Introduction

TH1775 is a DC Bias Current Source (or DC Magnetization Current Source) used for inductance measurement of inductors and transformer windings with DC bias current. Except for constant current output, low additional error and wide frequency response range are important for bias current inductance measurement. High frequency LCR meter could be used, when the frequency response range is wide enough. MPU controlled auto current balance technology is adopted to realize AC+DC current overlap and constant current output from 0 to ±20A. Two TH1775 can be paralleled to supply a maximum current up to 40A.TH1775 permits high frequency measurement up to 1 MHz and can be directly controlled by TH2816A, TH2817A, TH2818 and TH2819. TH1773/TH1775 with its low additional error, wide frequency response range and sweep output function is widely used in DC biased inductance measurement. TH1775 also provides a perfect solution for magnetic material analysis.

Specifications

Measurement function
Frequency response range	1kHz-1M Hz
Current output mode	Single, Multi and Equal interval current output
Scanning mode	manual, auto (negative)
Sweep points	2—15 points
Delay time	0—99 seconds set
Output current direction	Forward/reverse conversion
Impedance measurement range	ωL < 1kΩ, L<8/I (H),I is output current
Display	20×2 large-character LCD display with backlight
Additional error of inductance measurement	£ 1%
Warm-up time	20 minutes
Working time	continuous 24 hours
Output signal
Output current range	-20A—20A
Set current resolution	200mA range: 0.1 mA 2A range: 1 mA 20A range: 10 mA
Current accuracy	±2% of reading±3 digits
Output voltage range	0-8 V
Others
Storage	20 sets of inner setting saved
Interface (option)	RS232C (only for connection with LCR meter), GPIB interface M/S control interface