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E3633A power supply and analog milliammeter current reading comparison

Question asked by ditch08 on Feb 17, 2014
Latest reply on Mar 4, 2014 by ditch08

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Good day to all,

I have this E3633A programmable ps model i am using to measure the current in my servo motor. I have a program with scpi commands to fetch idle and running current readings from the power supply. I made comparisons with the pps current reading with the analog milliammeter and i want to know why do they differ in detecting the max current? I read about 300+ milliamps with the pps when the shunt of the analog milliammeter only reach about 180milliamps. I have a servo connected to the pps in series with the analog milliammeter so that i can compare the readings at the same time when i command the servo to move to a certain angle. Why is this so? My running current reading for the servo motor is important that my reading with the analog milliammeter complies with the specs of the servo motor and the pps don't. Do i need to compute the pps current readings to get the same result as what my analog milliameter gets?. Thanks.

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MattC

Mar 4, 2014 2:03 PM

Hello,

Lets see what we can do to help here.

What is the expected maximum current? It is possible that the E3633A is catching some surge current when the servo runs.

If you send a few MEAS:CURR? commands in a row what sort of responses do you get?

Can you give us some more details about the meter (like the model number)?

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ditch08 @ MattC on Mar 4, 2014 3:51 PM

Good Day Sir,

Thanks for the reply. Well, the maximum running current of the servo i have should be at 180mA at 4.8V. I am not sure about the surge current but the readings i made with the pps at running were consistent. This is the ammeter model number : ksc1303-2, i think it's a dc ammeter based on the datasheet i read about it.

So my program goes like: a servo is given a command to make angle movements each second. I monitor the current readings (idle and running) through the whole duration of the process so the command is in a row for every 20msec (that's the lowest time i assumed my program can read current from the pps since when it's lower that 20msec, a query error occurs. And i really need a very small gap between readings to graphically represent the current reading at running state of the servo which only takes about 100msec to reach a certain angle.). My Idle current readings are good but the running, i am not sure. And also, i managed to use a 34401A DMM to measure the current and adding to my confusion, the DMM dc readings is the same with the pps and the DMM ac readings were the same with the analog dc ammeter.. I don't get it! :/

Thank you for the time. :)

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MattC Mar 4, 2014 2:03 PM
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Hello,

Lets see what we can do to help here.

What is the expected maximum current? It is possible that the E3633A is catching some surge current when the servo runs.

If you send a few MEAS:CURR? commands in a row what sort of responses do you get?

Can you give us some more details about the meter (like the model number)?
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- ditch08 @ MattC on Mar 4, 2014 3:51 PM
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  Good Day Sir,
  
  Thanks for the reply. Well, the maximum running current of the servo i have should be at 180mA at 4.8V. I am not sure about the surge current but the readings i made with the pps at running were consistent. This is the ammeter model number : ksc1303-2, i think it's a dc ammeter based on the datasheet i read about it.
  
  So my program goes like: a servo is given a command to make angle movements each second. I monitor the current readings (idle and running) through the whole duration of the process so the command is in a row for every 20msec (that's the lowest time i assumed my program can read current from the pps since when it's lower that 20msec, a query error occurs. And i really need a very small gap between readings to graphically represent the current reading at running state of the servo which only takes about 100msec to reach a certain angle.). My Idle current readings are good but the running, i am not sure. And also, i managed to use a 34401A DMM to measure the current and adding to my confusion, the DMM dc readings is the same with the pps and the DMM ac readings were the same with the analog dc ammeter.. I don't get it! :/
  
  Thank you for the time. :)
  Like • Show 0 Likes0
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E3633A power supply and analog milliammeter current reading comparison

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