Pacific Power Source UPC-32, Руководство по эксплуатации

Страница: 104 / 128

SECTION 5 REMOTE OPERATION
94
5.7.6 EXAMPLE OF VOLTAGE and CURRENT MEASUREMENT QUERY
How to query the UPC for three phase RMS volts (Line to Neutral) and RMS current metered values.
LINE to LINE volts, KVA, KW, Power Factor, CURRENT Crest Factor, and Peak Current may also be
queried in the same way.
See the :FETCH command and example for obtaining metered waveform data.
Step A. Address the UPC as a listener
Step B. Select Voltages A,B,C and Load Current A,B,C for AC-RMS
query by sending the following command
:MEAS:VOLT1;VOLT2;VOLT3;CURR1;CURR2;CURR3? <eos>
NOTE: <eos> is a LINE FEED (0Ahex, 10dec)
All parameters will be measured simultaneously upon receipt of the :MEAS: command. This may take
several hundred milliseconds depending upon Frequency and other factors. The values are not stored in the
UPC and another :MEAS: command will re-measure the values, further delaying response
Step C. Address the UPC as a talker to read back a query response
string, similar to the following example, representing the three
voltages and currents
120.2,120.3,121.0,3.2,2.9,3.0<eos>
Step D. Un-address UPC
5.7.7 EXAMPLE OF VOLTAGE and CURRENT WAVEFORM QUERY
This is an example of how to query the UPC for metered waveform values for phase A voltage and current.
Step A. Address the UPC as a listener
Step B. Select Voltage A or Load Current A for waveform query by
sending the following command
:FETCh:VOLTage1? <eos>
:FETCh:CURRent1? <eos>
NOTE: <eos> is a LINE FEED (0Ahex, 10dec)
NOTE: This command should immediately follow a
:MEASure command in one Program Message to obtain
waveform data corresponding with the values retrieved by
the :MEASure command (example shown below)
NOTE: All parameters will be measured simultaneously
upon receipt of the :FETCH? command. This may take
several hundred milliseconds depending upon Frequency
and other factors. The values are not stored in the UPC
and another :FETCH? command will re-measure the values
Step C. Address the UPC as a talker
The UPC returns a string representing the last metered data
waveform. Each waveform consists of 512, NR2 type numbers
separated by commas. Each waveform is terminated by a semi-
colon
Step D. Un-address UPC
An example command (substitute for step B above) for obtaining simultaneous RMS voltage and current
values and waveforms for PHASE A is as follows.
:MEASure:VOLTage1?;CURRent1?;:FETCh:VOLTage1?;CURRent1? <eos>