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 equipment should be connected as shown in Figure flukee both inner covers installed. The Oscillator Control Assembly uses the amplitude control voltage to adjust the oscillator amplitude in the proper direc- tion. Repair as required and repeat the step causing the transfer to this step. Note and record the 93 1 B null meter reading in percent.
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During that period of time the outputs of all the comparator gates will be high, and normally high pin 8 of U1 8 will go low. This Variable Refer- ence voltage is the positive dc output of a five-pole active filter. BoxMountlake Terrace, WA ; telephone Perform the following procedure prior to beginning any operation.
The two wave forms should be displayed, out of phase with each other. When either the V or the 10V range is selected, the output signal is applied directly to the front and the rear attenuator output connectors by relay K1 no attenuation takes place.
Voltage accuracy is then the algebraic sum of all errors noted up to that measure- ment level. If the instrument still does not pass those tests, perform the Signal Path Test Subroutine beginning at Step In all cases the output of an individual MSD switch as monitored at the Reference Assembly should be the complemented BCD equivalent of the switch setting.
Power Amplifier Assembly A7 Monitor the frequency counter for the selected fre- quency within the tolerances listed in the specifica- tions in Section 1. This passes through the motherboard.
Fluke A Calibrator Service and User Manual
An inspection of the sche- matic will show that this is the case. Knowing that there is a problem. The front panel may be removed entirely if desired by removing the wires from the pcb that bring the line voltage to the power switch. The voltage level obtained for the 10V range is also obtained on the four lowest ranges, but at- tenuated to the desired range by assembly A6. 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.
This alters the over- all and the input-stage feedback resistances, respectively, and fixes the gain of the Power Amplifier at In the volt range, the sense signal is inductively divided by a factor of 10; and in the volt range, the sense signal is resistively divided by a factor of Reapply line voltage to the instrument.
NOTE Prior to beginning the periodic calibration pro- cedure it is recommended that the Cleaning Instructions contained in paragraph be per- formed. Relay A10K1 is held closed on all ranges except 1 MHz.
The frequency of the Oscillator, within the selected range, is determined by the net value of resistance between amplifier stages.
This section contains information on General Main- tenance, a Performance Verification test, a Calibration pro- cedure and Troubleshooting information.
At this same time, the output of U2 is low. Air exit along both sides. The equipment should have a warm-up period of at least one hour prior to performing any test. Accessory chassis slides part number M can also be installed to better facilitate access to the rack- installed equipment. The output at 1 MHz is purposely adjusted 0.
Obtain an output from the test oscillator of 10 volts a. The first and preferred method uses the thermal transfer method Fluke Model B. The quadrature output leads the regular output in phase by 90 degrees.
The quadrature and oscillator amplifiers, in conjunction with their frequency, select resistors and fre- quency range select capacitors, form a pair of integrators, each providing a phase shift of 90 degrees; or a total phase shift of flule. High and low sense terminals and connectors are provided for this purpose, on the front panel output and on both of mznual rear panel outputs, and may be used when operating mamual the IV, 10V and V ranges only.
Special Calibrations Line Voltage Selection If the reading is not within tolerance turn R26 Bias Control fully counter-clockwise for an approximate voltage of 0. The phase detector provides a slight ad- justment of oscillator loop gain, and thus provides a small amount of frequency control.
The quadrature output leads the regular output in phase by 90 degrees. Generally speaking, the optimum flluke for low-level calibrations when using the mV ranges of the A are as shown in Figure On the 1- and millivolt ranges, sensing is always internal and is derived from the ratio transformers used in these ranges to step down the power amplifier out- put to a level suitable for application to the AC-DC Conver- ter.
The test equipment required for the performance test is ,anual in Table Refer also to paragraph Extreme caution should be exercised when working with these assemblies.
The control loop linearity is calibrated at full scale and one-tenth of full scale in the 10V mode of operation. Connect two cables of the manuual length approximately 2 feet between the A output and the El and E2 inputs of the phase meter as shown in Figure