View and Download Fluke A instruction manual online. Voltmeter. A Measuring Instruments pdf manual download. Also for: ac. Fluke A Pdf User Manuals. View online or download Fluke A Instruction Manual. Make: Fluke. Model: A, AC. Dealer: User Equip. File, FLUKE A, AC Share technical documentation including product manuals, getting.
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Fluke A AC-DC Differential Voltmeter | eBay
When the results of these checks agree with the information given, the AC Converter is functioning prop- erly and the test equipment can be disconnected 893x the instrument. The functional block diagram is illustrated in Figure and the schematic diagram is contained at the rear of the manual.
I was told that the two series capacitor voltages had been checked with a voltmeter. Reference voltages of 1. The meter pointer should deflect above and below the minus 1 indication. Remove the lower front and rear trim strip attacliing screws and remove the trim strips from the instru- ment. Box Mountiake Terrace, Washington T. Refer to Section IV, paragraph and for battery re- placement instructions. Wlien performing these checks it may become necessary to replace component parts in order to ob- tain the desired results.
Personally, I found this argument questionable. Model A can be used to obtain the accurate ac voltages, and a John Fluke Model B can be used to obtain the required dc voltages.
There are a lot of possible explanations for this. We flukke that you thoroughly read and understand this section of the manual before attempting any maintenance on your instrument.
Full text of “FLUKE A, AC Instruction”
This signal is proportional to the difference between any feedback voltage from the meter circxiit and the input voltage at terminal 2. Our items are described as accurately as possible, however, should an item arrive damaged or incorrectly described, we will do our 8893a to work with you to resolve the situation.
Loosen the front panel control knob set screws and remove all of the knots from the front panel. Accurate dc measurements can be made in the presence of com- mon mode voltages up to volts dc or ac voltages up to volts peak-to-peak at 50 to Hz. So our company used two lower voltage electrolytic capacitors in series to withstand the high v DC voltage. An item that has been used previously.
A Model A serial number thru The remaining circuitry operates similar to the dc differential mode with the only dif- ference being the absence of the polarity reversal switching. Connect the Model power cord to available line power.
Tran- sistor Q3 compares the sample of the Reference In- verter Assembly output voltage to the zener reference voltage and amplifies any resulting difference. Adjust the meter mechanical zero screw, acces- sible from the front panel, until the meter pointer indicates zero-center. Should any difficulties be encountered during the operation of your instrument, please feel free to contact your nearest John Flulce Sales Representative or write directly to the John Fluke Mfg.
In the last few years I worked for a company that designed and built fluorescent ballasts. Lexington, MA Tel. Reapply ac power to the instrument and, using the information provided in Figureclip the cor- responding jumper or jumpers.
Fluke 893A Instruction Manual
L Tel – TWX: I actually made a crude one in the lab myself and measured the capacitors’ voltage accurately. In this case, the reference designations for the components of the subassembly may appear out of order. This answer pretty much drove me crazy. Download an averaged model demo. The voltmeter’s own impedance typically 10 Megohms may be much lower than the capacitor’s resistance.
Somewhat to my surprise, the voltage actually did divide down flkue extremely close to half the total applied voltage within a few volts! Adjustment and Test Point Locations Sheet 4 of 4. This allows access to the Reference Inverter and AC Con- verter printed circuit board mounting screws, all of the switches used in the instrument, and potentio- meter R Operation as a Null Detector fulke It can also measure AC voltages, but I haven’t looked into how it does this I suspect it uses an “ideal” rectifier circuit and then compares the rectified AC to its DC zener standard voltage See the picture below.
As each malfunction is corrected, a complete recheck of the particular circuitry involved is also necessary. This instrument is entirely solid state transistors but it’s still pretty old. Box Beaman Place Tel. Indonesia Iran Barkeh Company Ltd. Disconnect the oscilloscope from the Model