Keysight Technologies 3458A Guide D'utilisation page 170

4 Making Measurements
Reading complete
When specified, the reading complete event (RCOMP event) produces a 1 µs
pulse following each reading for any measurement function. For sampled AC
voltage measurements (SETACV SYNC or RNDM) a pulse is output after each
computed reading, not after each sample in the measurement process. This event
can be used to synchronize an external scanner to the multimeter when making
one reading per scanner channel.
The following program uses the RCOMP event to synchronize the multimeter to a
scanner (the example uses a 3235 Switch/Test Unit with a scanning module in
slot 200). Measurement connections are shown in
programmed to output a low-going pulse after each channel closure (line 60). This
pulse is connected to the multimeter's Ext Trig connector and triggers each
reading. After each reading, the multimeter's EXTOUT signal causes the scanner
to advance to the next channel. The channel closure generates a signal which in
turn triggers the next reading. This sequence repeats until all 6 channels have
been scanned. Readings are stored in the multimeter's reading memory.
10 OUTPUT 722;"PRESET NORM"!DCV,NRDGS,1,AUTO, TARM AUTO, TRIG SYN
20 OUTPUT 722;"MEM FIFO"!ENABLE READING MEMORY, FIFO MODE
30 OUTPUT 722;"TRIG EXT"!TRIGGER EVENT = EXTERNAL
40 OUTPUT 722;"EXTOUT RCOMP,NEG" !READING COMPLETE EXTOUT, LOW-GOING
TTL
45!CONFIGURE EXTERNAL SCANNER
50 OUTPUT 709;"SADV EXTIN"!ADVANCE SCANNER ON MULTIMETER'S EXTOUT
SIGNAL
60 OUTPUT 709;"CHCLOSED EXT"!OUTPUT LOW-GOING PULSE AFTER EACH CLOSURE
70 OUTPUT 709;"SCAN 201- 206"!SCAN CHANNELS 01- 06 ON SCANNER IN SLOT
200
75 !AND ADVANCE TO CHANNEL 01, STARTING THE SCAN
80 END
170
Figure 4-6. The scanner is
Keysight 3458A User's Guide