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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Perform differential time accuracy test as follows: The CRT cathode and grid voltages are devel- oped in the secondary of high-voltage transformer A15T1. Perform deflection factor test as follows: Remove plug-in assembly A8 or A9 from assembly A7. Check for less than 1 division of baseline 1740w at fastest sweep speed. When the Z-axis input goes positive, the cathode of A14CR4, which drives the chop blanking line, goes positive and blanks the gate.
Barry Fox New Member Jul 9, Selects the vertical deflection factor in a 1. Disconnect plug to A5.
Only contact strips and their actuating cams are contained in the attenuator assemblies. FigureReplace figure with figure With internal trigger signals, the trigger level selects any point on the vertical waveform displayed. The outer rotating section selects the delayed -sweep 1740z, which is indicated by 1740x marker on the outer knob. A8C13 to PF. Hollow cathodes can be detected by in- creasing intensity. Instructions for removing major assemblies are contained in the following paragraphs.
Adjustments Model A c. The trigger generator is armed at the end of hoidoff and is ready for the next trigger signal. To re move and replace the CRT, see figures andand proceed as follows: I have had a HP A Dual trace oscilloscope for over 20 years, with a full set of instructions and circuit drawings, and 1740aa has a common vertical deflection problem on A, B or chop.
Identical signals are applied to both channels with channel B operated in the inverted mode. In Chop mode, trigger signal is derived from channel A.
Loosen clamp screw at rear of shield and remove CRT from shield. Adjust either channel vernier whichever is 1740x effective to achieve minimum deflection.
HP 1740A Oscilloscope – Repair HELP!!!
Vertical Control Switch- ing Assembly A 13 contains the sync control switches necessary for selective internal triggering. A old thread by Jim Yanik recommended shorting the vertical deflection plates to each other, which did result in a correct centered trace. Test equipment required for the performance tests and adjustment procedures is listed in table Vertical Control Switching Assembly A13 controls operation of substrate A3A1 on the vertical preampli- fier as described in the following paragraphs.
Option incorporates the following changes to the standard Model A: Disconnect the post-accelerator lead and immediately discharge lead to ground.
Full text of “HP: A”
Painted surfaces can be cleaned with a commercial, spray-type window cleaner or with a mild soap and water solution. Attenuator Stages Be sure to record these changes in your manual. Preliminary Main Sweep This option omits the two Model D divider probes normally supplied as accessories.
Triggering is same as Normal above 40 Hz. The preamplifier substrate A3A1 performs the necessary control func- tions for both channels A and B, including six dc- actuated ranges of attenuation per channel.