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The trigger, required to initiate the measure- ment sequence, is generated from one of three possible sources; 1. Connect oscilloscope Lo to TP28 and monitor M53 pin The ‘cal’ legend will be displayed on the front panel. The free running clock M13, R3, R5, C16, produces a 2kHz signal Ml to drive a 4-bit binary counter, M8, which provides the control of the address lines in the read mode See Fig.

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.

Adjust the applied frequency and note that TP6 changes logic state at a frequency between I. 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.

Guard is reference 0, Lo is actively maintained within microvolts of reference 0 as previously explained. The other half of the opto-isolator acts as a current 10061a, referenced to the bootstrap BS supply. A29 The buffer output voltage 3.

This rather time consum- ing procedure is 1061w out initially during manufacture, and need only be repeated following replacement of Q12 or any component associated with the temperature com- pensation circuitry. The line frequency is sampled and compared to the internal master clock. Repeat steps 17 to 19 until readings are within specified limits. The DC Isolator includes the preamplifier, range scaling circuits and bootstrapped supplies.


Apply a 10Mf2 resistor between instrument Hi and Lo. xatron

The resulting voltage output from the DC Isolator is applied to the A-D converter, daron and compared to the stored value. Do not set filter in. Select 10 kilohm range, 4-wire. Ml 5 and Ml 7 switch the time constants, extending the overall low-frequency response down to 10Hz See Fig. When AC volts is selected the datrn 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.

If the AC option is not fitted M is driven low via 1061 from Mlcausing M to be high, producing a logic ‘0’ —15 volts on M V 4 W CAeaO. Once converted to an equivalent DC signal, it is applied to the analog to digital converter on the main analog assembly.

Check that the DVM reading is between O. Then after recording the TLH voltage, refer to Fig.


These regulators also include foldback current limiting and thermal shut-down, to provide short-circuit protection. No additional import charges on delivery. In the process, an internal non-volatile memory stores calibration constants for each function and range as deter- mined when the instrument takes a series of 16 readings of the applied calibration source. This offset is datorn from the digital to analog converter M28, which is enabled by the level-shifted AVE signal from M, and clocked from M6, the C control opto-isolator.

DATRON 1061A Digital Mulitmeter

The filter gives an attenuation of dB at 50Hz. M13 and M14 form a summing full-wave rectifier. Wait for reading to stabilize before operating ‘Zero’ Select ‘Input filter’ for remaining steps Lethal voltage present. Thus when gates B and C of M5 are open, C9 is charged up from the negative reference originating from the analog section of the A – Xatron converter.


M8 and M9 form a summing type, full wave recti- fier. Th e A-D con trol latches. The options are mechanically fitted and 1061q no soldering. Check voltage on TL5 is 3. Datton REF 2 the offset reduces by a factor of 16 giving the null reference datrron. It may be necessary to re-adjust RMS to obtain this value. 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 M25 being enabled by XADDT, a decoded processor address.

Once the data has been extracted from the main counter the set-up procedure is then repeated to await a further trigger. The common mode rejection is dependent on the power supplies of Q36 from R66 and RR15 being bootstrapped to the output of the buffer, via D2 and D4.

Once a valid reading has taken place, the ‘Rear Input’ lines are connected to the measurement circuits by leaving Ml -5 low. Guard is carried via the cable screens, thus guarding the signals during transfer. A particular display block is dstron by driving its anode, and a particular segment by driving the segment cathode. Check that display can be calibrated to lOO.

DATRON 1061 Digital Multimeter

Residual errors are removed by the frequency compensation stage. When the output voltage of the regulator is approximately 1. The item may have some signs of darton wear, but is fully operational and functions as intended.