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Installing and Configuring the HP E1459A 21
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.
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.
12 Volt
24 Volt
48 Volt
5 Volt Settings
(Factory Default)
Ch 0 Ch 2
Ch 3
Ch 5
Ch 6
Ch 8
Ch 63
Ch 60
Ch 57 Ch 59
Ch 62
JM203
JM202
PET Time
Jumpers
.
Ch
1
Ch 61
.
Jumper Reset Time
600 ms 150 ms 1.2 sec Not Allowed
JM202 O X O X
JM203 O O X X