PMK PKT 520A User manual
PKT 520A
High Impedance Passive Cable Divider
Instruction Manual
2
Copyright © 2015 PMK GmbH All rights reserved.
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
Fax: +49 (0) 6196 5927 - 939
Warranty
PMK GmbH warrants this oscilloscope accessory for normal use and operation within specifications for
a period of two (2) years from date of shipment and will repair or replace any defective product which was not
damaged 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.
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Declaration of Conformity PKT520A
(EC conformity marking)
The manufacturer declares,that this product is designed and manufactured in accordance with the requirements
of the specified Directives and Standards as listed below. The product carries the CE mark.
EU Directives covered by this declaration:
2006/95/EC Low Voltage Equipment Directive
2002/96/EC Waste Electrical and Electronic Equipment
2002/95/EC Restriction of use of certain Hazardous Substances and its revised version 2011/65/EU
The basis on which conformity is being declared:
EN61010-031:2002 + A1:2008
Safety requirements for hand-held probe assemblies for electrical measurement and test
RoHS and WEEE Statements and Confirmations issued by our vendors that no hazardous or restricted sub-
stances are used to manufacture components, parts and subassemblies for our products.
WEEE/ RoHS Directives
(EC conformity marking)
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
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IEC Measurement Categories PKT520A
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
CAT II performed 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 permanent 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.
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IEC Pollution Degrees PKT520A
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.
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Safety Information PKT520A
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 probe accessory ratings.
Do not apply any electrical potential to the probe input which exceeds the maximum ratings of the probe or the
accessories connected to it. In a combination always the lower rating / measurement category applies to both
probe and accessories connected to it.
Make sure to comply with the voltage versus frequency derating curve on page 8.
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.
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Handling PKT520A
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.
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Specifications PKT520A
Specifications that are not defined to be guaranteed are typical and 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 cable divider´s specified limits.
Electrical Specifications
Attenuation Ratio (1) 10:1 ± 2 % at DC
Voltage Coefficient 0.00025 %/V at DC
System Bandwidth 400 MHz (-3 dB)
Risetime 900 ps (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 2
Voltage Derating
Note that the max. input voltage
rating of the cable divider decreases as
the frequency of the applied signal
increases.
(1) Connect to oscilloscope with a input impedance of 1 MΩ± 1 %.
Typical voltage derating PKT520A
Measurement Category I
0
100
200
300
400
100K 1M 10M100M1G
Frequency [Hz]
Amplitude AC rms [V]Sinus
Typical Voltage Derating PKT 520A
Frequency [Hz]
Amplitude AC rms [V] Sinus
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Specifications PKT520A
Electrical Characteristics
Input Resistance (System) 10 MΩ± 1 %
Input Capacitance (System) 13 pF
Compensation Range 10 pF - 40 pF
Input coupling of the measuring instrument 1 MΩAC / DC
Input Impedance
Note that the Input Impedance of the
cable divider decreases as the frequency
of the applied signal increases.
Mechanical Characteristics
Weight (cable divider only) 70 g
Cable Length 2 m
Connection to Signal BNC
Environmental Specifications
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 % relative humidity for temperatures up to +31° C,
decreasing linearly to 40 % at +50° C
Typical input impedance PKT520A
10
100
1K
10K
100K
1M
10M
100M
10 1001K 10K 100K 1M 10M100M1G
Frequency [Hz]
|Z| [Ohm]
Typical Input Impedance PKT 520A
Frequency [Hz]
|Z| [Ohm]
10
Adjustment Procedures PKT520A
The cable divider can be adjusted for low frequency (LF) compensation and for high frequency (HF)
compensation.
LF Compensation
LF needs to be adjusted when the probe is connected to the oscilloscope 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 pooly com-
pensated cable divider clearly influences the overall system performance (cable divider + scope) and introduces
measurment errors resulting in inaccurate readings and distorted waveforms.
LF compensation is performed by connecting the cable divider 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.
undercompensated optimum overcompensated
NF Compensation
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Adjustment Procedures PKT520A
HF Compensation
HF needs to be adjusted when the cable divider is connected to the scope input the first time.
We recommend to use the following equipment for proper HF compensation:
Rectangular wave generator with a rise time faster than 700 ps, 50 Ohm feed-through.
HF adjustment is performed by connecting the cable divider to the rectangular wave generator.
Adjust trimmers (T1and T2) for optimum square wave response.
T1is used for rise time adjustment.
T2influences cable divider response time.
optimum
T1 T2
NF Compensation
180° T2
T1
Scope of Delivery
The following items are included in the scope of delivery. Please check the delivery for completeness. If any
item is missing, send a message to our service department and we will send you this item immediately.
Item Qty
Adjustment Tool T 1
Coding Rings (Set) 3x4 colors 1
Instruction Manual 1
PKT Cable Divider 1
Options
Additional silicone cable insulation and/or
reinforced strain relief available.
The accessories provided with the probe have been safety tested. Do not use
any other accessories than those “originally” provided.
M58-520-A00 Revision D - March 2015
890-010-912
Set Codingrings
3x4 Colors
018-292-024
Adjustment Tool
BERNSTEIN
018-292-007
Adjustment Tool T
Accessories PKT520A
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