Fluke 82RF Manual de usuario

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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

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.

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

82RF

Figure 3. Equipment Connections for Calibration

Remove both screws

and the cover.

Remove screw Aand its stud. Swing

enclosure open. Do not remove screws B

Figure 4. Adjustment Access Details

John Fluke Mfg, Co.rlnc.#P.O. Box 43210#Mountlake Terrace, Washington 98043

Fluke (Nederland) B.V.#P.O. Box 50539Tilburg, The Netherlands

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