VXI VT1422A User Manual
Page 168
166 Advanced Programming with the VT1529B
Figure 5-1. Sequence for VT1529B Strain Conversion
Periodic Calibration
Retrieve readings from
FIFO and/or CVT
Trigger event for each pass
through Scan List
Set up Trigger System to scan
strain bridge channels
Set up the analog input Scan List
Measure unstrained bridge output
voltages and send to EU routines
Send gage factors to
channel EU routines
To convert readings to
Engineering Units of strain
hpe1422_cmd(vi, "SENS:FUNC:STR:<bridge_type>:POST
Also sets bridge config switches and turns on excitation V
hpe1422_cmd(vi, "SENSe:STRain:GFACtor
,(@
)");
<factor>
<ch_list>
hpe1422_cmd(vi, "MEASure:VOLTage:UNSTrained? (@
)");
<ch_list>
hpe1422_cmd(vi, "ROUTe:SEQuence:DEFine (@
,
)");
<ch_list> <exc_ch>
hpe1422_cmd(vi, "TRIG:SOURce
");
<source>
Similarly with TRIG:COUNt, ARM:SOURce, TRIG:TIMer
Set up Sample Timer for best
channel-to-channel scan rate
Initiate Trigger System
hpe1422_cmd(vi, "SAMPle:TIMer 40e-6");
hpe1422_cmd(vi, "INITiate:IMMediate");
hpe1422_cmd(vi, "*TRG"); (if TRIG:SOUR HOLD set)
EXTernal trig, TTLTRGn signal, or TRIG:TIMer
hpe1422_readFifoPost_Q(vi, , ,
&
rdgs_array);
<n_scans> <n_extra>
Set Input Filter on VT1529B
hpe1422_cmd(vi, "INPut:FILTer:FREQuency
");
<freq>
Must include excitation voltage channel.
hpe1422_cmdInt32_Q(vi, "*CAL?", &result);
hpe1422_cmdInt32_Q(vi, "CAL:REM? (@
)", &result);
<ch_list>
hpe1422_cmd(vi, "INPut:FILTer:STATe
");
<state>
hpe1422_cmd(vi, "TRIG:IMM");
<range>
<exc_ch>
<ch_list>
,(@
),(@
)");