Spikes on Voltage and CTs, but not Pulses or Temp Sensors
Posted: Fri Oct 25, 2019 7:43 am
Hello,
I've noticed some very odd behavior recently. I occasionally encounter periods of time where the voltage and CT channels all spike erratically.
I first started noticing this about a month ago when I set up a few alerts in the DashBox. We had a brownout one day, and I decided to create a voltage level alert to issue an email when the PT voltage drops below 115v or exceeds 130v. Typically it is around 124v in my home.
I've done a little analysis, and see that all channels spike, but not in unison. It appears to be more of a "period of disturbance" kind of thing, but I can't easily correlate the spikes with each other or pinpoint them to a single "event" causing the behavior. Also, it's only the PT and CT channels spiking - the pulse inputs and temperature sensor inputs are stable during this time.
I've attached an example from today. I received 20 email alerts from the DB when I woke up today. Some days I don't get any spikes at all.
In my attached .png, you'll see 3 signals: voltage, garbage disposal (it's the only thing on the circuit breaker, and it was never turned on during this time sample) & a radon fan (the only device on this circuit breaker is an always-on AC motor). All three of these signals should've been stable, but as you can see, they jump around quite a bit. Often times in unison, but not always.
Anyone else have this problem? Any ideas?
My setup: GEM & DashBox from ~May 2013. Both powered off a UPS, and both connected via ethernet to a gigabit switch. The two communicate using the STS cable. Pulse inputs from gas & water meter sensors go to an arduino for manipulation before connecting to the pulse inputs on the GEM.
If it were a bad PT, I'd expect all 32 CTs to spike in unison. That's not happening.
If there was external interference or a bad power supply, I'd expect to see spikes on the pulse & temperature channels as well as the PTs & CTs. That's not happening either.
As I mentioned, this has been occurring off and on for about a month now.
I appreciate your help!
-Pete
I've noticed some very odd behavior recently. I occasionally encounter periods of time where the voltage and CT channels all spike erratically.
I first started noticing this about a month ago when I set up a few alerts in the DashBox. We had a brownout one day, and I decided to create a voltage level alert to issue an email when the PT voltage drops below 115v or exceeds 130v. Typically it is around 124v in my home.
I've done a little analysis, and see that all channels spike, but not in unison. It appears to be more of a "period of disturbance" kind of thing, but I can't easily correlate the spikes with each other or pinpoint them to a single "event" causing the behavior. Also, it's only the PT and CT channels spiking - the pulse inputs and temperature sensor inputs are stable during this time.
I've attached an example from today. I received 20 email alerts from the DB when I woke up today. Some days I don't get any spikes at all.
In my attached .png, you'll see 3 signals: voltage, garbage disposal (it's the only thing on the circuit breaker, and it was never turned on during this time sample) & a radon fan (the only device on this circuit breaker is an always-on AC motor). All three of these signals should've been stable, but as you can see, they jump around quite a bit. Often times in unison, but not always.
Anyone else have this problem? Any ideas?
My setup: GEM & DashBox from ~May 2013. Both powered off a UPS, and both connected via ethernet to a gigabit switch. The two communicate using the STS cable. Pulse inputs from gas & water meter sensors go to an arduino for manipulation before connecting to the pulse inputs on the GEM.
If it were a bad PT, I'd expect all 32 CTs to spike in unison. That's not happening.
If there was external interference or a bad power supply, I'd expect to see spikes on the pulse & temperature channels as well as the PTs & CTs. That's not happening either.
As I mentioned, this has been occurring off and on for about a month now.
I appreciate your help!
-Pete