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 Oscillator comprises a summing amplifier, a quadrature amp- lifier, an oscillator amplifier and their associated resistors and capacitors. The signal on pin 53 of P90 determines which set of amplitude information is gated to the com- parator. The main function of the Model A is to gen- erate an ac 5200q which can be precisely selected over wide ranges of frequency and amplitude.
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Clean the filter using either low pressure clean dry air or a water and mild detergent solution. Connect the equipment as shown manal Figure for the remainder of the test. The Motherboard Assembly has no active compo- nents. Note that the Mode flip-flop would be un- affected, remaining locked in the Standby state by the low state of pin U At 1 MHz, the distributed capacity along a coaxial lead greater than 1 food in length, could overload the quadrature output.
Reapply line voltage to the instrument. Connect the shields of the jack and plug together with a short alligator clip lead. The rear panel connectors are a pair of pcb card-edge connectors accessed 5200s openings in the panel.
If a 2 Watt carbon resistor is used for the load, leave connected only long enough to measure the regulation.
Full text of “FLUKE A Instruction”
Used for proper grounding during accuracy measurements. The compare output pulse sets a flip-flop which by means of FET switches, removes the out- put of a 7-volt reference supply from the input of a five- pole, active filter, and replaces it with a ground.
As shown in Figurethe quadrature amplifier output is fed from the Oscillator assembly to the y-input of an analog multiplier U3 contained in the Oscillator Control assembly. Five frequency ranges provide outputs of 10 Hz to 1.
Connect the equipment as shown in Figure Front Panel Controls, Indicators and Terminals The low voltages produced by zener diodes CR8 and CR9 provide the necessary collector vol- tages for the mnaual transistors, in place of the volt supplies.
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 flhke zero and the output is constant. Secure the cover over the power supply compartment only. Remove the two inner covers to expose the pcbs.
Table contains a list of representative frequenciesvoltagesloads and tolerances for the Harmonic Distortion test. If the guard feature is to be used, the interconnecting cable must be shielded. Oscillator Control Assembly, A The two main functions of the Oscillator Control assembly are to adjust the amplitude of the Oscillator out- put in accordance with a negative amplitude control voltage from the AC-DC Converter, and to keep the Oscillator out- put in phase with some external reference frequency when that feature is used.
With the exception of the extender board, these are common items which may be easily ob- tained or fabricated locally.
Sense connections are described in paragraph and guard connections are described in paragraph Do not change the test equipment settings until the 10 mV readings are complete. On the truth table 0 is the equivalent of a logic high and C of a logic low. The Oscillator Control Assembly uses the amplitude control voltage to adjust the oscillator amplitude in the proper direc- tion.
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Do not change the settings on the ac differential voltmeter until the mV calibra- tion is complete. To use either of the other methods refer to the instruction manual for the test instrument selected. All material in the container should be checked against the enclosed packing list. Check the Standby logic lines from the Attenuator assembly and back to the switchboard Mode Latch and Remote Circuitry.
Refer to Section 6 of this manual nanual remote programming information used with this option. When the tests are complete and any fault located repaired, return to step 6 or step 8 as applicable. Overload Test