LISNs are used to measure the RF conducted back down the mains lead from the unit under test (UUT). Many standards refer to a LISN as an artificial mains V-network of 50ohm/50uH as specified by CISPR16. All standard Laplace LISNs are fully compliant with this requirement in all respects for the frequency band B, 150KHz to 30MHz. Each standard LISN includes a mains RF low pass filter to reject any noise already on the mains and an effective voltage transient limiter to protect any sensitive analyzer or receiver against high energy spikes. Note that these LISNs may be used on low voltage and/or DC connections provided that the current rating is not exceeded.
- The Laplace range of LISNs provides the widest range available and covers all applications from test lab to pre-compliance, commercial to military and industrial to space satellite
- All Laplace LISNs are fully compliant with the appropriate standard. Specialist models are available for automotive, military and satellite standards in addition to the standard CISPR16 range.
- All standard CISPR16 LISNs are fitted with a transient limiter, protecting the sensitive input of spectrum analyzers and receivers from the inevitable high power ‘glitches’ that are present on all mains supplies.
- A unique advantage of the Laplace range is that the Isolisn types can be used on mains supplies fitted with RCD, earth leakage detectors. Conventional CISPR16 LISNs always cause RCDs to trip.
Laplace Line Impedance Stabilization Networks
The Fully Compliant Accessory For Conducted Emissions Testing
Unique, IsoLISN, option for portable use.
Transient limiters included on Standard types.
Full range of LISN's from
10 Amp up to
Single and Three Phase
CISPR 16, MIL-STD-461E, Automotive and other special types
Switched attenuator (0, 10, 20dB) and switched 150KHz high pass filter.
Mains supply for internal pre-amplifier required.
‘S’ LISNs feature the unique IsoLISN design which complies with EN61010 and has an earth leakage current less than 5mA, avoiding the problem of RCD trips. This makes them ideal for portable applications.
Fitted with standard mains outlet. UK, US, Schuko and Australian models available.
Line selector switch fitted to all LISNs, with remote control available on all standard types.
W x H x D (mm)
212 x 132 (3u) x 315
315 x 3u x 422
483 x 6u x 422
483 x 9u x 522
500 x 180 x 90
500 x 180 x 120
600 x 380 x 350
RF Output Socket:
50 ohm, BNC
Band A - 9 KHz to 30 MHz Band B - 150KHz - 30MHz (u.o.s. above)
Insertion Loss (dB):
0 (Zero) dB, LISN16A1P, see note 1above
Front panel switch and remote control.
EUT Line Connections:
LISN16A1P, see note 4 All others: Shrouded single pole sockets: < 32A = 4mm > 32A = 6mm
Artificial Hand Output:
All CISPR16 LISNs fitted.
Single Phase: 3 Phase:
Up to 250V AC rms Up to 415V AC rms
External transient limiter for use with LISNs not fitted with internal transient limiter. Insertion loss = 0dB, Bandwidth 9KHz - 400MHzMains supply required
Power Line Interference Probe..... See separate information sheet. Complies with CISPR16. Insertion loss nominally 0dB. No restriction on EUT supply current For use in circumstances when a LISN is not appropriate (e.g. current >100A, permanent installation.....) Includes 1kV isolation, transient limiter and 30dB amplifier.
Laplace Conducted Emission Tester
Complete Portable conducted emissions tester....See separate information sheet Includes voltage probe and emissions measuring unit giving readout of frequency and dBuV Enables shop-floor and on-site measurements to be made easily and quickly. Single phase and 3 phase operation (500V AC rms, max.) Internal rechargeable batteries fitted and battery charger supplied.
Laplace Conducted Reference Source
The CRS+ is
a stable and repeatable, wideband generator covering the EMC
conducted bands A and B. It is specifically designed to check and
calibrate LISNs and associated equipment. Very quick and easy to
use, the CRS+ verifies that EUT measurements are valid and accurate.
· Accredited test houses
· Manufacturers who are self testing
· Pre-compliance testing
· Research organizations
The CRS+ simply plugs straight into the EUT outlet port on a LISN.
Switch on and scan band A and/or band B on the analyzer/receiver.
Comparison with the calibration data of the CRS will immediately
indicate the accuracy of your system. The direct output into the
LISN ensures that external noise is eliminated and no additional
cabling is required. Supplied complete with batteries and one