GOSSEN METRAWATT GMBH
11
➭
Select a value for 0% (lower range limit) with the
"
#
keys and acknowledge with the
↵
key.
➭
Select a value for 100% (upper range limit) with the
"
#
keys and acknowledge with the
↵
key.
➭
The output range now includes a span of 0 to 100%, and
the unit of measure mA is displayed along with a percent-
age value.
➭
Exit the “percentage simulation” function by pressing the
ESC
key, or by turning the rotary switch.
8
Interval Functions, Ramp Functions and Procedures
Two types of setpoint sequences can be generated in order
to simulate sensor conditions at the inputs of transducers,
transmitters and buffer amplifiers:
Interval sequences (see chapter 8.1)
Ramp sequences (see chapter 8.2)
With the help of METRAwin
90-2 software as an accessory,
procedures with up to 99 steps can be generated at the PC
in addition to the above mentioned sequences.
The following parameters must be specified to this end:
measuring function, measuring range, tolerance limits, abso-
lute limit values, setpoints and expected values. Up to 10
procedures can be uploaded to the calibrator. The proce-
dures are then selected by name and started on-site. Mea-
sured values saved to the procedures can be subsequently
read out with a PC.
8.1
Interval Sequences – INT Function
Output ranges are divided into rising or declining interval
steps with this function, and the number of interval steps, as
well as their duration, can be specified. Above all, this func-
tion is suited for the calibration of analog indicators and
recorders during single-handed operation.
Input parameters for interval sequences include:
•
All simulator functions except for Hz can be adjusted as
output quantities.
•
A lower (
Start
) and an upper (
End
) range limit can be
selected for each output quantity from within the overall
range.
•
The number of steps can be set within a range of
1
…
99.9. The number of steps can be entered as a
whole number as well, which is especially practical for
analog indicators and recorders with non-standardized
scale divisions.
•
The interval duration per step (t1) can be selected from
within a range of 1 second to
60 minutes.
•
The sequences can be run manually or automatically.
•
Step jumps can be selected manually (
Auto
= no) with the
"
#
keys, or automatically (
AUT
= yes) with selectable
time per step.
Examples of Interval Sequences:
Manual Interval Sequence
After configuring all parameters in accordance with the menu
flowchart on page 13 for manual interval sequence read-out
(
I
nt
,
Auto
=
no
), the individual steps can be triggered with the
"
#
keys.
The relationship between the output signal and each of the
key operations is depicted with the help of the following
example.
Example of a Manually Controlled Interval Sequence
Key
1 The sequence is started by pressing the
↵
key when
I
nt
start
is displayed (see Menu Flowchart on page 12).
2 The sequence is stopped by pressing the
"
or
the
#
key, and is started again in the corresponding direction
when the same key is pressed once again.
3 Stop the interval sequence by simultaneously pressing
and holding the
"
and
the
#
key (2 audible acoustic sig-
nals must be generated).
4
8
12
16
20
t [s]
I
Source
manual
stop
[mA]
➀
➂
➁
The time intervals are only identical during
automatic operation.
+
" " " "
"
#
"
# # #