Fluke 85RF Bedienungsanleitung


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85RF II
High Frequency Probe
Instruction Sheet
Introduction
The 85RF II High Frequency Probe (the Probe) transforms a
dc voltmeter into a high frequency (100 kHz to 500 MHz) ac
voltmeter. Conversion from ac to dc is done on a one-to-one
basis and includes a range of 0.25 V rms to 30 V rms. The
Probe’s dc output is calibrated to be equal to the rms value
of a sine wave input.
Safety
Symbol Description
W See Instruction Sheet.
X Hazardous voltage.
~
Do not dispose of this product as
unsorted municipal waste. Go to Fluke’s
website for recycling information.
WXWarning
To prevent possible electrical shock, fire, or personal
injury:
• Examine the case before you use the Product.
Look for cracks or missing plastic. Carefully
look at the insulation around the terminals.
• Limit operation to the specified measurement
category, voltage, or amperage ratings.
• Do not touch voltages >30 V ac rms, 42 V ac
peak, or 60 V dc.
• Do not use the Product around explosive gas,
vapor, or in damp or wet environments.
• Do not use and disable the Product if it is
damaged.
• Use the Product only as specified, or the
protections supplied by the Product can be
compromised.
• Do not exceed the Measurement Category (CAT)
rating of the lowest rated individual component
of a Product, Probe, or accessory.
• Keep fingers behind the finger guards on the
Probes.
• Do not connect directly to mains.
PN 4096837
September 2011, Rev. 1, 12/11
©2011 Fluke Corporation, Printed in the U.S.A. All product names are
trademarks of their respective companies. Specifications are subject to change
without notice.
®
Specifications
AC to DC ratio: 1:1
Ratio accuracy: (at 25 MHz and loaded with 10 Me
e
e
ee )
Above 0.5V: ± 0.5 dB
Below 0.5V: ± 1.0 dB
Add ±0.2 dB in RF fields of 1 V/m to 3 V/m
Frequency response: (Relative to 25 MHz)
100 kHz to 80 MHz ±0.5 dB
*80 MHz to 200 MHz ±2.0 dB
*200 MHz to 300 MHz ±3.5 dB
*300 MHz to 400 MHz ±4.5 dB
*400 MHz to 500 MHz ±5.5 dB
*Referred to high and low inputs at Probe tip.
Extended frequency response:
Useful for relative measurements from
20 kHz to 700 MHz.
Response:
Responds to the peak value of an input and is calibrated
to read rms value of a sine wave.
Voltage range: 0.25 V rms to 30V rms
Maximum input voltage: 30 V rms, 200 V dc
Input capacitance: Approximately 9 pF
Temperature range:
Operating: +10 °C to +35 °C
Storage: -40 °C to +75 °C
Humidity: <90 % R.H.
Output connector:
Fits standard 0.75 inch dual banana connectors
Accessory:
BNC to Probe Adapter, P/N 574756
Pollution degree: 2
Operating altitude: 3000 m
Warranty: 1 year
Voltmeter Compatibility
The 85RF II can be used with a dc voltmeter that has an
input resistance of 10 Me, ±10 %. Voltmeters with higher
input resistances are usable if an external shunt is put
across the input terminals. The shunt value is set to
decrease the input resistance to 10 Me.
Operation
To operate the 85RF II Probe:
1. Connect the Probe output to a compatible voltmeter with
an applicable shunt (if necessary.) The Probe’s output low
must be connected to voltmeter low.
2. Set a voltage range (1 V dc reading for each 1 V rms
Probe input).
3. Connect the input low (clip lead or tip shield) to earth
ground.
WXWarning
Input low is intended to be connected to earth
ground. To prevent electrical shock, input low
(clip lead or tip shield) must be connected to
potentials of less than 30 V ac, 42 V peak, or
60 V dc.
Frequency Measurements
Frequencies less than 100 MHz
To measure frequencies less than 100 MHz:
1. Ground the 4-inch clip lead supplied with the Probe.
2. Touch the Probe tip to the circuit under test.
Frequencies greater than 100 MHz
To measure frequencies greater than 100 MHz:
1. Ground the 4-inch clip lead supplied with the Probe.
2. Touch the Probe tip to the circuit under test.
Note
Measurements above 100 MHz must be made with
minimum cable lengths and a terminated 50
e
system.
One inch or less of non-terminated coaxial cable (such as
a BNC adapter and 50
e
termination) is required for
measurements up to 300 MHz.
Frequencies greater than 300 MHz
To measure frequencies greater than 300 MHz:
1. Ground the 4-inch clip lead supplied with the Probe.
2. Touch the Probe tip to the circuit under test.
Note
Measurements above 300 MHz must have the Probe tip
and tip shield (input high and low) touch the circuit under
test to realize the rated accuracy of the Probe. Lead
lengths less than 1-inch can cause substantial errors.


Produktspezifikationen

Marke: Fluke
Kategorie: Nicht kategorisiert
Modell: 85RF

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