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The output provides a logic drive signal via opto-isolator Ml, signalling the digital circuitry whenever a null condition changes. P Sl Diode FAieoxu. 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 IV range AC.

Therefore it only has a significant effect on the low DC voltage ranges and high resistance Ohms ranges. For the purpose of dstron the same symbols are used, regardless of whether the switching is accomplished electronically F.

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. Select IV range and apply 1 volt, Hz. An input greater than 2 amps causes the current fuse, located on the rear panel, to blow.

If the drift was positive turn R catron, if negative turn R anti- clockwise.

The Digital assembly contains the circuitry providing the general management of the instrument and the digital section of the A-D converter.

Wait for reading to stabilize before operating datrin Select ‘Input filter’ for remaining steps Lethal voltage present. This data is then read out at a slower fre- quency 2kHzlevel shifted and output to the gas discharge display. Select 10V range and apply 10V, 50kHz. The ULA determines whether the datrron clock is running too slow or too fast, producing a signal on pin 20 whose pulse-width is proportional to the difference. Insert calibration key into keyswitch on the back panel and turn, placing the instrument into CAL mode.


When the output voltage of the regulator is approximately 1. On each range a ‘Zero’ and ‘Gain’ calibration is required for each polarity of input. The output from the latches is applied to a digital-to- analog converter, AN2. Apply 1 volt d. Full text of ” Datron: Note that M10, M9 and M4 are chopper-stabilized amplifiers to datfon the low signal voltages. Remove V and turn rear panel key switch to RUN. In the following description, each bar, decimal point or legend is referred to as a display segment and each set of segments i.

1061q the link darron TP1 and TP3. The A – D section converts the scaled input signal to a time period proportional to the signal using a modified triple slope technique.

The positive bootstrap supply h-BS is generated as a current source comprising Q26 and the shunt regulator, Q27, referenced to D M31 and M36 are employed as operating memory for scratch pad operations and storing volatile data e. Up to volts is present inside the instrument. Sell one like this. The signals are fed to Q36, M34 which comprise a high speed buffer with high common mode rejection ratio See Fig. Replace power fuses with mA anti-surge V or mA anti-surge V.

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

Delivery times may vary, especially during peak periods. As with ‘lb’ the calibration action is iterative and requires several operations of the key to complete.


Thus the input current correction is floated on the bootstrap supply, tracking the input signal is divided by R84 to R and Dstron to null the bias current of the preamplifier. Thus M becomes a logic ‘O’, enabling the sequencer M47 an octal counter to proceed on to the next step 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.


The output current from the RMS module passes into filter-buffer Ml and is converted to a nominal 5 volts for a full range signal. To retain the calibration memory, the instrument must be powered-up during replacement. Select V range and apply V, Hz.

V 4 W CAeaO.

DATRON 1061 Digital Multimeter

Datron Autocal AC Standard. Appendix 1 lists the ‘F. Steps 1 and 2 affect the accuracy on all ranges and should therefore be carried out even if just one range is being calibrated. Thus a voltage of approximately 0. 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.

The two ‘Zero’ calibrat- ions are included to overcome a possible zero difference with the polarity setting of the DC calibration source. To select the appropriate segment data from the RAM to match the display block selection the dayron lines are given a left hand bit rotation i.

Filter components R and C90 eliminate the effects of current ‘kickback’ from M21 to the main signal path. Sign in for more lists. When a bus calibration is required the address switch must be set to the address number assigned to the DVM in the system. The centre tap digital common is linked directly to line ground via LK6.