HP 3455A MANUAL PDF
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Jumper Removal A15 Board Set the Decade Resistor to ohms. The output of the operational jp main controller as the lOO V dc gain error constant.
3455A 5 or 6-Digit Digital Multimeter/Voltmeter
The nominal output current on the kilohm and 10, kilohm ranges is. These times are not part of the operating specifications of the instru. Instrument and Manual Identification. The squaring amplifier is a log amplifier circuit which takes the log 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.
Refer to Paragraph for a description of these offset error measurements. Remove the clip lead from across the I megohm resistor. Auto-Cal Switch Closures 8-B The output of the Converter Amplifier is applied to a rectifier circuit which produces both a positive going and a negative going half- wave rectified signal output sec Figure up Standard Abbreviations If the SA is to be tested for its hour accuracy specifications, the Transfer Standard must be adjusted for optimum 1-volt and volt output accuracy using NBS-calibrated stan- dards.
A terminal 345a5 with this symbol must be connected to ground in the manner described in the installation opierating manual, and before operating the equipment.
HP3455A teardown – part 1 – calibration module and the backside
DC Preamp gain is XI for both error measurements. A service kit is available to aid in the repair of the SA.
Learn More – opens in a new window or tab International shipping and mznual charges paid to Pitney Bowes Inc. The circuitry used in the rms converter solves for the expression which is identical to 8-SO. In order to bring the instrument out of this mode, any other function button must be pressed.
The item may have some signs of cosmetic wear, but is fully operational and functions as intended. If the DVM reading is in tolerance by a percentage that is greater than the maximum allowable error of the standard, the DVM is definitely within its specification. AC Operational Accuracy 345a5 The test limits given in the tables for the dc, ac and ohms ac- curacy tests do not include temperature coefficients. The AC Calibrator’s error measure- ment control should then be used to adjust out the kHz errors indicated on the calibration chart.
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Preamplifier and Input Alternator Circuitry 8-C Repeat steps c through f to verify the 1 V and 10 V full-scale accuracy for negative readings. 3455w time con- sists of the settling lime of the input relays, FETs, and other circuits. Derive 6-month test limits from Accuracy Specifications listed in Table The old reading is lost and there is no SRQ condition.
Use the following part numbers and descrip- tions when ordering the exchange assemblies. Disconnect the 1 kilohm Standard Resistor and msnual the K standard resistor using the same 4- wire ohm measurement configuration. Disconnect the test DVM. I V the least signifi- cant digit 10 microvolt is equal to 0. All other input switch- ing is done with FF. The A Reading should be 0.
Use a highly stable calibrated standard and add the correction factors given on the calibration chart to the 34SSA test readings. Press the Amnual button. Clear Lockout and Local Returns all devices to local front panel control and simultaneously clears the Local Lockout Message.
Device Control Messages The time period over which these parameters will not change may vary from instru- ment to instrument. Calibration module detail 1.
For example, if the calibration chart indicates that the 74SA output is 0. Learn how your comment data is processed. Offset error measurements on the 1 V dc and. The following pro- cedure should be performed in that same environment. When the Auto-Cal function is disabled to obtain faster reading rates, it is recommend- ed to periodically return the 34SSA to the Auto-Cal mode in order to update the cal constants.
The Model A measures resistance from 1 milliohm to 15 megohms in six ranges extending from. Inguard-Outguard Connections 8-B-l.