levels: level 1 which provides basic arithmetic functions, level 2 which provides advanced
functions such as averaging, relative humidity calculations, mass flow etc. and level 3 which is a display format only .
Scientific notation displays calculated values using a mantissa and an exponent of 10 (e.g. 1000 = 1.00
+3
). The func-
tions for levels 1 & 2 are listed in table 7.1 below.
Table 7.1 Math functions
7.1.1 Groups
Derived channels can be added to the log and display groups described in section 4.6. The operator can edit these
groups to contain only those items which are to be logged or which are to appear at the display.
The Level 2 math pack option adds a further group, called the DV group, which can contain only derived and meas-
uring channels (i.e. not totalizers or counters). The group can be used to assemble channels which are to be part of
group averaging, group max/min, or group reset of averages, sample-and-hold, etc.
7.1.2 Jobs
The following jobs are added to the list given in section 4.5.1
Reset channel NN
Reset all DVs
Switch to B on NN
Disable channel NN
Disable all DVs
Trigger Ch NN
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