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The voltage produced is fed to the AC converter via connector J1 pin 11 and applied to varicap D The signals are fed to Q36, M34 which comprise a high speed buffer with high common mode rejection ratio See Fig. Quad 24 d ata sele c t t. Once the data has been extracted from the main counter the set-up procedure is then repeated to await a further trigger.

The conversion technique is electronic true RMS sensing as shown in the simplified block diagram Fig.

Datron: Datron a Service Manual complete with schematics and partlist

The signal is then fed to the switched gain inverting preamplifier whose full range output is 0. In addition, temperature gradients around the instrument should be considered, therefore calibrate the instrument in its normal operating position and allow plenty of room for ventilation.

Dll, with a high imped- ance, thus ensuring that the varicap is not shunted to ground. As mentioned in the ‘Procedure Outline’ for a manual calibration, the rear panel address switch should be set to 31, i.

B Input Current lb Compensation sheets 1 and 5 During the calibration cycle, the microprocessor notes and stores the zero error due to the bias current measured in a known source resistor. When AC volts is selected the compensation inform- ation for a particular range is recalled by the micropro- cessor, transferred across the isolation barrier and latched on to Ml 3, M14 Drawing No.

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DATRON 1061A Digital Mulitmeter

The resultant impedance presented at the input terminals is a resistance of 1ML2, shunted by pF. When AC volts is selected the compensation inform- ation for a particular range is recalled by the micropro- cessor, transferred across the isolation barrier and latched on to M13, M14 Drawing No. The REF 2 signal changes the state of the A xatron causing the analog section to ramp down at a slower rateresets the ‘null detect’ latch and enables the secondary counter of M23 Pin 13 to count the period of REF 2.

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.

A routine calibration as detailed in Section 1 should be carried out after completion of the following procedures. Personal contact with these points may result in injury.

The trigger source is selected by the latched data on M12, enabling one of the three gates of M2.

For additional information, see the Global Shipping Programme terms and conditions – opens in a new dwtron or tab. The final step is to reselect DC as described above. Where no tolerance is shown in this column, only the exact reading quoted with an occasional least significant digit showing is to be expected.

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

Copper shorting links, and a short wire link. It must be used before any DC voltage or Ohms calibration is carried out.

Thus M becomes a logic ‘O’, enabling the sequencer M47 an octal counter to proceed on to the next step via M Datron 1106a1 A flowchart for the routine is given in Fig. As in the case of the Input Current Compensation section 3. 10611a output of the block is fed back to Vf, thus closing the loop around the whole circuitry. D26 and D16 prevent the voltage on TL A from exceeding the -i-5V power rail, providing overload protection. Turn R83 anti-clock- wise until TP30 undergoes a high to low transition or begins to pulse low.


The chassis is mounted on to the side extrusions with nylon screws, spacers and an insulation sheet to ensure that the ‘electrical spacings’ of the BSI, UL and VDE specifications are achieved. Both the front and rear panels are held together by two side extrusions running from front to rear.

Note that M10, M9 and M4 are chopper-stabilized amplifiers to handle the low signal voltages. Should an overload signal then be applied, the resistor chain limits the current and the power dissipation is such that V can be applied continuously.

The function of this section datton 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. It should be noted that the calibration routine is iterative since the varicap is non-linear. The centre tap digital common is linked datrno to line ground via LK6.

When DC is selected, this information is recalled by the microprocessor, trans- ferred across the isolation barrier and latched into Ml 3 and M14, see Fig.