Find great deals for DATRON A Digital Mulitmeter. Shop with confidence on eBay!. This is a GENUINE Datron , A, & Digital Multimeters Calibrating & Operation Manual (printed in ). This manual contains super illustrations. COMPUTE-. The Datron , A and AUTOCAL multi-function, microprocessor controlled digital voltmeters (DVM) are high precision measuring.
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This datorn the sequencer to step on once more from M, the low to high edge from pin 4 disabling the primary counter. Thus a signal of approximately 3. The major system state consists of the range, function, resolution, filter, ratio, autorange, etc.
Datron: Datron a Service Manual complete with schematics and partlist
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. To retain the calibration memory, the instrument must be powered-up during replacement. Check that display can be calibrated to The sequence is controlled by stepping M47 through QO to Q7. Connect Lo to Ohms Guard. This rather time consum- ing procedure is carried out initially during manufacture, and need only be repeated datroj replacement of Q12 or any component associated with the temperature com- pensation circuitry.
The selection of a lower range energizes relay RL1 via Q33causing resistor chain R1 R to be in series with the Hi input. Bootstrap sheet 2 Bootstrapped supplies are generated which track the input signal directly BStrack the input signal with a positive offset of -H2 V -hBS and track the input signal with a negative offset of — 12 — BS.
Thus 1061q RL1 and RL2 are energised, causing the front signal input terminals to be connected to the measurement circuits. Earth screening of the covers and guarding is provided by aluminium plates, heat-staked to the inside of the covers with electrical connections made by spring contacts.
Potentiometer R5 is adjusted to remove any offset caused by Ml and M2. Amend instrument identification label.
DATRON A Digital Mulitmeter | eBay
To eliminate errors in measurement due to lead or contact resistance, all current shunts are 4-wire sensed i. The period between calibrations depends upon the accuracy performance required from the instrument and for guidance, guaranteed accuracies for 24 0161a, 90 days and 1 year are quoted. To ensure stability at the higher feedback levels required for the 10V, V, 106a1 V ranges; C73 is switched in by Q32 to decouple M22 non-inverting input, further reducing the open loop gain.
If just the Ohms or just one range of the Ohms is to be calibrated, then steps 1 and 2 in the DC Voltage Calibration table should be carried out first.
DATRON 1061 Digital Multimeter
The low to high edge from M is fed back to M47, via M giving a master reset. Check that the display can be calibrated to See all condition datfon – opens in a new window or tab.
The calibration is carried out at one H. As long as the error is small referred to reference 0, the DVM will read the correct resistance.
DATRON 1061A Digital Mulitmeter
The output of the amplifier is attenuated by 3. In addition, if the covers 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. The board houses 4k bytes of program memory M3 containing the sub-routines to control the instrument from the IEEE Bus.
The REF 2 signal changes the state of the A line 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. This is a matched set of re- sistors for low temperature coefficient. I5;s 75 9 gois. It describes the use of ‘Spec’ mode to verify the accuracy of the instrument, also providing a report sheet ‘master copy’ for compilation of permanent records. M32 is the high inpedance buffer which tracks the inverting input of the preamplifier.
Replace power fuses with mA anti-surge V or mA anti-surge V. It may be necessary to re-adjust RMS to obtain this value.
Ml Ratio assembly from M