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DATRON 1061A Digital Mulitmeter

M30 is fed from A The value of R5 is factory- selected to equalize readings of the same input, taken at differing read-rates including ‘one-shot’ measurements.

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R90 is the zero adjustment for the half wave rectifier M8 and R35 is the high crest factor gain adjustment. The output is potentially divided by R7 and R8 so that 1 volt full range is presented to Ml, another unity gain amplifier. This signal is fed to M via inverter M39 and after a further – 2is compared with the actual line frequency see Fig 3. Add to Watch list.

MC BCP 7!!! Appendix 1 lists the ‘F. Potentiometer R5 is adjusted to remove any offset caused by Ml and M2. Remove variable supply and reconnect items discon- nected in steps 5 and 6.

The DC Isolator includes the preamplifier, range scaling circuits and bootstrapped supplies. This manual contains super illustrations and diagrams as well as having in-depth operating, maintenance, and calibration information for these Datron multimeters. Input protection is provided as follows: The circuitry is placed into the.


DATRON 1061 Digital Multimeter

Ml 6 is the active element of a switched 3-pole Bessel filter. Earth screening of the covers and guarding is provided by aluminium plates, heat-staked to the inside of the covers with electrical connections made by spring contacts. M22 output Test link TLK is fed directly to the unity gain frequency compensation stage. Thus the processor under remote control is able to ‘simultaneously’ set up the requirements for the next reading, convert the current reading and process the last one.

Up to volts is present inside the instrument.


Place instrument into HOLD. If the drift was positive turn R clockwise, if negative turn R anti- clockwise.

The varicap is thus adjusted to give the amplifier chain a flat frequency response. Under these circum- stances, the calibration memory is not updated and the instrument goes into ‘Hold’ with the calibration button calibration key LED remains on. The selection of a lower range energizes relay RL1 via Q33causing resistor chain R1 R to be in series with the Hi input. An input greater than 2 amps causes the current datdon, located on the rear panel, to blow.

The capacitance of varicap diode D14 is deter- mined by the bias voltage at J Select V range and apply -M9mV.

Priority of activation is ensured by making each job exit on completion, to the top of the schedule. Once this transfer of data is complete the RAM be- comes deselected, the buffers return to their third state inhibiting the data bus to the RAM and connects the ‘A’ inputs of M9 to the address lines of the RAM.


Full text of “Datron: Datron a Service Manual complete with schematics and partlist”

Since the current in R is controlled to be constant by Q30, referenced to D50, the current flowing through R is reduced. T1 has a split primary comprising two V windings, intended for either series or parallel connection depending on the line voltage.

Data datorn by the system consists of a stream of measurement information dstron which a number of operations are carried out. This signal also resets M2 ready for the next key selection.

This means for example that calibration directly to a standard cell is possible. Q9 causes the amplifier output to be directly connected to its inverting input, giving a gain of unity. The ULA determines whether the master clock is running too slow or too fast, producing a signal on pin 20 whose pulse-width is proportional to the difference. The Digital assembly contains the circuitry providing the vatron management of the instrument and the digital section of the A-D converter.