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18 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP
Measure Period Use [SENSe:]PERiod:MODe APERture | NPERiods,(@<ch_list>) to select
the measurement interval setting mode.
Depending on the mode selected above use
[SENSe:]PERiod:APERture <time>,(@<ch_list>) or
use [SENSe:]PERiod:NPERiods <n_periods>,(@<ch_list>) to set the
interval for measuring and averaging signal periods.
For PERiod function, the E1538 spports two distinct measurement ranges:
1. When SENS:PER:RANGE is set to 1sec, the E1538 can measure
periods from 10usec - 1sec. The value of SENS:PER:APER can range
from 10usec - 1sec.
2. When SENS:PER:RANGE is set to 4sec, the E1538 can measure
periods from 40usec - 4sec. The value of SENS:PER:APER can range
from 40usec - 4sec. See SENS:PER:RANGE command on page 61
Use [SENSe:]FUNCtion:PERiod (@<ch_list>) to configure channels to
measure signal period.
To measure the signal period at channel 45 with aperture of 01 second
*RST
TRIGGER:TIMER .2
Alg executes at .2 sec intervals
SENS:FUNC:PER (@145)
ch 45 to measure signal period
SENS:PER:RANGE 1,(@145)
set period range 10µsec - 1sec
SENS:PER:MODE APER(@145)
set meas and avg interval mode
SENS:PER:APER 1,(@145)
meas and avg sig periods for 1S
ALG:DEF ’ALG1’,’writecvt(I145,45);’
alg puts period in CVT
INIT
start algorithm execution
do loop
SENS:DATA:CVT? (@45)
get period from CVT
read value from CVT query above
end loop
Figure 11. Input Period