Fluke a AC Voltage Calibrator Teardown and Repair – Page 1. In summary, the manual puts it best: “DEATH ON CONTACT may result if. FLUKE SA. MAR 3 0 .. temperature using an rms responding meter, ( Fluke B . control is obtained via the A (Manual or Remote Mode). A AC Calibrator for a combined output ranging . The Static Sensitive (S.S.) devices are identified in the Fluke technical manual parts list with the symbol.

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The integrator output is connected to the x-input of the ana- log multiplier to control the amplitude of the oscillator accordingly. When in Remote Sense and the sense leads are accidentally disconnected, the out- put voltage will not exceed 2. One of the connectors provides interconnection to the Model A Precision Power Amplifier when usedand the other provides the selected Calibrator output except ground to any other external equipment requiring it.


Air intake through re-useable filter on rear panel. Final claim and negotiations with the carrier must be completed by the customer. Connect the A flkue the input line voltage through an autotransformer. The equipment should be connected as shown in Figure with both inner covers installed. If a quadrature level adjustment is required, adjust 1MHz A2 and 1MHz A3 equal amounts in opposite directions until the level is within tolerance.

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The output of the buffer amplifier is fed to a wideband rectifier for conversion to a proportional dc value. The counter output is the same frequency as the other outputs, but in pulse form.

Adjust kHz C42 for a frequency counter reading between Since the output of the Power Amplifier is always greater than IV rms, the Attenuator is necessary in order to obtain calibrator outputs in the range of 0.

Re-adjust the ac differential voltmeter 93 1 B and the oscilloscope differential amplifier 1 All gain for an fluuke 1 V rms null. Three ratio transformers are used to provide an output for any of the four lower ranges that is flat over flike entire frequency range of the calibrator.


The rectifier output is of the opposite polarity to the variable reference, and when the two are in the proper ratio to each other, the input to the high-gain integrator amplifier is manusl and the output is constant. The output of the buffer amplifier is a sine wave, equal in amplitude, but degrees out of phase to the in- put signal see FigureA and B.

Do not change the test equipment settings until the 10 mV readings are complete. When the nor- mal load is restored, the calibrator automatically reverts to the operate mode. This signal is the com- plement of the longest of the three negative-going pulses ap- plied to U13 from the timing one shot circuit.

Used when pcb are on the ex- tender board. As current drawn from the V regulator, through resistor R61, increases, the current through Q19 in- creases, decreasing current through Q Set the A output to 10 volts on the volt range. Connect the flke as shown in Figure flukw, insuring that both inner covers are installed and secured and the equipment set-up procedure in paragraph has been performed.

Transistors Q21 and Q22, in Darlington configurations with Q17 and Q 18, respectively, provide manuwl control for power maanual Q20 and Q23, respectively.

Table shows the relay configuration for each selected frequency. If the Volt range is selected or the logic line is low and a A is not connected, the instrument will not go into operate, but remains in Standby. This supply pro- vides the voltages for the bulk of the circuits inside the guard.

Reference 500a A1 2 Model A to Model A Connections Set the 5 A output to the voltage and frequency range desired. When the flip-flop is cleared, it changes state to open the ground connection and connect the 7-volt reference supply to the active filter.

To measure voltmeter error, pro- ceed as follows: The amplitude reference voltage is produced within the 5020a as a result of the amplitude selector switch settings. The output of the phase detector is summed with the other Oscillator inputs, and adjusts the total Oscillator feedback by an amount necessary to bring about synchron- ism with the reference phase lock input. The procedure to verify the 20 kHz to kHz area is described below. Within this band, the calibration of an rms-sensing meter is straightfor- manuaal, and the output accuracy statement may be taken at face value since it refers to the rms value.


This control loop locks the output of the Power Amplifier to a dc level of 0 volts, pre- venting drift during operation. The A amplitude accuracy statement refers in all instances to the rms value of the output which is, ideally a pure sine wave. Refer to Figure for the test point and adjustment locations on the A9 Oscillator Control pcb Assembly blue retainer pins and the A10 Oscillator pcb Assembly violet retainer pins.

If any failure occurs, the following steps should be taken: If R21 was replaced the Error Control Calibration procedure should be performed. Movement of this switch is often required to obtain null meter readings.

B Connect the HI input of the differential voltmeter to extender pin The OP line would then be high, and the expression OP operate would be true. The following paragraphs describe various condi- tions which should be considered before operating the 5 A.

IpxStall the proper fuse i. The accuracy on the 1-,and mV ranges de- pends on precision inductive dividers which are tested at the factory with special verification equipment, and do not require periodic adjustment. U8 is then reset by a pulse from U1 1. A complete check of the sensing relay is contained in Tablestep In addition to the regular Calibrator outputs, a quadrature output and a Counter output are available at BNC connectors on the rear panel.

Reconnect the coax to J5 1 and replace the inner cover.