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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Another search for connector issues showed the input connector was hastily plugged in and darton missed a pin on the DC board, pushing it aside. The schematics for both the inguard and outguard supplies were scanned.

I am reading P is the pathway for test Ref 2 Magnitude Ratio drift.

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. Capacitors which should be replaced are marked on schematics in blue. A couple of gotchas were found during the change out.

Datron 1281 DMM Meters

Front panel No issues with front panel or display. Normal measurement 1k resistor gain noise. This is rather unusual today to see such hard keylock to protect calibration, but back then it was easy go-to solution. After recording several different pathway readings of full and fast tests, it was was the only test that was failing.


Testing VFD display output and test connections. 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. The showed a low noise source but the value was nowhere near specifications. Please include any information available about failures and what function the instrument was in prior to failure.

Mains filter have soldered earth, just like in case with HP A. All seven capacitors were changed just like the first while observing if any of the leads needed to be bent to fit the holes in the pcb. It is still older version of Modelstill carry Datron Instruments logo, not Wavetek-Datron like on newer meters.

| Datron DMM repair and calibration worklog

For any functional or calibration errors not detected by the test operations, vatron us for repair. Secondary outputs of this low voltage transformer are rectified and regulated with usual LDO s to provide clean analog supply voltages.

Not good, as this shows someone was diagnosing an issue that required the board to be possibly removed from the frame. The other leads are soldered straight to components with insulating sleeves.

It appears that the two outside connectors were placed in the opposite location. All supplies are close to as-found except the V supply.

Datron Calibration and service manual with schematics, Volume 2, Issue 2, January Service manual decode message for states: This unit comes with Options 10, 20, 30 and 70, so it have full set of boards and modules to play with.


Fuse Tests Fuse is open circuit. Just like the first nothing else 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. To avoid issues with battery, simple FRAM adapter board was designed and manufactured.

There used to be magnets to keep handles locked in place. A screw was also missing that held the connector in place. After capacitor replacement and reassembly meter satron Error code Possibly one of the daughterboards was failing?

Ref- Magnitude Ratio drift. It does not look good, but Datron engineers knew what they are doing.

After the first repair, it was determined to wait darron see if the meter would still pass diagnostics based on the chances of damaging another part. The Current assy was installed in the previous and a fast self-test was performed without errors. The original three errors were gone, but a new error had been added from the AC assy. Its voltage was measured at 3.