71
function is (ON) the TEST switch on the front panel will be disabled to prevent a test
from being activated through this switch. For safety, the front panel RESET switch
remains active even when a remote reset switch is connected so that high voltage can
be shut down from either location.
The Remote File Select function gives the user the capability to quickly change
parameters and initiate a test remotely. Ten pre-programmed test files can be
accessed by connecting pins 1,6,8, and 9 to the common pin 7, in different
combinations. The memory select bits should be set simultaneously and remain set
for a minimum of 20ms to guarantee that the correct memory will be selected.
However, the memory select bits may be set in sequential manner, provided that the
time delay between each bit is less than 4ms. When the desired bit pattern has been
established it should remain set for a minimum of 20ms to guarantee that the correct
memory will be selected. The
Remote File Select Truth Table
(binary) shows the
different combinations of momentary switch (relay) closures, and which memory
programs that will be selected as the result. It may be necessary to "OR" the
momentary switches (relay contacts) to prevent incorrect program selection due to
timing errors.
REMOTE FILE SELECT TRUTH TABLE
BIT 4
BIT 3
BIT 2
BIT 1
FILE #
0
0
0
1
01
0
0
1
0
02
0
0
1
1
03
0
1
0
0
04
0
1
0
1
05
0
1
1
0
06
0
1
1
1
07
1
0
0
0
08
1
0
0
1
09
1
0
1
0
10
1= Momentary Contact closure between BIT and COMMON
0= No Contact closure between BIT and COMMON
ACTIVATING MEMORY PROGRAM FUNCTIONS THROUGH
THE REMOTE CONNECTOR, SELECTS THE PROGRAM
AND STARTS THE TEST WHICH IS PREPROGRAMMED
INTO THAT MEMORY.
DO NOT CONNECT VOLTAGE OR CURRENT TO THE
SIGNAL INPUTS, THIS COULD RESULT IN DAMAGE TO
THE CONTROL CIRCUITRY.
6.3. Remote Interlock
The 620L is equipped with a Remote Interlock feature. Remote Interlock utilizes a set
of closed contacts to enable the instrument’s output. If the Remote Interlock contacts
are open the output of the instrument will be disabled. Remote Interlock could also be
Summary of Contents for 620L
Page 99: ...93 ...
