Omega DP20 User Manual

13
DP20 Economical Multisignal meter Instruction Manual
• Measuring process signals
The instrument accepts the measure of process signals
in 4/20 mA and 0/10 Vdc. The instrument provides
excitaon voltage to power up transducers.
• Scaling
The instrument allows to scale the reading to 4 digits (9999 / -1999)
with congurable decimal point to any posion. The ‘second scaling’
funcon can also be used (see secon 1.24).
• Maximum oversignal
‘Maximum oversignal’ is the maximum signal accepted by the in-
strument. Higher signal values may cause instrument damage. Low-
er values are non destrucve but may be out of accuracy specica-
ons.
• Response mes
The response me to a signal step is 300 mSeconds, independent of
the signal range selected.
• Terminal 5 ‘mulfuncon’ - ‘Vexc’ or ‘External control’
To congure the +15 Vdc excitaon voltage at terminal 5, set internal
jumper ‘T’ at posion 1-2 (see secon 1.9). Transducers with a
consumpon of up to 30 mA can be powered from this terminal.
To congure the ‘EK’ external contact funcon at terminal 5, set
internal jumper ‘T’ at posion 4-5 (see secon 1.9). See secon 1.9
for a list of available funcons.
1.16 Process measures
1.17 Measuring frequency
• Start-up, connecons and jumpers
For instrument start-up follow the steps listed at secon 1.7. Signal
connecons are indicated at secon 1.5. Locaon for internal
jumpers is indicated at secon 1.9.
See below a list of typical connecons :
mA +
mA -
12345
• signal 4/20 mA acve
signal ( mA-)
• signal 4/20 mA passive
+15 Vdc (mA+)
12345
+Vdc
common
• signal 0/10 Vdc passive
+15 Vdc
12345
+Vdc
common
• signal 0/10 Vdc acve
12345
• How the instrument measures frequency
The instrument measures frequency from an AC
voltage (Vac) or AC current (Aac) signal. The instrument
detects each ‘0’ crossing of the signal, either ‘0 Vac’
or ‘0 Aac’. All available Vac and Aac signal ranges are
accepted as frequency input signal.
• How to congure the instrument to measure frequency
To measure frequency from a Vac signal, select the internal
jumpers for the desired AC voltage range (see secon 1.9), connect
the signal for the selected voltage range (see secon 1.10), and
congure the instrument to measure frequency (see secon 1.29.1).
The same applies to measure frequency from Aac signals. See
example at secon below.
Ranges
of measure
Scale
by default Scalable
AC signal
(see secon 1.9)
Jumper
'T'
Response
me
Accuracy
(% reading)
15 to 100Hz 0/100.0 from 9999
to -1999
select Vac or
Aac range
4-5 70mSec. <0.15% of
reading
Table 16 - Ranges of measure for frequency
• Scaling
The default resoluon is 0.1 Hz. The instrument allows to scale the
reading to 4 digits (9999 / -1999) with congurable decimal point
to any posion. The ‘second scaling’ funcon can also be used (see
secon 1.25).
• Maximum and minimum signal
Frequency signals below 15 Hz are measured as ‘0’. Frequency
signals higher than 100 Hz are out of accuracy. Signals higher than
1000 Hz will read ‘display overow’ ‘d.oVr’ error.
Ranges
of measure
Scale
by default Scalable
Jumper ‘S’
(see secon 1.9)
Jumper ‘T’
(see secon 1.9)
Accuracy
(%FS)
Max.
oversignal
Connecon
(terminals)
Z
in
4/20 mA
passive
(needs Vexc.)
0/100.0
de 9999
a - 1999
D
1-2
<0.15% 25 mA
2 (signal)
5 (Vexc)
4.7 Ohm
acve 4-5
2 (mA+)
4 (mA-)
0/10 Vdc
passive
(needs Vexc.)
A
1-2
<0.20% 25 Vdc
2 (+Vdc)
4 (comm.)
5 (Vexc)
1 M
acve 4-5
2 (+Vdc)
4 (comm.)
Table 15 - Ranges of measure for process signals
• Example
To measure the 50 Hz frequency from a 230 Vac
power line, select jumpers ‘GI’ for 600 Vac signal
range (see secon 1.9), connect signal to terminals
‘1’ and ‘4’ (see secon 1.10), and congure
‘frequency’ at the input signal conguraon menu
(see secon 1.29.1).

Omega DP20 Specifications

General

Brand	Omega
Model	DP20
Category	Measuring Instruments
Language	English