LTE DIN Rail Digital Transmitters with Ethernet Communication and Analog Outputs for Time of Periodic Event Applications

LTE Time of Periodic Events Transmitter Frequently Asked Questions

Why does resolution improve from 1 ms at the widest range down to 0.2 µs at the narrowest range, rather than staying constant across all ranges?

Documented resolution table specifically ties finer resolution to narrower measurement ranges — since the transmitter's internal count of 5.5 MHz clock pulses produces a fixed number of possible count values, spreading that same count resolution over a much wider maximum time range (199.999 s) necessarily yields coarser resolution than concentrating it over a much narrower range (0.099999 s), which is why the documented resolution figures scale together with the selected range.

Why does the finest documented resolution of 0.2 µs specifically require averaging, unlike the coarser resolution tiers?

Documented specification specifically notes "0.2 µs (after averaging)" only for the narrowest range, distinct from the other resolution tiers listed without that qualifier — this indicates that achieving the very finest resolution specifically depends on the documented multiple-integral-time-interval averaging process over the selected gate time, rather than being available from a single, unaveraged measurement the way the coarser resolution tiers are documented as being.

Does this LTE Time Interval transmitter's documented Modbus TCP-only protocol limit compatibility compared to the RS232/RS485 LT Series time interval variant?

Yes — this page documents Modbus TCP specifically as the supported Ethernet Data I/O protocol at digital address 247, while the LT Series serial variant is documented elsewhere as separately supporting Modbus RTU/ASCII and Laurel Custom ASCII; a control system needing a protocol other than Modbus TCP would need to reference the LT Series serial variant rather than this LTE Ethernet variant.

Does tying Channels A and B together for pulse width measurement affect the transmitter's documented gate-time averaging capability?

No — documented description specifically states that for pulse width measurement (A and B tied together), "readings are averaged over a user-selectable gate time," the same underlying averaging mechanism documented for the separate time-delay measurement mode; tying the channels together changes what physical quantity is being measured, not whether gate-time averaging remains available.

Can the same physical transmitter be reconfigured between measuring time delay (A to B) and pulse width (A tied to B), or does this require different hardware?

Documented description presents both as configuration modes of the same Time Interval Mode transmitter, distinguished by whether Channels A and B are wired to separate signal sources or tied together — this is consistent with a wiring and setup configuration choice on the same physical hardware, rather than requiring separate transmitter models for time delay versus pulse width measurement.

Does averaging multiple time intervals over a longer gate time reduce genuine measurement noise, or does it also risk masking real variation between individual events?

Documented description specifically frames averaging as improving resolution (particularly enabling the finest 0.2 µs tier), which is consistent with reducing the effect of random measurement noise on the reported value — however, since the reported reading represents an average across the gate time's multiple intervals rather than any single interval, genuine event-to-event variation would similarly be smoothed into that average rather than reported individually, a general characteristic of any averaging-based measurement approach.

Does the documented ±1 ppm/°C span tempco figure apply to the time-delay reading, the pulse-width reading, or both?

Documented specification lists span tempco once under the general Pulse Input section, applying to the transmitter's underlying timing measurement as a whole, rather than listing separate tempco figures for time-delay mode versus pulse-width mode — since both modes share the same documented 5.5 MHz clock-counting mechanism, the same ±1 ppm/°C span tempco figure is consistent with applying regardless of which specific timing mode is configured.

Does selecting a shorter gate time always provide a faster-updating reading, even at the cost of averaging fewer intervals?

Yes — documented specification ties output update rate directly to gate time (gate time + 30 ms + 0-2 time intervals), meaning a shorter selected gate time is consistent with a faster update rate; the documented tradeoff is that a shorter gate time also averages fewer individual time intervals together, which is the same general averaging-versus-responsiveness tradeoff documented elsewhere for gate time selection on related LTE Series transmitters.

Can Time Interval Mode on this transmitter measure a time delay between two entirely unrelated periodic signals, or must A and B originate from the same underlying event source?

Documented description specifically states the mode allows "inputs from different sources" for the A-to-B time delay measurement, without requiring A and B to originate from the same underlying physical event — this is consistent with using this transmitter to measure the timing relationship between two genuinely independent periodic signals, provided both are periodic and their relative timing relationship is what's meaningful to the specific application.

Does power consumption increase specifically when using the maximum transducer excitation output, and by how much per the documented specification?

Yes — documented specification lists power consumption as "2.5W typical at 24V, 4.0W with max excitation output," directly quantifying the additional power draw when the transducer excitation output is set to its maximum documented level, representing a genuine, specified increase tied to how much excitation current is being supplied to an external transducer.

Dedicated Timer/Counter vs. Oscilloscope Questions From the Field

What is the documented core functional difference between a frequency counter/timer instrument and an oscilloscope for periodic signal measurement?

Documented comparison specifically explains that frequency counters measure signal frequency or timing with high precision by counting cycles over a set time, making them well suited to stable, steady signals, while oscilloscopes instead display voltage changes over time as waveforms, providing visual, time-domain detail rather than the same counting-based numeric precision; documented analysis specifically notes oscilloscopes can also detect frequency, but with documented lower precision than a dedicated counter.

Does a dedicated counter/timer instrument provide amplitude information the way an oscilloscope does?

No — documented comparison specifically states frequency counters do not measure amplitude, focusing solely on counting cycles without displaying voltage levels, while oscilloscopes are documented as specifically effective at showing voltage changes over time; this reflects a genuine, documented functional tradeoff between the two instrument types rather than one being a strict superset of the other's capability.

Is there a documented practical reason a dedicated fixed-installation timing instrument is preferred over bringing in a lab oscilloscope for ongoing monitoring?

Documented analysis specifically notes frequency counters are commonly used in labs and workshops for precisely this kind of dedicated, ongoing checking task — fixing clocks and timers by measuring their signals, and testing components like oscillators and transmitters — which reflects that a purpose-built counting instrument is documented as well suited to exactly this kind of repeated, precision timing verification task that doesn't require the oscilloscope's broader waveform-visualization capability.

Does improper signal probing genuinely cause measurement errors specifically on frequency counter instruments, separate from oscilloscope probing concerns?

Yes — documented technical guidance specifically warns that improper probing affects signal integrity and can cause "double triggering," a specific documented failure mode where the measured frequency reads higher than the signal's actual frequency; documented best practice specifically recommends a defined probing scheme (such as 50Ω instrument termination with a series isolation resistor) to avoid this genuine, quantifiable measurement error.

Is there a documented specific technical method used inside digital frequency counters to convert an input signal into a countable measurement?

Yes — documented technical description specifically describes a digital gate frequency measurement method, where a preconditioned input signal is applied to one input of a digital AND gate, with the gate's output then counted over a defined time window; this documented internal mechanism is the underlying technique that allows a dedicated counter instrument to convert an analog input signal into a precise digital count.

Do oscilloscope trigger holdoff circuits address a genuinely different measurement challenge than the averaging used in a dedicated timer/counter instrument?

Yes — documented technical description specifically explains trigger holdoff circuitry as addressing the problem of stably displaying a repetitive waveform on an oscilloscope screen by preventing premature re-triggering during a defined holdoff period, a documented challenge specific to producing a stable visual display; this is a genuinely different technical problem from a dedicated timer/counter's documented gate-time averaging, which is aimed at improving numeric measurement resolution rather than visual display stability.

Does documented history show digital oscilloscopes always outperforming earlier analog oscilloscopes for every measurement task?

No — documented industry retrospective specifically identifies genuine advantages of analog oscilloscopes that took years for digital technology to match, including that analog systems don't introduce aliased information and that phosphorescent analog displays could show subtle differences in repetitive signals valued particularly by audio and video engineers; documented analysis frames the digital oscilloscope's dominance as the result of specific engineering tradeoffs being resolved over time, not an inherent, immediate universal superiority.

Is variable-time-interval triggering (rather than simple fixed-period repetition) a documented genuine challenge for standard oscilloscope trigger circuits?

Yes — documented technical description specifically identifies that conventional trigger holdoff systems function properly only when the input signal is truly repetitive with a fixed holdoff period, but become unstable when raw trigger signals arrive in groups with variable time intervals between them (such as output from a state machine); documented patented circuitry specifically addresses this using a programmable divide-by-N counter to select a consistent trigger point from within such a variable-timing pattern.