Anyone else playing with one of these Z3817A boxes that are/were
available on that marketplace which shall not be named?
The Z3817A appears to be essential a discipling box for an E1938. I'm
still not sure yet what the disciplining input is.
I'd love a manual, but I haven't found one yet. So I've been doing
some reverse engineering.
On the TIB (P1) DB-25 connector, I'm fairly confident about these:
V+ pins 1 and 21
V- pins 8 and 25
10MHz #1 pins 2/15 xfmr coupled, ~4.6V into 1M
10MHz #2 pins 23/16 xfmr coupled, ~4.6V into 1M
1PPS pin 14
Supply voltage is dictated by Lucent DC-DC converter. Input is 18-36V,
1.9A.
Still chasing down the other pins. Currently I am working on a possible
disciplining input:
input of some kind to U6/3 via 100 ohms pin 18, prob. diff with 4
input of some kind to U6/2 via 100 ohms pin 4, prob. diff with 18
The MMI (J1) DB-9 connector is RS-232, 9600baud, 8n1 and runs a a
familiar SCPI interface as you can see:
scpi> *IDN?
HEWLETT-PACKARD,Z3817A,3832A03064,3752-A
scpi> :SYSTEM:STATUS?
SYNCHRONIZATION ........................................... [ Outputs
Invalid ]
SmartClock Mode ___________________________ Reference Outputs
_______________
Locked TFOM 9
FFOM 3
Recovery 1PPS TI --
Holdover HOLD THR 1.000 us
>> Power-up: TIMEREF1 invalid Holdover Uncertainty
____________
Predict --
ACQUISITION ................................... [ TIMEREF1 (GPS) 1PPS
Invalid ]
Tracking: 0 ____ Not Tracking: 0 ________ Time
____________________________
TIME --:--:-- [?] --
--- ----
GPS 1PPS Invalid: not tracking
ANT DLY --
Position
________________________
MODE Hold
LAT
--
LON
--
ELEV MASK -- HGT
--
HEALTH MONITOR .........................................................
[ OK ]
Self Test: OK | Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS
Rcv: OK
scpi >
-ch
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