DATRON 1281 PDF

Find great deals for Datron DIGIT Selfcal Digital Multimeter – Faulty. Shop with confidence on eBay!. Wavetek/Datron Multi-Product Calibrator .. The from Wavetek/Datron is a high performance, 8½ digit bench top multimeter. It can measure direct voltage. Datron repair. «on: January 26, , am». Hey. «Last Edit: February 02, , am by whatamidoing». Logged.

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The meter came up with no checksum errors.

DATRON DIGIT Selfcal Digital Multimeter | eBay

Good rule of thumb is to replace all batteries if instrument is older than 10 years. No issues were noted with the Ohms assy. It is measuring value through DC range, so it is a good possibility that offset on DCV measurement causing self-test for fail. After capacitor replacement and reassembly meter throwing Error code Digital board The outguard supplies were measured: Option 30 — Current Converter Current shunt resistor network consist of separate set of resistors: As usual, all photos are clickable for high-resolution version.

Might be worthy to take a note of cable locations before removing PCBA:. I am reading These instruments can produce or measure lethal voltages at their terminals. The power input filter was also replaced as a precaution. Capacitors which should be replaced are marked on schematics in blue.

First transformer converts mains to low voltage supply for earth-referenced digital domain, and powers low-voltage PWM DC-DC around dafron transformer, with switching frequency in sync with mains. But thankfully, we got and able to share full datasheet for DCE2.

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The power was left on and a battery powered soldering iron was used.

Datrln power supply and ribbon cables also need to be disconnected. A quick reconnection and all the ranges appeared to respond as expected with the short 121 the input.

Report as many as you reasonably can. Satron all chips would be a good idea, considering age 12281 the instrument and unknown history.

The datrob two capacitors were surrounded by other parts preventing them from being changed easily. The Digital board, however, has no markings and does not match the component layout drawing in the service manual. The remaining capacitors had no additional gotchas. All credits with discussion and raw content, photographs and testing go to him. The board and rear cover come out as one assembly. The serial number was still correct as was the line frequency, as expected.

It does not look good, but Datron engineers knew what they are doing. There are different versions of with options keys, such as: Schematics clickable for PDF.

Front panel No issues with front panel or display. In out units refereces were enclosed in black epoxy, and would be troublesome to remove from PCB for teardown. Any failure or operational deficiency information available allows us to provide the best service. After the first repair, it was determined to wait and see if the meter would still pass diagnostics based on the chances of damaging another part.

Datron 1281 8.5 DIGIT Selfcal Digital Multimeter – Faulty

All seven capacitors were changed just like the first while observing if any of the leads needed to be bent to 181 the holes in the pcb. Many bodge wires, reworks, hanging components from bottom PCB side, cut traces show amazing lot of debug and service on these instruments even after they went on market.

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If you willing to contribute or add your experience regarding test instruments repairs or provide extra information, you can do so following these simple instructions. Patent data Secondary outputs of this low voltage transformer are rectified and regulated with usual LDO s to provide clean analog supply voltages.

DMM rear face Teardown Datron and lesser brother using interesting arrangement for primary power supply with two big toroidal transformers. Datroj good, as this shows someone was diagnosing an issue that required the board to be possibly removed from the frame. Please include any information available about failures and what function the instrument was in prior to failure. It is hoped that the capacitor replacement will cure the DCV Error as it did on the first meter.

Credits for storing these manuals goes to KO4BB. This series error usually means bad communication datdon one of option boards. Datron and lesser brother using interesting arrangement for primary power supply with two big toroidal transformers. We will look into those later on, after repair.

Meter was failing with error message — C03 immediately after power on. It is still older version of Modelstill carry Datron Instruments logo, not Wavetek-Datron like on newer meters.