Agilent 34980A  Multifunction Switch/Measure Unit 34980-90005

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3 Features and Functions Using Alarms With the Digital Modules You can configure the instrument to generate an alarm when a specific bit pattern or bit pattern change is detected on a digital input channel or when a specific count is reached on a totalizer channel (34950A and 34952A). These channels do not have to be part of the scan list to generate an alarm. Alarms are evaluated continuously as soon as you enable them. The channel numbering scheme for the digital input and totalizer channels is shown below (s represents the slot number). Pattern comparisons always start on the lowest- numbered channel in the bank and extend to all channels involved in the channel width. Alarms are evaluated continuously on the digital modules, but alarm data is stored in reading memory only during a scan. Each time you start a new scan, the instrument clears all readings (including alarm data) stored in reading memory from the previous scan. However, alarm data stored in the alarm queue from the digital modules is not cleared. Therefore, although the contents of reading memory are always from the most recent scan, the alarm queue may contain data that occurred during previous scans or while the instrument was not scanning. Front Panel Operation: Digital Input Channel Numbering 34950A s101 through s104 s201 through s204 34952A s001 through s004 s005 Totalizer Channel Numbering s301, s302 To configure an alarm on a digital input channel, choose from the following items and then set the desired patterns for the compare data and mask. Set each bit to “0” or “1”. Alarm > COMPARE DATA > COMPARE MASK You can either specify that an alarm will occur when certain bits change or when a specific pattern is read: Alarm > COMPARE FOR > EQUAL|NOT-EQ To configure an alarm on a specific totalizer count, select: Alarm > TOTALIZER LIMIT 138 Agilent 34980A Mainframe User’s Guide
Features and Functions 3 Remote Interface Operation (Digital Input): To assign the alarm number to report any alarm conditions on the specified digital input channels, use the following command. OUTPut:ALARm[1|2|3|4]:SOURce (@) To configure alarms on the specified digital input channel, use the following commands (also see the example on the following page). CALCulate :COMPare:TYPE {EQUal|NEQual},(@) :COMPare:DATA ,(@) :COMPare:MASK ,(@) Select EQUal to generate an alarm when the data read from the port is equal to CALC:COMP:DATA after being masked by CALC:COMP:MASK. Select NEQual (not equal) to generate an alarm when the data read from the port is not equal to CALC:COMP:DATA after being masked by CALC:COMP:MASK. Use CALC:COMP:MASK to designate the “don’t care” bits. Bits that you set to “0” in the mask are ignored. To enable the specified alarm mode, send the following command. CALCulate:COMPare:STATe ON,(@) Example: Configuring an Alarm on a Digital Input The following program segment sets the digital pattern for the 34950A in slot 3 and then enables the pattern comparison mode. When the data read from the bank is equal to the comparison pattern, an alarm is generated on Alarm 2. CALC:COMP:DATA:WORD #HF6,(@3101) CALC:COMP:TYPE EQUAL,(@3101) OUTP:ALARM2:SOUR (@3101) CALC:COMP:STAT ON,(@3101) Remote Interface Operation (Totalizer): To assign the alarm number to report any alarm conditions on the specified totalizer channels, use the following command. OUTPut:ALARm[1|2|3|4]:SOURce (@) To configure an alarm on a totalizer channel, specify the desired count as the upper limit using the following command. CALCulate:LIMit:UPPer ,(@) To enable the upper limit on the specified totalizer channel, use the following command. CALCulate:LIMit:UPPer:STATe ON,(@) Set compare pattern (1111 0110) Generate alarm on match Enable alarms Enable pattern compare mode Agilent 34980A Mainframe User’s Guide 139
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Agilent 34980A  Multifunction Switch/Measure Unit *34980-90005*

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Agilent 34980A  Multifunction Switch/Measure Unit 34980-90005