PHYWE Cobra4 Sensor-Unit Energy Operating Instructions Manual

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PHYWE Systeme GmbH & Co. KG
Robert-Bosch-Breite 10
D-37079 Göttingen

Phone [phone]
Fax [phone]
E-mail [e-mail]

The unit complies with
the corresponding EC

Cobra4 Sensor-Unit Energy

12656-00

Fig. 1: 12656-00 Cobra4 Sensor-Unit Energy

CONTENTS

1 SAFETY PRECAUTIONS

2 PURPOSE AND CHARACTERISTICS

3 FUNCTIONAL AND OPERATING ELEMENTS

3.1 Operating elements

3.2 Functional elements

4 NOTES ON OPERATION

5 HANDLING

5.1 Putting Cobra4 Sensor-Unit Energy into operation

6 TECHNICAL SPECIFICATIONS

7 PARTS SUPPLIED

8 NOTES ON THE GUARANTEE

9 WASTE DISPOSAL

1 SAFETY PRECAUTIONS

• Carefully read these operating instructions completely
before operating this instrument. In addition, please simi­larly read the operating instructions for the measured
data recording instrument (Cobra4 Wireless-Link, Cobra4
USB-Link, Cobra4 Junior-Link or Cobra4 Mobile-Link)
that is to be used. This is necessary to avoid damage to
it, as well as for user-safety.

• Only use the instrument for the purpose for which it was
designed.

• Only use the instrument in dry rooms in which there is no
risk of explosion.

• Protect Cobra4 Sensor-Unit Energy from dust, moisture
and vapours. Use a slightly moist lint-free cloth to clean
the instrument. Do not use aggressive cleaning agents or
solvents.

• Take care that no liquid penetrates in through the hous-
ing openings, as such penetration would result in dam­age to Cobra4 Sensor-Unit Energy.

• When using the instrument in the open air, do not allow
rainwater or splash water to enter into the housing.

• Do not open up the instrument.

• Only connect the data output of Cobra4 Sensor-Unit En-

ergy to the measured data recording instruments specifi­cally intended for it.

• The present-day state of software development makes it
impossible to guarantee that a product is free of faults.
PHYWE Systeme GmbH & Co. KG therefore does not
take on any liability for damages that occur during the in­stallation or the use of the instrument.

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2 PURPOSE AND CHARACTERISTICS

Cobra4 Sensor-Unit Energy serves to measure and directly
display dimensions of electric power and energy in direct and
alternating current circuits (current, voltage, reactive power,
real power and apparent power, phase shift, frequency, elec­tric work).
Three measurement modes are offered: “u(t), i(t)”, “Energy
DC” and “Energy AC”.

According to the application, Cobra4 Sensor-Unit Energy can
be connected to any one of the following measured data re­cording instruments for data transmission to it;

• to Cobra4 Wireless-Link (12601-00) for wireless trans-
mission of data to a computer,

• to Cobra4 USB-Link (12610-00) for wireless transmis-
sion of data to a computer via a USB-cable,

• to Cobra4 Junior-Link (12615-00) also for wireless
transmission of data to a computer via a USB-cable,

• to a hand-held Cobra4 Mobile-Link (12620-00).

The ports for the measured data recording instruments are
on the front of the Sensor-Unit, whereby mechanically secure
locking in position is ensured by the hole and engaging
mushroom combination.

The measurement inputs for current and voltage are on the
top side of the Sensor-Unit. These inputs are galvanically
separated.
Instantaneous values of current and voltage can be meas­ured in the “u(t), i(t)” measurement mode. In “Energy DC” and
“Energy AC” modes, and supplementary to current and volt­age measurement, a microcontroller directly calculates de­rived electric dimensions from measured values and makes
their values directly available as live measured values. Real
effective values (true RMS) are measured in particular in
“Energy AC” mode.

The Sensor-Unit is protected against overvoltage and over­current (see Technical specifications). It even holds up to the
short-circuit currents of student power supply 13505-93 and
universal power supply 13500-93 which are above the maxi­mum overcurrent specified for the Sensor-Unit.
This is important, as short circuit currents are frequently
above stated maximum current values for power supplies.

3 FUNCTIONAL AND OPERATING ELEMENTS

3.1 Operating elements

Cobra4 Sensor-Unit Energy has no manual operating ele­ments. Operation of it is either via the Cobra4 Mobile-Link
hand-held measuring instrument , or via a computer to which
a Cobra4 USB-Link, Cobra4 Junior-Link or Cobra4 Wireless­Link has been connected, and is possible as soon as the
connection between the Sensor-Unit and one of the three
measured data recording instruments has been made.

3.2 Functional elements

Cobra4 Sensor-Unit Energy has one voltage input and two
current inputs. The current inputs are to be switched accord­ing to the measuring range. Please note here that the greater
measuring range must always be used to start with. This is
necessary to avoid faulty functioning.
Sensor-Unit Energy is designed so that it can be installed as
a fixed part of a circuit in which measurements are to be
made (current-voltage measuring unit, see Figure 2b). Cur­rent and voltage measurements can also be individually
made. They must both be switched to the “Energy AC” or
“Energy DC” measurement mode when electrical dimensions
(power, work etc.) are also to be measured.

Fig. 2a: Sensor-Unit Energy (view from above): Voltage and
current inputs, examples of wiring as fixed component in a
circuit, see Fig. 2.

Fig. 2b: Possible wirings for Sensor-Unit Energy

Further important information on the three operating types /
modes:

“u(t), i(t)”: Recording of instantaneous values

“Energy DC”: Moving average for measurement of equal

sizes as well as calculation of real power
and work. The averaging is helpful in the
measurement of small currents or voltages.
This operating mode is also suitable for re­cording instantaneous values at smaller
scan rates than with “u(t), i(t)”.

“Energy AC”: Effective values (true RMS) of periodic volt-

age and current signals as well as the calcu­lation of reactive, real and apparent power,
electric work or energy, phase shift in ° and
also frequency

The volt and current meters can be separately used In the
operating modes “u(t), i(t)” and “Energy DC”. In the “Energy
AC” operating mode, however, only the voltmeter can be
separately used. The current meter can only be used here
with connected load as is shown by the imprint (measure the
current and voltage of the load as in Fig. 2b).

4 NOTES ON OPERATION

We recommend that you use Cobra4 Sensor-Unit Energy in
combination with a Wireless-Link, as the whole measurement
set-up is then separated from the PC. Parasitic currents to
the mains supply which could affect the measurement results
are hereby avoided. The same benefit is also given when the
Sensor-Unit is used with a laptop computer in battery opera­tion, i.e. detached from the mains power unit.
Operation of the USB-Link must be via an isolating trans­former which is not earthed when a computer with connection
to the mains (i.e. a commercial PC or a laptop connected via
a mains power unit) is to be used.
In combination with Cobra4-Wireless-Link, Cobra4-USB-Link,
Cobra4-Junior-Link and Cobra4-Mobile-Link, Cobra4-Sensor-

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Unit Energy fulfils the technical requirements that are com­piled in current European Community Guidelines. This in­strument is only to be operated under specialist supervision
in a controlled electromagnetic environment in research,
educational and training facilities (schools, universities, insti­tutes and laboratories).
This requires that operation must be in an environment where
no radio transmitting devices, such as mobile phones, are
used in the direct vicinity. Individual connecting leads are not
to be longer than 2 metres.
The instrument could be so influenced by electrostatic
charges and similar electromagnetic phenomena (HF, bursts,
indirect lightning discharges, etc.) that it no longer functions
within the given technical specifications.
The following measures reduce or prevent disturbing influ­ences:
Avoid fitted carpets; ensure potential equalization; carry out
experiments on a conductive, earthed surface; use screen­ing, screened cables. Do not operate high-frequency emitters
(radio equipment, mobile phones) in the immediate vicinity.

5 HANDLING

This section describes how to put Sensor-Unit Energy into
operation and use it to record measured data. To avoid fail­ure or improper operation, please read carefully through this
section and follow the instructions given.

5.1 Putting Cobra4 Sensor-Unit Energy into operation

Check that the current version of the measure software
package is installed and that the Cobra4 module has been
enabled (an at cost enabling code is required).
Updates of the software are free via:
www.phywe.com … download area.
Free updating of the software can also be made via the
measure DVD.

Connect Cobra4 Sensor-Unit Energy to the measured data
recording instrument of choice via the locking 15-pin plug
connection; the Sensor-Unit is immediately ready for use, as
power is supplied via the measured data recording instru­ment.

The combination of instruments is immediately ready for data
recording following the recognition of Sensor-Unit Energy by
the measured data recording instrument. Switching of meas­urement modes can be made either via the software (double
click on the instrument in Navigator) or via the menu (Mobile­Link).

Should the Sensor-Unit not be recognized by the measured
data recording instrument, then an update of the firmware of
the recording instrument is necessary. Current firmware can
also be found in the download area at www.phywe.com or on
the DVD.

For further information on the operation of measured data
recording instruments, refer to the appropriate operating in­structions.

6 TECHNICAL SPECIFICATIONS

Typical for 25°C
Operating temperature range: 5…40°C
Relative humidity: < 80%

Operating modes:
“u(t), i(t)”:

- Instantaneous values

- maximum scan rate 2000 Hz

“Energy DC”:

- Direct current circuit

- maximum measuring rate 4 Hz

“Energy AC”:

- Alternating current circuit

- maximum measuring rate 4 Hz

- up to 6000 Hz signal frequency

- output of real effective values of periodic signals (true

RMS)

Current and voltage inputs are galvanically separated

Voltage:

Measuring range 30 V:

Range: -30…30 V
Resolution: 0.01 V
Internal resistance: > 5 MΩ

Measuring range 1000 mV:

Range: -1000…1000 mV
Resolution: 0.1 mV
Internal resistance: > 200 kΩ

Accuracy: 1.5 % of final value
of measuring range
Damping: ± 2 dB (at 6000 Hz)
Overvoltage protection: up to 50 V

Current:

Measuring range 6 A:

Range: -6…6 A (6A for 3 min

until overcurrent pro-

tection is active)
Resolution: 0.001 A
Internal resistance: 33 mΩ
Overvoltage protection: max. 10 A, self reset

after approx. 5 min

Measuring range 600 mA:

Range: -600…600 mA
Resolution: 0.1 mA
Internal resistance: 2 Ω
Overvoltage protection: max. 2 A, self reset

Accuracy: 1.5 % of final value of
measuring range
Damping: ± 2 dB (at 6000 Hz)

Real power:

Measuring range 30 V, 6 A:

Range: 0…180 W
Resolution: 0.01 W

Measuring range 30 V, 600 mA:

Range: 0…18 W
Resolution: 0.001 W

Measuring range 1000 mV, 6 A:

Range: 0…6000 mW
Resolution: 0.1 mW

after approx. 5 min

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Measuring range 1000 mV, 600 mA:

Range: 0…600 mW
Resolution: 0.01 mW

Apparent power:

Measuring range 30 V, 6 A:

Range: 0…180 VA
Resolution: 0.01 VA
Measuring range 30 V, 600 mA:
Range: 0…18 VA
Resolution: 0.001 VA

Measuring range 1000 mV, 6 A:

Range: 0…6000 mVA
Resolution: 0.1 mVA

Measuring range 1000 mV, 600 mA:

Range: 0…600 mVA
Resolution: 0.01 mVA

Reactive power:

Measuring range 30 V, 6 A:

Range: 0…180 var
Resolution: 0.01 var

Measuring range 30 V, 600 mA:

Range: 0…18 var
Resolution: 0.001 var

Measuring range 1000 mV, 6 A:

Range: 0…6000 mvar
Resolution: 0.1 mvar

Measuring range 1000 mV, 600 mA:

Range: 0…600 mvar
Resolution: 0.01 mvar

Electric work:

Measuring range 100000 Ws:

Range: 0…100000 Ws
Resolution: 0.1 Ws

Measuring range 100000 Wh:

Range: 0…100000 Wh
Resolution: 0.1 Wh

Phase shift:
Range: -90…90 °
Resolution: 0.1 °

Frequency:
Range: 10…6000 Hz
Resolution: 0.1 Hz (< 1000 Hz)
1 Hz (> 1000 Hz)

Connector: Sub-D 15-pin
Current consumption: 100 mA
Dimensions (L x W x H): 110 x 70 x 30 mm
Weight: 110 g

8 NOTES ON THE GUARANTEE

We guarantee the instrument supplied by us for a period of
24 months within the EU, or for 12 months outside of the EU.
Excepted from the guarantee are damages that result from
disregarding the Operating Instructions, from improper han­dling of the instrument or from natural wear.
The manufacturer can only be held responsible for the func­tion and technical safety characteristics of the instrument,
when maintenance, repairs and alterations to the instrument
are only carried out by the manufacturer or by personnel who
have been explicitly authorized by him to do so.

9 WASTE DISPOSAL

The packaging consists predominately of environmentally
compatible materials that can be passed on for disposal by
the local recycling service.

Should you no longer require this product,
do not dispose of it with the household re­fuse.

Please return it to the address below for
proper waste disposal.

PHYWE Systeme GmbH & Co. KG
Abteilung Kundendienst (Customer Service)
Robert-Bosch-Breite 10
D-37079 Göttingen

Phone [phone]
Fax [phone]

7 PARTS SUPPLIED

The extent of delivery is as follows:

• Cobra4 Sensor-Unit Energy 12656-00

• Operating instruction

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www.phywe.de, © All rights reserved 12656-00 / 2311