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The outputs of M39 -Ml and Control of the multiplexer is derived from the Digital volts supply the defined current for the reference assembly via opto-isolators M4, M5 and M6. 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. Potentiometer R62 adjusts the rectifier symmetry to provide the same output for signals of either polarity.

DATRON 1061A Digital Mulitmeter

Measure voltage on TL5. Thus depending on the position and down period of the pulse, the count held is increased or decreased. The major system state consists of the range, function, resolution, filter, ratio, autorange, etc. The sequence is controlled by stepping M47 through QO to Q7.

DATRON 1061 Digital Multimeter

Centralize R and R Select IV range AC. Check that the DVM reading is between O. Apply V, 50kHz and adjust C62 for a display of These signals zeners via R and R38 respectively.


The consumer is activated by a flag, set by the producer to indicate data ready in the buffer. H’a’e VAM ji-Ai ‘.

These side extrusions provide both slots for the handles or rack mounting ‘ears’ and locating points for the structural dahron covers. The opto-isolators invert all signals, thus M is low and M19 pins 10, 4 and 11 are high. The bootstrap circuit of Q19 presents the varicap diode.

This signal is then measured and’ compared with a stored value. Apply a short circuit to the input, short Guard to Lo and select each range in turn.

Use the ‘A-B’ computation mode to null out the reading: The varicap is thus adjusted to give the amplifier chain a flat frequency response. This means for example that calibration directly to a standard cell is possible.

Data is extracted from the counters in three bytes controlled by the A1 and AO lines of the processor address bus with the count er output buffers, M24 and Daatron being enabled by XADDT, a decoded processor address. Output 2nd Null -p. These regulators also include foldback current limiting and thermal shut-down, to provide short-circuit protection.

Check voltage on TL5 is 3. Data handled by the system consists of a stream of measurement information on which a number of operations are carried out.

Switch on instrument and measure voltage on TPS once again. The output from the latches is applied to the binary resistor ladder network, AN2, providing a step digital to analog conversion.


DATRON Digital Multimeter | eBay

This causes the RAM Ml to be placed into its write mode and the quadruple 2-line to 1-line data selector, M9, to select the ‘B’ inputs which are dateon to the processor address bus. The capacitance of varicap diode D14 is deter- mined by the bias voltage at J Thus M becomes a logic ‘O’, enabling the sequencer M47 an octal counter to proceed on to the dayron step via M Overload protection up to 2 amps is provided by diodes D13 — D In addition, if the 161a have been removed, make certain that they are correctly fitted and that the leaf contacts to the Earth and Guard Shields are in good shape.

This signal is then meas- ured and compared with a stored value.

This causes the sequencer to step on once more from M, the low to high edge from pin 4 disabling the primary counter. Q31 is ‘closed’ from M5 – 13 causing a signal of 0. Remove the oscillo- scope. In REF 2 the offset reduces by a factor of 16 giving the null reference point. Add to Watch list. Low-noise FET-pair Q35 also has low gate leakage, which maintains the effectiveness of ‘sample-and-hold’ components R34 and C