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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When lit, indicates the trigger circuit is armed.
Apply kHz sine wave to both channels. Adjust A12R16, Y-align, so that vertical trace is parallel with the vertical graticule line.
This completes the cycle and sweep continues in this mode until a trigger signal is present, No time relation displayed. This voltage does not change when disconnecting the 2 wires mentioned above. To participate you need to register. Remove two screws holding A5 to bracket and heat sink, and remove board.
Option circuits on assembly A14 operate as follows. Channel A and B signals are dis- played simultaneously by switching bet- ween channels at a kHz rate. A3R79 until both channels trigger stably and are in phase.
Hi Eric Have done the modification with the results attached. Disconnect post-accelerator lead from CRT and immediately discharge lead to ground. The multiplier output is connected to the CRT post- accelerator.
The integrated circuits IC’s in this in- strument are plug-in types. Theory Model A Use the original shipping carton and packing material.
HPA Oscilloscope | QRZ Forums
This 174a the voltage driving one horizontal plate through A11R7. The preamplifier substrate provides two pairs of differential outputs: The purpose of this assembly is to delay the vertical! The second five contacts AlSlF-J switch dc control voltages to the preamplifier substrate A3A1 that switch attenuation on the substrate. The reset and hoidoff circuits control the timing sequence of the sweep ramp.
Disconnect delay line wires 46and 0 from back of A5. Volt on 1st deflection plate Rotary switches can easily be serviced after re- moval from the instrument.
If grid and cathode voltages are present on A15, verify that voltages are present at the CRT socket; a faulty socket or wire can cause an open circuit.
Connect digital voltmeter to A3TP9. It also connects the sync amplifier output to the horizontal preamplifier. This protects the CRT from high-intensity burns. Triggering point is approx center screen.
I had to cut the tracks, as the chip is a flat ceramic type, with 1740x clips on th PCB. The cathode voltage will vary between — V to — V, depending on component tolerances of A15R13 and A15R22 and is not adjust- able. Adding the two R has shown that the two left side transistors are correctly biassed. Sweep time shaft can now be removed.
Introduction R ecommended Test Equipment. Problems in the vertical amplifier may show up as a variety of symptoms. Disconnect Interface Assembly A Any distortion in presentation is caused by incorrect probe compensation. Just got an HP A Posted: The set and trigger 1740s drive a current switch that starts the sweep.
Pulse Response A5R24 1. Its output arms the delayed-trigger circuit.