85RF Fluke Electronics, 85RF Datasheet - Page 4
85RF
Manufacturer Part Number
85RF
Description
PROBE HIGH FREQ 500MHZ
Manufacturer
Fluke Electronics
Type
High Frequencyr
Specifications of 85RF
Impedance
10M Ohm
Voltage - Max
30VRMS, 200VDC
Lead Free Status / RoHS Status
Lead free by exemption / RoHS compliant by exemption
Ratings
-
Current Rating
-
Color
-
Termination
-
Wire Insulation Material
-
Cable Length
-
Other names
532457
5.
read between 27 and 34V dc
6.
sine to 1V rms 160 MHz. The DMM should read between 0.9
and 1.12V dc. Increase the frequency to 450 MHZ. The
DMM should read between 0.71 and 1.141V dc.
Troubleshooting
Isolate a problem to the probe by verifying the operation of
the probe’s input source and output DMM. Most probe
malfunctions are caused by the failure of diodes CR1 or
CR2. Suspect CR1 if there is no output when an input is
applied to the probe. Excessive linearity error may be due to
the failure of CR2. Use a continuity test for in-circuit diode
testing. If the diodes are good, check the input and output
connections to the printed circuit board and the continuity of
the output cable.
The diodes have glass bodies; care should be taken to avoid
stressing them, particularly when preparing the leads. The
diodes are also subject to failure from overheating. When
soldering, hold the lead near the diode body with a pair of needle
nose pliers. Avoid excessive heat.
Probe Disassembly
Use the following procedure to access the probe’s internal
components, including the calibration adjustment R2:
1.
probe.
2.
3.
a pair of pliers and drawing it out of the front of the probe.
4.
5.
it firmly away from the probe tip.
6.
procedure. Make sure that the gold pin on the front of the
printed circuit board centers properly in the tip and that the
ground-lead nut is aligned with the hole in the probe body.
Cleaning
Use a soft cloth dampened in a mild solution of detergent
and water to clean the 85RF. Do not use solvents.
85RF PARTS LIST
C1
CR1
CR2
R1
R2
R3
Return the AC Calibrator to OPER. The DMM should
Return the UUT to the scope output and set the level
Unscrew the bend relief and slide it away from the
Lift off the probe cover. R2 is exposed.
Remove the probe tip by carefully grasping the tip with
Unscrew the ground lead from the probe body.
Lift the rear of the printed circuit board slightly and pull
To reassemble the probe, logically reverse this
DESCRIPTION
Cap, Ceramic Chip, 220 pF
Diode, Germanium
Diode, Silicon
Resistor, cf, 220k
Resistor, Var, 500k
Resistor, cf, 1.3M
Body, Probe
Cover, Probe
Tip, Probe
Wire, Ground Assy
Decal, Probe
Contact, Ground
Contact, Twist Pin
Tip, Insulated
Tip, IC
CAUTION
PART NO.
758078
629261
639922
348953
442558
607267
607291
585842
586560
294991
583682
583674
574624
606988
581751