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LZ-840 Fluxmeter
LZ-840 flux meter is a precision integrating flux meter, which uses different induction coil to measure AC and DC magnetic flux. It designed by adopting newest microprocessor and excellent operational amplifier, combining with advanced analog electronic technology. The main part is the analog integrator controlled by microprocessor. Analog integrator is quite flexible, with excellent property, it can run good in different field. Embedded microprocessor not only improves the function of the integrator, and also adds a variety of useful functions to the machine.
LZ-840 flux meter reflects fast, easy to use, automatic operation mode and manual mode can be selected at random. With the function of one-bottom automatic zero drift function makes LZ-840 to be a perfect magnetic measurement instrument. 


  • 16-key keyboard, with multiplexing function
  • AC/DC mode
  • Embedded microcomputer control, automatic or manual range    
  • 4 ¾ digit display resolution, LCD display with back light function
  • With superior drift adjust and suppress function, high anti-noise
  • Multiply unit selection: Gs, Tesla, Oe, Mx, MxN, Wb, WB/N, Vs, Wb*cm^2, A, %
  • Store five sets of measurements coil parameters, and automatically recognize standard probes
  • RS-232, output interface of relay switch ( apply for PLC)
  • It can be remote control by computer
  • With function of analog signal output
  • Hardware peak hold
  • High and low threshold alarm function for local and remote control
  • Flexible range expansion


Measuring Input signal No.: 1
Input type: 2 terminal, ground for reference
Input resistance: 100 k or 10 k
Maximum input voltage: 60 V
Display refresh rate: 3 times/s
DC Measurement Resolution: 4¾ digits
Integrating capacitor: 1 µF
Input resistance: 100 k, 10 k,10 k, 10 k
Range: 400mVs,  40mVs,  4 mVs, 0.4mVs
Resolution:  0.1 mVs,  0.01 mVs,  0.001 mVs, 0.0001 mVs
Accuracy : Migration        ±10 µVs ±DC integral drift
Threshold ± 0.25% readings (maximum change rate <10Vs/s)
Min. input: dφ/dt: 20 µVs/minute
Max. input: dφ/dt: 60Vs/s
Integral migration: ±1µVs/minute
DC Peak Value Resolution: 4¾ digits
Integrating capacitor: 1 µF
Input resistance: 100 k, 10 k, 10 k, 10 k
Range: 400mVs, 40mVs,  4 mVs,  0.4mVs
Resolution: 0.1 mVs, 0.01 mVs, 0.001 mVs,  0.0001 mVs
Accuracy :  Migration ±100 µVs ±DC integral drift
              Threshold ± 5% readings (maximum change rate <10Vs/s)
Max. input:  dφ/dt: 60Vs/s
AC Measurement Resolution: 4¾ digits
Integrating capacitor: 0.1 µF  
Input resistance: 100 k,  10 k,  10 k, 10 k
Range: 40mVs,  4mVs,  0.4 mVs,  0.04mVs
Resolution: 0.01 mVs, 0.001 mVs,  0.0001 mVs,  0.00001 mVs
Frequency response range: 2 Hz to 50 kHz
Accuracy:   ±1% reading ± 4uVs(10Hz-10kHz)
                    ±5% reading ± 4uVs(2Hz-10Hz: 10kHz-50kHz)
Integral drift: N/A
Front Panel Display: LCD display with back light function
Display resolution: 4¾ bit
Display refresh rate: 3 times/s
Display unit: Vs, WbN, MxN, Vs/N, Wb, Mx, Gs, T, %, Oe, A, Wb*cm^2,
Unit number: µ, m, K, M, G
Keys: 16 key keyboard, with the multiplexing function
Interface Parallel interface: DB-25 parallel port
Serial interface: Standard RS-232C, changeable baud rate
Alarm Quantity: 3
Set: High and low critical point a, in and out of region, turn on/off buzzer
Output: Buzzer sound , high , middle and low alarm relay close contactor.
Relay Relay quantity: 3
Methods: normally open, normally closed
Contactor load: 30 V DC at 2 A
Action: high and low alarm consistence , can be manually operated.
Monitor output range: ± 5V
Accuracy: ± 1% of display value of ± 10 mV, (DC to 10 kHz)
                  ± 5% of display value ± 10 mV, (10 kHz to 50 kHz)
Minimum load resistance: 1 K
Connector: DB25 core plug.
General Environment temperature: -15 ~ 55 ° C.
Power supply requirements: 100, 120, 220, 240 VAC, +5% -10%, 50 or 60 Hz, 50 VA
Size: 240mm W * 345mm L * 106 mm H
Weight: approx. 4 kg


Item Title Qua. Unit
1 LZ-840 Flux Meter 1 set
2 Power line 1 piece
3 User’s Manual 1 piece
4 Warranty Card 1 piece

As the products of our company are in constant updates, the change of products without pre-notice.