If you find any mistakes or if you know of a way to improve the procedure, please let us know. Page 2: Paragraph Page Final procedure Test Instrument Identification. Page 3 Test instrument parameters Harmonic distortion relative to fundamental at full output Amplitude modulation Square wave Ramp retrace Frequency Sine wave Square wave Triangle Positive slope ramp Negative slope ramp Phase offset Amplitude Amplitude accuracy with no attenuation attenuator range 1 into 50 load no dc offset Flatness with no attenuation Page 4: Equipment Requirements TB Test instrument parameters Amplitude accuracy with offset attenuation range 1 into 50 load Attenuator accuracy these errors are additive with the amplitude accuracy errors Amplitude output Amplitude option high voltage output Dc offset Dc offset option Dc plus ac Not verified below 50 Hz. Page 5: Accessories Required 5.
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The frequency can be specified with up to eleven digits of precision! This is one of the first instruments to use a "fractional—N" PLL synthesizer. The output frequency is derived from a reference frequency which can also be supplied externally.
Internal construction is simple and clear. A central chassis carries circuit boards above and below, and there are no voluminous or heavy parts other than the mains transformer. HP offered two major options on this unit: Opt. The mains transformer is permanently connected to the line so that the OCXO can be kept powered on at all times, and the nominal output frequency is available without waiting for warm-up. As a consequence, even the pictured unit without Opt. Instead, HP used a proprietary microcontroller only known as "", designed and produced by HP itself.
This chip can also be found in a number of HP computer peripherals of the 98x5 desktop computer era, such as diskette drives or printers.
The required bias voltage was apparently somewhat variable between production runs, so the correct value was stamped or even hand-written onto every chip. In case the processor needs to be replaced, the technician may have to modify a voltage divider on the main board! Until recently, little information on the processor was available online. In the , the Nanoprocessor was combined with two "huge" RAMs x4 bit! ROMs holding the firmware. Apparently, the developers then still had sufficient time for debugging Repairs The unit pictured here, manufactured in early judging by the date codes on the various chips, worked almost out of the box.
The usual problems with sticky keys were easily solved no pun intended using alcoholic cleaner and a little exercise. Initially, the unit tended to lock up soon after power on if more CPU intensive tasks were executed e.
This problem disappeared after warm-up. There is a relatively high drop across a choke on the CPU board that I will likely replace in the long run. A tiny increase of the supply voltage fixed the issue. Resuscitation 1 After several hours of patient operation, the died unexpectedly, with a faint odour of hot plastic. Disconnecting the internal boards one by one quickly identified the output board as the location. Maybe the output stage?
Oh well, get the magnifier in. Cross-reference parts lists identify it as an LM x1 buffer. No need to despair: The pinout is the same as a , which specification-wise will do fine here. Another thing that irks me about the is that the poor little reference crystal is located right in the main airflow path from the rear fan. A small styrofoam baffle should at least improve short term stability a little.
It did make frequency trimming a bit easier, although putting the bottom cover back on still offsets the frequency quite a bit. Styrofoam baffle for the reference crystal Resuscitation 2 Especially since that choke was installed, my has had cold start problems literally related to temperature.
This one has "5. Well then, how does this thing reset in the first place? According to the schematic from the manual and the pinout diagram , there is no reset pin?! Apparently, replacing that choke upset the power supply sequencing.
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Kajikinos The preceding range of instruments contain the VCO circuitry shown in Figurebut a not have R Change the power supply output to the following voltages and repeat Steps j through m for each. Output amplitude is 1 mV to 10 V peak-to- peak. Press the key in the lower right corner of the A front panel to select the High Voltage output. TB Test instrument parameters Amplitude accuracy with offset attenuation range 1 into 50 load Attenuator accuracy these errors are additive with the amplitude accuracy servife Amplitude output Amplitude option high voltage output Dc offset Dc offset option Dc plus ac Not verified below 50 Hz. Repeat mankal d and g.
HP 3325A SERVICE MANUAL PDF
Synthesizer The HP A is first with microhertz resolution below kHz along with frequency coverage from. Signal purity, accuracy and stability are as good or better than earlier stand-alone HP synthesizers. Function Generator The HP A is also a high performance function generator providing precision waveforms with synthesizer accuracy and resolution. Squarewaves to
HP 3325A Manuals & User Guides
Above pictures can be different from actually sold item as well as the installed options. Synthesizer The HP A is first with microhertz resolution below kHz along with frequency coverage from. Signal purity, accuracy and stability are as good or better than earlier stand-alone HP synthesizers. Function Generator The HP A is also a high performance function generator providing precision waveforms with synthesizer accuracy and resolution. Squarewaves to Triangles and ramps with. All waveforms can be dc and phase offset.
HP 3325B Operating Manual