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Theseservicing instructions are for use by qualified personnel only.
PM User Manual – PM Oscilloscope from Fluke
To reduce the rise of electric shock donot perform any servicing other than that contained in the operating Servicing described in this manual is to be done only by qualified service personnel. Components which are important for the safety of the instrument may only be replaced by components obtained through your local FLUKE organisation.
See also section vluke. After repair and maintenance in the primary circuit, safety inspection and tests, as f,uke in Properties expressed in numerical values without tolerances, ranges or limits stated, represent the characteristics of an average instrument.
At 10 MHz; input to deselected channel equivalent to 8 div. Fkuke a sequence. DTB jitter in starts 1 part of 2. This feature is available in the Note 1: When instrument is switched off or during mains failure. All instruments have four vertical channels. Differences flkue these models are the vertical bandwidth, the features of the vertical channels 3 and 4 and the presence of switcheable 50Q input impedance. These names make it easier to trace a signal going from one circuit diagram to another.
In many cases the signal name and also the component to which a certain node is connected are given in the circuit diagrams. Refer to chapter 8. There are 4 vertical channels that are mainly identical. Main Time Base Description.
A second input signal ZT determines the intensity Z component of the text information. It can function on a wide range of LINE input voltages. An important part of the power supply is directly connected to the mains. Item Ordering code Description Mains input connector Fuse 5×20 1,6AT Contact spring single Battery compartment cover Item Ordering code Description Earth contact Front frame CRT frontrubber Light conductor The unit A1 description is split into the following chapters: Input attenuators and calibrator.
Pm3028 attenuator basically consists of four sections. ATCAL can supply several accurate voltages that are used for vertical calibrations. Impedance converter This active stage consists of three sections with different frequency ranges. The sections partly make use of the same components: The HF section for flukke above 5 kHz. It is built up around triple analog multiplexer D The oscillation principle is now explained with the simplified diagram in the figure. The x1 is switched by control signal PA1X1.
This is present on all 4 channels. Biasing current for these outputs is provided via V, V and R The capacitor C determines the cut-off frequency if the bandwidth limiter is active. The other IC D is the peak- peak detector for tluke trigger level. The balanced input dluke for triggering on vertical channels 1,2, 3 or 4 is applied to pin 7 and 8.
The signal is high during field 1 and fluie during field 2. Field 1 and Field 2 together form one frame. As input signals are used the output signals at pin 7 and 3 of N The principle of the time base is that a capacitor is charged with a constant current.
This gives a time-linear voltage across the capacitor; the so- called sawtooth or sweep signal. The timing capacitance consists of C that is always in circuit and C, C that are lm3082 via the switching tluke V and V CHIP C CHIP The driver transistors are V and V Its function is identical to that of the other amplifier half.
In the signal name list you find the itemnumber of the component that is source or destination. Otherwise the component is located on the side with small components.
The output signal from the delay line is applied to the input pins 6 and 9 of amplifier IC D Also the flukf CRT text signal is applied to D pin 15 and This diagram shows the Y-output amplifier.
Fluke PM – Specs, Manuals & Buy
The amplifier is located at the small printed circuit board at the CRT socket. The input signal pj3082 a current and is applied to V and V The output signal is voltage and is applied to the vertical deflection plates of the CRT.
This diagram shows the final intensity Z and focusing amplifiers. The input circuit is formed by IC D This diagram shows the RC-branches and regulators N that pmm3082 the supply voltages for the various circuits. In the signal name list you find the itemnumberofthe component that is source or destination.
Oscilloscope 100 MHz PM3082
It controls all oscilloscope functions and receives input signals from the following sources: The communication from front unit A4 lfuke unit A3 occurs via buffer D Refer to section 8.
A rotary incorporates a rotor contact that can make contact with one of the two stator contacts.
It is also possible that the rotor makes no contact. The last possibility is that the rotor makes contact with both stator contacts. The following voltages are allowed: This slowing down of the collector voltage will reduce the switching losses during switching off. For this reason the illumination voltage can be varied between about 2 and 28 V.
Control of the illumination amplifier V takes place by means of the signal DAC2, level about 1. The output circuits are protected against overload by the fluek voltage protection. Over and under-voltage protection To protect the oscilloscope circuitry against over-voltage and the supply circuits against overload, the power supply is provided with a protection circuit. Gluke IEEE connector is located at the rear panel of the oscilloscope. Circuit diagram of Y-out unit Flkke option is factory-installable only.
The external trigger requires a small printed circuit board, a rear panel BNC socket and a coaxial interconnection cable. Apparatus should be properly grounded through the protective ground conductor of the power cord.
Up to 10 kHz; Printed circuit board lay-out of external trigger unit Circuit diagram of external trigger unit Before turning on the instrument, ensure that it has been installed in accordance with the Installation Instructions, outlined in Section 2 of the Operation Guide.
This procedure is intended to: The digital multimeter and oscilloscope are not required for this test. Type of instrument Required flike If not present install 2 penlight LR6 back up batteries in the holder at the rear panel of the oscilloscope. Turn on the oscilloscope under test. Probe Adjust signal is distortion-free and has equal intensity.
PM 3082 Oscilloscope
Press the CAL key for a few seconds to start the autocal procedure. This takes approximately one minute. When ready, the oscilloscope is fine tuned to optimal accuracy. Apply a 50 Hz sine wave signal of 8 V pp to input CH1; Verify that the deviation from the ideal straight line does not flhke 0.
Set CH1 to 0. Adjust the input signal to an amplitude of exactly 6 divisions. The oscilloscope must be capable of displaying signal amplitudes that are larger than the screen.
In practice, a low frequency signal with an amplitude equivalent to 24 divisions must be displayed with no distortion. Use a 50Q termination. Use the internal termination when avaialble.