HP 1740A PDF

A Oscilloscope Operating and Service Manual. Part Number: ( Aug 76). The A is no longer sold by Keysight; this manual is provided for. To buy, sell, rent or trade-in this product please click on the link below: http://www · MODEL A. OSCILLOSCOPE. HEWLETT-PACKARD COMPANY/ COLORADO SPRINGS DIVISION. GARDEN OF THE GODS ROAD, COLORADO.

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Disconnect equipment and return Model A controls to initial settings.

This limits the output current. To 11740a you need to register. Peripheral circuitry includes control logic for the preamplifier substrate and a trigger-view amplifier, which routes signals from the external trigger input through the delay line and out- put amplifier.

HP A Hewlett Packard MHz 2 Channel Oscilloscope | eBay

To reinstall A5A1, reverse the removal pro- cedure, being certain to note orientation of parts 1740 shown in figure Vertical Control Switching Assembly A13 controls operation of substrate A3A1 on the vertical preampli- fier as described in the following paragraphs.

Verify that Model A power cable is not connected to any input power source.

Potentiometer A16R20 adjusts the floodgun pattern. Low-voltage Power Supply Assembly A Vertical Section At high intensity levels these transistors are sometimes operating at fairly high voltages and are therefore subject to failure. Location of A7 Attaching Screws To compensate for pulse generator rise time, use the following formula: Decrease oscillator amplitude to lowest amplitude where stable triggering can be maintained. When input coupling is in the position AlSlA-C closedthe input signal is terminated in 50 ohms.

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Most of those probes cover the 20 pF input capacitance of the A and should work fine. The gate Schmitt, on assembly A7 is forced on, and control of the gate is from the rear panel Z-axis input J8.

HP 1740A Oscilloscope – Repair HELP!!!

The horizontal output stage provides drive to the CRT horizontal deflection plates. In the AUTO position, a bias is applied to these transistors and the bright- line auto circuit is activated. This instrument was carefully inspected both mechanically and electrically before shipment. BNC connector for external trigger input. The IC regulation includes an output current limiting circuit consisting of an NPN transistor whose collector is connected to the differential amplifier and first base of the Darlington pair within the ICThe emitter and base connections for the NPN transis- tor are pins 10 and 6 on A16U1.

Not much luck in my search for the spares. If no horizontal deflection occurs, then assembly All is probably defective, If A3R79 is changed, recheek steps j and k in paragraph for correct balance.

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Antique Radio Forums • View topic – Just got an HP A

A5A1 Removal In main sweep operation, the gate follows up main sweep. Return controls to initial settings, Dec Thu 12, Dec Thu 12, 2: This section contains performance tests and adjustment procedures for the Model A Oscillo- scope. Gate Control Simplified Block Diagram Connect Model A input power cable to input power source. Attenuator Assemblies Not required on Option instruments.

It should be free of mars or scratches and in perfect 17400a trical order upon receipt. Disconnect 9 Z-axis wire on rear of A The block diagrams are drawn for function and do not show circuit details.

Displays the channel B input signal. Note that one sweep occurs for each direction of rotation.

This arms the second Schmitt trigger. Do not apply 1704a than 5 V rms to the input connector. Disconnect, CRT leads 3 and 9. The A is an excellent scope, I have it’s storage counterpart the A.

Delayed sweep is started by a negative-going pulse at the collector of A10Q Knr additional important information about serial mini hers, see f N STKl: Barry Fox New Member Jul 8,