Derive 6-monih test limits from Ohms Accuracy specifications listed in Table This is accomplished by measuring the offset and gain errors and mathematically correcting for them. An integrat- ing amplifier U4 is used to maintain a dc level of 0 V dc at the output q the Converter Amplifier. Range Selection Keys — permit selection of ranges as follows: Dangerous voltages, capable of causing death, ore present in this instrument Use manuxl trome caution whoa handling, testing, end adjusting. During the warranty period, Hewlett-Packard Company will, at its option, either repair or replace products which prove to be defective. The squaring amplifier is a log amplifier circuit which takes the manul of the input voltage, or in this case since there are two transistors Q9 A and QUA in the feedback loop, takes twice the log of the input voltage. This time may also vary from instrument to instrument.
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The gallery at the bottom contains all of the images for this part. The more interesting ones are posted with extra commentary.
NOTE: No electronics were harmed during this teardown. Precautions were taken to avoid ESD and the other popular ways to kill stuff. After reassembly the meter is working just as well as it did before. I did cut my finger though. The Front Panel The front panel is well lit.
The current meter configuration is indicated by the lighting up of the button with the function as seen in the picture below. The function and setup can be changed by pressing the required button. The buttons allow you to select and set various functions — the integrated math, storage, sample rate, trigger, measurement type and similar.
All in all a very user friendly and straight forward machine. Power, fuse and fan shot The mains input, fuse and voltage selector, the fan cover and the bus setting.
And a trigger. More snaps of the backside and the cal module cage The other side of it holds the backside measurement inputs — for fixed measurements, rack systems and such, the switch that selects between the front and back inputs and the cage door for the calibrations module. It can be removed — the manual describes advises that you can interchange these modules between systems and it is practical really — you can send your calibration module to the lab and keep the device running.
Practical really. Calibration module — slightly opened The module can be adjusted slightly by these trimpots. A big red resistor? And the voltage reference: Something. Also, the board is heavily gold plated. Note the standoffs on the ASIC… Calibration module detail 1 The connoisseur will note the high impedance standoffs for the resistor reference — a special plastic stand that isolates the high impedance stuff ends of the resistors from the rest of the board.
These are then connected via flying cables with the rest of the circuit. Also note that the resistance reference was connected to the rest of the system not like the voltage — on the board — but rather through a special plastic connector so that no gunk or crap may cause leakage and measurement errors.
They were pretty serious about this stuff. Check back later for more peeks inside of this fun device!
Takazahn Set the 34S5A controls as follows: In order to get accurate ac readings especially with high voltage inputs high frequenciesthe low in- put terminal front and rear should be connected to the guard terminal front and rear. DC Zero Adjustments This is done by setting the instrument to the desired mankal and short the input leads at the measuring point. Donate By any small donation you may help me create and publish more useful stuff! Record the A reading; V. It should be free of mars and scratches and in perfect electrical order. Allow ten minutes for the Reference Divider to warm-up and stablize.
HP 3455A MANUAL PDF
The gallery at the bottom contains all of the images for this part. The more interesting ones are posted with extra commentary. NOTE: No electronics were harmed during this teardown. Precautions were taken to avoid ESD and the other popular ways to kill stuff. After reassembly the meter is working just as well as it did before. I did cut my finger though.