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comparison doc/CMU200-notes @ 0:bd62be88259d

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initial import of rfcal code and docs from freecalypso-tools repository
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 20 May 2017 18:49:35 +0000
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1 R&S CMU200 is the RF tester used for production RF calibration of FreeCalypso
2 GSM devices. The CMU200 can be operated in three ways: manually via the front
3 panel, programmatically via GPIB and programmatically via SCPI commands over
4 RS-232. GPIB is the industry standard, but for FreeCalypso the Mother has
5 adopted the RS-232 control interface method instead in order to avoid the
6 exotic hardware and equally exotic drivers and libraries required for GPIB:
7 using the RS-232 interface requires absolutely no special hardware or drivers
8 or libraries, just userspace C code without any dependencies talking to a
9 serial port just like we do when communicating with Calypso target serial ports.
10
11 Initialization commands
12 =======================
13
14 Our Test System Interface Daemon for the CMU200 will issue the following SCPI
15 commands to the instrument on start-up:
16
17 *SEC 0
18 *RST;*OPC?
19 SYST:NONV:DIS
20 SYST:REM:ADDR:SEC 1,"RF_NSig"
21 SYST:REM:ADDR:SEC 2,"GSM900MS_NSig"
22 SYST:REM:ADDR:SEC 3,"GSM1800MS_NSig"
23 SYST:REM:ADDR:SEC 4,"GSM1900MS_NSig"
24 SYST:REM:ADDR:SEC 5,"GSM850MS_NSig"
25
26 VCXO calibration
27 ================
28
29 When commanded to prepare for VCXO calibration, our TSID will command the
30 CMU200 as follows:
31
32 *SEC 2
33 RFAN:CHAN 40CH
34 RFAN:TSEQ GSM5
35
36 Command to read frequency offset:
37
38 READ:MOD?
39
40 Signal generator mode
41 =====================
42
43 Turn signal generator on:
44
45 *SEC 1
46 SOUR:RFG:LEV <level_in_dbm>
47 SOUR:RFG:FREQ <freq_in_hz>
48 INIT:RFG
49
50 Turn signal generator off:
51
52 ABORT:RFG