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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Datron and are the using unusual arrangmenet for main voltage reference.

Datron 1281 8.5 DIGIT Selfcal Digital Multimeter – Faulty

Quick check after assembly, with short on input terminals: Credits for storing these manuals goes to KO4BB.

Capacitors which dayron be replaced are marked on schematics in blue. No signs of burning though.

But thankfully, we got and able to share full datasheet for DCE2. At least one positive lead is soldered to the pcb in through a pad but it is not usually shaped for the polarity square-vs-round. Both meters show zero errors after tests. The 121 two capacitors were surrounded by other parts preventing them from being changed easily. The power was left on and a battery powered soldering iron was used. Schematics clickable for PDF. Fluke A have combined Guard terminal, switchable between passive or active mode.

All tests completed now without errors. The outguard supplies located on this PCBA were measured once suitable test points were found:. The Fast test failure code is explained in section 2. After capacitor replacement and dattron meter throwing Error code Looking at the wires an interesting issue was found. Heatshrink was added to the P and N wires. All seven capacitors were changed with only one gotcha.


DATRON 1281 8.5 DIGIT Selfcal Digital Multimeter

It was also found that a plastic spacer that sits between the board and one of the standoffs was no longer in place. It was now measuring Secondary outputs of this low voltage transformer are rectified and regulated with usual LDO s to provide clean analog 1821 voltages.

Without further diagnosing of the error, the inguard and outguard supplies needed to be tested as the parts have datecodes from and the lithium backup battery is dated from Just like the first nothing daron had changed so it will be recommended that all supplies be checked even if the manual states they are not part of the affected assembly.

Good rule of thumb is to replace all batteries if instrument is older than 10 128.

Datron – DMM Meters

This unit comes with Options 10, 20, 30 and 70, so it have full set of boards and modules to play with. First transformer converts mains to low voltage supply for earth-referenced digital domain, and powers low-voltage PWM DC-DC around second transformer, with switching frequency in sync with mains.

The and test both use the Ohms 10mA current source. The Current assy was installed in the previous and a fast self-test was performed without errors. If you would like to support us by making a donation please click dstron Paypal button: The power input filter was replaced.


The original three errors were gone, but a new error had been added from the AC assy. Service manual decode message for states: Hopefully they will continue to work few more decades. The board was removed and inspected closer under magnification.

DATRON DIGIT Selfcal Digital Multimeter | eBay

Other repairs The lithium battery was replaced with a TLP. The meter came up with no checksum errors. Test Instructions These instruments can produce or measure lethal voltages at their terminals. The lithium battery was replaced with a TLP.

Common Failures Misapplication of voltage or current — The can be damaged by sourcing high voltage into resistance or current functions.

It looked good with the input shorted, however the Datroj s readings were open. The serial number was still correct as was the line frequency, as expected.

Meter was failing with error message — C03 immediately after power on. The remaining capacitors had no additional gotchas. DMM front face Image 2: