Stanford Research Systems SR620, Manual

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xii Abridged Command List
SR620 Universal Time Interval Counter
MODE(?) j Sets the instrument mode to 0 = time,1 = width, 2=tr/tf, 3 = freq, 4 = period, 5
= phase, 6 = count.
SIZE(?) j Sets the number of samples.
SRCE(?) j Sets the measurement source to 0 = A, 1= B, 2= REF, 3 = ratio.
STRT Same as pushing start button.
STOP Same as pushing stop button.
Data Commands
MEAS? j
Startts a measurement and returns the result when it is complete. If j=0 the
mean is returned, j=1 returns the jitter, j=2 returns the max, and j=3 the min.
XALL? Returns mean,rel,jitter,max,min of a measurement.
XAVG? Returns the mean of measurement.
XJIT? Returns the jitter of a measurement.
XMAX? Returns the max of a measurement.
XMIN? Returns the min of a measurement.
XREL(?) x Sets the value of the display rel to x.
XHST? j Returns section j of the histogram display as 4 byte binary integers.j=0 to 9.
HSPT? j Return the value of the point n on the histogram. j=1 to j = 250. Returns
9E20 if graph is blank.
SCAV? j Returns the value of point n (1 - 250) of the mean stripchart or the value of
scan point j. returns 9E20 if the stripchart is blank or the scan has not
reachedpoint j.
SCJT? j Returns the value of point n (1 - 250) of the jitter stripchart or the value of
scan point j. returns 9E20 if the stripchart is blank or the scan has not
reached point j.
BDMP j Binary dumps j points. Sample size = 1.
Scan Commands
ANMD(?) j
Sets the DAC output mode of the mean and jitter DAC's to 0 = chart/chart, 1=
DAC/chart, 2= chart/DAC,3 = DAC/DAC.
DBEG(?) j Sets the delay scan start position to 1-50000 step sizes after the external
trigger
DSEN(?) j Enables the internal delay scan . 0 = delay off, 1=delay hold, 2 = delay scan.
DSTP(?) x Sets the delay scan step size to 1,2,5 x 10
-2
,
-3
,
-4
,
-5
,
-6
. 1 x 10
–2
is the
maximum step size.
HOLD(?) x Sets the hold time between scan points from .01s to 1000 s in .01 s steps
SCAN Clears and restarts a scan.
SCEN(?) j Enables scanning. 0 = disabled,1= single scan mode 2 = repeat scan mode
SCLR Clears the scan.
SLOC? Returns the number of the last completed scan point. Returns 0 if no points
are complete.
SCPT(?) j Sets number of scan points to 2,5,10,25,50,125,250.
VBEG(?) j,x Sets the DAC output scan starting voltage. If scans are disabled or the step
size is zero the output is immediately set to the new voltage. Otherwise, the
voltage is updated at the start of the next scan.
VOUT? j Reads the current output voltage of DAC channel j.
VSTP(?) j,x Sets the DAC scan step size to x volts.
Graphics Control Commands
AUTP(?) j
Sets the autoprint mode to 0 = off or 1 = on.
AUTS Autoscales the displayed graph.
CURS (?) j Sets the cursor position to j.
DGPH(?) j Sets the displayed graph to 0 = histogram,1= mean,2 = jitter
GCLR Clears the displayed graph.