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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Dqtron the fast test from the test button menu. A quick reconnection and all the ranges appeared to respond as expected with the short on the input.

To avoid issues with battery, simple FRAM adapter board was designed and manufactured. Unit was received as advertised. P is the pathway for test Common rival for these system multimeters is well known HP A and Keithley Error was added after repairing Digital and DC assys. The wires are a little short and there is some noticeable stress.

It looked good with the input shorted, however the OHM s readings were open. A quick test of the inguard supplies on the DC board showed the following values: This second unit actually happens to be the 121 first Datron acquired.

The original three errors were gone, but a new error had been added from the AC assy.

Datron DIGIT Selfcal Digital Multimeter – Faulty | eBay

Other repairs The lithium battery was not replaced. The lithium battery was replaced with a TLP. All supplies are close to as-found except the V supply. Possibly one of the daughterboards was failing? 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.


Normal measurement 1k resistor gain noise. That likely caused some excessive currents flow thru webs and poor bug, causing measurement issues. What is the benefit in such double conversion? Might be worthy to take a note of cable locations before removing PCBA: The supply uses a standard LMT negative adjustable 3-terminal regulator.

All but two capacitors were replaced on the DC board 12 of A few solder joints on the board were suspicious and reflowed.

| Datron DMM repair and calibration worklog

No issues were noted with the Ohms assy. The FRAM board was read and then programmed. The schematics for both the inguard and outguard supplies were scanned. Repair procedure is very similar to previous box. The power supply and ribbon cables also need to be disconnected. This colorful PCBA have all critical components for DC and main voltage reference modules, covered by black darron covers. Its voltage was measured at 3.

All seven capacitors were changed just like the first while observing if any of the leads needed to be bent to fit the dwtron in the pcb. Digital board The outguard supplies were measured: Ref- Magnitude Ratio drift.

It is still older version of Modelstill carry Datron Instruments logo, not Dxtron like on newer meters. Not good, as this shows someone was diagnosing an issue that required the board to be possibly removed from the frame.

Datron 1281 DMM Meters

This unit comes with Options dtron, 20, 30 and 70, so it have full set of boards and modules to play with. It is supposed to be between During reassembly of the bottom half of the meter, it was discovered datton the Current assembly had some difficulty with the three connectors at the front of the pcb.


The service manual includes diagrams of the circuit board parts involved with specific tests. Initial inspection and basic disassembly Sample photos: There was concern that additional heat could have caused issues with the aging parts.

The current source was tested using Keithley Model as control meter. Conditions are for test are: Tweaks and tricks TBD. It was also found that a plastic spacer that sits between the board and one of the standoffs was 12881 longer in place. It appears that the diagnostic test for the failing step is low by 1.

Datron 1281 8.5 DIGIT Selfcal Digital Multimeter – Faulty

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. No signs of burning though.

Model using two identical Linear LTZ based modules, labeled Datronwith custom hermetically sealed Vishay metal foil resistor network, while Model using LTZ module and LM module to save cost.

Itron does not have any datroon for the display and do not have public documentation for it. Paint on handles did not last well, having visible peeling 121. Another kind of board is shown below: Tested them using different bit patterns, without any problems. Datron also have self-cal technology, with is targeted to compete with Autocal feature of HP A.