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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Connect oscilloscope Lo to TP28 and monitor M53 pin If the AC option is not fitted M is driven low via R55 from Mlcausing M to be high, producing a logic ‘0’ —15 volts on M It is also bootstrapped tracking of both ground lines and supply voltages with input signal being essential for correct operation of input bias compensation, temper- ature compensation and common mode rejection.
I5;s 75 9 gois. Digital and analog assemblies.
NB R39 and R40must each be at least kilohms. Guard is carried via the cable screens, thus guarding the signals during transfer. This signal is then meas- ured and compared with a stored value. The AC set-up procedure is now complete. This signal is then measured and compared with a stored value. The circuitry is placed into the. Note that M10, M9 and M4 are chopper-stabilized amplifiers to handle the low signal voltages.
No additional import charges on delivery. For additional information, see the Global Shipping Programme terms and 1061x – opens in a new window or tab This amount includes applicable customs duties, taxes, brokerage and other fees.
Th e A-D con trol latches. Carry out the Specification Verification tests Sec- tion 8, User’s Handbook and recalibrate if necessary. To retain the calibration memory, the instrument must be powered-up during replacement. When Rear Input is selected either remotely or on the rear panel of the instrument and the RATIO key is depressed, the 106a1 circuitry, under microprocessor control, selects the ratio reference input then the rear signal input, taking one valid reading at each stage.
Furthermore to arrange for the ‘Lo’ terminal of the DVM to remain at ‘earth’ throughout and let the calibration source float.
Repeat until display reads less than 50 digits. On each range a ‘Zero’ and ‘Gain’ calibration is required for each polarity of input.
Datron: Datron a Service Manual complete with schematics and partlist
When Ohms or Current is selected, the DC Isolator or AC assembly is also used in the measure- ment procedure as seen in the following table. The board contains 2k bytes of program memory Mil containing the sub-routines to control the instrument from the BCD Interface.
Remove the top cover. ZooooZ 2 Daatron, the Display Driver assembly receives the display information from the microprocessor running at kHz and stores it in a Random Access Memory RAM digit by digit. IV rms 30 kHz AC. The delay makes sure that the signal from Ml has disabled the “F.
Sandwich, Illinois, United States. Remove the oscillo- scope. Quad 24 d ata sele c t t. B Input Current lb Compensation sheets 1 and 5 During the calibration cycle, darton microprocessor notes and stores the zero error due to the bias current measured in a known source resistor.
DATRON 1061 Digital Multimeter
The output is potentially divided by R7 and R8 so that 1 volt full range is presented to Ml, another unity gain amplifier. Ml Ratio assembly from M The ID lines are set to the appropriate pattern and the information is clocked on to M13 and M14 by a delayed low to high edge from Mloriginating from I A0 going low.
Transformers T1 and T2 are of toroidal construction mounted one on top of the other and bolted to the rear panel. Q5 ‘closed’ from M causing R8 9.
T1 has a split primary comprising two V windings, intended for either series or parallel connection depending on the line voltage. Select V range and apply V, Hz. Guard is not directly linked to the front panel Lo terminal, as this becomes active in 4-wire Ohms. Voltage on TL5 TL1! Latched data from the microprocessor is passed through opto-isolators, decoded and latched again on an analog assembly to select function, range, test, average and the D – A converter set up conditions.
When a command is input, level 1 is updated e. Learn more – opens in a new window or tab. The signal indicating the end of this period is passed via M causing the sequencer to carry on to the next step. Q5 ‘closed’ via M causing a small signal to be injected into the feedback path of the input amplifier.
GENUINE DATRON A DIGITAL MULTIMETER OPERATING & CALIBRATION MANUAL | eBay
MC BCP 7!!! This causes the sequencer to step on once more from M, the low to high edge from pin 4 disabling the primary counter. Thus the input current correction is floated 106a the bootstrap supply, tracking the input signal is divided by R84 to R and R to null the bias current of the preamplifier. R compensates for the bias current of Ratron, whileR trims the offset voltage to zero.
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