1. Manuals
  2. Brands
  3. NF Manuals
  4. Amplifier
  5. LI5501
  6. Instruction manual

NF LI5501 Instruction Manual

Lock-in amplifier module
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
LOCK-IN AMPLIFIER MODULE
LI5501 / LI5502
INSTRUCTION MANUAL
NF Corporation

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the LI5501 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for NF LI5501

Summary of Contents for NF LI5501

  • Page 1 LOCK-IN AMPLIFIER MODULE LI5501 / LI5502 INSTRUCTION MANUAL NF Corporation...
  • Page 3 DA00098273-003 LOCK-IN AMPLIFIER MODULE LI5501 / LI5502 INSTRUCTION MANUAL...
  • Page 4 Registered Trademarks National Instruments and LabVIEW are registered trademarks of National Instruments Corporation in the United States. Other company names and product names used in this instruction manual may be trademarks or registered trademarks of their respective companies.
  • Page 5 Preface ――― Preface ――― Thank you for purchasing the “LI5501 / LI5502 LOCK-IN AMPLIFIER MODULE”. For safe and correct use of this instrument, please read the “Safety Precautions” section that follows before attempting to use the instrument. ⚫ Marks and Symbols For safe operation by the user and to prevent damage to the instrument, please give attention to the following marks and symbols that are used in this manual.
  • Page 6 4. Basic settings This chapter describes basic settings of the “LI5501 / LI5502”. 5. Remote control This chapter describes remote control commands of the “LI5501 / LI5502”. 6. Advanced settings This chapter describes advanced settings of the “LI5501 / LI5502”.
  • Page 7 ――― Safety Precautions ――― For safe use of this product, give full attention to the following warnings and cautions. The NF Corporation shall not be held liable for damages that arise from failure to observe these warnings and cautions. ⚫ Be sure to observe the contents of instruction manual.
  • Page 8 Use of this instrument when it is wet may result in malfunction. If this instrument becomes wet, immediately unplug the power cord of the power supply and contact the NF Corporation or its authorized agent. ⚫ If lightning occurs nearby, unplug the power cord.
  • Page 9 To protect the environment, follow the guidelines described below for the disposal of this instrument. a) This instrument does not use batteries. b) Use the services of an industrial waste disposal contractor for disposal of this instrument. LI5501 / LI5502...

  • Page 10: Table Of Contents

    5.5 Error messages ....................... 5-49 6． Advanced settings..................6-1 6.1 Measurement data buffer ................... 6-2 6.2 Configuration memory ....................6-8 6.3 FAN control ........................ 6-9 7． Troubleshooting ..................7-1 7.1 Error messages ......................7-2 7.2 Abnormalities during measurement ................7-3 LI5501 / LI5502...
  • Page 11 9． Specifications ....................9-1 9.1 Input section ....................... 9-2 9.2 Output section ......................9-4 9.3 Analysis function ......................9-5 9.4 Digital data output ....................9-10 9.5 Remote control interface..................9-10 9.6 Miscellaneous specifications ................... 9-11 9.7 External dimensions ....................9-13 LI5501 / LI5502...
  • Page 12 Figures and Tables Page Figure 1-1 Basic principle of Lock-in Amplifier ..............1-4 Figure 1-2 Block diagram of the LI5501 / LI5502 ..............1-6 Figure 3-1 Top side ....................... 3-2 Figure 3-2 Rear side ......................3-3 Figure 5-1 Common command syntax ................5-10 Figure 5-2 Subsystem command syntax ................
  • Page 13 Table 5-7 Transition filter settings and the event register transitions ......... 5-45 Table 5-8 Contents of the questionable condition register ..........5-47 Table 5-9 Transition filter settings and the event register transitions ......... 5-48 Table 5-10 Error messages ....................5-49 Table 6-1 Measurement data parameters ................6-2 LI5501 / LI5502...
  • Page 14 (Blank) LI5501 / LI5502...

  • Page 15: 1． Introduction

    1． Introduction 1.1 Features ............... 1-2 1.2 Applications ............1-3 1.3 Operating principle ..........1-4 1.3.1 Basic principle of Lock-in Amplifier ......1-4 1.3.2 Block diagram ............. 1-6 LI5501 / LI5502...

  • Page 16: Features

    1.1 Features Features The “LI5501 / LI5502 LOCK-IN AMPLIFIER MODULE” is a dual-phase lock-in amplifier module with a frequency range of 10 mHz to 1 MHz. They can be widely used to measure amplitude and a phase of small AC signal buried in noise taking advantage of the following features.

  • Page 17: Applications

    It is easy to mount the instrument on equipment by using the attached metal fittings. Applications The LI5501 / LI5502 can be used in the following fields, taking advantage of its features. • Signal detection in scanning probe microscope • Thermal diffusivity measurement of thin film materials •...

  • Page 18: Operating Principle

    In short, the original signal can be measured even though the noise is greater than the signal. DC gain after the PSD are determined by the sensitivity (full- scale of signal voltage) and dynamic reserve (DR) setting. (DR value = Allowable maximum noise level / Voltage sensitivity) LI5501 / LI5502...
  • Page 19 The internal oscillator is usually synchronized with an external reference signal by PLL and supplies a reference signal to the PSD. Its frequency can be set numerically and it can supply its harmonic to the PSD as a reference signal. LI5501 / LI5502...

  • Page 20: Figure 1-2 Block Diagram Of The Li5501 / Li5502

    1.3 Operating principle 1.3.2 Block diagram The block diagram of the LI5501 / LI5502 is presented and its main functions are explained. AC GAIN A IN B IN is LI5502 only B IN POWER REGULATOR 1Vrms ± 15 VDC DC GAIN...
  • Page 21 1st order low pass filter (LPF) and 1 to 4 of it are cascade-connected (equivalent to 6 / 12 / 18 / 24 dB/oct attenuation slope). Increasing the time constant (TC) and attenuation slope (SLOPE) narrows the bandwidth and removes more noise, but slows an output response. LI5501 / LI5502...
  • Page 22 Measured values X and Y of a lock-in amplifier are an RMS value of orthogonal phase components. By operating X and Y, an RMS value and phase of signal can be obtained. Amplitude ratio and phase difference between two channels can also be obtained*. *LI5502 only LI5501 / LI5502...
  • Page 23 Not only the reference signal frequency but also the signal sampling rate, output update rate, and rate for recording to the data memory by the internal timer are also synchronized with the external 10MHz frequency. LI5501 / LI5502...
  • Page 24 1.3 Operating principle (Blank) 1-10 LI5501 / LI5502...

  • Page 25: 2． Preparation Before Use

    2.1 Inspection ............. 2-2 2.2 Installation ............2-3 2.2.1 General cautions ............2-3 2.2.2 Installation environment ..........2-3 2.2.3 Mounting ..............2-5 2.3 Grounding and power connections ....... 2-6 2.4 Firmware update ..........2-7 2.5 Calibration ............2-7 LI5501 / LI5502...

  • Page 26: Inspection

    Inspection ◼ Safety check Before using the LI5501 / LI5502, read the “Safety Precautions” section at the beginning of this manual and perform the safety checks described there. Before connecting the instrument to a power supply, read “2.3 Grounding and power connections”...

  • Page 27: Installation

    CAUTION Attention should be given to the following item to reduce the possibility of damage to the LI5501 / LI5502.  Because the instrument is small and lightweight, if it is moved while connected to other devices by cables, it may fall.
  • Page 28 Signal cables should be placed away from power cords of other equipment that may produce inductive noise. Failure to do so may result in instrument malfunction or a measurement error. Warm up the instrument for at least 20 minutes before use for accurate measurement. LI5501 / LI5502...

  • Page 29: Mounting

    If the ambient temperature exceeds the specification or the intake and exhaust holes are blocked when the equipped FAN is used, the performance of the instrument may decrease or it may be damaged. LI5501 / LI5502...

  • Page 30: Grounding And Power Connections

    ◼ Power supply specifications Power supply voltage range: ± 14 to 16 VDC Current consumption: +400 mA / 110 mA (LI5501) − +480 mA / 120 mA (LI5502) − initial settings, no input siganls, and no loads...

  • Page 31: Firmware Update

    If the instrument fails to satisfy the specifications in the performance test, the NF Corporation will make adjustments or calibrate the instrument to restore performance. If an adjustment or calibration is required, please contact the NF Corporation or its authorized agent.
  • Page 32 2.5 Calibration (Blank) LI5501 / LI5502...

  • Page 33: 3． Names Of Each Part

    3.2.2 Reference signal I/O connectors ........ 3-6 3.2.3 Analog data output connectors ........3-7 3.2.4 The other input connector ........... 3-7 3.2.5 Power supply connector ..........3-8 3.3 Power-on .............. 3-9 3.3.1 Confirmation before power-on ........3-9 3.3.2 Power-on ..............3-9 LI5501 / LI5502...

  • Page 34: Names And Functions Of Each Part

    Sine wave 0.4 to 6 Vp-p or TTL Zin: 1 MΩ OSC OUT Internal oscillator output connector 9.5 mHz to 1.05 MHz Sine wave 0 to 1 Vrms or TTL Figure 3-1 Top side LI5501 / LI5502...

  • Page 35: Figure 3-2 Rear Side

    Blinks when the calibration information is lost and the specifications CONDITION Green cannot be maintained due to some trouble When it blinks, please contact the NF Corporation or its authorized agent as it is malfunction. The followings applies only when the external 10 MHz synchronization is enabled.

  • Page 36: I/O Connectors

    Do not apply a voltage exceeding the maximum input range to the input connectors. Doing so may damage the instrument. ！ CAUTION Do not apply a voltage to the output connectors. Doing so may damage the instrument. LI5501 / LI5502...

  • Page 37: Signal Input Connectors

    22 Ω (nominal value)  Internal ground Signal ground ± 1Vpk ！ CAUTION If a voltage exceeding 1.0 V is applied between the signal ground and the internal ground, a large current will flow and damage an internal circuit. LI5501 / LI5502...

  • Page 38: Reference Signal I/O Connectors

    If an exceeding voltage is applied to the OSC OUT terminal, an overvoltage will be detected and an internal circuit will be disconnected. After the overvoltage is removed, the disconnection will be restored automatically. The non-destructive maximum input voltage of the OSC OUT terminal is ± 15 V (noiminal value). LI5501 / LI5502...

  • Page 39: Analog Data Output Connectors

    ⚫ Input impedance Approximately 500 Ω, AC-coupling ⚫ Signal level 0.5 to 5 Vp-p ⚫ Non-destructive maximum input voltage 10 Vp-p ⚫ Withstand voltage (allowable voltage to enclosure) ± 42 Vpk (DC + ACpeak) 2000p 10MHz IN ± 42Vpk LI5501 / LI5502...

  • Page 40: Power Supply Connector

    ⚫ Voltage range ± 14 to 16 VDC ⚫ Current consumption Approximately +400 mA / -110 mA (LI5501) Approximately +480 mA / -120 mA (LI5502) initial settings, no input signals, and no loads -15V...

  • Page 41: Power-On

    Refer to “2.3 Grounding and power connections”. 3.3.2 Power-on The LI5501 / LI5502 have no power switch. Supply power to the instrument from an external power supply. A typical connection diagram is shown below. When the power is turned on, the settings of the configuration memory number corresponding to the MODE switch number are recalled.
  • Page 42 3.3 Power-on (Blank) 3-10 LI5501 / LI5502...

  • Page 43: 4． Basic Settings

    4.1.2 Phase shift and harmonics measurement ....4-4 4.1.3 Oscillator output ............4-6 4.1.4 Analog data outputs ............ 4-7 4.1.5 Sensitivity and dynamic reserve ......... 4-8 4.1.6 Filters ................ 4-10 4.1.7 PSD input offset adjustment ........4-14 4.2 Initial settings ............. 4-15 LI5501 / LI5502...

  • Page 44: Setting Items

    4.1 Setting items Setting items This section describes setting items of the LI5501 / LI5502. 4.1.1 Reference signal settings A reference signal serves as frequency and phase reference. This section describes how to select reference signal settings. 1) Reference signal source Select a reference signal source from below to synchronize with the instrument.
  • Page 45 However, since the phase do not match, the phase adjustment is required every time the internal oscillator frequency is changed. Generally, once a signal (oscillation) stops, the phase is shifted, so the phase adjustment is required again. LI5501 / LI5502 EXT OSC DATA...

  • Page 46: Phase Shift And Harmonics Measurement

    ◼ Automatic phase shift adjustment By executing this adjustment, the reference signal phase shift amount is set so that the Y and θ outputs are equal to zero. However, it cannot be executed during the UNLOCK state. LI5501 / LI5502...
  • Page 47 ⚫ Multiplication: 1 to 63 (integer) ⚫ Phase: −180.000° to +179.999°, 1m° resolution ◼ Note The frequency range of harmonic, subharmonic, fractional harmonic, and multiplier oscillation output need to be within the synchronizable frequency range. LI5501 / LI5502...

  • Page 48: Oscillator Output

    The output amplitude and DC offset can be set only when the output waveform is SIN (sine wave). ⚫ Amplitude: 0 to 1 Vrms, 1 mVrms resolution ⚫ DC offset: 0 to ± 5 V, 5 mV resolution DC offset Sine wave Amplitude 1 Vrms max 3 Vp-p (nominal value) LI5501 / LI5502...

  • Page 49: Analog Data Outputs

    Parameters related to B IN are available only for the LI5502. ◼ Disabling analog data outputs The DATA1 and DATA2 output terminals can be disabled. Doing so stops the clock signal to the D/A converter, which reduces noise and is resistant to interference when measuring minute signals. LI5501 / LI5502...

  • Page 50: Sensitivity And Dynamic Reserve

    1 Vrms HIGH 0.2x 5 μVrms to 1 Vrms ◼ Note If the DR setting is changed and the voltage sensitivity is out of range, the sensitivity may be changed corresponding to the DR setting after the change. LI5501 / LI5502...
  • Page 51 500 nV ――― ――― ――― ――― 200 nV 100 nV ――― ――― ――― ――― ――― ――― ――― ――― ――― ――― 50 nV ――― ――― ――― ――― ――― ――― 20 nV ――― ――― ――― ――― ――― ――― 10 nV LI5501 / LI5502...

  • Page 52: Filters

    By cascade-connecting 1 to 4 stages of this filter, the attenuation slope of 6 to 24 dB/oct (20 to 80 dB/dec) can be obtained. First-order low pass filter 6dB/oct 12dB/oct 18dB/oct Reference signal 24dB/oct Cascade-connected filters 4-10 LI5501 / LI5502...
  • Page 53 6, 12, 18, and 24 dB/oct respectively The RMS noise value Vm included in the output (measured value) can be obtained using the following expression.  Here, Vn indicates the noise density of the input and B indicates the equivalent noise bandwidth. 4-11 LI5501 / LI5502...
  • Page 54 13.1 T This is the case of analog filter. Since the instrument realizes this filter by digital Time (multiple of T) processing, the filter characteristics when the time constant is small differ slightly from the above. 4-12 LI5501 / LI5502...
  • Page 55 The moving average filter is connected after the TC filter. Frequency response of moving average filter Diagram of filters (Averaging interval equals to 1 cycle) Moving average filter Cascade-connected time constant filters Reference signal Ripple F: Signal frequency 4-13 LI5501 / LI5502...

  • Page 56: Psd Input Offset Adjustment

    • Set input signals to zero. • Warm up the instrument sufficiently so that a temperature drift after the adjustment can be reduced. • Keep the power supply voltage and ambient temperature as constant as possible. 4-14 LI5501 / LI5502...

  • Page 57: Initial Settings

    4.2 Initial settings Initial settings The LI5501 / LI5502 will be initialized at the following conditions below. • When shipped from a factory and the MODE switch is set to “F” All of the settings are the factory default settings.
  • Page 58 B IN EXPAND multiplier <PSD input offset > Default, Automatic adjustment Default Offset amount   <Communication>   STATUS, FREQ-H, FREQ-L, , θ , θ Measurement data , θ parameters RATIO, PHASE up to 7 words from above 4-16 LI5501 / LI5502...
  • Page 59 The followings are not stored in the resume memory. ・Measurement data stored in the measurement data buffer ・Latest measurement data The commands with respect to B IN and the measurement data parameters (X θ , RATIO, and PHASE) are only applicable to the LI5502. 4-17 LI5501 / LI5502...
  • Page 60 4.2 Initial settings (Blank) 4-18 LI5501 / LI5502...

  • Page 61: 5． Remote Control

    5.4 Status system ............. 5-39 5.4.1 Overview of status system ........5-39 5.4.2 Status byte ..............5-40 5.4.3 Standard event status ..........5-41 5.4.4 Operation status ............5-43 5.4.5 Questionable status ..........5-46 5.5 Error messages ..........5-49 LI5501 / LI5502...

  • Page 62: Preparation Before Use

    It is available on our web site (https://www.nfcorp.co.jp). 5.1.2.2 Connections and cautions The LI5501 / LI5502 should be connected directly to the USB connector of the computer by a commercial USB cable. The instrument may not operate correctly if the connection is made via a USB hub.

  • Page 63: Lan Overview

    The LI5501 / LI5502 can communicate by using the TCP/IP protocol. 5.1.3.2 Connections The LI5501 / LI5502 can distinguish a straight and a crossover cable, so either type of cable can be used. 5.1.3.3 Settings of the LI5501 / LI5502 Configure the following settings when the instrument is connected via the USB interface.

  • Page 64: Precautions Of Communication

    A set of commands and responses must end with a terminator that indicates the end of the message. The response message terminator sent by the LI5501 / LI5502 is always LF. The program message terminator received by the LI5501 / LI5502 is always LF.

  • Page 65: List Of Commands And Command Tree

    List of commands and command tree 5.2.1 List of commands The remote control commands and subsystem commands for the LI5501 / LI5502 are listed in the “Table 5-1 Common commands” and “Table 5-2 Subsystem commands”. The descriptions here are in short-form format, which omits all optional keywords. For the long-form format and the parameter format of the commands, refer to pages listed in the column of “Details”.
  • Page 66 Sets phase shift amount (B IN) P5-32 ✓ :PHAS2:AUTO:ONCE Automatic phase adjustment (B IN) P5-32 :ROSC:SOUR Selects reference frequency source ✓ P5-32 ✓ :VOLT:AC:RANG Sets voltage sensitivity (A IN) P5-32 ✓ :VOLT2:AC:RANG Sets voltage sensitivity (B IN) P5-33 LI5501 / LI5502...
  • Page 67 － TRIGger subsystem :TRIG:DEL Sets trigger delay time P5-38 － :TRIG Executes trigger (starts recording) P5-38 － :TRIG:SOUR Sets trigger source P5-38 － Note: The commands with respect to B IN are only applicable to the LI5502. LI5501 / LI5502...

  • Page 68: Command Tree

    5.2 List of commands and command tree 5.2.2 Command tree The subsystem command tree for the LI5501 / LI5502 is shown below. Brackets ([ ]) in the tree indicate optional keywords. <Root> Command tree 1/2 ABORt CALCulate[1] OFFSet MULTiplier FORMat...
  • Page 69 SOURce FREQuency [CW] MULTiplier VOLTate [LEVel] [IMMediate] [AMPLitude] OFFSET OUTPut PHASe INITiate TYPE STATus OPERation [EVENt] CONDition ENABle NTRansition PTRansition QUEStionable [EVENt] CONDition ENABle NTRansition PTRansition SYSTem ERRor? CONTrol REMote IPADdress MASK GATE TRIGer DELay [IMMediate] SOURce LI5501 / LI5502...

  • Page 70: Commands

    5.3.1.2 SCPI commands The program messages of the LI5501 / LI5502 consist of the common commands and subsystem commands. Here, these command formats and the subsystem command tree are explained.

  • Page 71: Figure 5-2 Subsystem Command Syntax

    For convenience and explanation, uppercase and lowercase characters are used in keywords, but actual commands are case insensitive. The “Table 5-3” shows an example for the keyword “OUTPut”. 5-11 LI5501 / LI5502...
  • Page 72 ([ ]) can be omitted. When the keyword is omitted, the instrument assumes that it has been received and analyzed. Taking the “:OUTPut[:STATe]” command for example, either the following commands can be used. :OUTPut:STATe :OUTPut 5-12 LI5501 / LI5502...

  • Page 73: Figure 5-3 Numerical Parameter Syntax ()

    <NR1>, <NR2>, and <NR3>. The syntax for numerical parameters is illustrated below. <NR1> <NR2> <NR3> Figure 5-3 Numerical parameter syntax (<NRf>) Digit − Figure 5-4 Numerical parameter syntax (<NR1>) Digit Digit − Figure 5-5 Numerical parameter syntax (<NR2>) 5-13 LI5501 / LI5502...

  • Page 74: Figure 5-6 Numerical Parameter Syntax ()

    Figure 5-6 Numerical parameter syntax (<NR3>) Here, the syntax for the mantissa and the exponent of “Figure 5-6” is illustrated below. Digit Digit Digit − Digit Figure 5-7 Mantissa syntax Digit − Figure 5-8 Exponent syntax 5-14 LI5501 / LI5502...

  • Page 75: Figure 5-9 Discrete Parameter Syntax ()

    The syntax for Boolean parameters is illustrated below. The Boolean parameter value of “0” is interpreted as “false” (OFF) and all the other values are interpreted as “true” (ON). <NBOL> Figure 5-10 Boolean parameter syntax (<BOL>) 5-15 LI5501 / LI5502...

  • Page 76: Figure 5-11 Text String Parameters ()

    Query parameters are specified after the “?” of a query. [Suffixes] In some commands, it is possible to set a value by specifying an SI suffix and unit. The syntax for suffixes is illustrated below. SI suffix Unit Figure 5-12 Suffix syntax 5-16 LI5501 / LI5502...

  • Page 77: Figure 5-13 Program Message Syntax

    In response messages, commas and semicolons are used as separators. When multiple values are returned by a single command, a response message will be delineated by commas. When a single program message contains multiple queries, a response message will be delineated semicolons. 5-17 LI5501 / LI5502...

  • Page 78: Figure 5-15 Integer Response Data Syntax ()

    The syntax for numerical response data is illustrated below. Digit − Figure 5-15 Integer response data syntax (<NR1>) Digit Digit − Figure 5-16 NR2 numerical response data syntax (<NR2>) Digit Digit Digit − − Figure 5-17 NR3 numerical response data syntax (<NR3>) 5-18 LI5501 / LI5502...

  • Page 79: Figure 5-18 Discrete Response Data Syntax ()

    Figure 5-19 Numerical Boolean response data syntax (<NBOL>) (4) Text string response data (<STR>) The syntax for text string response data is illustrated below. ” “ ” ” (character) Character other than “ Figure 5-20 Text string response data syntax (<STR>) 5-19 LI5501 / LI5502...

  • Page 80: Figure 5-21 Defined-Length Arbitrary Block Response Data Syntax ()

    Figure 5-21 Defined-length arbitrary block response data syntax (<DBLK>) 5.3.2 Sequential commands The commands of the LI5501 / LI5502 are all sequential commands. After execution of a command is completed, the next command will be executed. There are no overlapping commands.

  • Page 81: Commands Description

    Queries the instrument-specific information Response <corporation>,<model>,<serial>,<ver> format <corporation> <STR> Company name (NF Corporation) <model> <STR> Model name (LI5501 / LI5502) <serial> <STR> Serial number <ver> <STR> Firmware version Comments The response is returned without including double quotation marks. NF Corporation,LI5501 / LI5502,1234567,Ver1.00 *OPC 5.3.3.5...
  • Page 82 Executes the self-diagnostic test and queries its results Response <NR1> format Comments It is the SCPI command. “0” is always returned. *WAI 5.3.3.12 Explanation Standby for end of overlapping command execution Comments There are no overlapping commands for the LI5501 / LI5502. 5-22 LI5501 / LI5502...
  • Page 83 :CALCulate1:OFFSet <value> 5.3.3.16 :CALCulate1:OFFSet? Explanation Sets and queries the offset value for the X output on the A IN side Parameter <value> <NRf> Offset [%] Range: -120.00 to +120.00 Resolution: 0.01 Response <NR2> format Comments ― 5-23 LI5501 / LI5502...
  • Page 84 :CALCulate3:OFFSet <value> 5.3.3.20 :CALCulate3:OFFSet? Explanation Sets and queries the offset value for the X output on the B IN side Parameter <value> <NRf> Offset [%] Range: -120.00 to +120.00 Resolution: 0.01 Response <NR2> format Comments ― 5-24 LI5501 / LI5502...
  • Page 85 Explanation Queries the contents of the measurement data buffer (measurement values) Parameter <value> <DISC> Size [points] Range: 1 to 65536 Response <NR1> | <DISC> format Comments :DATA:DELete 5.3.3.24 Explanation Clears the measurement data buffer Comments ― 5-25 LI5501 / LI5502...
  • Page 86 Sets and queries the measurement data buffer size Parameter <value> <DISC> Size [points] Range: 1 to 65536 or INFinity Response <NR1> or <DISC> format Comments “INFinity” indicates that recording continues until the measurement buffer is full. 5-26 LI5501 / LI5502...
  • Page 87 Automatically adjusts the PSD input offset on the B IN side only once Comments ― :INPut2:OFFSet:RST 5.3.3.34 Explanation The PSD input offset amount on the B IN side is restored to the factory default setting. Comments ― 5-27 LI5501 / LI5502...
  • Page 88 Comments ― :ROUTe[:TERMinals] <value> 5.3.3.39 :ROUTe[:TERMinals]? Explanation Sets and queries the reference signal source Parameter <value> <DISC> Reference signal source RINPut: Input signal to the REF IN terminal IOSC: Internal oscillator Response <DISC> format Comments ― 5-28 LI5501 / LI5502...
  • Page 89 Explanation Sets and queries the attenuation slope of the time constant filter on the A IN side Parameter <value> <NRf> Attenuation slope [dB/oct] Range: 6 | 12 | 18 | 24 Response <NR1> format Comments ― 5-29 LI5501 / LI5502...
  • Page 90 <value> <NRf> Time constant [s] Range: 1E−6 to 10E+3 (1-2-5 sequence) Response <NR3> format Comments ― [:SENSe]:FREQuency[1]? 5.3.3.48 Explanation Queries the frequency Response <NR2> value format Range: 9.5E−3 to 1.05E+6, Resolution: 7digits, Unit: Hz Comments ― 5-30 LI5501 / LI5502...
  • Page 91 Automatically adjusts the phase shift amount so that the A IN side θ becomes zero Comments When this adjustment is done, signal amplitude can be determined from the parameter “X” and phase change can be determined from the parameter “Y”. 5-31 LI5501 / LI5502...
  • Page 92 ) and unit “V”, “MAX”, and “MIN” are available. Response <NR2> format Comments If the voltage sensitivity is out of range due to changing the dynamic reserve, it is automatically set to the nearest value within the range. 5-32 LI5501 / LI5502...
  • Page 93 Sets and queries the output state of the OSC OUT terminal Parameter <value> <BOL> Output state ON | OFF Response <NBOL> format Comments Only AC waveforms can be turned on and off. The DC offset is not affected. 5-33 LI5501 / LI5502...
  • Page 94 Comments ― :SOURce:VOLTage[:LEVel][:IMMediate]:OFFSet <value> 5.3.3.66 :SOURce:VOLTage[:LEVel][:IMMediate]:OFFSet? Explanation Sets and queries the DC offset voltage of the internal oscillator Parameter <value> <NRf> Offset voltage [VDC] Range: -5.000 to +5.000 Resolution: 0.005 Response <NR2> format Comments ― 5-34 LI5501 / LI5502...
  • Page 95 <value> <NRf> Positive operation status transition filter Range: 0 to 65535 Resolution: Default: 5296 (LI5501) 5552 (LI5502) Response <NR1> format Comments It is initialized when the power is turned on. Not initialized by the “*RST” command 5-35 LI5501 / LI5502...
  • Page 96 Parameter <value> <NRf> Positive transition filter Range: 0 to 65535 Resolution: Initial value: 339 (LI5501) 351 (LI5502) Response <NR1> format Comments It is initialized when the power is turned on. Not initialized by the “*RST” command 5-36 LI5501 / LI5502...
  • Page 97 Comments ― :SYSTem:REMote:LAN:MASK <value> 5.3.3.80 :SYSTem:REMote:LAN:MASK? Explanation Sets and queries the subnet mask Parameter <value> <STR> Subnet mask Range: 0 to 255 XXX. XXX. XXX. XXX Example) 255. 255. 255. 0 Response <STR> format Comments ― 5-37 LI5501 / LI5502...
  • Page 98 When the measurement data buffer is enabled, measurement data is recorded in the buffer by a trigger. Comments ― :TRIGger:SOURce <value> 5.3.3.85 :TRIGer:SOURce? Explanation Sets and queries the trigger source Parameter <value> <DISC> Trigger source EXTernal: By external signal BUS: By communication Use the “:TRIGger[:IMMediate]” command. Response <DISC> format Comments ― 5-38 LI5501 / LI5502...

  • Page 99: Status System

    5.4 Status system Status system 5.4.1 Overview of status system The status system of the LI5501 / LI5502 is illustrated in “Figure 5-22”. Questionable status registers Operation status registers Operation condition register Questionable condition register Positive/negative Positive/negative transition filter Standard event registers...
  • Page 100 MAV bit is being checked, first check that the MAV bit of the status byte is “1” by serial polling after the query is sent and then read the response message. Then confirm that the MAV bit has changed to “0” and proceed with the next operation. 5-40 LI5501 / LI5502...

  • Page 101: Figure 5-23 Structure Of The Standard Event Status

    Always 0 (not used) RQC & Operation completed OPC & (Standard event status (Standard event enable register) status register) Standard event Logical OR Status summary Status byte ESB (bit 5) Figure 5-23 Structure of the standard event status 5-41 LI5501 / LI5502...
  • Page 102 The register will have been cleared to “0” immediately after the power is turned on. Parameters for setting and response messages to each register are the sums of all the weights of the bits that have the value of “1”. 5-42 LI5501 / LI5502...

  • Page 103: Figure 5-24 Structure Of The Operation Status

    The structure of the operation status is illustrated in “Figure 5-24”. The operation condition register (OPCR) indicates a status of the LI5501 / LI5502 as shown in “Table 5-6”. The transition filter can detect changes in the conditions and generates events.
  • Page 104 The register will be cleared to “0” if it is queried. The register can also be cleared by the “*CLS” command. The register will have been cleared to “0” immediately after the power is turned on. 5-44 LI5501 / LI5502...
  • Page 105 “0” → “1” or “1” → “0” Event register cannot be “0” “0” changed to “1”. Parameters for setting and response messages to each register are the sums of all the weights of the bits that have the value of “1”. 5-45 LI5501 / LI5502...

  • Page 106: Figure 5-25 Structure Of The Questionable Status

    5.4.5 Questionable status The structure of the questionable status is illustrated in “Figure 5-25”. The questionable condition register indicates an abnormal staus of the LI5501 / LI5502 as shown in “Table 5-7”. The transition filter can detect changes in the conditions and generates events.
  • Page 107 This command can set and query the questionable event enable register. Set the value “0” to clear the register to “0”. There are no other clear commands. The register will have been cleared to “0” immediately after the power is turned on. 5-47 LI5501 / LI5502...
  • Page 108 “0” → “1” or “1” → “0” Event register cannot be “0” “0” changed to “1”. Parameters for setting and response messages to each register are the sums of all the weights of the bits that have the value of “1”. 5-48 LI5501 / LI5502...

  • Page 109: Error Messages

    The command cannot be executed because of constraint -221 Settings conflict conflicts among multiple settings. -222 Data out of range The data is outside of the valid range. Illegal parameter The parameters are incorrect (inappropriate other than -224 “Data type error”). value 5-49 LI5501 / LI5502...
  • Page 110 If a problem occurs that results in data remaining in the input buffer or output buffer, the buffers can be cleared with the device clear messages (DCL, SDC). A error other than those described above may occur in some situations. In such case, check the error message for a summary. 5-50 LI5501 / LI5502...

  • Page 111: 6． Advanced Settings

    6.1.1 Setting of measurement data parameters ....6-2 6.1.2 Format ................. 6-3 6.1.3 Triggering system ............6-5 6.1.4 Sample programs of data acquisition ......6-6 6.2 Configuration memory .......... 6-8 6.2.1 Recall settings............. 6-8 6.2.2 Save settings .............. 6-8 6.3 FAN control ............6-9 LI5501 / LI5502...

  • Page 112: Measurement Data Buffer

    6.1 Measurement data buffer Measurement data buffer The LI5501 / LI5502 can acquire measurement data in two ways: Streaming, which uses the internal memory and can acquire a large amount of data, and Querying, which queries the latest measurement data with the “:FETCh?” command.

  • Page 113: Format

    This is converted to an unsigned 16-bit integer format (0 to 65,535) and the measurement value can be calculated from it. If the sensitivity setting when querying measured data is different from the setting when recording the data, correct measurement results cannot be obtained. LI5501 / LI5502...
  • Page 114 A measured frequency data is transferred after divided into A: FREQ-H and B: FREQ-L. If the sensitivity setting when querying measured data is different from the setting when recording the data, correct measurement results cannot be obtained. LI5501 / LI5502...

  • Page 115: Triggering System

    A computer receives data For continuous data acquisition, ・If the buffer is not full, data is output continuously. set the buffer size to INF. ・If the buffer is full, the instrument will be the awaiting state for data transmission. LI5501 / LI5502...

  • Page 116: Sample Programs Of Data Acquisition

    Send (":DATA:DATA? X") ' X: Number of required data points ' Requests sending measurement data Receive (MLIN_1, PHAS_1, MLIN_2, PHAS_2, MLIN_3, PHAS_3, ...) ' Reads out measurement data from the measurement data buffer LI5501 / LI5502...
  • Page 117 ' If readout is faster than recording, the buffer doesn’t become full and recording can continue. ' If the buffer becomes full, no more data will be recorded. Send (":DATA:FEED:CONT NEV") ' Stops recording after acquiring necessary data LI5501 / LI5502...

  • Page 118: Configuration Memory

    2) Recall settings by remote control Settings stored in specified memory number can be recalled by remote control. 6.2.2 Save settings 1) Save current settings Current settings (contents of the RESUME memory) can be saved to a specified user’s memory. LI5501 / LI5502...

  • Page 119: Fan Control

    When the fan is turned on, dust or foreign matter may be absorbed into the enclosure, resulting in corrosion and failure. Periodic maintenance (cleaning) is recommended. Intake Exhaust ！ CAUTION As an internal temperature of the instrument becomes hot, the enclosure and metal parts of the connectors also become hot. LI5501 / LI5502...
  • Page 120 6.3 FAN control (Blank) 6-10 LI5501 / LI5502...

  • Page 121: 7． Troubleshooting

    7． Troubleshooting 7.1 Error messages ............ 7-2 7.2 Abnormalities during measurement ...... 7-3 LI5501 / LI5502...

  • Page 122: Error Messages

    Main errors that occur during normal measurement are described in this section, along with their causes and how to deal with them. If the instrument requires repair, please contact the NF Corporation or its authorized agent. When requesting repair, please provide the error message and symptom.

  • Page 123: Abnormalities During Measurement

    Handling and Color ・The LED does not light up. ・Review the power supply voltage. ・The LED blinks during startup. ・Contact the NF Corporation or its CONDITION The calibration data was lost and authorized agent and request a Green the specified performance cannot repair.
  • Page 124 7.2 Abnormalities during measurement (Blank) LI5501 / LI5502...

  • Page 125: 8． Maintenance

    8.5 Performance tests ..........8-4 8.5.1 Introduction ..............8-4 8.5.2 Voltage measurement accuracy ......... 8-6 8.5.3 Analog outputs voltage accuracy........ 8-8 8.5.4 Phase accuracy ............8-9 8.5.5 Amplitude accuracy of the internal oscillator .... 8-11 8.6 Calibration ............8-12 LI5501 / LI5502...

  • Page 126: Introduction

    This instruction manual describes how you can easily check for proper operation of the instrument and performance test methods. For more advanced inspection, adjustment, calibration, and repair, contact the NF Corporation or its authorized agent. WARNING There are high temperature locations and Precision electronic components inside the instrument.

  • Page 127: Daily Maintenance

    Storage, repacking, and transport The LI5501 / LI5502 should be stored in a location that satisfies the storage conditions. Storage conditions → Refer to “2.2.2 Installation environment”. When packing the instrument for transportation, etc., use a box that is sufficiently strong and large enough to provide a surplus of space.

  • Page 128: Performance Tests

    NF Corporation or its authorized agent. This is available for a charge. If the performance tests indicate that the instrument does not satisfy the specifications, calibration or repair is required. In that case, please contact the NF Corporation or its authorized agent.
  • Page 129 Bandwidth: 10 MHz or more TBS2072B Time / division: 10 s / division or faster (Tektronix) For monitoring Others Coaxial cables 50 Ω, BNC, equivalent to RG58/U Shorted plug BNC shorted plug or 50 Ω BNC terminator Adapter BNC, Tee adapter LI5501 / LI5502...

  • Page 130: Voltage Measurement Accuracy

    Set the following specified amplitude, dynamic reserve, and method: sensitivity and read the measured value and multimeter. Judgement See the table below. (passing range): Tee adapter Coaxial cable (1m) Multimeter Coaxial cable (1m) 0.9921 V AC BNC female to dual banana plug adapter LI5501 / LI5502...
  • Page 131 _ _ . _ _ mV _ . _ _ _ *These are supplementary values, not guaranteed values. These values are generally in this range, but if these are significantly out of range, the instrument may be malfunctioning. LI5501 / LI5502...

  • Page 132: Analog Outputs Voltage Accuracy

    + _ _ . _ _ _ V _ _ _ . _ _mV _ _ _ . _ _ mV −100% - _ _ . _ _ _ V - _ _ . _ _ _ V LI5501 / LI5502...

  • Page 133: Phase Accuracy

    A IN 1 kHz _ _ _ . _ _ ° −1 to +1 ° B IN 1 kHz _ _ _ . _ _ ° −1 to +1 ° *This is a supplementary value, not guaranteed value. LI5501 / LI5502...
  • Page 134 1 kHz _ _ _ . _ _ ° −1 to +1 ° B IN 1 kHz _ _ _ . _ _ ° −1 to +1 ° *This is a supplementary value, not guaranteed value. 8-10 LI5501 / LI5502...

  • Page 135: Amplitude Accuracy Of The Internal Oscillator

    Coaxial cable (1m) Multimeter 0.9999 V AC BNC female to dual banana plug adapter Judgement Oscillator Frequency DMM reading [rms] Passing range amplitude 1 kHz 1 Vrms _ . _ _ _ _ V 0.955 to 1.045 V 8-11 LI5501 / LI5502...

  • Page 136: Calibration

    If the performance tests reveal that the instrument fails to satisfy the specifications, the NF Corporation will adjust or calibrate the instrument to restore performance. If calibration is required, please contact the NF Corporation or its authorized agent. Adjustment or calibration that is performed outside the warranty period is available for a charge.

  • Page 137: 9． Specifications

    9.5 Remote control interface ........9-10 9.6 Miscellaneous specifications ......9-11 9.7 External dimensions ........... 9-13 Nominal, typical, supplementary and approximate values These values imply the supplemental data of this instrument and do not guarantee the instrument performance. LI5501 / LI5502...

  • Page 138: Input Section

    This section describes specifications of the input terminals such as the signal input terminals and reference signal input terminal. 9.1.1 Signal inputs Input connector No. of channels LI5501: 1 (Terminal name: A IN) LI5502: 2 (Terminal names: A IN, B IN) Input type Single-ended Input impedance 1 MΩ...

  • Page 139: External Reference Frequency Input

    If a reference signal for frequency synthesis is applied to the 10MHz IN terminal from an external source, the internal oscillator generates the reference signal synchronized with that external 10 MHz frequency. Therefore, measurement can be performed without applying an external reference signal. LI5501 / LI5502...

  • Page 140: Output Section

    ± 12 V (no load), 16-bit resolution Output voltage range ± 10 mA or more Maximum output current Output impedance 440 Ω (nominal value) ± ( 0.5 % + 10 mV), relative to measured value Output voltage accuracy LI5501 / LI5502...

  • Page 141: Analysis Function

    Measurement signal system Frequency range 9.5 mHz to 1.05 MHz No. of channels LI5501: 1 (A IN) LI5502: 2 (A IN, B IN) b) Phase sensitive detector section Phase sensitive detector Dual-phase (R cosθ, R sinθ) ± 0.001 ° (supplementary value)
  • Page 142 If this function is used without the moving average filter, lower bits will be missing. Therefore, it is recommended to use the filter with an appropriate amount of averaging time when using this function. 1-2-5 sequence is recommended. LI5501 / LI5502...
  • Page 143 420 ms is measured, and then the correction value is set. By the adjustment execution command, the adjustment is ececuted. By the adjustment reset command, the correction value returns to the factory default setting. LI5501 / LI5502...
  • Page 144 Range of m (sub-harmonic): 1 to 64 Note: n/m times of reference signal frequency needs to be within the synchronization frequency range. d) Internal oscillator Frequency range 9.5 mHz to 1.05 MHz Frequency resolution 0.1 mHz ± 30 ppm (supplementary value) Frequency accuracy LI5501 / LI5502...
  • Page 145 (when 100 % relative to voltage sensitivity) RATIO 10 VDC (when 200 % amplitude ratio) θ, PHASE ± 10 VDC (when 179.999 ° or −180.000 ° respectively) Offset ± 120.00 % relative to voltage sensitivity for X and Y, 0.01% resolution LI5501 / LI5502...

  • Page 146: Digital Data Output

    Saturation in the moving average filter (MOV over) Saturation in the ratio operation (RATIO over) Overvoltage at the oscillator output (OSC over) Remote control interface USB 2.0 full speed, device class CDC 10BASE-T / 100BASE-TX, TCP/IP (socket communication) 9-10 LI5501 / LI5502...

  • Page 147: Miscellaneous Specifications

    (with dual tracking) recommended Operating voltage range ± 14 to 16 VDC Current consumption approximately +400 mA / -110 mA (LI5501) approximately +480 mA / -120 mA (LI5502) factory default settings, no input signals, no loads Connector...
  • Page 148 Applies to instruments that have a CE marking on the bottom External dimensions 200 mm (W) × 30 mm (H) × 150 mm (D) excluding metal fittings and protruding parts Weight Approximately 700 g main unit only, excluding accessories and metal fittings 9-12 LI5501 / LI5502...

  • Page 149: External Dimensions

    9.7 External dimensions External dimensions Figure 9-1 External dimensions of the LI5501 9-13 LI5501 / LI5502...

  • Page 150: Figure 9-2 External Dimensions Of The Li5502

    9.7 External dimensions Figure 9-2 External dimensions of the LI5502 9-14 LI5501 / LI5502...
  • Page 151 For repair service under warranty, the instrument must be returned to either NF or an agent designated by NF. The Purchaser shall prepay all shipping cost, duties and taxes for the instrument to NF from another country, and NF shall pay shipping charges to return the instrument to the purchaser.
  • Page 153 However, we assume no responsibility for any damage regarding the contents of this manual. • We assume no responsibility for influences resulting from the operations in this manual. Copyright 2022-2024, NF Corporation LI5501 / LI5502 INSTRUCTION MANUAL NF Corporation 6-3-20, Tsunashima Higashi, Kohoku-ku, Yokohama 223-8508 JAPAN Phone +81-45-545-8128 Fax +81-45-545-8187...
  • Page 155 NF Corporation...

This manual is also suitable for:

Li5502

Table of Contents