PMK PHT 312-RO Manual de usuario

PHT 312-RO

Environmental Probe

Instruction Manual

Information in this publication supersedes that in all previously published material.

Specifications are subject to change without notice.

Manufacturer

PMK Mess- und Kommunikationstechnik GmbH

Königsteiner Str. 98

65812 Bad Soden, Germany Internet: www.pmk.de

Tel: +49 (0) 6196 5927 - 930 E-Mail: [email protected]

Fax: +49 (0) 6196 5927 - 939

Warranty

PMK GmbH warrants this oscilloscope accessory for normal use and operation within specifications for a peri-

od of two (2) years from date of shipment and will repair or replace any defective product which was not dama-

ged by negligence, misuse, improper installation, accident or unauthorized repair or modification by the buyer.

This warranty is applicable only to defects due to material or workmanship. PMK GmbH disclaim any other

implied warranties of merchantability or fitness for a particular purpose. PMK GmbH will not be liable for any

indirect, special, incidental, or consequential damages (including damages for loss of profits, loss of business,

loss of use or data, interruption of business and the like), even if PMK GmbH has been advised of

the possibility of such damages arising from any defect or error in this manual or product.

Declaration of Conformity PHT312-RO

(EC conformity marking)

The manufacturer declares the conformity of this product with the actual required safety standards in

accordance with the Low Voltage Directive (LVD) 2006/95/EC:

CEI/IEC 61010-031:2008 Safety requirements for electrical equipment

for measurement, control and laboratory use -

Part 031:

Safety requirements for hand-held probe

assemblies for electrical measurement and test

WEEE/ RoHS Directives

(EC conformity marking)

This electronic product is classified within the WEEE/ RoHS* category list as monitoring and control

equipment (category 9). Category 9 products are exempted from the restrictions under the scope of the

RoHS directive.

Your help and efforts are required to protect and keep clean our environment. Therefore return this

electronic product at the end of its life either to the Service Department of PMK Mess- und

Kommunikationstechnik GmbH or take care of separate WEEE collection and professional WEEE treatment

yourself. Do not dispose as unsorted municipal waste.

* EC Directives:

WEEE Directive 2002/96/EC - Waste Electrical and Electronic Equipment

RoHS Directive 2002/95/EC - Restriction of the use of certain Hazardous Substances

in Electrical and Electronic Equipment

IEC Measurement Categories PHT312-RO

Definitions and Examples (Clause 6.5.2)

Measurement Category I Definition: Measurement category I is for measurements performed

on circuits not directly connected to a mains supply.

Examples: Measurements in circuits not derived from a mains supply

and specially protected ( internal ) circuits derived

from a mains supply. In the latter case, transient stresses

are variable; for that reason it is required that the transient

withstand capability of the equipment is made known to

the user.

Measurement Category II Definition: Measurement category II is for measurements performed

CAT II on circuits directly connected to the low voltage

installation.

Examples: Household appliances, portable tools and similar

equipment.

Measurement Category III Definition: Measurement category III is for measurements

CAT III performed in the building installation.

Examples: Measurements on distribution boards, circuit breakers,

wiring including cables, bus-bars, junction boxes, switches,

socket-outlets in the fixed installation and equipment for

industrial use like for example stationary motors with per-

manent connection to the fixed installation.

Measurement Category IV Definition: Measurement category IV is for measurements

CAT IV performed at the source of the low-voltage installation.

Examples: Electricity meters and measurements on primary over

current protection devices and and ripple control units.

IEC Pollution Degrees PHT312-RO

Definitions (Clause 3.5.6 )

Pollution Degree 1 No POLLUTION or only dry, non conductive POLLUTION.

NOTE: The POLLUTION has no influence.

Pollution Degree 2 Only- non conductive POLLUTION. Occasionally, however, a temporary

conductivity caused by condensation must be accepted.

Pollution Degree 3 Conductive POLLUTION occurs or dry, non-conductive POLLUTION occurs

which becomes conductive due to condensation which is to be expected.

IEC Safety Symbols

The following symbols may appear on the product or in this instruction manual:

Caution, risk of danger. Refer to manual.

Caution, risk of electric shock.

Earth (ground) TERMINAL.

Grounding the Probe PHT312-RO

Connect the probe to the oscilloscope input and connect the ground lead to earth ground before performing any

measurements. Note that all accessible metal parts are connected to the BNC instrument connector (GND),

except for the probe tip and the BNC centre-conductor.

The PHT312-RO is designed for ground-referenced measurements only.

Specifications

This datasheet supersedes all previously published material. Specifications that are not marked as guaranteed

are published as general information to the user. The instrument should have warmed-up for at least 20 minutes

and the environmental conditions do not exceed the probe `s specified limits.

Electrical Specifications

Attenuation Ratio (1) 10:1 ± 2 % at DC

Voltage Coefficient 0.00025 %/V at DC

System Bandwidth 350 MHz (-3 dB)

Probe Risetime 1 ns (10 % - 90 %)

Maximum Rated Input Voltage

Measurement Category I: 400 V rms

1250 V transient overvoltage

Measurement Category II: 300 V rms CAT II

Pollution Degree (3) 2

Voltage Derating

Note that the max. input voltage

of the probe decreases as

the frequency of the applied

signal increases.

(1) Connected to oscilloscope with an input impedance of 1 MΩ± 1 %.

Typical Voltage Derating PML712

Measurement Category I

100

200

300

400

100k 1M 10M100M1G

Frequency [Hz]

Amplitude AC rms [V]Sinus

Typical Voltage Derating PHT 312

Frequency [Hz]

DC incl. AC peak [V] Sinus

Specifications PHT312-RO

Electrical Characteristics

Input Resistance (System) 4.4 MΩ(± 1 %)

Input Capacitance (System) 20 pF

Compensation Range 10 pF - 25 pF

Input Coupling of the Measuring Instrument 1 MΩAC / DC

Input Impedance

Note that the input impedance of

the probe decreases as the frequency

of the applied signal increases.

Mechanical Characteristics

Weight (probe) 93 g

Cable Length 2 m

Probe Tip Diameter 5 mm

Environmental Specifications

BNC Connector and (*) marked parts:

Altitude operating up to 2000 m

non-operating up to 15000 m

Temperature Range operating 0° C to +50° C

non-operating -40° C to +71° C

Maximum Relative Humidity operating 80 % RH for temperatures up to +31° C,

decreasing linearly to 40 % at +50° C

Probe Head and Cable Assembly only:

Altitude operating up to 2000 m

non-operating up to 15000 m

Temperature Range operating -55° C to +155° C

non-operating tba

Maximum Relative Humidity operating tba

100

10k

100k

10M

100M

10 100 1k 10k 100k 1M 10M 100M1G

Typical Input Impedance PHT 312

Frequency [Hz]

|Z| [Ohm]

Safety Information PHT312-RO

To avoid personal injury and to prevent fire or damage to this product or products connected to it, review and

comply with the following safety precautions. Be aware that if you use this probe assembly in a manner not

specified the protection this product provides may be impaired.

Only qualified personnel should use this probe assembly.

Use only grounded instruments.

Do not connect the probe ground lead to a potential other than earth ground. Always make sure the probe and

the measurement instrument are grounded properly.

Connect and disconnect properly.

Connect the probe output to the measurement instrument and connect the ground lead to earth ground before

connecting the probe to the circuit under test. Disconnect the probe input and the probe ground lead from the

circuit under test before disconnecting the probe from the measurement instrument.

Observe probe and probeaccessory max. input values.

Do not apply any electrical potential to the probe input which exceeds the maximum values of the probe or

connected accessories as stated in this manual. For any combination of probe and connected accessory, the

lower value applies to both probe and accessory.

Make sure to comply with the voltage versus frequency derating curve on page 6.

Keep away from live circuits.

Avoid open circuitry. Do not touch connections or components when power is present.

Do not operate with suspected failures.

Refer to qualified service personnel.

Indoor use only.

Do not operate in wet/damp environment. Keep product surfaces dry and clean.

Do not operate the product in an explosive atmosphere.

Adjustment Procedures PHT312-RO

The probe can be adjusted for low frequency (LF) compensation and for high frequency (HF) compensation and

DC dividing ratio.

DC Adjustment

In order to provide highest accuracy over the voltage range this probes dividing ratio is factory adjusted using

200 VDC source and a measuring device with a precision input impedance of 1MΩ ± 0.01 %.

Factory calibration traceable to DAkkS is available on request.

LF Compensation

LF needs to be adjusted when the probe is connected to the scope input the first time. LF compensation matches

the probes cable capacitance to the oscilloscope input capacitance. This matching assures good amplitude

accuracy from DC to upper bandwidth limit frequencies. A poorly compensated probe clearly influences the

overall system performance (probe + scope) and introduces measurement errors resulting in inaccurate readings

and distorted waveforms.

LF compensation is performed by connecting the probe to the CAL – output on the oscilloscope front panel and

adjusting the LF compensation trimmer to optimum square wave response. For clarification see below figures.

HF Compensation

HF needs to be adjusted when the probe is connected to the scope input

the first time.

HF adjustment is performed by connecting the probe to the rectangular

wave generator with a fast rise time. Adjust trimmers for optimum

square wave response.

undercompensated optimum overcompensated

optimum

LF Compensation HF Compensation

DC Adjustment

Handling PHT312-RO

Handle with care especially when fitted with the extra thin and sharp spring contact tip to avoid any

injury. Note that the probe cable is a sensitive part of the probe. Do not damage

through excessive bending or pulling. Avoid mechanical shock to this product in general to

guarantee accurate performance and protection.

Maintenance

Cleaning

To clean the exterior of the probe use a soft cloth moistened with either distillated water or isopropyl alcohol.

Before use allow the probe to dry completely.

Changing the Probe Tip

To change the probe tip use pliers to grip and pull it carefully straight out of its contact socket, along the

axis of the probe. Do not grip the white plastic insulator or the housing with pliers, because the tip could be

squeezed and cannot be removed and respectively the probe could be damaged.

If the probe tip is removed, the new tip can be inserted with pliers into the contact socket, along the axis

of the probe. In order to insert the probe tip completely into the housing, press the probe tip against a hard

surface carefully.

Use pliers to grip and pull the probe tip carefully out

of its contact socket.

Do not grip the white plastic insulator or the probe

housing with pliers.

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