VXI VT1538A user manual General Specifications, Output Characteristics, Input Characteristics

Specifications

These specifications for the E1538A reflect its performance while installed on your VXI module.

General Specifications

Output Characteristics	Characteristic	Pull-Up Off	Pull-Up On (10K to Vcc)
	current source (logic 1)	0	.38mA @ 1.2V
	current sink (logic 0)	100 mA	100 mA
	Voltage (logic 1)	0	5V (no load)
	Voltage (logic 0)	0.5 Max sinking 100mA	0.5 Max sinking 100mA
		0.1 Max sinking 20mA	0.1 Max sinking 20mA

Input Characteristics	Characteristic	Pull-Up Off	Pull-Up On (10K to Vcc)
(VRS OFF for Chs0&1)	Equivalent circuit	120K conn. to 0 Volts	9.2KΩ conn. to 4.6 Volts
	Maximum input low	programmable from	programmable from
	Minimum input high	-46 to 46 Volts (±0.5V)	-46 to 46 Volts (±0.5V)

Input Isolation No Isolation Provided

Cross-Talk Between Channels

A large signal on one channel has an effect on the accuracy of frequency measured on other channels as follows:

Sine-wave interfering signal up to 70Vpp	No degradation of specification
Square-wave Interfering signal <63Vpp	No degradation of specification
Square-wave Interfering signal >63Vpp to	Minimum input amplitude changes from 15mV
70Vpp	to 18mV for frequency range of 1Hz to 10Khz
	(see Input Signal Characteristics spec.)

Maximum voltage applied to any	-48 Volts to 48 Volts
input terminal

Maximum voltage applied to any output terminal

0 - 48 Volts (outputs are diode clamped at -0.3V)

Agilent E1538A Enhanced Frequency/Totalize/PWM SCP 77