1.1 INTRODUCTION

 This manual contains all the information required to install, operate and use the ALL-IN-ONE Instrument.(MODEL : US-9123D)

 Section 1 covers instrument identification, description, accessories, specifi- cations and other basic informations.

1.2 SPECIFICATIONS

1.2.1 FREQUENCY COUNTER SECTION

 ․ Input Characteristics

   - Sensitivity

                 1Hz ~ 100MHz : 25mVrms

              70MHz ~   1GHz  : 30mVrms

 ․ Input Impedance : 1MΩ/100pF

 ․ Damage Level   : AC & DC   X1  : 15Vrms

                     AC & DC   X10 : 150Vrms (Pushed ATT. S/W)

 ․ Frequency range : 1Hz ~ 1000MHz

 ․ Resolution : 0.1, 1, 10, 100Hz

 ․ Gate Time : 10S, 1S, 100mS, 10mS

 ․ Accuracy  : ±(1Hz +1 DIGIT + Time Base Error)

 ․ Standard Time Base

   -  Frequency : 10MHz

   -  Stability : 5 ppm(0℃~40℃)

   -  Aging Change : 5 ppm/year

 ․ Display : 8 Digits LED with unit annunciation

1.2.2 FUNCTION GENERATOR SECTION

 ․ Wave Forms

    Sine, Square, triangle, Skewed Sine, Ramp, Pulse, TTL Level Square

 ․ Output Frequency Range : 0.02Hz ~ 2MHz(7 Range)

 ․ VCF Voltage Input : 0 ~ 10V DC(Max : ±20V)

 ․ Output(All Waveforms)

   - Impedance : 50Ω±10%

                  600Ω±10%(up to 100KHz)

   - Connector : BNC

   - Amplitude(without attenuation)

                  2Vpp ~ 20Vpp(Open load)

   - Attenuator : -20dB

   - Frequency Variable Range :  100 : 1 or more

   - Symmetry Variable Range :   10 : 1 or more

 ※ Sine Wave

   - Distortion : Less than 1% (at 100KHz)

   - Harmonics

     More than 25dB below fundamental frequency(100KHz to 500KHz)

     More than 20dB below fundamental frequency(500KHz to 2MHz)

   - Flatness : ±0.3dB inner(at Max Output)

 ※ Square Wave

   - Symmetry : Less than±3%(at 1KHz)

   - Rise & Fall Time : Less than 150ns(at 1KHz)

 ※ Triangle Wave

   - Linearity : Less than 1% (up to 100KHz)

                 Less than 5% (100KHz to 2MHz)

 ※ TTL output

   - Rise & Fall Time : Less than 30ns(at 1KHz)

   - Output Level : More than 3V

 ※ Frequency Sweep

   - Sweep Time :  20ms to 2s

   - Internal Sweep Mode

     Linear

     Logarithmic

   - Sweep width :  More than 100 : 1

   - External Sweep by means of VCF Input

1.2.3 DIGITAL MULTIMETER SECTION

 ․ Display : 3 1/2 Digits LCD Display

 ․ Auto Ranging Selector

 ․ Basic Measurement : DCV, ACV, Ω(((․))), DCA, ACA

 ․ Measured Value Hold Function

 ․ Memory Mode for Zero Ohm Adjustment and Relative Continuity-Check with Audible Alarm

 ․ Full Overload Protection

 ․ Input Impedance : 10MΩ