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Incessant relay clicking when sampling on DT85 - is this normal?

I've got a DT85 Series 2 with the latest 9.22 firmware and am configuring it with dEX-2 v2.1.25 but when I have it reading a couple of voltage channels I'm hearing internal relays clicking each time, is this normal? Although the expected values are correct, the noise is annoying. Am I missing a setting somewhere?

If its relevant, I'm making readings from pins 2 & 3 from the 4-pin connectors. Also, the internal lithium battery is dead, replacement on the way.

I've got a DT85 Series 2 with the latest 9.22 firmware and am configuring it with dEX-2 v2.1.25 but when I have it reading a couple of voltage channels I'm hearing internal relays clicking each time, is this normal? Although the expected values are correct, the noise is annoying. Am I missing a setting somewhere? If its relevant, I'm making readings from pins 2 & 3 from the 4-pin connectors. Also, the internal lithium battery is dead, replacement on the way.
edited Oct 10 '21 at 1:46 am

Hi Brian,

The clicking sound in series 4 is normal, we do replace most of the mechanical relay with a solid-state relay, but at some point in the circuit, we still retain them. The relay separates the internal ADC circuit from the terminal that you can connect the sensor.

The clicking occurs when a measurement is due because the logger itself is a multiplexing unit. The relay clicking indicates the running between channels in sequence.

Best regards,
Rudy Gunawan

Hi Brian, The clicking sound in series 4 is normal, we do replace most of the mechanical relay with a solid-state relay, but at some point in the circuit, we still retain them. The relay separates the internal ADC circuit from the terminal that you can connect the sensor. The clicking occurs when a measurement is due because the logger itself is a multiplexing unit. The relay clicking indicates the running between channels in sequence. Best regards, Rudy Gunawan
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