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Short Hi to Lo. The reset signal applied to M26 pins 6 and 13 merely allows a lower impedance path between the buffer and the integrator to speed up the settling time as C9 is discharged to zero.

When Rear Input is selected either remotely or on the rear panel of the instrument and the RATIO key is depressed, the switching circuitry, under microprocessor control, selects the ratio reference input then the rear signal input, taking one valid reading at each stage.

Therefore, at least a 2 hour warm-up period is recommended during which time the line supply or the covers should not be removed even for a short period.

DATRON A Digital Mulitmeter | eBay

Skip to main content. Positive temperature coefficient thermis- tors R3, R4 and diodes D1, D2, protect the Analog Output circuitry from accidental input applied to the Analog Output external connector.

Voltage on TL5 TL1! Switch on instrument and measure voltage on TPS once 161a. IV rms 30 kHz AC. This forces a full- wave rectified current to flow in RMS module M6.


Datron: Datron a Service Manual complete with schematics and partlist

Additionally, at this time, the level 1 to level 2 transfer is repeated and the measurement circuits again updated to allow for commands received while the conversion is in progress. Select 10V range and apply 10V, 50kHz. Thus the inputs to the ‘Ratio Input’ on the rear panel are connected to the measurement cir- cuits. Input terminals, switches and display are mounted on the front printed circuit board pcb and the power supply on the rear pcb.

Limit stores and computation stores. At the same time the reset line M is taken high turning on M If the display reads within the limits -t A29 The buffer output voltage 3.

DATRON 1061 Digital Multimeter

It describes the use of ‘Spec’ mode to verify the accuracy of the instrument, also providing a report sheet ‘master copy’ for compilation of permanent records. Check that display datronn is 1. Check display is lOO.

The WAIT pulse resets the counter of M23 via M, keeps the A line to the analog section low, clocks the polarity null detect latch M22 B causing a logic ‘1’ on pin 1 if the signal applied to the analog section of the A-D converter was positive logic ‘0’ if negative and is fed back to enable the sequencer via M Each ‘Q’ output from M47 goes to logic-1 to activate its stage of the sequence; completion of one stage generates the ‘Enable’ for the next, via M46 switches.


Adjust R12 on the Rear Power Sup- ply pcb assembly to give — Since A8 and A9 are not decoded there are images starting at, Check that display can be calibrated to lOO.

The function of this section of the circuitry is to generate the sequence that when transferred to the analog section, controls the sequence from RESET through the integration cycle and back to RESET. The memory can be split into five main areas: It should be noted that the calibration routine is iterative since the varicap is non-linear. Looking datdon the procedure, in more detail, the Analog Catron Data ID lines are all set to a logic ‘1’except one, which is set to a logic ‘O’, depending on the option being interrogated See Fig.

If outside these limits, the cal stores should be cleared as described in para 4. This signal contains about mV peak to peak high frequency noise.

Use the ‘A-B’ computation mode to null out the reading: Once converted to an equivalent DC signal, it is applied to the analog to digital converter on the main analog assembly. R75 is adjusted for optimum linearity.

A chopper-stabilized amplifier M21 nulls the offset of Q