Memory
View
State
πrog.I
Prog.Start
Ext.Signa
Prog.Start
Time
02.06.93
12:23:47
Prog.Start
Overrun
K1: %
+ 50.00
Prog.Start
Underrun
K1: %
+ 50.00
Prog.Start
Gradient
K1: %
5.00
8.3 Memory
8.3.3.1 Program starting criterion
Select a starting criterion:
External signal
The starting command is triggered when an external
voltage signal is input. Please use the lead
0554.0012 (See Ordering data) when inputting an
external voltage signal. In the case of a trigger circuit
the limit values of the trigger input must be adhered
to (Refer to Technical data). The trigger input in
testo 454 is electrically isolated from the other
circuit.
Time
The program start is made dependent on the date
and time. If the instrument is switched off the start is
delayed by approximately 5 seconds until the instru-
ment has completed the function test and probe rec-
ognition.
Overrun
Saving begins when the measured value of a param-
eter, defined by you, overruns on a channel specified
by you. An intermediate rate is recommended to
check the starting criterion frequently (see Chap.
8.6.5).
Underrun
Saving begins when the measured value of a param-
eter, defined by you, underruns on a channel speci-
fied by you. An intermediate rate is recommended to
check the starting criterion frequently (see Chap.
8.6.5).
Gradient
The program is started once the measured value of a
specified parameter in the defined channel changes
quicker than that of the limit value defined by you.
The specified value refers to:
∆ t = 1 s
The display opposite means that
the program is started when the measured value
changes by more than 5 %RH in 1 second.
Difference
When the differential value (of a parameter) in two of
the channels specified by you is overrun measure-
ment is started. If, for example, the temperature of
K1 is 50 °C below that of K2 the program is started.
∆ <w>
∆ t
Programm
Rate
˛1s
Prog.Start
Difference
K2: °C -K1
25.00
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