SR3/SRP3 FAQ

Can I use Fluke or any other current probes with your logger?

No. Only the current probes that ACR sells are compatible with SR3 or SRP3 loggers.

What is the diameter and size of the A60FL and A70FL probes?

A60FL: The internal diameter of the clamp is 2.54 cm (1") and the clamp mouth can open to 2.62 cm (1.1).

A70FL: The internal diameter of the clamp is 5.08 cm (2") and the clamp mouth can open to 5.23 cm (2.06").

What is the cable length of the probes and how much can they be extended?

These probes are manufactured in five-foot lengths of two 18-gauge stranded copper conductors. This probe can be extended up to 750 feet with  the specified conductor. It is best to use a shielded conductor, to help eliminate the adverse effect of electrical noise.

Can I record current readings below 1 Amp with your probe?

Yes. You need to use a Line Splitter A-47L in addition to the A60FL probe. The Amprobe A47L energizer multiplies the signal to the logger by ten times over a range of 0.1 to 15A.

How many current probes can be connected to your logger?

Three probes to SR3 loggers and 4 to SRP3 loggers.

What is the fourth AC current channel on the SRP3 logger used for?

The fourth AC current channel has been added to allow users to record neutral currents on 3-phase power systems.

What is the accuracy of these loggers?

On the current channels, the accuracy of the system is +/- 4% of full scale for SmartReader 3 and +/-3.5% of full scale for SmartReader Plus 3 (above 10% of the range).  The current probes supplied from Amprobe (A60FL, A70FL,) are accurate to +/-3% of F.S.  The remaining 1%  or 0.5% comes from resolution effects and logger circuitry.  +/-3.5% of the full scale means that if the switch on the probe is set to 100 amps and a customer has a circuit with 25 amps flowing, the logger could record any value from 21.5 to 28.5 amps.  Note that below 10% of the measuring range the current probes are not considered accurate.

On the 0-5Volts voltage channels of the SRP3 the accuracy is ±0.5% of F.S. In other words, the accuracy is ±25mV.

Is there any restriction on the transducer if we use our own voltage transducers with output of 0-5 Volts DC?

The use of a single power supply, or isolated output is recommended to prevent ground loops.

On the voltage transducer of Rochester Scientific, there is a resistor. Should it be removed or not? What is the function of this resistor?

The function of this resistor is to convert the 0-1 mA output of the transducer to 0-5 VDC (that should be used with SRP3 loggers). Therefore, you should not remove the resistor.

The nominal voltage of the three-phase Rochester Scientific voltage transducer is 480 Volts, which is good for USA. Do you have any suitable voltage transducers to use in Canada?

No.

Do you have any AC Voltage Transducers?

We stock two different models: a 480 volt, 3-phase, 60Hz transducer and a 120 volt, single phase, 60Hz transducer. These transducers have a 0-5Vdc output proportional to the input. The input ranges are 0-600Vac for the 480V transducer and 0-150Vac for the 120V transducers. These transducers are designed for use with our SRP-003 Current and Voltage logger.  Please note that due to the lower input impedance of our SR-007 logger, these transducers should not be used with this logger. The SRP-003 loggers will work just fine as they have a much higher input impedance.