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