I've got an HP 58503A purchased from China a couple of years ago. It has a bit of a hard life, having been in water at some time. But it seems to work ok, as far as I can tell. Today there was a power failure for 5 minutes or so. The red ALARM LED is on. It is not clear to me why, although of course I'm aware there was a power outage, which almost certainly caused this, although I can't be 100% sure.
Could it be that the log is full? I had a program running trying to get the position multiple times in a loop, to get some sort of average, so I can well believe I filled the log up. But this was a few weeks ago. The log is clearly full . scpi > diag:log:read:all? Log status: Full Log 001:19970504.00:00:00: Log cleared Log 002:19970504.00:00:00: System preset Log 003:19970504.00:00:00: Power on .... Log 219:20170107.05:30:17: Position hold mode started Log 220:20170107.05:30:57: Holdover started, not tracking GPS Log 221:20170107.05:31:03: Survey mode started Log 222:20170107.05:33:04: GPS lock started Nothing has been logged since 7th January. I know for a fact there was a power outage on the 19th and today (25th), so I suspect the log being full has NOT caused the ALARM light to come on. A fault, that is not logged, has caused it. scpi > SYSTEM:STATUS? ------------------------------- Receiver Status ------------------------------- SYNCHRONIZATION ............................................. [ Outputs Valid ] SmartClock Mode ___________________________ Reference Outputs _______________ >> Locked to GPS TFOM 3 FFOM 0 Recovery 1PPS TI +9.5 ns relative to GPS Holdover HOLD THR 1.000 us Power-up Holdover Uncertainty ____________ Predict 432.0 us/initial 24 hrs ACQUISITION ................................................ [ GPS 1PPS Valid ] Tracking: 6 ____ Not Tracking: 1 ________ Time ____________________________ PRN El Az SS PRN El Az UTC 15:03:50 25 Jan 2017 5 23 186 73 24 21 252 GPS 1PPS Synchronized to UTC 13 84 110 81 ANT DLY 0 ns 15 59 289 94 Position ________________________ 20 45 245 96 MODE Hold 28 51 76 104 30 27 68 83 LAT N 51:39:04.155 LON E 0:46:36.381 ELEV MASK 20 deg HGT +45.55 m (MSL) HEALTH MONITOR ...................................................... [ ERROR ] Self Test: Err Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv: OK scpi > The self-test shows an error, but no indication what the error was, as the log was full. I have a fairly good idea what may have happened. Sometimes when the unit is powered on, the voltages on the PSU appear to go out of spec. I'm not convinced this is really happening, as a multimeter on peak hold could not catch any glitch, but I have not tried a fast scope. I'm just wondering if there's anything else I can do to see what caused the LED to come on. I suspect if I execute the self-test, it will pass and the light go out, but I'd rather find the reason before doing that. Dave _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.