Fluke 85RF II Instruction Sheet Download Page 3

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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. 

WX

Warning 

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.

 

 

Summary of Contents for 85RF II

Page 1: ... 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 speci...

Page 2: ...ue 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...

Page 3: ...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...

Page 4: ...bration 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 damage...

Page 5: ...e 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 t...

Page 6: ...of the printed circuit board up 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...

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