Setting Input Threshold Levels

The threshold levels for each channel can be set independently. A six pin plug with a two pin shorting jack is provided for each channel. The channel can be identified from the silk-screen on the board. Each jumper is labeled JXCC, where J indicates jumper, X is a number that can be ignored and CC indicates channel number. The default factory setting is for 5 volts. Pin 1 can be identified by the square pad on the bottom of the board.

Ch 0

Ch 1

Ch 2

Ch 3

Ch 5

Ch 6

Ch 8

12 Volt

24 Volt

48 Volt

.

5 Volt Settings

(Factory Default)

 

 

PET Time

Ch 57

Ch 59

Jumpers

JM202

 

 

Ch 63

Ch 61 Ch 62

JM203

Ch 60

 

.

Figure 1-6. Input Threshold Level Jumpers and Watchdog Reset Time Jumpers

Setting the Reset

Time on the

Watchdog Timer

There are 2 jumpers located on the PC board used to control the reset time of the Watchdog Timer (see Figure 1-6). The reset time is the maximum allowed time between accesses to keep the Watchdog from asserting SYSRESET. The Watchdog timer is reset by reading the Watchdog Control/Status register; use the DIAG:SYSR:STAT? command (see Chapter 3).

The following table shows the effect of the jumpers on the reset time. An X means that the jumper is in place and O indicates the jumper is removed. The factory default setting is 1.2 second.

Jumper

 

Reset Time

 

 

 

 

 

 

 

600 ms

150 ms

1.2 sec

Not Allowed

 

 

 

 

 

JM202

O

X

O

X

 

 

 

 

 

JM203

O

O

X

X

 

 

 

 

 

Installing and Configuring the HP E1459A 21