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Current Clamp readings.

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Current Clamp readings.

Postby narmour » Tue Nov 02, 2004 3:40 am

We have been using a current clamp to measure the current delivered from a current source. Our setup is your 60Amp current clamp connected to the ADC212 oscilloscope. The problem is the readings from the current clamp. Over a 72hr monitoring period, the read current decays approximately 0.8amps in a roughly linear fashion. The current from the source has been verified at a steady 13.6Amps, while the current clamp reading varies. Any help with this would be much appreciated, also what are the tolerances on the readings from the current clamp?

Thank You
narmour
 

Postby markspencer » Tue Nov 02, 2004 11:26 am

Hi,

I am sorry to hear that you are experiencing this problem. What voltage to range are you using it on and is it DC or AC.

The tolerances are as follows:

DCA range: 1mV/10mA
±(1.5% ±5mA) 10mA ~ 20A

DCA range: 1mV/100mA
±(2% ±20mA) 100mA ~ 40A
±(4% ±0.3mA) 40mA ~ 60A

ACA range: 1mV/10mA
±(2% ±5mA) 10mA ~ 10A (40Hz - 2kHz)
±(4% ±30mA) 10mA ~ 10A (2kHz - 10kHz)
±(6% ±30mA) 10mA ~ 10A (10kHz - 20kHz)
±(8% ±30mA) 10mA ~ 15A (40Hz - 20kHz)

ACA range: 1mV/100mA
±(2% ±30mA) 100mA ~ 40A (40Hz - 1kHz)
±(4% ±30mA) 100mA ~ 40A (1kHz - 2kHz)
±(6% ±30mA) 100mA ~ 40A (3kHz - 5kHz)
±(8% ±0.3mA) 40mA ~ 60A (40Hz - 5kHz)

The CA-60 Current clamp is also battery operated, it is possible that the signal may decay as the battery is used.

Best regards,
Regards,

Mark Spencer
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Voltage Range

Postby narmour » Tue Nov 02, 2004 8:04 pm

The voltage range is 2V DC. To alleviate the battery problem we have switched to a 9V DC transformer replacing the battery. It seems the base line is moving. We zero the current clamp at the beginning of a recording run, but by the end it has built up a relatively large, 1.4A, negative reading.
narmour
 

TA009

Postby narmour » Tue Nov 02, 2004 8:10 pm

Just to make sure, our current clamp part number is TA009.
narmour
 

Postby markspencer » Fri Nov 05, 2004 8:31 am

Hi,

Thank you for the extra information, I will try to replicate this by repeating what you have said and let you know the results ASAP. Unfortunately, it will take a while, as I want to test it for the period you are using yours for.

The voltage range you have specified is the one on being used on the ADC-212, but which Voltage to Amp are you using.

Best regards,
Regards,

Mark Spencer
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Postby narmour » Thu Nov 11, 2004 10:42 pm

We are using the 10mA/mV setting
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