[time-nuts] Z3817A manual or details?

christopher hoover ch at murgatroid.com
Fri Jun 19 20:12:16 EDT 2009


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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