Fluke 85RF II Bedienungsanleitung

English

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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

WSee Instruction Sheet.

XHazardous 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

trademarks of their respective companies. Specifications are subject to change

without notice.

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Specifications

AC to DC ratio: 1:1

Ratio accuracy: (at 25 MHz and loaded with 10 Me)

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.

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Page 3

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

system.

One inch or less of non-terminated coaxial cable (such as

a BNC adapter and 50

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.

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WCaution

To prevent Probe damage, the dc component of

the input signal (includes transients) must not be

more than 200 V dc. Maximum Probe input is

30 V ac rms and 200 V dc. Measurements of an ac

signal riding a dc voltage can be made up to 200 V

dc. The input capacitor charges to the peak value

of ac plus dc. If the dc level is then changed by

more than 200 V dc, the transient can possibly

damage the Probe. The chance of damage can

prevented if the input capacitor is discharged at

the end of each measurement. Momentarily touch

Probe tip to the ground clip to discharge the

capacitor.

Performance Test/Calibration

The performance and calibration test is a verification test to

make sure that the 85 RF II is functional and correctly

calibrated. Use the procedure as an acceptance test and/or

calibration procedure (the Probe has one adjustment which

is R2). The recommended calibration interval is one year.

Note

If the Probe cannot be calibrated to the specifications in this

document, the Probe could be damaged and require

replacement or repair. Contact Fluke for instructions.

1. Configure the equipment as shown in Figure 2. Use the

leveled sine function of the scope output to set the AC

Calibrator signal generator for 1 V rms at 25 MHz and the

DMM to measure 1 V dc.

E2 C1

CR1

WP1

WP2

CR3

MP1 E1

CR2

220P

AGND

STANDOFF CLIP

BAT41ZFILM

330P

1.82M

500K

1.3M

1N4448W

gsk001.eps

Figure 1. Schematic Diagram

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Page 5

Fluke 85RF Probe under test

Required Equipment List

The following equipment (or equivalent) is required for

testing the performance of the 85RF II:

Equipment Type Recommended Model

AC Calibrator Fluke 5520A-SC600

50-Ohm Feed Thru

Termination

JFW Industries P/N 50L-001

BNC Jack to Banana

Plug Adapter

Pomona P/N 1269

BNC to Probe Adapter Fluke P/N 574756

Digital Multimeter,

3-1/2 Digit (DMM)

Fluke 87V

BNC Jack to Jack

Adapter

Pomona 3283

gsk002.eps

Figure 2.

Equipment Configuration for Performance Test

2. The DMM will read between 0.950 V dc and 1.050 V dc. If

the Probe is functional but is not in these limits,

disassemble the Probe (refer to the “Probe Disassembly”

Section in this Instruction Sheet) and adjust R2 for a DMM

measurement between 0.990 V dc and 1.010 V dc.

Reassemble the Probe.

3. Move the unit in test to the Normal output of the calibrator

and decrease the output level to 0.250 V rms and 1 MHz.

The DMM will read between 0.223 V dc and 0.280 V dc.

4. Set the AC Calibrator to STDBY, decrease the frequency

to 100 kHz and increase the voltage to 30 V ac rms. (Do

not increase the voltage to more than 30 V ac.)

5. Set the AC Calibrator switch to OPER. The DMM will read

between 28.3 V dc and 31.8 V dc.

6. Move the unit in test back to the scope output and set the

level sine to 1 V rms 160 MHz. The DMM will read

between 0.9 V dc and 1.12 V dc. Increase the frequency

to 450 MHz. The DMM will read between 0.562 V dc and

1.780 V dc.

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Page 6

Probe Disassembly

Use this procedure to access the internal components of the

Probe which includes the R2 calibration adjustment.

1. Remove the bend relief screw and move it away from the

Probe.

2. Remove the Probe cover. You will see the R2 adjustment.

3. Carefully remove the Probe tip from the front of the Probe

with pliers.

4. Remove the ground lead screw from the Probe body.

5. Lift the rear of the printed circuit board up ¼-inch and pull

it away from the Probe tip.

6. To reassemble the Probe, do the steps in this procedure

backwards (start with step five and end with step one.)

Make sure that the gold pin on the front of the printed

circuit board aligns correctly in the Probe tip and that the

ground-lead nut is aligned with the hole in the Probe body.

How to Clean the Probe

WXWarning

For safe operation and maintenance of the product,

remove the input signals before you clean the

Product.

Use a soft cloth dampened in a weak solution of detergent

and water to clean the 85RF II. Do not use solvents.

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