14 GOSSEN METRAWATT GMBH
8.2 Read-Out a Periodic Ramp – RAMP Function
Ramp-type signals can be used to test dynamic performance
of devices under test, or entire measuring circuits. An exam-
ple would be control loop performance with a setpoint speci-
fied via the analog setpoint input at the controller. The instru-
ment can be used to replace costly hardware and software
for the set-up of long-term test bays with cyclical time
sequences.
Parameters for the ramps depicted below include:
• The following functions can be adjusted as output quanti-
ties:
voltage U, current sink I Sink, current source I Source,
resistance R or temperature temp.
•A lower (Start) and an upper (End) range limit can be
selected for each output quantity. For standard signals
these are always 0 … 10 V and 0/4 … 20 mA, and are
otherwise values from within the entire range.
• Rise time t1 and decline time t3 are
adjustable from 0 seconds … 60 minutes.
• Dwell time t2 at the upper and lower range limits is
adjustable from 0 seconds … 60 minutes.
• There are 2 ramp sequences:
– Once only: t1, t2, t3
– Repetitive: t1, t2, t3, t2, t1, t2, t3, …
Examples of Ramp Sequences:
Example of a Periodic Ramp Sequence
Manually Controlled Ramp Sequences
After configuring all parameters in accordance with the menu
flowchart on page 15, rising or declining ramps can be trig-
gered with the " and 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 Ramp Sequence
Ramp parameters
: Output quantity: U (0 … 15 V range),
Start =2V, End = 10 V, t1 = 5 s, t2 = 8 s, t3 = 5 s,
repeat = Yes (yes for periodic ramp)
Key
1 The sequence is started by pressing the ↵ key when ramp
start is displayed (see Menu Flowchart on page 16).
2 Stop the declining ramp within decline time t3 with the "
or the # key.
3 Start a rising ramp within remaining decline time t3 with
the " key.
4 Stop the ramp sequence with the " or the # key.
5 Start a declining ramp with the # key, remaining dwell
time t2 is deleted.
6 Stop the ramp sequence by simultaneously pressing and
holding the " and the # keys (2 audible acoustic signals
must be generated).
Start
End
t1
t2
t3
t2
Output
t
2V
10 V
t1 t2 t3
LCD:
t3 t2
t1
➀➁➂➃➄➅
t1 up t2 run t3 dn t3 hld t3 up t3 run t3 hld t1 dn
stop cont.
stop
cont.
U
[V]
+
"
#
#
"
#"#
"
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