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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Error was added after repairing Digital and DC assys.

Low Thermal | Repair | Wavetek/Datron

Without further diagnosing of the error, the inguard and outguard supplies needed to dxtron tested as the parts have datecodes from and the lithium backup battery is dated from Age — Very old instruments can suffer from age related failures caused by normal deterioration of components and assemblies over time.

Repair workflow, unit 2 This second unit actually happens to be the the first Datron acquired. I am reading Patent data Secondary outputs of this low voltage transformer are rectified and regulated with usual LDO s to provide clean analog supply voltages.

Fluke A have combined Guard terminal, switchable between passive or active mode. Gain resistors were already measured and with shorted relay contacts to make sure they are working. The fast self-test returned the following errors including test limits from the service manual: While testing optocouplers with second Datronit was noticed that error codes were different on second meter if optocouplers were left out of circuit.


There was concern that additional heat could have caused issues with the aging xatron.

There are no official man manufacturer service for this old DMM s anymore, so hopefully we will not need custom unobtainable components, as that can easily datrno repair into BER. Testing Steps If the instrument is smoking or has a bad smell coming from it turn it off immediately and contact us for further instruction.

Fuse Tests Fuse is open circuit. The old lead was left on the part and the new lead was soldered next to it. Test points for the DC board were easily found as Datron did not use silkscreening on their boards and used unmasked copper for the TP numbers on the DC board. The board was removed and inspected closer under magnification.

Testing should only be performed by qualified technicians. Quick check after assembly, with short on input terminals: DMM rear face Teardown Datron and lesser brother using interesting arrangement for primary power supply with two big toroidal transformers.

Datron Calibration and service manual with 12281, Volume 2, Issue 2, January Some cobwebs were also found around the power supply area.

Datron 1281 8.5 DIGIT Selfcal Digital Multimeter – Faulty

All supplies are close to as-found except the V supply. It was bought by Vishay in early All but two capacitors daron replaced on the DC board 12 of DMM rear face Display: Testing VFD display output and test connections Image 4: It can measure direct voltage and current, alternating voltage and current, and resistance. No repair required here.


We already know, that temperature changes are our main enemy in high precision voltage and current measurements, so Datron had to make extra effort to reduce instability of temperature contributors, instead of adding fans or heat sinks around critical components.

The power supply and ribbon cables also need to be disconnected. Its voltage was measured at 3. It looked good with the input shorted, however the OHM s readings were open. All errors satron now gone and a fast looptest passed after 24 iterations.

Datron – DMM Meters

To avoid issues with battery, simple FRAM adapter board was designed and manufactured. Datron Service manual, Calibration and servicing.

Run the fast test from the test button menu. Normal measurement k Ohm resistor gain noise. DMM front face Image 2: