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  Precision measurement of resistance                DC current bias for semiconductor devices
   High stability current driver for semiconductor    Light emitting devices ( LEDs, Laser diodes )
   High precision DC current bias for sensors         High stability DC current bias for any precision
   ( Thermal sensors, Hall sensors )                  Measurement of samples
   Automatic resistance measurements with Other intelligent instruments

    DC current output:
      Setting resolution:  4 1/2 digits
      Step resolution:  0.01mA
        Output range:  0-100mA
      Output accuracy: ±0.05% of settings ±100nA

    Temp. coefficient: ±0.01% of settings/℃

  DC voltage output and measurement
        Output range:  0-102.5V
      Measurement range:  0-102.5V
        Meas. resolution:  4 1/2 digits
      Max. resolution:  0.01V
        Meas. Rin:  > 5×108
      Meas. accuracy:  ±0.05% of settings ± 20mV.
        Temp. coefficient: ±0.01% of settings/℃.
  Front panel 
      Display: 2 line by 16 character

               backlight LCD. LED indicators.

      Display unit:  Current: mA;  Voltage: V
      Keypad: 10 keys functional keypad.
      Operation: Keypad intuitive operation
                       Display prompts

                   Front panel lockout.


RS-232C interface capabilities

        Baud rate:  9600, 19200, 57600 and 115200bps.
        Connector type:  9-pin D-style female plug.
        Connecting wiring:  DCE configured.
        Voltage level:  EIA RS-232C Specified.
        Transmission dist.:  15m or 50 feet max.
       Transmission mode:  Half duplex.
       Hardware handshake:  None.
        Character bits:  1 start, 8 data, no parity, 1 stop.
        Parity:  None.
        Terminator:  CR (0DH).
        Command rate: 6 commands max per second

Output mode2-wire at front panel


                         4-wire at rear panel

                            Quadrant I (IOUT>0, VOUT>0)
YL4020  Current Source
Front panel:LED、keypad
Output connector: Dual banana socket at front panel
                              4 wire connector plug at rear panel
Ambient temp.: 15-35 ℃at rated accuracy
                           5-40℃ with reduced accuracy
Power requirement
                   AC 220V(-10% to +5%), 50-60Hz, 40VA max
Size: W′H′D = 217mm×88mm×317mm
   Heat sink and connector plug on rear panel not involved

Weight: 2kg typically.

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