Signal Output
CRANGED versus FULL RANGE indicates the dynamic range for the data to be transmitted to other devices on the loop; dynamic range for
RANGED data is set at the HP 5890 according to the setpoint for
RANGE 2!( ) 
. Dynamic range for FULL RANGE data is limited only by the detector itself. The choice of the type of data to be transmitted is
set at the controller.
The HPIL LOOPBACK TEST may be performed any time to verify that HP 5890 INET communication is performing satisfactorily. Testing involves setting up the HP 5890 to send an INET message directly to itself by connecting its INET output to its INET input. The following procedure is used:
1.Disconnect INET cables at their respective INSTRUMENT NETWORK IN and OUT receptacles on the HP 5890 (located beneath the top right cover panel).
2.Choose either one of the cables and disconnect it at the next device on the INET loop.
3.Connect this free cable to both IN and OUT INSTRUMENT NETWORK receptacles on the HP 5890.
4. Enter the following key sequence:
CLEAR
.
7
ENTER
Upon pressing 
ENTER
, the test is performed: the HP 5890 both sends and verifies a diagnostic message to itself through the connected cable. Each press of 
ENTER
repeats the test. Each test requires about one second. Figure 5•12shows displays to be expected.
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