Set an AD marker's mode, trace, reference marker (delta mode) and/or position, then return its new state. AD module must be active. Commands apply in the order mode, trace, reference, x. AD has six markers per demod type (not SA's ten) and AD-specific traces (rf_spectrum, demod, demod_average, demod_max, demod_min, af_spectrum); x's unit is Hz for the spectrum traces and seconds for the demodulation-waveform traces. A position set on a marker that is off has no effect: set mode normal (or use ad_marker_search) first. Live-verified (2026-11-12) against a real signal.

Turn every AD marker off (:CALCulate:AM|FM:MARKer:AOFF for the current demod type) and confirm it by reading each of the six markers' mode. AD module must be active. Live-verified (2026-11-12).

Move an AD marker with a search and return its new state. AD module must be active. Actions: peak (highest), next_peak, next_left / next_right (next peak left/right of the marker), minimum, peak_to_peak (the marker becomes a delta marker). A search turns a marker that is off on. Live-verified (2026-11-12): peak search found a real external signal exactly.

Enter a measurement (channel_power, time_power, obw, acpr, toi, cn or harmonics) and set its parameters; the instrument stays in the measurement until exit_measurement. preset=true (default) is :CONFigure:, false is :CONFigure::NDEFault. Either way the instrument changes the span, RBW and sweep time (for example span 3 MHz); when entered from spectrum analyzer mode the previous frequency, bandwidth and sweep settings are saved and exit_measurement puts them back, and so is the tracking generator output (entering a measurement switches it off). While a measurement is active most spectrum analyzer queries (detector, trace type) get no reply and the tracking generator cannot be changed.

Connect to a UNI-T UTS series spectrum analyzer over auto (default: VXI-11 when the instrument offers it, else raw SCPI/TCP), VXI-11 or raw SCPI/TCP. Returns the instrument identification and the transport in use. Use host "auto" (or UTS_IP=auto) to find the analyzer on the local network when exactly one answers. Using the analyzer puts it in remote mode and locks its front panel until Esc is pressed on the analyzer.

Delete the points of one EMI limit line (line) or of all EMI limit lines (all: true). EMI module must be active (select_instrument_module). Type, trace and margin settings are left as they are. The result confirms the line is empty (for all, line 1 is checked); the analyzer finishes a delete a moment after it is sent, so the tool waits for it.

Delete the points of one limit line (line) or of all limit lines (all: true). Type, trace and margin settings are left as they are. The result confirms the line is empty (for all, line 1 is checked); the analyzer finishes a delete a moment after it is sent, so the tool waits for it.

Disconnect from the spectrum analyzer (the instrument named by name, default: the default one). The name stays registered so it can be connected again.

Find UNI-T / VXI-11 spectrum analyzers on the local network without knowing their IP address: broadcasts a portmapper query on each local IPv4 interface and identifies every responder with *IDN? (read-only; the serial number is not shown). Returns host, model, firmware and whether VXI-11 and raw port 5025 answer.

Turn every EMI marker off (:CALCulate:FSCan:MARKer:AOFF) and confirm it by reading each marker's mode.

Move an EMI marker with a peak search and return its new frequency and level. Actions: peak (highest), next (next highest), left / right (next peak left or right of the marker), minimum. A search turns a marker that is off on. Peaks must satisfy the peak criteria (get_emi_peak_criteria).

Start an EMI scan sequence and wait for it, with a time limit. Sends :INITiate2:CONTinuous OFF first (cannot read its prior state first: :INITiate2:CONTinuous? gets no reply in EMI, live-verified), then either :INITiate:FSCan:CLEar:IMMediate (clear_list true: clears the signal list and starts) or :INITiate:IMMediate. There is no documented 'finished' query; completion is inferred from the instrument answering again, since a scan-only sequence was live-verified to leave it silent to everything (including the error queue) for 25 s or more while running, then stop by itself. Reading the resulting signal list is not possible through documented commands (use emi_signal_list actions or the screenshot tool over VXI-11).

Act on the EMI module's signal table (peak table): add the current marker's frequency or measurement to the list, replace or append a row from a meter reading, delete or mark/unmark a signal, set which meter a marker couples to, or zoom the list view. The manual documents NO command to read the table's contents and none of these actions has a read-back, so the result only confirms the command was accepted (no instrument error); to see the actual list, use the screenshot tool over VXI-11.

Stop a running EMI scan sequence (:INITiate:STOP). Live-verified 2026-11-12: accepted without an instrument error in EMI mode (unlike SA, where this command gives -113). No independent confirmation that it actually halted anything was taken (no documented read-back); the result only reports whether the instrument raised an error.

Switch to the analog demodulation (AD) module and read it back. From spectrum analyzer mode, saves the frequency, bandwidth, sweep time and continuous-sweep settings first, for exit_analog_demod to restore; re-entering AD while already there keeps whatever was saved the first time. Warns (not an error) if the module did not change: on this firmware an unlicensed module is refused silently with no SCPI error, which this tool cannot distinguish from a link glitch. Leaves the instrument in AD on purpose; call exit_analog_demod when done. Does not select or preset an AM/FM demodulation type.

Leave the AD module and return to spectrum analyzer mode (:INSTrument:SELect SA). Unless restore_settings=false, the frequency, bandwidth, sweep time and continuous-sweep settings saved by enter_analog_demod are put back and verified by read-back (the same resend-once-then-fail pattern exit_measurement uses). Always sends the switch, even if this server never called enter_analog_demod (e.g. after select_instrument_module); a clear warning says so when there is nothing saved to restore, rather than guessing at settings this server never saw.

Leave the measurement and return to spectrum analyzer mode (:CONFigure:SANalyzer). The measurement preset leaves the span, RBW and sweep time changed, so unless restore_settings=false the frequency, bandwidth, sweep time and continuous-sweep settings saved by configure_measurement are put back and verified, and so is the tracking generator output, level and offset when it was on (a measurement entered elsewhere has nothing saved: a warning says so). Does nothing when already in spectrum analyzer mode.

Get the acquisition mode: continuous (true) or single sweep (false), plus the sweep time (s) and its auto flag. Note: over the raw transport the instrument ignores all commands while a single sweep is running; over VXI-11 it queues them.

Read one AD marker: mode (off, normal, delta, fixed), trace, and its position (x) and value (y) together, with their units (which depend on the trace and current demod type). AD module must be active. A delta marker's x/y are relative to its reference marker. An off marker has x and y null. Live-verified (2026-11-12).

Get a read-only snapshot of the AD (analog demodulation) module's frequency, bandwidth and demod-timing settings: current demodulation type (AM/FM, via :CONFigure?), center frequency and step, RF span and resolution bandwidth, demodulation bandwidth, AF spectrum start/stop and bandwidth, demod window sweep time, demod time and averaging, and input impedance. AD module must be active (enter_analog_demod/select_instrument_module). Filters, audio and display/marker settings are not included here (separate tool groups). A silent or malformed reply to any query is an error naming that command; no partial snapshot is ever returned. :CONFigure? and most of these getters are not yet live-verified on this firmware (docs/verified-hardware.md); treat results as plausible, not confirmed.

Get the analyzer's amplitude settings: reference level (in the current power unit), power unit, scale per division (dB), Y scale type, reference level offset (dB), input attenuation (dB) and whether it is automatic, preamp state and input impedance (ohms).

Get resolution and video bandwidth (Hz) with their auto flags, the VBW/RBW ratio and the filter shape (gaussian or flattop).

Get the AD (analog demodulation) module's numeric result window — center frequency, carrier power, carrier frequency error, modulation rate, SINAD, distortion/total Vrms, THD, and peak+/peak-/(pk-pk)/2/RMS for both the current and max-hold rows — without a screenshot. Wraps the undocumented bare :FETCh:AM?/:FETCh:FM? query (suffix 1, the default), confirmed live on this firmware (docs/verified-hardware.md). The AM/FM type is read fresh from :CONFigure? each call. AD module must be active (enter_analog_demod/select_instrument_module). This does not expose the RF spectrum trace, demodulated waveform or AF spectrum views (other FETCh suffixes); those remain screenshot-only. Units beyond what the live example confirmed (Hz, dB) are plausible, not independently verified.

Get the detector (sample, positive, negative, normal, average) and its auto flag for one trace (1-6) or all six, via :SENSe:DETector:TRACe.

Read one EMI correction (antenna/cable) factor set: whether it is enabled and its point list (frequency in Hz, gain in dB, added to the measured level at that frequency). EMI module must be active (select_instrument_module).

Read one EMI limit line: whether it is displayed, its type (upper or lower), the trace it is tested against, the margin and its on/off state, and the point list (frequency in Hz, level in dBm, connected). EMI module must be active (select_instrument_module). The analyzer documents no pass/fail read-back, so whether a trace violates the line cannot be read; check the screenshot or compare get_trace_data with the points.

Read one EMI marker: mode (off, normal, delta, fixed), trace (1-3) and its frequency (x, Hz) and level (y, dBm by default) together. A delta marker's x and y are relative to its reference marker. An off marker has x and y null.

Read the EMI peak search criteria: threshold (dBm) and excursion (dB), each with its automatic flag. In automatic mode the instrument derives the value from the trace.

Get a read-only snapshot of the EMI module configuration: standard, scan sequence, the 10-band scan table, meter/trace detectors, trace types, search/peak settings, meter frequency and attenuation, and trigger. EMI module must be active (select_instrument_module). By default omits 'scan_table' (10 bands, by far the most expensive group); pass groups including 'scan_table' to include it. A silent or malformed reply to any query is an error naming that command; no partial snapshot is ever returned.

Read the EMI module signal list's sort type and order - the only part of the signal table the manual documents as queryable.

Get the analyzer's frequency settings: center, span, start, stop, center step (and whether it is automatic) and offset, all in Hz.

Read the marker frequency counter: whether it is on and its gate time in seconds.

Get the active measurement function module: spectrum_analyzer, emi or analog_demod. Read-only, safe in any module. An unexpected reply (not SA/EMI/AD) is an error quoting it rather than a guess.

Read one limit line: whether it is displayed, its type (upper or lower), the trace it is tested against, the margin and its on/off state, and the point list (frequency in Hz, level in dBm, connected). The analyzer documents no pass/fail read-back, so whether a trace violates the line cannot be read; check the screenshot or compare get_trace_data with the points.

Read one marker: mode (off, normal, delta, fixed), trace, and its frequency (x, Hz) and level (y, current power unit, dBm by default) together. A delta marker's x and y are relative to its reference marker (reference_marker is included). An off marker has x and y null.

Read a marker's function (off, noise, band_power, band_density) and the band span used by the band functions. The function result is the marker's level: read it with get_marker (y).

Read a marker's N-dB bandwidth measurement: whether it is on, the N value (dB below the marker) and, when on, the measured bandwidth in Hz.

Report whether the instrument is in spectrum analyzer mode, or check one measurement. The instrument has no query for the active measurement, so without 'measurement' this asks one query that only spectrum analyzer mode answers (spectrum_analyzer, or an error that a measurement is active). With 'measurement' (channel_power, time_power, obw, acpr, toi, cn or harmonics) it checks that measurement and returns its parameters; an error means it is not active. A check that gets no reply costs a few seconds while the instrument recovers.

Read the peak search criteria: threshold (dBm) and excursion (dB), each with its automatic flag. In automatic mode the instrument derives the value from the trace.

Get sweep settings: sweep time (s) with auto flag and auto rule, sweep type (sweep/fft) with auto flag, sweep points (the trace length), trigger source (immediate/video) and video trigger level (dBm).

Get the trace configuration: the selected (current) trace, and for each trace 1-6 (or only trace) its type (write, average, max_hold, min_hold), update state (true = live, false = view/hold) and display state, plus the global average count and average type. Trace math cannot be read (the instrument has no query for it).

Read the amplitude values of one trace (1-6, default the selected trace) with the computed frequency axis, the power unit, the trace type and summary statistics (min, max, mean, peak level and peak frequency). The axis is linear from :FREQuency:STARt? to :FREQuency:STOP? over :SENSe:SWEep:POINts? points (zero span has no frequency axis: a time axis from 0 to the sweep time is returned and the result says so). format is ascii (default: about 14 KB, 7 significant digits, no state change, fastest on the unit), real32 (binary, about 4 KB, the same 7 digits) or real64 (binary, about 8 KB, full double precision); for a binary format the instrument's data format is switched for the read and always put back. fresh runs one single sweep first so the data is a complete, current sweep (continuous mode is switched back on afterwards); without it the values are whatever the trace currently holds, which in continuous mode can be mid-sweep. max_points (>= 2) reduces the response by peak-preserving min/max decimation and the result says so with the original count; the statistics always use the full trace. include_axis (default true) adds the per-point axis.

Get the tracking generator (the manual's 'trace source') state: output on/off, output level in dBm, level offset in dB, reference trace, normalization on/off and its reference level in dB. While a measurement is active it is an error saying so (call exit_measurement); an error naming the query otherwise means the option is probably not installed.

Query the analyzer identification (*IDN?): manufacturer, model, serial number and firmware version.

List the instruments this server knows by name (the default one, those from UTS_INSTRUMENTS and any added with connect name=...): whether each is connected, where, over which transport, and which one is used when no name is given. Read-only; the serial number is not shown.

Turn every marker off (:CALCulate:MARKer:AOFF) and confirm it by reading each marker's mode.

Move a marker with a search and return its new frequency and level together. Actions: peak (highest), next_peak (next highest), next_left / next_right (next peak left or right of the marker), minimum, peak_to_peak (the marker becomes a delta marker showing the peak-to-peak difference). A search turns a marker that is off on. Peaks must satisfy the peak threshold and excursion (get_peak_criteria).

Use a marker's frequency or level to set an instrument parameter: center, step (center frequency step; turns automatic step off), start, stop or reference_level. The marker must be on. Returns the new value of the parameter. The instrument refuses a center that would put the span outside its range.

One-shot measurement that leaves the instrument as it found it: from spectrum analyzer mode it saves the frequency, bandwidth and sweep settings and the tracking generator output (entering a measurement switches it off), enters the measurement (channel_power, time_power, obw, acpr, toi, cn or harmonics) with the given parameters, READs the result, and ALWAYS (even on errors) exits to spectrum analyzer mode, restores the settings and the generator and verifies. With the requested measurement already active it only reads and puts any parameters you changed back. It refuses when the instrument is not in spectrum analyzer mode and the requested measurement is not the active one (use exit_measurement first). Takes the measurement's averaging time.

Read the result of the active measurement. READ (default) runs the measurement and waits for it; fetch=true returns the latest result at once. channel_power gives channel power (dBm) and density (dBm/Hz), time_power gives power (dBm), obw gives occupied bandwidth (Hz), frequency error (Hz), x dB bandwidth (Hz) and total power (dBm), acpr gives main, lower and upper channel power (dBm) and lower/upper relative power (dBc), cn gives carrier and noise power (dBm) and C/N (dB), toi gives the lower and upper third-order products and tones and the intercept, harmonics gives the fundamental, harmonics 2..n (dBc) and distortion (THD). Errors when that measurement is not active; it never changes the mode.

Restart max hold, min hold or averaging by re-sending the trace's current type (:TRACe:TYPE ). Verified on the instrument: this clears the accumulated hold/average and starts over, and so do changing the type or the update state; :INITiate:RESTart and :INITiate:IMMediate do NOT. Without trace every trace that is in average, max_hold or min_hold is restarted; write traces need no restart.

Send a raw SCPI command (no reply expected) to the analyzer. Escape hatch for commands without a dedicated tool. Commands that reset the instrument, change network settings, lock the panel or write files are refused unless confirm=true. Queries are refused; use scpi_query.

Send one raw SCPI query (it must end in '?') to the analyzer and return the reply. Escape hatch for commands without a dedicated tool. Use reply='block' for IEEE 488.2 '#' binary block replies (returned as base64). Unsupported queries get no reply from the instrument and time out.

Capture the analyzer's screen and return it as a PNG image. Needs the VXI-11 transport (over raw TCP the instrument truncates large replies at 144,800 bytes, so the tool refuses with instructions). Temporarily selects PNG as the picture format (:SYSTem:PICture:FORMat) and always restores the original format. Takes about 3 seconds.

Switch the active measurement function module (SA/EMI/AD) and read it back. Does not restore the previous module afterwards - the caller chose this switch; call it again with the module you want back when done. Warns (not an error) if the module did not change: on this firmware an unlicensed module is refused silently with no SCPI error, which this tool cannot distinguish from a link glitch. The front-panel lock is unaffected by this call beyond the usual: see docs/verified-hardware.md, 'Front-panel lock'.

Switch between continuous sweep (continuous=true, the instrument's normal state) and single sweep mode (continuous=false, :INITiate:CONTINUOUS OFF). In single mode the instrument sweeps only when start_sweep or single_sweep is used.

Set the AD (analog demodulation) module's speaker and/or system volume (PM p.158-159, p.9). AD module must be active. Turning the speaker ON, or raising the volume while it is already on, requires confirm=true (loud/unexpected tone in a shared lab, docs/research/analog-demodulation.md risk 3). By default restores the speaker and volume to what they were before this call once the requested change is confirmed by read-back; pass keep=true to leave the new state in place instead. The read path (speaker state, volume) is live-verified (2026-11-12); the speaker-on/volume-raise write path was intentionally not exercised live outside a confirmed, supervised session (the audible side effect this tool's own confirm=true gate exists for).

Configure the AD module's demodulation window sweep time, demodulation time (or automatic), and averaging state/count. AD module must be active. The AM/FM prefix is read fresh from :CONFigure? each call. Ranges come from the programming manual and are not yet live-verified. Everything requested is re-read afterwards and any instrument-adjusted value is reported in 'warnings'. Leaves the new state (nothing is restored).

Configure one AD display window's Y-axis reference level and/or per-division value, and (window 3 only) the AF spectrum's linear/log spacing. AD module must be active. The unit of reference_level/per_division depends on the window and current demod type (AM/FM, read fresh from :CONFigure? each call) — see each parameter's description. Live-verified (2026-11-12) for window 1 and window 3's spacing setter; window 2's unit and exact clamp-vs-error behavior were not separately exercised. Everything requested is re-read afterwards and any instrument-adjusted value is reported in 'warnings'. Leaves the new state.

Set the AD (analog demodulation) module's audio filters: low-pass and/or high-pass (freely combinable), or band-pass/weighting (PM p.158-160). AD module must be active. The AM/FM prefix is read fresh from :CONFigure? each call. Live-verified (2026-11-12): low_pass_filter and high_pass_filter can be set together in one call (the instrument does not turn either off for the other), but band_pass_filter is mutually exclusive with both — setting it turns off any active low-/high-pass filter and vice versa (refused locally before sending anything if requested together with either). This tool reads all three before and after and reports in 'warnings' whichever family the instrument turned off that was not explicitly requested.

Configure the AD module's center frequency, RF span, resolution bandwidth and demodulation bandwidth (DBW). AD module must be active. The AM/FM prefix is read fresh from :CONFigure? each call. Ranges come from the programming manual and are not yet live-verified: whether the instrument clamps or errors out of range is UNKNOWN. Everything requested is re-read afterwards and any instrument-adjusted value is reported in 'warnings'. Leaves the new state (nothing is restored).

Set amplitude parameters. The power unit is applied first, so reference_level is interpreted in the new unit. Manual attenuation_db turns automatic attenuation off. Out-of-range values are clamped by the instrument; the settings are re-read afterwards and anything it changed is reported in 'warnings'.

Set RBW, VBW, the VBW/RBW ratio and the filter shape. Manual values turn the matching auto flag off. The instrument snaps/clamps values and couples RBW, VBW and sweep time to the span and auto flags, so everything is re-read afterwards and any change is reported in 'warnings'.

Set the detector of one trace (1-6): sample, positive, negative, normal or average (turns that trace's automatic detector off), or switch automatic selection on/off.

Edit an EMI correction (antenna/cable) factor set. EMI module must be active (select_instrument_module). Give slot plus any of: points (replaces the whole point list; 1 to 10 points in ascending frequency order, each with frequency_hz and gain_db), enabled (on/off), or delete (clears this slot's points; not combined with points). Or give all_off (turns every slot off) or delete_all (clears every slot's points) alone, without slot. The slot (or slot 1, for all_off/delete_all) is re-read afterwards; anything the instrument did not take is reported in 'warnings'.

Create or edit an EMI limit line. EMI module must be active (select_instrument_module). Give any of: displayed, type (upper/lower), trace, margin_db and margin_enabled, points (replaces the whole point list; 1 to 12 points in ascending frequency order, equal frequencies make a vertical step, each with frequency_hz, amplitude_dbm and optional connected), copy_from (copy another line's points into this one) or build_from_trace (build points from a trace's current data). copy_from/build_from_trace are sent first, then the other settings. The line is re-read afterwards; anything the instrument did not take is reported in 'warnings'.

Set an EMI marker's mode, trace, reference marker (delta mode) and/or frequency position. Commands are applied in the order mode, trace, reference, frequency; the marker is re-read afterwards and anything the instrument did not take is reported in 'warnings'. A position set on a marker that is off has no effect: set mode normal (or use emi_marker_search, which turns the marker on) first.

Configure the EMI module's measurement: standard (none/cispr), sweep sequence and re-measure mode, trace/meter/final detectors, meter dwell time, averaging, and search mode/counts. EMI module must be active (select_instrument_module). At most two of quasi_peak/average_continuous/average may be selected together per detector group (the manual documents this as mutually exclusive). Everything requested is re-read afterwards and any instrument-adjusted value is reported in 'warnings'. Leaves the new state (nothing is restored).

Set the EMI peak search criteria. Giving threshold_dbm or excursion_db turns that criterion's automatic mode off; threshold_auto / excursion_auto true switches it back to automatic. Values the instrument changed are reported in 'warnings'.

Edit the EMI module's 10-band scan table: per band, enabled, start_hz, stop_hz, rbw_hz/rbw_auto, time_s/time_auto, attenuation_db/attenuation_auto, points (11-40001) and preamp; or load a CISPR band preset (presets: band, cis: A/B/C/D/CD/E). EMI module must be active (select_instrument_module). The whole table is re-read afterwards and anything adjusted by the instrument (including the neighbor-band coupling the manual describes on overlap or crossing) is reported in 'warnings'.

Set the EMI module signal list's sort type and/or order. Read back afterward; anything the instrument did not take is a warnings entry.

Set frequency parameters (all in Hz). Give center and/or span, OR start and/or stop, OR full_span, OR zero_span; center step and offset can be combined with any of these. Frequency parameters are coupled, so the settings are re-read afterwards; values the instrument changed are reported in 'warnings'.

Turn the marker frequency counter on or off and/or set its gate time (1 us to 500 ms). Values the instrument changed are reported in 'warnings'.

Create or edit a limit line. Give any of: displayed, type (upper/lower), trace, margin_db and margin_enabled, and points (replaces the whole point list; 1 to 10 points in ascending frequency order, equal frequencies make a vertical step, each with frequency_hz, amplitude_dbm and optional connected). The line is re-read afterwards; anything the instrument did not take is reported in 'warnings'.

Set a marker's mode, trace, reference marker (delta mode) and/or position. Commands are applied in the order mode, trace, reference, x; the marker is re-read afterwards and anything the instrument did not take is reported in 'warnings'. A position set on a marker that is off has no effect: set mode normal (or use marker_search, which turns the marker on) first.

Set a marker's function: noise (noise level per Hz), band_power (power in the band), band_density (power density in the band) or off. band_span_hz sets the band width for band_power and band_density. Read the result with get_marker. Values the instrument changed are reported in 'warnings'.

Turn a marker's N-dB bandwidth measurement on or off and/or set N (dB below the marker, -140 to -0.01, e.g. -3 or -6). Returns the state including the measured bandwidth in Hz (null while off).

Set the peak search criteria. Giving threshold_dbm or excursion_db turns that criterion's automatic mode off (verified on the instrument); threshold_auto / excursion_auto true switches it back to automatic. Values the instrument changed are reported in 'warnings'.

Set sweep points, sweep time, sweep type, trigger source and video trigger level. Points, type and rule are applied before the sweep time so a manual time is not overridden by the auto coupling. Changing sweep_points changes the trace length. Out-of-range values are clamped silently by the instrument; settings are re-read afterwards and any change is reported in 'warnings'.

Set trace configuration: select the current trace, and for one trace set its type (write, average, max_hold, min_hold), update state (live or view/hold) and display state, and set the global average count (1-999) and average type. Everything is re-read afterwards and anything the instrument did not take is reported in 'warnings'. Changing a trace type or the averaging restarts that trace's hold/average. To restart hold or averaging without changing settings use restart_trace.

Set trace math for a trace (:CALCulate:MATH): result trace <- operand_a (op) operand_b. Operations: off, power_difference, power_sum, log_difference, log_offset; offset_db (-100..100) applies only to the two log operations. The instrument has no query for the math setting, so it cannot be read back (check the trace data). Enabling math switches the trace on (update and display); turning it off does not switch it off again.

Set the tracking generator (trace source): output on/off, level (dBm), level offset (dB), reference trace, normalization and its reference level. Level and offset are set before the output is switched on. The output is wired to the analyzer input on some benches, so switch it off when done: switching it off also re-asserts automatic RBW/VBW that were on (the instrument otherwise keeps a stale 300 kHz RBW). Values the instrument changed are reported in 'warnings'.

Switch to single sweep mode, run exactly one sweep and wait until it is complete, so the trace is final and can be read. Leaves the instrument in single mode; use set_acquisition continuous=true to resume normal sweeping.

Start (:INITiate:IMMediate) or restart (:INITiate:RESTart) a sweep. In single mode, wait=true (default) blocks until the sweep is complete; with wait=false call wait_for_sweep_complete next, because over the raw transport the instrument ignores every command while it sweeps (VXI-11 queues them). In continuous mode the sweep is restarted and not awaited. There is no stop/pause/resume: the instrument rejects :INITiate:STOP/PAUSe/RESume.

Wait for a sweep started with start_sweep(wait=false) to finish: over the raw transport it stays silent for the remaining sweep time (the instrument ignores input while sweeping) and then polls *OPC? until it answers; over VXI-11 it makes one blocking *OPC? read that returns when the sweep ends.