Agilent Technologies 34937A Manual De Usuario

See the Introduction to the Plug In Modules chapter of the 34980A 
Mainframe User’s Guide

 

for detailed environmental operating conditions 

for the 34980A mainframe and its installed modules. That guidance sets 
maximum per channel current and power ratings at rated voltage for 
pollution degree 1 (dry) and pollution degree 2 (possible condensation) 
conditions, for each of the GP modules.

A temperature sensor on these modules triggers system interrupts when 
high- carry current- induced heat on the modules is excessive and sets the 
HOT annunciator on the front panel. This over- temperature situation 
generates an SRQ event when the factory- set 70

  o

C threshold is reached. It 

is up to the user to determine what, if any, action should be taken.

Reactive loads (those that include significant inductance or capacitance) 
can cause voltage spikes or current spikes during switching operations. 
The general purpose modules are designed for switching reactive loads. 
The optional 34937T and 34938T terminal blocks have solder pads for 
adding snubber circuits for the 5 A relays to reduce the reactive 
transients. See the drawings on 

 for the locations of 

snubber circuit pads and installation information about a snubber circuit. 

A hardware jumper on the 34937A and 34938A modules allows you to 
define the power- failure states for the modules’ 5 A latching relays. 
Depending on the position of the jumper, the 5 A relays will either open 
or maintain state when system power failure occurs. 

On the 34939A module, a hardware jumper allows you to define the 
power- failure state affecting all 64 of the module’s 1 A latching relays. 
Depending on the position of the jumper, these relays will either open or 
maintain state when system power failure occurs.