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LE ADERITESTIINSTRUMENTS DE. MODEL LDM DISTORTION METER. OPERATING INSTRUCTIONS. PITON. TEISIN DS3rtso. LEADER ELECTRONICS . I’m looking for a LEADER LDM distortion meter service manual. to you, if you need this, is a service manual of LDM distortion meter. Path: /leader/ldm/. This is the These manuals are available for download and free of charge. Manual for the Leader Model LDM Distortion Meter.

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Search the history of over billion web pages on the Internet. Full text of ” Leader: To avoid peader shock, do not perform any service in this manual unless qualified to do so. Triangle Wave Output voltage Symmetry 20Vp. Sawtooth Wave i Output voltage Symmetry i 20Vp. Continuously variable, 20ms 50Hz to 5s 0. This is connected to X-axis of an oscilloscope.

Leader Audio Equipment

Carrier suppress function is available. BkO of output impedance. Ikil of output impedance. TTL level output Fan out: It should also be confirmed that the unit connected to the rated power line voltage. All adjustments should be completed in the given order, because some adjustments interact with others.

Thil will maintain all circuits at constant operating temperature. When connecting the oscilloscope to the test point, use a low capacitance probe.

The initial control settings to be used for each check and adjustment are listed below. Any variations from these settings are stated in the applicable procedure.

Refer to Figure Figure XS 2 Amplifier – Set: Use DC input mode. DC Output – Set: Sawtooth Output – Set: Check all control settings, an incorrect setting can make a good unit appear defective. If there is any question about mznual function, refer to the Instruction Manual for correct operation. Check all circuit for visual defects such as broken component, loose connection, open wire, poor soldering etc.


Some troubles can be solved with proper adjustment. Check the voltage and waveform as shown in the Schematic Diagram to locate the defective circuit. Frequency can also be controlled by an externa? VCG input J2 on the rear panel. The sine shaper receives the triangular wave from the basic generator and converts it through a diode-resistance network to a sine wave.

Leader Audio Equipment | Test Equipment Expo

The sine, square and triangular wave are routed through a function switch S to the AM modulator. Sweep Generator Sweep generator is two generators. The master generator is a VCG and the secondary generator produces a sawtooth waveform that sweeps the frequency of the master generator.

All outputs; sine, triangular or square can be swept linear or logarithmic on each range. The sawtooth is applied to the H OUT connector on the rear panel. Output Amplifier and Attenuator The output amplifier produces a high amplitude output directly coupled through the 50 ohm attenuator.

Signal offset is controlled at this point. A mA fuse is installed on the attenuator pc board T to protect the output from any externally applied voltage.

The attenuator is a passive 10, 20, 40dB resistor network. Attenuation is OdB with buttons out and 70dB with all buttons depressed. Symmetry Symmetry of the square wave is controlled by comparator Q, Q and IC, Adjusting VR, symmetry control, changes the voltage applied to IC changing the symmetry of the applied square wave.


Check the following points.

Refer to section ” Refer to Table Proceed to step ” 2 “. No; Troubleshoot regulated power supplies. D, IC T-2main board and associated circuit. D, IC Tmain board and associated circuit. Refer to page for replacement. No triangular wave comes out.

Distortion Meter LDM-171

Check waveform at TP2 T, main board for triangular wave. Troubleshoot output amplifier, attenuator. Function switch and associated circuit. Troubleshoot voltage to current converter, Frequency switch and associated circuit. No sine wave comes out Confirm ledaer the triangle function works correctly. Troubleshoot Function switch and associated circuit. Troubleshoot sine converter and associated circuit. No square wave comes out Confirm that the triangle function works correctly.

Check waveform at junction of VR T—main board and Function switch for triangular wave. Leafer square wave shaper and associated circuit. No frequency change or intermltttent by rotating Frequency dial. Troubleshoot VR, Frequency switch and associated circuit. Troubleshoot low frequency feedback amplifier and associated circuit for xl and lower ranges.

Troubleshoot modulator and associated circuit. Troubleshoot output stage and associated circuit. Troubleshoot Sweep switch and associated circuit. Troubleshoot sawtooth generator, ldm1-71 sweep shaper and associated circuit.