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Pre- and Post-Arm Readings
This program demonstrates:
• how to program the digitizer to take a minimum of 100 pre-arm
readings and 100 post-arm readings.
• how to set the arm source to an external signal applied to the "Ext 1"
BNC.
PREPOST.C
*RST;*CLS /* reset and clear the digitizer */
CONF1:ARR:VOLT (200),2,(@3) /* set 200 readings total, 2V range, */
/* Diff input port 3*/
ARM:SOUR1 EXT /* arm source is front panel "Ext 1" BNC */
SENS1:SWE:OFFS:POIN -100 /* set 100 pre-arm readings */
INIT /* put digitizer in wait-for-arm state */
FETCH? /* retrieve pre- and post-arm readings */
Comments 1. Pre-arm and Post-arm Reading Count. When measurements consist of
pre- and post-arm readings, there must be at least three pre-arm readings
and seven post-arm readings specified. Note that pre-arm readings are
preceded by a minus (-) sign.
2. Total Reading Count. The size parameter of the CONFigure command
specifies the total number of readings (pre- and post-arm).
SENS1:SWE:OFFS:POIN specifies the number of pre-arm readings. The
number of post-arm readings in this program is then (200) - 100 = 100. The
total reading count can be changed without re-sending the CONFigure
command by using the TRIGger:STARt:COUNt command or
SENSe:SWEep:POINts command.
3. Pre-arm Readings. Pre-arm readings start when the digitizer receives the
INITiate[:IMMediate] command. Pre-arm readings continue until an arm is
received. Arms are ignored until the pre-arm reading count is reached. If the
pre-arm count is exceeded before the arm occurs, the last
SENSe:SWEep:OFFSet:POINts number of readings taken are stored in
memory.
Chapter 2 Usin
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the Di
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itizer 53