VXI VT1538A user manual Frequency Measurement

Totalizer	Capacity	24 bits or 16,777,215
	Minimum Pulse Width	500nS
	Frequency Range	0-100 KHz

Frequency Measurement	Gate Time ( taperture )	1 mSec to 1 Second, resolution		1
				f--i--n-
	Range	1	to 100, 000
		t--a---pe-----r--t--ur-----e
	Accuracy	.01%
	Resolution (Hz)	fi n pu t
		----------------------------------------------------
		ta pe rt ure	× 4.194MHz
	Minimum Pulse Width	500 nS

Period Measurement	Gate Time ( taperture )	40 μSec to 4 Second
	Range (SENS:PER:RANGE=1)	10μSec to ta pe rtu re	(1 sec max)
	(SENS:PER:RANGE=4)	40μSec to tap ert u re	(4 sec max)
	Accuracy	.01%
	Resolution	.2384μSec
	Minimum Pulse Width	500 nSec

Time-out Mechanism Programmable 4mSec to 60Sec

(SENS:FREQ:LIM:LOW & SENS:PER:LIM:UPP)

Aperture Time

The aperture time is the time allowed to average multiple period and frequency measurements

Function	Aperture Range
Frequency	1mSec to 1 Sec
Period (2 ranges)	1mSec to 1 Sec (SENS:PER:RANGE 1)
	4mSec to 4 Sec (SENS:PER:RANGE 4)

78 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP