Q: Can I use Fluke or any other current probes with your logger?
A: No. Only the current probes that ACR sells are compatible with SR3 or SRP3 loggers.
Q: What is the diameter and size of the A60FL and A70FL probes?
A: 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").
Q: What is the cable length of the probes and how much can they be extended?
A: 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.
Q: Can I record current readings below 1 Amp with your probe?
A: 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.
Q: How many current probes can be connected to your logger?
A: Three probes to SR3 loggers and 4 to SRP3 loggers.
Q: What is the fourth AC current channel on the SRP3 logger used for?
A: The fourth AC current channel has been added to allow users to record neutral currents on 3-phase power systems.
Q: What is the accuracy of these loggers?
A: 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.
Q: Is there any restriction on the transducer if we use our own voltage transducers with output of 0-5 Volts DC?
A: The use of a single power supply, or isolated output is recommended to prevent ground loops.
Q: On the voltage transducer of Rochester Scientific, there is a resistor. Should it be removed or not? What is the function of this resistor?
A: 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.
Q: 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?
Q: Do you have any AC Voltage Transducers?
A: 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.