Fluke 82RF User manual

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82 RF
Figure 1. 82RF High Frequency Probe
5. Connect the probe’s ground lead to signal
common.
CAUTION
To avoid short circuit damage, never connect
the probe ground lead to apotential other than
ground unless the voltmeter is equipped with a
floating low Input (i.e., not grounded).
6. Contact the measurement point with the probe
tip and read the rms voltage level directly from the
voltmeter. Measurements above 100 MHz require
the use of the BNC adapter and aterminated
system.
CAUTION
To avoid probe damage the dc components or
the input signal must not exceed 200 volts,
including transients. 30V ac rms and 200V dc
are the maximum inputs to the probe. These
specifications allow measurements of an ac
signal riding on adc voltage of up to 200V.
When this type of measurement is being made,
the input capacitor will charge to the peak
value of ac plus dc. If the dc level is then
changed by more than 200V, the resulting
transient may damage the probe. The chance
of damage can be minimized by discharging
the input capacitor at the end of each
measurement. This is done by momentarily
touching the probe tip to the ground clip.
THEORY OF OPERATION
Circuitry within the 82RF consists of acapacitor-coupled
rectifier circuit which responds to the peak value of the
input waveform. The output is positive polarity dc
voltage which is calibrated to be equivalent to the rms
value of asine wave input. See Figure 2. Resistors, R1,R2
and R3 are selected to properly scale the dc output when
connected across adc voltmeter having a10 MH input
resistance.
Figure 2. 82RF Simplified Circuit Diagram
2

82RF
MAINTENANCE
Calibration Adjustment
The following procedure assumes the use of the
equipment (or equivalent) listed in Table 1. Make sure
that the DMM has an input impedance of 10 Mfl ±10%
shunted by less than 200 pF.
1. Complete the test set-up shown in Figure 3.
2. Set the DMM to read 2.00V dc.
NOTE
Accurate results cannot be obtained unless
the signal is terminated with 50£l near the
measurement point.
3.
Program the signal generator for an output of
10 MHz at alevel of 1.00V rms, TERM. (500
instrument).
4. Check the DMM reading, it should be between
±0.95 and 1.05V dc. If the reading is within limits,
calibration adjustment is not required. Complete
the remaining steps if adjustment is necessary.
5. The calibration adjustment is located in the
DMM connector portion of the 82RF. Refer to
Figure 4and access the adjustment using the
appropriate procedure.
6. Using aplastic adjusting tool, adjust the
calibration pot for aDMM reading of 1.00V.
7. Reassemble the probe and verify that the
DMM reading is still within limits.
Cleaning
Use asoft cloth dampened in amild solution of detergent
and water to clean the 82RF. Do not use solvents.
Table 1. List of Recommended Test Equipment
3

82RF
Figure 3. Equipment Connections for Calibration
Remove both screws
and the cover.
B
Remove screw Aand its stud. Swing
enclosure open. Do not remove screws B
Figure 4. Adjustment Access Details
4
John Fluke Mfg, Co.rlnc.#P.O. Box 43210#Mountlake Terrace, Washington 98043
Fluke (Nederland) B.V.#P.O. Box 50539Tilburg, The Netherlands