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The output from the latches is applied to a digital-to- analog converter, AN2. Turn rear panel key switch to RUN. Two arrangements datrin necessary as shown in Fig.
Access to the non-volatile memory is gained using a key inserted into the rear panel. A simplified diagram of this arrangement is shown in Fig. The output of the block is fed back to Vf, thus 101a the loop around the whole circuitry. 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. Q5 ‘closed’ from M causing R8 9. Carry out the Specification Verification tests Sec- tion 8, User’s Handbook and recalibrate if necessary.
Note that M10, M9 and M4 are chopper-stabilized amplifiers to handle the low signal voltages.
DATRON 1061 Digital Multimeter
Sign in for more lists. The multiplexer is then placed in a reset condition ready for the next measurement The resistor chains RR43 and RR90 are binary cycle.
This data is then read out at a slower fre- quency 2kHzlevel shifted and output to the gas discharge display. The signal is then fed to the switched gain inverting preamplifier whose full range output is 0. This signal is then meas- ured and compared with a stored value. M19 and M20 are backed up by a battery to privide the non-volatile ‘Calib- ration’ and ‘Zero’ memory.
In the following description, each bar, decimal point or legend is referred to as a display segment and each set of segments i. The basic DC only instrument set-up procedure is complete. 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.
Connect oscilloscope Lo to TP28 and monitor M53 pin If a ‘Remote Guard’ connection is necessary then examples are shown in the Operating Manual. Output Buffer Check The circuitry is placed into the.
Isolate the Digital Board by removing the connectors along the centre panel J1-J5. These signals zeners via R and R38 respectively. Internally, each of the readings is deviated by one sixteenth of a digit and when an average is taken, the instrument is able to resolve to better than one least significant digit displayed.
R90 is the zero adjustment for the half wave rectifier M8 and R35 is the high crest factor gain adjustment. Connect Lo to Ohms Guard. In REF 2 the offset reduces by a factor of 16 giving the null reference point. The AC set-up procedure is now complete. Switch off instrument and make negative reference links A to C, if cut i.
The analog circuitry conditions for each test are given in the last subsection of the circuit description for the particular board, and the range ‘F. Email to friends Share on Facebook – opens in a new window or tab Share on Twitter – opens in a new window or tab Share on Pinterest – opens in a new window or tab. Learn more – opens in a new window or tab Postage: Repeat 17 and 18 until the 50kHz and kHz readings are separated by less than 20 digits.
If, how- ever, a special problem arises, please contact our Customer Service Section. Apply IV 50kHz and adjust C63 for a display of 1. Thus the processor under remote control is able to ‘simultaneously’ set up the requirements for the next reading, convert the current reading and process the last one.
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 connected to the processor address bus. The instrument itself can determine the polarity of the dqtron and update the appropriate calibration memory location.
GENUINE DATRON A DIGITAL MULTIMETER OPERATING & CALIBRATION MANUAL | eBay
Repeat until display reads -H 0. The REF 2 signal changes the state of the A line causing the analog section to ramp down xatron a slower rateresets the ‘null detect’ latch and enables the secondary counter of M23 Pin 13 to count the period of REF 2.
Thus the input current correction is floated on the bootstrap supply, tracking the input signal is divided by R84 to R and R to null the bias current of the preamplifier. 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.
Synchronisation is achieved by adjusting the master clock frequency. Datrob consumer is activated by a flag, set by the producer to indicate data ready in the buffer. Repeat steps until both readings are within the limits indicated.
Q31 is ‘closed’ from M causing a signal of 0. The output provides a logic drive signal via opto-isolator Ml, 10061a the digital circuitry whenever a null condition changes. Ensure that the DVM used for measurement is correctly zeroed! The series of events is the same as the power-up sequence for selection of function and range, as can be seen by comparing the two flowcharts Figs.