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Thus M becomes a logic ‘O’, enabling the sequencer M47 an octal counter to proceed on to the next step via M Apply IV 50kHz and adjust C63 for a display of 1. VAL to be set high.

This signal can then be used, for example, to drive X-Y plotters or strip chart recorders. This amount is subject to change until you make payment. Wait for reading to stabilize before operating ‘Zero’ Select ‘Input filter’ for remaining steps Lethal voltage present.

Datron Autocal AC Standard with option The two side and centre pcb’s are used for interconnections between the main circuit boards. The signals are fed to Q36, M34 which comprise a high speed buffer with high common mode rejection ratio See Fig.

The unity gain frequency compensation amplifier consists of a stable DC path, provide by Mil, and a fast AC path provided by Q25 to Q The item may have some signs of cosmetic wear, but is fully operational and functions as intended.

To retain the calibration memory, the instrument must be powered-up during replacement. The combined effect of this and the kHz output from M is to ‘stretch’ the waveforms of the Phase 1 and 2 clock outputs illustrated in Fig.


It should only be used when a full calibration i.

DATRON Digital Multimeter | eBay

This signal also resets M2 ready for the next key selection. Digital and analog assemblies. The output of the amplifier is attenuated by 3. If necessary change C81 to a value which permits this adjustment. The converter can be split into two parts: The board houses 4k bytes of program memory M3 containing the sub-routines to control the instrument from the IEEE Bus. Between the transfer of each set of segment data. To determine which options are fitted the Digital assembly sends a series of messages across the isolation barrier, decodes them on the analog side and gates them with lines from the option assemblies to feed a signal back across the isolation barrier to the micro-processor.

Switch on instrument and measure voltages on TP7 once again. The consumer is activated by a flag, set by the producer to indicate data ready in the buffer.

Switch the instrument off and disconnect the power lead. Both the front and rear panels are held together by two side extrusions running from front to rear. The signal is then fed to the switched gain inverting preamplifier whose full range output is 0. If just the Ohms or just one range of the Ohms is to be calibrated, then steps 1 and 2 in the DC Voltage Calibration table should be carried out first.


Select filter, and leave to settle for at least 30 seconds. SMHz for 50Hz line, 1. Place instrument into HOLD. DC V F3 Range: Up to volts is present inside the instrument.

Datron: Datron a Service Manual complete with schematics and partlist

This is a matched set of re- sistors for low temperature coefficient. S Reset Period At the end of a measurement cycle or in hold, the circuitry is placed dqtron a reset condition. This reset signal, applied to pins 5 and 12 of M26, allows the output of the 1st null detector to be fed back via R60 to a sample and hold capacitor Cl 2 on the integrator.

Ml 5 and Ml 7 switch the time constants, extending the overall low-frequency response down to 10Hz See Fig. The output from the latches is applied to a digital-to- analog converter, AN2.

It describes the use of ‘Spec’ mode to verify the datrom of the instrument, also providing a report sheet ‘master copy’ for compilation of permanent records. Guard is connected to Lo using a copper shorting link.

DATRON 1061A Digital Mulitmeter

Turn rear panel key switch to RUN. Adjust R35 crest factor for a display of 1.

Isolate the Digital Board by removing the connectors along the centre panel J1-J5.