HP E4418B, Руководство по программированию

Страница: 78 / 481

prog.book : chapter1.fm 54 Mon Feb 15 09:24:37 1999
Power Meter Remote Operation
Setting Measurement Limits
1-54 HP E4418B/E4419B Programming Guide
Figure 1-6: Limits Checking Results
In this application a swept frequency signal is applied to the input of the
Device Under Test. The power meter measures the output power. The
limits have been set at +4 dBm and +10 dBm. A fail occurs each time the
output power is outside these limits. Use the
SENSe
subsystem to
configure the power meter for limits checking. The following example
program, in HP Basic, shows how to set the limits to +4 dBm and
+10 dBm.
10 !Create I/O path name
20 ASSIGN @Power to 713
30 !Clear the Power Meter’s Interface
40 CLEAR @Power
50 !Set the Power Meter to a known state
60 OUTPUT @Power;“*RST”
70 !Set the measurement units to dBm
80 OUTPUT @Power;“UNIT:POWer DBM”
90 !Set the upper limit to 10 dBm
100 OUTPUT @Power;“SENSe:LIMit:UPPer 10”
110 !Set the lower limit to 4 dBm
120 OUTPUT @Power;“SENSe:LIMit:LOWer 4”
130 !Switch the limit checking on
140 OUTPUT @Power;“SENSe:LIMit:STATe ON”
150 !Check the limits
160 OUTPUT @Power;“SENSe:LIMit:UPPer?”
170 ENTER @Power;A
180 OUTPUT @Power;“SENSe:LIMit:LOWer?”
+4 dBm
+10 dBm
Amplitude
Frequency
o
o
o
o
o
o
o
Fail
Fail