DATRON 1061A PDF

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Full text of ” Datron: For operating procedures refer to the User’s Handbook. Addresses can be found at the back of this handbook. Due to our policy of continuously updating our products, this handbook may contain minor differences in specification, components and circuit design to the instrument actually supplied.

Amendment sheets precisely matched to your instrument serial number are available on request. B Test 21 3. Ohms Select 17 3. The period between calibrations depends upon the accuracy performance required from the instrument and for guidance, guaranteed accuracies for 24 hours, 90 days and 1 year are quoted. The calibration procedures presented in the following pages should cater for most calibration situations.

If, how- ever, a special problem arises, please contact our Customer Service Section. In addition, temperature gradients around the instrument should be considered, therefore calibrate the instrument in its normal operating position and allow plenty of room for ventilation.

Warm up – It is essential that the instrument has fully temperature stabilised if the best results from cali- bration are to be achieved. Therefore, at least a 2 hour warm-up period is recommended during which time the line supply or the covers should not be removed even for a short period.

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. Calibration Source – To perform a useful calibration the accuracy of the source should always be at least four times that of the instrument being calibrated.

In most cases, examples of likely sources are given for each cali- bration function. Furthermore to arrange for the ‘Lo’ terminal of the DVM to remain at ‘earth’ throughout and let the calibration source float. If a ‘Remote Guard’ connection is necessary then examples are shown in the Operating Manual. 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.

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. Access to the non-volatile memory is gained using a key inserted into the rear panel.

When calibration is complete, the key is removed, therefore preventing acci- dental or unauthorised use of the calibration routine.

The ‘cal’ legend will be displayed on the front panel. Therefore it only has a significant effect on the low DC voltage ranges and high resistance Ohms ranges. It can be operated as often as required and independently of other calibration operations. It will be seen that successive operations of ‘Ib’ approach the final nulled value of current iteratively.

It should only be 11061a when a full calibration i. As with ‘lb’ the calibration action is iterative and requires several operations of the key to complete.

It must catron used before any DC datrom or Ohms calibration is carried out. This means for example that calibration directly to a standard cell is possible. A full explanation of the procedure is covered in section 1. This means that the instrument can be entirely calibrated remotely or under program control.

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DATRON 1061 Digital Multimeter

As mentioned in the ‘Procedure Outline’ for a manual calibration, the rear panel address switch should be set to 31, i. When a bus calibration is required the address switch must be set to the address number assigned to the DVM in the system. More details of calibration with the bus are included in section 1. Steps 1 and 2 affect the accuracy on all ranges and should therefore be carried out even if just one range is being calibrated.

On each range a ‘Zero’ and ‘Gain’ calibration is required for each polarity of input. The two ‘Zero’ calibrat- ions are included to overcome a possible zero difference with the polarity setting of the DC calibration source.

Where no tolerance is shown in this column, only the exact reading quoted with an occasional least significant digit showing is to be expected. 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. The ‘Hold’ mode may be released any time and the instrument will free run again. If ‘Error 4’ follows ‘Ib’ or ‘Lin’ or persistently appears following ‘Zero’, ‘Gain’ or ‘AcHf’ then an instrument failure may have occurred.

Datron products, number andare available as ‘Lin’ and ‘Ib’ sources and are recommended. 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. Then on each Ohms range just a ‘Zero’ and ‘Gain’ calibration is required. Two arrangements are necessary as shown in Fig. It provides tables for quick reference of accuracy on all ranges and functions in displayed digits.

On each range just a ‘Zero’, ‘Gain’ and ‘AcHf’ calibration is required. This will be necessary with the AcHf key.

DATRON 1061A Digital Mulitmeter

Datron Autocal AC Standard. IV rms Hz AC. IV rms 30 kHz AC. Do not set ‘Input filter’. Wait for reading to stabilize before operating ‘Zero’ Select ‘Input filter’ for remaining steps Lethal voltage present. Note; To reduce the effect of noise at low input levels, AC zero calibration is carried out at 0.

Guard is connected to Lo using a copper shorting link. 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. Do not set filter in. Then on each range just a ‘Zero’ and ‘Gain’ calibration is required.

Datron Autocal AC Standard with option The instrument itself 106a1 determine the polarity of the source and update the appropriate calibration memory location. An example of calibration with the Bus is given in the table below.

A complete program listing for the same calibration operation assuming an HP controller is as follows: DC V F3 Range: An exploded view of the instrument is shown in 1061s 2. Both the front and rear panels are held together by two side extrusions running from front to rear. These side extrusions provide both slots for the handles or rack mounting ‘ears’ and locating points for the structural foam covers.

The bottom cover is fitted with the tilt- stand, rubber feet and instruction card. 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. Input terminals, switches and display are mounted on the front printed circuit board pcb and the power supply on the rear pcb.

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The two side and centre pcb’s are used for interconnections between the main circuit boards. All the main circuit boards are mounted on the inner shields with hinges and quick release fasteners with flexible connections to allow operation in the ‘hinged-up’ position.

The options are mechanically fitted and require no soldering. The chassis is mounted on to the side extrusions with nylon screws, spacers and an insulation sheet to ensure that the ‘electrical spacings’ of the BSI, UL and VDE specifications are achieved.

For the purpose of explanation, each assembly will be described separately and each assembly further sub- divided according to the various functions involved. The Analog Interface receives data from the Digital assembly to control the selection, range scaling and other features of the analog circuitry. Messages between the Analog and Digital assemblies are passed via opto-isolators, electrically isolating one from the other. The DC Isolator includes the preamplifier, range scaling circuits and bootstrapped supplies.

The A – D section converts the scaled input signal to a time period proportional to the signal using a modified triple slope technique. 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. A line is also provided to instruct the micro- processor which options are present and if the AC assembly is measuring a signal above 5kHz.

The analog cir- cuitry is then interrogated to discern which options if any are fitted. Finally the analog circuitry is placed into the DC, V range until a different range or function is selected See Fig.

To determine which options are fitted the Digital assembly sends a series of messages across the isolation barrier, decodes them on the analog side and gates them with lines from the option assemblies to feed a signal back across the isolation barrier to the micro-processor. Looking at the procedure, in more detail, the Analog Interface Data ID lines are all set to a logic ‘1’except one, which is set to a logic ‘O’, depending on the option being interrogated See Fig.

As an example we will check to see if the AC option is fitted. The opto-isolators invert all signals, thus M is low and M19 pins 10, 4 and 11 are high. 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 VAL to be set high.

Ml Ratio assembly from M Both 1016a lines then return high. The ID lines are set to the appropriate pattern and the information is clocked on to M13 dstron M14 by a delayed low to high edge from Mloriginating from I A0 going low. The delay makes sure that the signal from Ml has disabled the “F. Once again, the IA0 line returns to the resting state of logic ‘1’. Once DC has been selected, the F. This is executed by clocking the ‘F.

The final step is to reselect DC as described above. The series 1061w events is the same as the power-up sequence ratron selection of dayron and range, as can be seen by comparing the two flowcharts Figs.