2799539 - Phoenix Contact - Datasheet.Live

Contents

1. Short Description

2. Scope of delivery

3. Functional description

3.1.Choice of FO adapter

3.2.Switching on the measuring instrument

3.3.Displaying measured value

3.4.Setting the wavelength

3.5.Choosing the method of measuring

3.6.Saving a measured value

4. Measuring technique

4.1.Determining the optical power reserve of a

transmission path

4.2. Measuring the transmission capacity

4.3. Determining cable attenuation based on

DIN EN 186 000, method 7

4.4. Determining the attenuation per kilometer of

FO ﬁber

5. Sample applications for INTERBUS

5.1.Determining the incoming emissivity in

an INTERBUS system

5.2.Measuring the transmission capacity of

INTERBUS devices

6. The basics of FO measurement technology

6.1.Method of measurement

6.2.Effects of ageing

6.3.The effects of temperature

6.4.Overview of the various FO types

7. Technical data

7.1.Measuring instrument

7.2.Adapter ﬁbers

7.3.Calibration service

Fig. 1

PSM-FO-Powermeter

FO measuring instrument

Headquarters:

Phone +49-(0) 52 35-3-00 • Fax +49-(0) 52 35-3-4 1200 • http://www.phoenixcontact.com

1. Short Description

The optic ﬁber portable power meter

The PSM-FO-Powermeter optic ﬁber portable power

meter is used to carry out optical capacity measure-

ments. Path attenuations and the remaining system

reserve in FO transmission systems are thus simple to

determine.

The case contains an active-power meter and all the

necessary instrument leads and adapters for checking

polymer, HCS and glass ﬁber paths having an F-SMA

or B-FOC connection.

2. Scope of delivery

PSM-FO-Powermeter

FO measuring instrument

OPM 4 measuring instrument with 9 V battery

F-SMA adapter

B-FOC (ST



) adapter

50/125µm glass ﬁber with B-FOC (ST



) connector

Desig.: FO 50/125 ST

50/125µm glass ﬁber with F-SMA connector

Desig.: FO 50/125 FSMA

200/230µm HCS ﬁber with F-SMA connector

Desig.: HCS 200/230 FSMA

980/1000µm polymer ﬁber with F-SMA connector

Desig.: POF 980/1000 FSMA

F-SMA coupler

B-FOC coupler

Operating instructions

Hard case

3. Functional description

3.1. Choice of FO adapter

Adapters for F-SMA and B-FOC plug connectors are

included in the scope of delivery of the measuring

instrument. In the standard version, the F-SMA adapter

is screwed on. To make measurements on B-FOC plug

connectors, screw on the enclosed adapter.

Fig. 2

OPM 4

Polym erfaser G lasfaser F-SMA

HCS-Faser B-FOC Adapter M eßgerät G lasfaser B-FO C

Kupplungen

HCS fiber B-FOC adapter Glass fiber B-FOC

Measuring

instrument

CouplersGlass fiber F-SMAPolymer fiber

OPTICAL POWER METER

OPM 4

dBm

OFF

SET

REF

660 850 BAT

780 REF

dBm

Fig. 3

OPTICAL POWER METER

OPM 4

dBm

OFF

SET

REF λ

660 850 BAT

780 REF

dBm

Displaying

Method of

On/off switch

FO adapter

Choosing wavelength

Saving measured

measured value

measurement value

PHOENIX CONTACT page 2 of 11

PSM-FO-Powermeter

FO measuring instrument

Keep all the optical connections free of

grease and dust. Apart from these impuri-

ties, scratches on the surface of the plug

connectors can also impair the accuracy

of the measurement. Please replace the

protective caps after use and clean all

optical surfaces with a soft cloth if neces-

sary.

Fig. 4

F-SMAB-FOC



is a registered trademark of AT & T

PHOENIX CONTACT page 3 of 11

OPTICAL POWER METER

OPM 4

dBm

OFF

SET

REF λ

660 850 BAT

780 REF

dBm

Fig. 5

OFF

3.2. Switching on the measuring instrument

Press the

ON/OFF

button to turn the PSM-POWERME-

TER on or off.

In order to extend the life of the battery, the device has

an automatic switch-off function that switches it off ﬁve

minutes after the button has been pressed. This auto-

matic function can be deactivated when the device is

switched on by pressing the

ON/OFF

button until

‘ . P’

appears on the display (approx. 3 s).

3.3. Measured value display

The following are shown on the display:

- measured value in dBm/dB

- wavelength set in nm

- overshooting or undershooting of measuring range

(HI/LO)

- for attenuation measurement: REF

- for too low a battery voltage: BAT

3.4. Setting the wavelength

You can select the wavelength range to be measured

with the

button. By brieﬂy pressing the

button, the

next wavelength range is selected in the order of 660

nm - 780 nm - 850 nm.

The wavelength of a transmitter can be found in the

technical data of the device.

Measurements made with the wrong wavelength set

result in incorrect measured values.

3.5. Choosing the method of measuring

By pressing this button brieﬂy, you switch between

power measurement (display

dBm

) and attenuation

measurement (display

and

REF

Explanations on these methods of measuring can be

found in chapter 5.

3.6. Saving a measured value

K eep the

SET REF

button pressed until

HOLD

appears

on the display (approx. 3 s), to save the current measu-

red value. It then also switches over automatically to

attenuation measurement.

By brieﬂy pressing the

SET REF

button, the sa v ed mea-

sured value is displayed for approx. 3 seconds.

The saved value is not lost even after the device has

been switched off.

PSM-FO-Powermeter

FO measuring instrument

Fig. 6

660 850 BAT

780 REF

dBm

Fig. 7

OPTICAL POWER METER

OPM 4

dBm

OFF

SET

REF λ

660 850 BAT

780 REF

dBm

Fig. 8

dBm

OPTICAL POWER METER

OPM 4

dBm

OFF

SET

REF λ

660 850 BAT

780 REF

dBm

Fig. 9

OPTICAL POWER METER

OPM 4

dBm

OFF

SET

REF λ

660 850 BAT

780 REF

dBm

SET

REF

4. Measuring technique

4.1. Determining the optical power reserve of a transmission path

Target:

To measure the optical power reserve of the transmission path at start-up or in the event of a fault. Since a trans-

mission path generally consists of two FO ﬁbers, the power reserve must be determined for both ﬁbers.

The power reserve is the difference between the incoming emissivity at the receiver and the receiver sensitivity of

the device. The receiver sensitivity can be found in the technical data of the device. The power reserve should be

at least +3 dB in glass ﬁber installations and at least +4.5 dB when HCS ﬁber or polymer ﬁber is used

Procedure:

1. Connect the tr ansmitter so that

continuous light

is emitted. Information on this can be found in the oper ating

instructions of the device.

2. Set the measuring instrument to the correct wavelength range and select the suitable FO-adapter

(ST



or F-SMA)

3. Select

dBm

for power measurement

4. Connect the incoming ﬁber to the measuring instrument

5. The optical transmission capacity at the end of the path appears on the display in

dBm

6. Now calculate the difference between receiver sensitivity and measured transmission capacity

7. Repeat steps 4 and 5 for the second ﬁber. The smaller value determines the optical power

reserve of the transmission path.

This value applies for new devices and measurements with an ambient temperature of 25 °C. For minimum values for existing

systems and higher ambient temperatures, see 6.2. Effects of ageing, and 6.3. The effects of temperature (see also installation guideline).

PHOENIX CONTACT page 4 of 11

PSM-FO-Powermeter

FO measuring instrument

OPM 4

OFF

SET

REF

dBm

OPM 4

OFF

SET

REF

dB m

Faser 2

LW L-Kabel

M essung 1M essung 2

Sender 1

Sender 2

Faser 2Faser 1

Faser 1

24 V DC 24 V DC

Fig. 10

24 V DC 24 V DC

FO cable

Fiber 2 Fiber 1

Fiber 1 Fiber 2 Transmitter Transmitter

Measurement 1 Measurement 2

PSM-FO-Powermeter

FO measuring instrument

PHOENIX CONTACT page 5 of 11

4.2. Measuring the transmission capacity

Target:

To check whether the minimum speciﬁed transmission capacity is being emitted b y measuring the optical transmis-

sion capacity. Information on this can be found in the technical data of the device

Procedure:

1. Connect the transmitter so that

continuous light

is emitted. Instructions can be found in

the operating instructions of the device

2. Taking into consideration the type of connector and ﬁber dimensions

, choose the reference ﬁber

to match the device

3. Set the correct wavelength range. The wavelength of the device can be found in the

technical data of the device

4. Select

dBm

for power measurement

5. The transmission capacity of the module appears on the display in

dBm

6. To evaluate the measured value, compare the transmission capacity displayed with the technical data

This value applies for new devices and measurements with an ambient temperature of 25 °C. For minimum values for existing

systems and higher ambient temperatures, see 6.2. Effects of ageing, and 6.3. The effects of temperature.

A cross-reference table for wavelength, ﬁber type and connector type can be found under 6.4. Overview of the ... .

OPM 4

OFF

SET

REF

24 V DC

Referenzfaser

Fig. 11

24 V DC

Reference fiber

PHOENIX CONTACT page 6 of 11

PSM-FO-Powermeter

FO measuring instrument

4.3. Determining cable attenuation based on DIN EN 186 000, method 7

Target:

Checking the attenuation of a reference ﬁber

Concept:

Using method 7, the speciﬁc attenuation of the enclosed reference ﬁbers, for example, can be checked. With this

method, the complete attenuation of a cab le ﬁtted with connectors is measured. A measuring method by which the

pure ﬁber attenuation (without connector) is determined can be found under 4.4.

Procedure:

1. Select a suitable transmitter by wavelength and type of connector

2. Connect the transmitter so that continuous light is emitted

3. Measure the transmission capacity as in 4.2., Measuring the transmission capacity

4. Save the measured value by keeping the

SET REF

button pressed for some time (approx. 3 seconds)

5. With the aid of the enclosed coupler, connect the cable to be measured to the measuring cable.

6. The value displayed is the cable attenuation in

7. Turn the cable to be measured round and repeat steps 5 and 6.

8. When checking a reference ﬁber, both values must be within the given tolerance.

(see Technical data, 7.2.)

beliebige Faser

OPM 4

OFF

SET

REF

Sender

beliebige Faser

OPM 4

OFF

SET

REF

Sender

Kupplung

zu m es sende Faser

Fig. 12

A cross-reference table for wavelength, ﬁber type and connector type can be found under 6.4. Overview of the ... .

Any type of fiber

CouplerCouplerCouplerCoupler

Any type of fiber Fiber to be measured

Trans-

mitter

Trans-

mitter

PSM-FO-Powermeter

FO measuring instrument

PHOENIX CONTACT page 7 of 11

4.4. Determining the attenuation per kilometer of FO ﬁber

Target:

To check the quality of the ﬁber by means of comparative measurement. This method is only suited for HCS and

glass ﬁbers; the kilometric attenuation of polymer ﬁbers also depends on the length of the cable to be measured.

Concept:

The comparison measurement is a method of determining the typical kilometric ﬁber attenuation by appro ximation.

The attenuation of an existing ﬁber is compared with a 1m long reference ﬁber. The reference ﬁber must have the

same ﬁber diameter as the ﬁber to be measured.

The accuracy of the comparative measurement depends largely on how the connector is assembled. Since

assembly is subject to wide tolerances, determining the typical ﬁber attenuation is not to be recommended below

the following lengths:

Glass ﬁber: approx. 500m

HCS ﬁber: approx. 100 m

Procedure:

1. Select a suitable reference ﬁber by ﬁber diameter and type of connector

2. Select a suitable transmitter by wavelength and type of connector

3. Connect the transmitter so that continuous light is emitted

4. Measure the transmission capacity as in 4.2. Measuring the transmission capacity

5. Save the measured value by keeping the

SET REF

button pressed for some time (approx. 3 seconds)

6. Now replace the reference ﬁber by the path to be measured

7. The attenuation of the cable to be measured is now displayed in dB

8. The typical ﬁber attenuation is calculated as follows:

α = ––––––––––––––––––––––––––––––––––––––––––––––––––––––––– • 1000

Example: The typical attenuation of a 1500 m long glass ﬁber cable is to be determined:

α = ––––––––––– • 1000 = 2,8 –––

OPM 4

OFF

SET

REF

dB m

Sender

OP M 4

OFF

SET

REF

dBm

Sender

zu m essende Faser

Vergleichsfaser

Fig. 13

Fiber to be measured

Reference fiber

Trans-

mitter

Trans-

mitter

4.2 dB

1500 m - 1 m dB

Attenuation [dB] displayed

Length of the ﬁber to be measured [m]- Length of the reference ﬁber [m]

PHOENIX CONTACT page 8 of 11

PSM-FO-Powermeter

FO measuring instrument

5. Sample applications for INTERBUS

5.1. Determining the incoming emissivity in an INTERBUS system

Target:

To determine the emissivity in a system at the end of an FO cable.

Procedure:

1. Interrupt the bus directly after the master

2. Screw the F-SMA connector off the receiver of the device and connect it to the

measuring instrument

3. Set the measuring instrument to a wavelength range of 660 nm

4. Select dBm for power measurement

5. The optical level measured appears on the display in dBm

6. To evaluate the value displayed, consult the FO installation guidelines

for the INTERBUS system

7. Measure the incoming light capacity in both ﬁbers of the cable upstream of the receiving

device

NTER

OPM 4

OFF

SET

REF

dB m

NTER

OPM 4

OFF

SET

REF

dB m λ

Faser 1 Faser 2

LW L-Kabel

M essung 1M es s ung 2

In order to evaluate the optical data trans-

mission in INTERBUS systems, points

5.1., 5.2. and the enclosed INTERBUS

installation guideline are relevant.

FO cable

Fiber 1 Fiber 2

Measurement 1 Measurement 2 Fig. 14

INTERBUS

PHOENIX CONTACT page 9 of 11

PSM-FO-Powermeter

FO measuring instrument

5.2. Measuring the transmission capacity of INTERBUS devices

Target:

To determine the transmission capacity of a module.

Procedure:

1. Interrupt the bus directly after the master

2. Connect the enclosed polymer ﬁber cable1) between bus device and measuring instrument.

3. Set the measuring instrument to a wavelength range of 660 nm

4. Select dBm for power measurement

5. The optical level measured appears on the display in dBm

6. Measure both transmitters of the bus device (incoming and outgoing remote bus)

7. To evaluate the transmission capacity measured, please consult the technical data of the device

or the FO installation guidelines.

1) The polymer ﬁber cable supplied is a reference cable (see 7.2. Adapter ﬁbers)

Referenzfaser

OPM

SET

REF

NTER

OPM

OFF

SET

REF

Referenzfaser

M essung 1 M essung 2

Sender 1 Sender 2

Additional information on measurements

in INTERBUS systems can be found

in the enclosed FO installation guidelines.

Fig. 15

Measurement 1

Measurement 2

Trans-

mitter 1

Trans-

mitter 2

Reference fiber Reference fiber

OPTICAL POWERMETER

OPM 4

FF FF FF

INTERBUS

PSM-FO-Powermeter

FO measuring instrument

PHOENIX CONTACT page 10 of 11

6. The basics of FO measurement technology

6.1. Method of measurement

Two different methods of measurement are used in this manual:

• Power measurement

This method of measurement is used whenever a light source (with or without transmission path) are to be evalua-

ted. This can be either measurement at the end of a transmission path (see 5.1) or direct measurement of a trans-

mitter using a reference ﬁber (see 5.2).

Power measurement is always carried out in dBm or mW. For measurements in dBm, 0 dBm correspond to an out-

put of 1 mW.

The PSM-FO-POWERMETER displays the optical capacity in the practical form of dBm. Should it be necessary to

convert dBm to mW, this is done following the equations below:

a) when the power is known in dBm b) when the power is known in mW

P(mW) = 1 mW • 10 P(dBm) = 10 dBm • log

• Attenuation measurement

Attenuation measurement is used to determine the attenuation of a transmission path (see 4.1. or 4.2.). This at-

tenuation is not dependent on the capacity of the light source used.

The difference in power between the input power and the output power at the end of the transmission path is

determined in dB. Since the output power is smaller than the input power, the attenuation ia always positive (> 0).

attenuation a (dB) = Ptransmitter (dBm) - Preceiver (dBm)

6.2. Effects of ageing5)

During operation, the optical transmission capacity drops due to ageing of the semi-conductor used. For this rea-

son, the transmission capacity drops by 1.0 dB in the ﬁrst year and by approx. 0.2 dB per year in the subsequent

years. This reduction in transmission capacity is compensated for by the system reserve.

6.3. The effects of temperature

The semi-conductors of FO transmit and receive elements are inﬂuenced by the ambient temperature. The values

given in the technical data for transmission capacity and receiver sensitivity generally refer to an ambient temper a-

ture of +25 ˚C.

With an ambient temperature of +50 ˚C, there is a reduction in transmission capacity of approx. 1.2 dB and a

reduction in receiver sensitivity of approx. 1.6 dB. Since there is a strong interdependency between temperature

and components, the values given here are merely guidelines.

In addition to the drops mentioned, wavelength drift causes a reduction of approx. 1.4 dB when polymer ﬁber is

used.

The reduction values listed here have already been fully accounted for

in the maximum transmission distances given by Phoenix Contact.

5) The values given here apply to transmitters with a wavelength of 660 nm using polymer ﬁber cable.

If other wavelengths or types of ﬁber are used, lower values apply.

The reduction values listed here have already been fully accounted for

in the maximum transmission distances given by Phoenix Contact.

P(mW)

1 mW

P(dBm)

10 dBm ( ))(

PSM-FO-Powermeter

FO measuring instrument

PHOENIX CONTACT page 11 of 11

6.4. Overview of the various FO types

7. Technical Data

7.2. Adapter ﬁbers

The insertion losses of the ﬁbers have been determined before delivery. We advise checking the attenuation at

regular intervals as described in 4.5.

7.3. Calibration service

The PSM-POWERMETER is calibrated before delivery. The precision of the instrument can, however, diminish

with time. We therefore advise you to have the measuring instrument calibrated again annually by Phoenix Con-

tact.

If you are interested, please contact our Service Center :

Phoenix Contact GmbH & Co.

Service Center Phone: ++49/52 35 - 3 - 00

Flachsmarktstraße 8-28 Fax: ++49/52 35 - 3 - 4 10 60

D-32825 Blomberg

Type of ﬁber Max. distance Typ. wavelength Fiber classiﬁcation

(diameter) Type of

connector

Polymer ﬁber up to 70m

(depends on

device) 660 nm 980/1000 µm F-SMA

HCS ﬁber up to 500m

(depends on

device) 660 nm 200/230 µm F-SMA

Glass ﬁber up to 3500m 850 nm 50/125 µm or

62.5/125 µm B-FOC (ST) or

F-SMA

7.1. Measuring instrument

Light-sensitive element:

Wavelengths

Measuring range

Precision

Resolution of display

Service life of battery

Ambient temperature range

Storage temperature range

Relative humidity:

Dimensions (H/W/D)

Weight

silicon cell

660 nm, 780 nm, 850 nm

-70 dBm to +6 dBm

+/- 0.25 dB

0.01 dB

approx. 60 h with 9 V alcaline battery

0˚C to +45 ˚C

-30˚C to +60 ˚C

max. 95 % (non-condensing)

115/70/25 mm

180 g

Fiber Plug Diameter of the

ﬁbers Wavelength

range Insertion loss

based on method 7 Designation

Glass B-FOC (ST) 50/125 µm 850 nm 0.3 ... 0.8 dB FO 50/125 ST

Glass F-SMA type 905 50/125 µm 850 nm 0.35 ... 0.85 dB FO 50/125 FSMA

HCS F-SMA type 905 200/230 µm 660 nm & 850 nm 1.0 ... 1.5 dB HCS 200/230 FSMA

Polymer F-SMA type 905 980/1000 µm 660 nm 1.5 ... 2.0 dB POF 980/1000 FSMA

 PHOENIX CONTACT 20.01.99 TNR: 5087581-00 http://www.phoenixcontact.com