Product Manual

7526A
Users Manual
1-12
Isolated Input Display, Controls, and Terminals
Figure 1-4 shows the isolated input display, controls, and terminals.
100 V PK
MAX
HI
INPUT
LO
Switch Test
Reset
LOOP
HART
PWR
1
3
2
Press and Hold
for Switch Test
VOLTS
mA
gwp004.eps
Item Name Description
 Display
A two-line, 16-character display gives all visual user
feedback for the isolated input operations. See the
“Display Layouts” section of this chapter for layout
information, and the “Error Messages” section of this
chapter for possible error messages.
Function Keys


This key is used for multiple functions. In normal operation
it is used to move through the 50 mA, 10 V and 100 V
ranges.
If held for 3 seconds it will change the Product into or out of
switchtest mode. In switchtest recall mode it will move
through the stored switch test data.
L
When you use 24 mA mode to verify a two-wire loop
powered transmitter, disconnect it from its wires and push
L. This turns on an internal 24 V power supply in series
with the current measurement circuit. Push the key again
to turn off the 24 V supply. In all switch test modes, push
this key to start or stop a test.

When you use 50 mA mode to verify a HART configuration
device, push this key to turn on an internal 250 e resistor
in series. Push the key again to turn off the resistor. Note
that when you turn on this resistor, the maximum load-
driving functionality drops from 1000 e at 20 mA to 750 e
at 20 mA.
Figure 1-4. Isolated Input Display, Controls, and Terminals