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calibrator signal generator for 1V rms at 25 MHz and the
DMM to measure 1V dc.
C1
C1
220 pf
R1
220 k
R2
500 k
AC INPUT
DC OUTPUT
CR1
CR1
CR2
CR2
R1
R3
R3
1.3 M
R2
Figure 1. Schematic Diagram
1
2
5
4
3
Fluke 85RF Probe under test
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Required Equipment List
The following equipment (or equivalent) is required for
testing the performance of the 85RF:
EQUIPMENT TYPE
RECOMMENDED MODEL
A
AC Calibrator
Fluke 5520A-SC600
B
50-Ohm Feed Thru
Termination
Fluke Y9103
C
BNC Jack to Banana
Plug Adapter
Fluke Y9108
D
BNC to Probe Adapter
Fluke P/N 574756
E
Digital Multimeter, 3-
1/2 Digit (DMM)
Fluke 87-III
F
BNC Jack to Jack
Adapter
Pomona 3283
Figure 2.
Equipment Configuration for Performance Testing
2.
The DMM should read between 0.950 and 1.050V dc. If
the probe is functioning but is not within these limits, access
and adjust R2 for a DMM reading between 0.990 and 1.010V
dc. Reassemble the probe.
3.
Transfer the unit under test to the Normal output of the
calibrator and reduce the output level to 0.250V rms 1 MHz.
The DMM should read between 0.223 and 0.280V dc.
4.
Set the AC Calibrator to STDBY, decrease the
frequency to 100 kHz, and increase the voltage to 30V ac
rms. (Do not exceed this value.)
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