start = time()
for i in xrange(repeats):
#### Need such routine to avoid timeout
### wait until it is nearly time to ask for the result
### but only when the gating time is long
if (gatetime > 2):
stoptime = start + gatetime -1
while time() < stoptime:
try:
sleep(0.1)
except KeyboardInterrupt:
out.close()
print "Interrupt by user"
sys.exit(1)
# Ask for the result, this also starts the next measurement
freq = float(counter.ask("FETCH:FREQ?"))
finish = time()
counter.write(":FREQ:EXP1 %s" %freq)
elapsed = finish - start
start = finish
# Print result to file and screen
result = array([[finish, freq]])
savetxt(out, result)
print "%g Hz (elapsed: %.3f s) " %(freq, elapsed)
out.close()
