How to ensure the safety and maintenance of YOKOGAWA LS3300 AC power calibrator?

How to ensure the safety and maintenance of YOKOGAWA LS3300 AC power calibrator?

Product basic information

1. Product positioning and core functions

LS3300 is an AC power calibrator that uses the "phantom load method" to generate AC voltage, current, and power signals. It is mainly used for calibrating power meters and other equipment, supporting multiple wiring systems and synchronous operations to meet calibration needs in different scenarios.

2. Manual system and language version

Supporting manual: In addition to this manual, it also includes Chinese specific documents (IM LS3300-92Z1), European language safety manual (IM 00C01C01-01Z1), and global contact list (PIM 113-01Z2).

Language code: The "EN" in the manual number represents English, and "Z1" represents other languages such as Chinese. Users can obtain the corresponding version according to their needs.

Manual update: The content may change without prior notice due to product performance/feature upgrades. The latest version should refer to the official website; As of April 2025, it is the 8th edition, and the historical version gradually iterates from the 1st edition in August 2017.

Preparation before use

1. Packaging content inspection

Host and identification: Confirm that the host model is LS3300 (specification 1200V, 60A), and verify the model and suffix code through the side panel nameplate to avoid misdelivery.

Standard accessories: including 1 power cord with matching suffix code (such as - H for Chinese standard, - Q for British standard, etc., - Y without power cord needs to be provided), measuring wire (B8506ZK/B8506WA), crocodile clip adapter set, rubber foot cap, and complete manual. Confirm that the accessories are intact.

Optional accessories: Measurement wire, crocodile clip adapter, BNC cable, rack installation kit, etc. need to be purchased separately, and the selection needs to match the rated parameters of the equipment (such as 758917 measurement wire rated 1000V, 32A).

2. Installation and power connection

Installation requirements: It should be installed in a well ventilated area, with sufficient space reserved for the top/bottom air outlet and rear air inlet (top/bottom ≥ 20cm), avoiding direct sunlight, humidity, strong magnetic fields, and other environments; Supports desktop placement (adjustable movable feet) or rack installation (requires specialized kit), and is prohibited for outdoor or water environments.

Power specifications:

Rated voltage: 100-120VAC or 200-240VAC, allowable fluctuation range 90-132VAC, 180-264VAC, frequency 50/60Hz (allowable fluctuation range 48-63Hz).

The power cord must be designed specifically for the device and comply with local standards (such as the - H type used in China, rated at 250V). It must be plugged into a three hole socket with protective grounding. It is prohibited to cut off the grounding wire or use ungrounded extension cords.

Core functions and operations

1. Output parameter settings

(1) Voltage output setting

Range and Range: Supports ranges of 1V, 10V, 30V, 100V, 300V, and 1000V, with an output range of 0-125% of each range (set by "output level x level ratio", level ratio 0-120%). For example, a 10V range can output a maximum of 12.5V.

Key parameters: frequency 40-1200Hz, phase -180 ° to+359.999 °, power factor -1.0 to 1.0 (lead/lag can be set); When the voltage is ≥ 150V, a buzzing warning will be issued, and when the range is ≥ 300V, the "high voltage indicator light" will light up.

(2) Current output setting

Range and Range: The basic range is 30mA, 100mA, 1A, 10A, 50A, and can be extended to 20A, 30A, 100A, 150A when synchronizing multiple devices; Supports "external sensor mode" (500mV/5V output, voltage current conversion ratio needs to be set), with the same output range as the voltage logic (0-125% range).

Key parameters: Frequency, phase, power factor settings should be consistent with voltage. For high current outputs (such as 20A and above), the wiring system should be set to "1P2W (HI Current)" and multiple devices should be synchronized.

(3) Scanning function (Sweep)

Function purpose: By linearly adjusting the level ratio, the output can smoothly change within a specified range (such as checking for meter pointer sticking), supporting separate scanning of voltage/current.

Parameter settings: Scanning range 0-100%/105%/110%/120% (relative to output level), scanning time 8s/16s/32s/64s (time from 0% to 100%), can be set to "UP" or "DOWN", and will automatically hold when reaching the limit value.

2. Synchronous operation and wiring system

(1) Synchronization function

Multi device synchronization: Supports up to 3 LS3300 devices for synchronization, or synchronization with external devices such as 2558A; The master device is connected to the slave device's "OSC INPUT" terminal through the rear "OSC OUTPUT" terminal, synchronizing frequency and phase (external device synchronization only ensures frequency consistency, phase needs to be manually adjusted).

Synchronization settings: Set the master device to "INTernal" and the slave device to "EXTernal"; The "LINE" mode can also be set to synchronize the output with the power frequency.

(2) Wiring system

Supports 6 types of wiring systems, which need to be selected according to the calibration scenario. Different systems correspond to different device connection methods:

The number of devices required for the applicable scenarios of the wiring system

Single phase two-wire (1P2W) independent calibration of one device

Single phase two-wire (1P2W HI Current) high current output (20A and above) 2-3 units

Calibration of 2 single-phase three wire (1P3W) single-phase three wire systems

Three phase three wire (3P3W) calibration of two three-phase three wire systems

Three phase three wire (3V3A) three-phase three wire (three voltage three current method) calibration for 3 units

Three sets of three-phase four wire (3P4W) three-phase four wire system calibration

3. Other functions

Beeming control: Beeming can be turned on/off (such as voltage ≥ 150V, scan hold, etc.), but it cannot be turned off due to equipment failure (such as fan stoppage, overheating).

Display settings: Supports LCD screen off (wake up by pressing any key), brightness adjustment (0-10 levels), phase display is divided into Type1 (0 ° to the right) and Type2 (0 ° to the top).

Error log: Record error codes that occur during device operation (such as E.030 amplitude control error), clear after power failure, and can be viewed or cleared through the "UTILITY" menu.

Initialization: The device settings can be restored to factory default (except GP-IB and Ethernet settings), and in synchronous mode, the master device initialization will synchronize with the slave devices.

Communication interface

1. Interface type and specifications

The device supports three interfaces: USB, Ethernet, and GP-IB, which cannot be used simultaneously. Configuration needs to be switched through the "CONFIG" menu:

Interface type, specification parameters, purpose

USB 2.0 (HS/FS mode), supports USB-TMC protocol, connects to PC via Type B interface, and controls devices through USB-TMC commands

Ethernet 10BASE-T/100BASE-TX, RJ-45 interface, supports TCP/IP (VXI-11), DHCP network control, up to 3 devices can be connected simultaneously

GP-IB complies with IEEE 488.2 standard, addresses 0-30, supports NI GP-IB card traditional instrument control, and is suitable for GP-IB compatible systems

2. Remote/Local Mode Switching

Remote mode: After receiving a PC command, enter and the "REMOTE" indicator light will turn on. Only the "UTILITY" key can switch back to local mode, and other panel operations are invalid.

Local mode: Press the "UTILITY" key or receive a PC local switch command to enter, and the panel operation will return to normal.

Safety and Maintenance

1. Safety regulations

High voltage protection: The maximum output of the equipment is 1250Vrms. Before operation, remove metal jewelry and do not touch the output terminals or wires (even if the output is turned off, residual voltage may still cause electric shock).

Wiring safety: Before outputting, it is necessary to confirm that the wiring is correct (voltage wire connected to voltage terminal, current wire connected to current terminal, without short circuit/looseness); Do not touch the terminals during output, regularly check if the terminals are overheated or loose.

Fault handling: If there is smoke, odor, or abnormal noise, immediately cut off the power and disconnect the load; When the output automatically shuts off (such as overload protection), the fault needs to be eliminated (such as replacing the load) and then restarted.

2. Maintenance and repair

Filter cleaning: The rear air inlet filter needs to be checked and cleaned every 3 months. If it is dirty, clean it with neutral detergent and let it dry naturally. Blocking can cause the equipment to overheat; The filter screen is damaged and needs to be replaced by contacting a Yokogawa dealer.

Self check function: Automatically perform self check (check fan, voltage/current range, internal circuit) when turned on, or manually through the "UTILITY" menu. If the self check fails, an error code will be displayed (such as E.901 indicating fan failure).

Calibration and replacement: It is recommended to calibrate once a year to ensure accuracy. Cooling fans (3 years), filters (1 year), and LCDs (approximately 40000 hours) should be replaced according to the recommended cycle, and maintenance should be carried out by Yokogawa certified personnel.