Victor VC2003 - User Manual

1
DIGITAL
DIGITAL
DIGITAL
DIGITAL
DIRECT
DIRECT
DIRECT
DIRECT
COMPOSITE
COMPOSITE
COMPOSITE
COMPOSITE
FUNCTION
FUNCTION
FUNCTION
FUNCTION
GENERATOR
GENERATOR
GENERATOR
GENERATOR
OPERATION
OPERATION
OPERATION
OPERATION
MANUAL
MANUAL
MANUAL
MANUAL
1.
1.
1.
1.
GENERAL
GENERAL
GENERAL
GENERAL
The instrument is a DDS digital direct composite function generator. It is cored by CPU, employs many large scale integrated circuits, it has the following features:
(1) High precise for frequency, high stability.
(2) Purity waveform, small distortion.
(3) Non-transition process, fast frequency change-over time ： can be stable instant
(4) Non-limitation on ranges ： unnecessary to changes ranges, frequency covering factor can be 10
8.
(5) Sweeping characteristics ： many kinds of sweeping modes are selectable and can pause randomly, LED will display the current frequency value; can sweep meticulously o n
narrow band; can set initial frequency, terminal frequency, sweeping steps and time interval.
(6) Modulation characteristics ： it has amplitude modulation function, the modulation signal can be generated by either inner signal source or outer input, the depth is adjusted
and will not be effected by carrier wave frequency and output amplitude.
(7) Convenient keyboard operation.
(8) Stability and reliability.
2.
2.
2.
2.
TECHNICAL
TECHNICAL
TECHNICAL
TECHNICAL
DATA
DATA
DATA
DATA
AND
AND
AND
AND
SPECIFICATON
SPECIFICATON
SPECIFICATON
SPECIFICATON
2-1.
2-1.
2-1.
2-1.
WAVEFORM
WAVEFORM
WAVEFORM
WAVEFORM
CHARACTERISTIC:
CHARACTERISTIC:
CHARACTERISTIC:
CHARACTERISTIC:
sine-wave, TTL level square wave
waveform amplitude resolution: 10bit
sine wave harmonic distortion: -40 dBc （ frequency ＜ 1M Hz ） , -30 dBc （ frequency ≥ 1M Hz ）
sine wave THD ： ＜ 1% (high resistance, 1KHz)
TTL level square wave rise time: ≤ 20ns
Square wave overshoot: ≤ 5%
2-2.
2-2.
2-2.
2-2.
FREQUENCY
FREQUENCY
FREQUENCY
FREQUENCY
CHARACTERISTIC:
CHARACTERISTIC:
CHARACTERISTIC:
CHARACTERISTIC:
frequency range: 1Hz —— 3MHz
resolution: less than 1MHz : 0.01Hz ； 1MHz and more than 1MHz: 0.1Hz
frequency tolerance: ≤ ± （ 5 × 10
－
5
＋ 30Hz+1d ）
frequency stability: ≤± 50ppm （－ 40 ℃—— ＋ 85 ℃ ） （ use the low temperature drift crystal oscillator with P LL phase-lock circuit ） . Custom-made can be done if frequency
stability requires to be ± 20ppm or less.
2-3.
2-3.
2-3.
2-3.
AMPLITUDE
AMPLITUDE
AMPLITUDE
AMPLITUDE
CHARACTERISTIC:
CHARACTERISTIC:
CHARACTERISTIC:
CHARACTERISTIC:
amplitude range: 10mV
p-p
—— 16V
p-p
（ high resistance ） ， 5mV
p-p
—— 8V
p-p
（ 50 Ω ）
display: 3 digit s
amplitude error: ≤ ± (5%+100 mV
p-p
) （ high resistance, 1KHz, 1 — 16V
p-p
）
amplitude stability: ≤± 5% （ 1hr, high resistance, 1KHz,16V
p-p
）
flatness: ≤ ± 0.5dB （ ≤ 100KHz ） , ≤± 0.8dB （ 100KHz — 1MHz ） , ≤± 2dB （ 1MHz — 2MHz ） , ≤ ± 3dB （ 2MHz — 3MHz ） , （ less than 1Hz, the frequency amplitude i s unstab le ）
output impedance: 50 Ω （ ± 10% ）
TTL level output characteristic ： low level: ＜ 0.3V ； high level: ＞ 4.2V （ high resistance ）
2-4.
2-4.
2-4.
2-4.
DRIFT
DRIFT
DRIFT
DRIFT
CHARACTERISTIC:
CHARACTERISTIC:
CHARACTERISTIC:
CHARACTERISTIC:
drift range: 0V —— ± 6.4V （ high resistance ） ， 0V —— ± 3.2V （ 50 Ω ）
resolution: 50mV （ high resistance ）
drift error: ≤ ± （ 5%+100mV ） （ 1hr, high resistance, 1KHz, 10V
p-p
）
2-5.
2-5.
2-5.
2-5.
MODULATION
MODULATION
MODULATION
MODULATION
CHARACTERISTIC:
CHARACTERISTIC:
CHARACTERISTIC:
CHARACTERISTIC:
amplitude modulation: AM
modulate waveform ： （ interior amplitude modulation ） sine wave: 400Hz ± 10%, 1000Hz ± 10% 2 ranges
modulation depth ： 1% —— 100%
modulation source ： inner modulation source ， outer modulation source
outer modulation characteristic ： input impedance ： 600 Ω
input level ： the modulation depth is 50% at 0dB
input frequency response ： 100Hz —— 100KHz （ ± 3dB ）

Summary

General Overview of the Function Generator

Technical Data and Specifications

Waveform Characteristics

Details waveform types, distortion, rise time, and overshoot characteristics.

Frequency Characteristics

Covers frequency range, resolution, tolerance, and stability.

Amplitude Characteristics

Defines amplitude range, error, stability, flatness, and output impedance.

Drift Characteristics

Specifies drift range, resolution, error, and time.

Modulation Characteristics

Details AM modulation, depth, source, and input characteristics.

Sweep and Display Specifications

Sweep Characteristics

Explains frequency sweep modes and characteristics.

Display Information

Lists the indicators shown on the 8-digit LED display.

Power Source Requirements

Specifies voltage and frequency requirements for the power source.

Ambient Conditions

Defines operating temperature and humidity ranges.

Physical Specifications

Provides the physical dimensions and weight of the instrument.

Panel Description and Operation

Displaying Area Details

Details the 8 LED indicators and 8 LED displays on the panel.

Function Key Area Layout

Lists the function keys on the instrument panel.

Number Key Area and Units

Details the number keys, decimal point, backspace, and unit keys.

Terminal Functionality

Explains the function of external terminals like EXT, TTL, and Sine output.

Rear Panel Components

Identifies power switch, voltage switcher, and fuse box on the rear panel.

Operational Instructions

Start-Up Procedure

Covers power connection, switch-on, and preheating recommendations.

Data Input Methods

Explains methods for digital input and data modification using keys.

Frequency Setting Guide

Details how to set the output frequency using specific keys and units.

Amplitude and DC Offset Setup

Describes setting output amplitude and DC offset, including load considerations.

Mode Selection Overview

Outlines how to select output modes like Common, Modulation, and Sweep.

Common Mode Operation

Defines the default mode with frequency and amplitude settings.

Inner Modulation Configuration

Explains setting AM modulation depth, source, and modulation signal frequency.

Outer Modulation Configuration

Covers using external signals for modulation and their depth relationship.

Linearity Frequency Sweep Setup

Details setting initial, terminal, and spacing frequencies for linear sweep.

Logarithm Frequency Sweep Setup

Explains setting parameters for logarithm sweep mode.

Frequency Sweep Operation Explanation

Clarifies key operations during frequency sweep modes.

Important Notes and Warnings

Functional Block Diagram and Final Notes

Functional Block Diagram

Shows the internal functional blocks and data flow of the generator.

Disclaimer and Contact Information

Contains disclaimers regarding specifications, errors, and improper operation.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

This document describes a Digital Direct Composite Function Generator, a CPU-cored instrument utilizing large-scale integrated circuits.

Function Description

The device is designed to generate various waveforms, including sine waves and TTL level square waves, with high precision and stability. It offers a wide range of frequency and amplitude settings, along with modulation and sweeping capabilities. The generator can produce signals with minimal distortion and offers fast, non-transitioning frequency changes.

Important Technical Specifications

Waveform Characteristics:

• Waveforms: Sine-wave, TTL level square wave.
• Amplitude Resolution: 10-bit.
• Sine Wave Harmonic Distortion: -40dBc (frequency < 1MHz), -30dBc (frequency ≥ 1MHz).
• Sine Wave THD: <1% (high resistance, 1KHz).
• TTL Level Square Wave Rise Time: ≤20ns.
• Square Wave Overshoot: ≤5%.

Frequency Characteristics:

• Frequency Range: 1Hz – 3MHz.
• Resolution: 0.01Hz (less than 1MHz), 0.1Hz (1MHz and more than 1MHz).
• Frequency Tolerance: ≤ ± (5 × 10⁻⁵ + 30Hz + 1d).
• Frequency Stability: ≤ ±50ppm (-40℃ to +85°C), utilizing a low temperature drift crystal oscillator with PLL phase-lock circuit. Custom options for stability ≤ ±20ppm are available.

Amplitude Characteristics:

• Amplitude Range: 10mVp-p – 16Vp-p (high resistance), 5mVp-p – 8Vp-p (50Ω).
• Display: 3 digits.
• Amplitude Error: ≤ ±(5% + 100 mVp-p) (high resistance, 1KHz, 1-16Vp-p).
• Amplitude Stability: ≤ ±5% (1hr, high resistance, 1KHz, 16Vp-p).
• Flatness:
  • ≤ ±0.5dB (≤100KHz)
  • ≤ ±0.8dB (100KHz-1MHz)
  • ≤ ±2dB (1MHz-2MHz)
  • ≤ ±3dB (2MHz-3MHz)
  • (Unstable below 1Hz)
• Output Impedance: 50Ω (±10%).
• TTL Level Output Characteristic: Low level: <0.3V; High level: >4.2V (high resistance).

Drift Characteristics:

• Drift Range: 0V – ±6.4V (high resistance), 0V – ±3.2V (50Ω).
• Resolution: 50mV (high resistance).
• Drift Error: ≤ ± (5% + 100mV) (1hr, high resistance, 1KHz, 10Vp-p).

Modulation Characteristics:

• Amplitude Modulation (AM).
• Modulate Waveform (Interior AM): Sine wave: 400Hz ±10%, 1000Hz ±10% (2 ranges).
• Modulation Depth: 1% – 100%.
• Modulation Source: Inner modulation source, outer modulation source.
• Outer Modulation Characteristic: Input impedance: 600Ω.
• Input Level: 50% modulation depth at 0dB.
• Input Frequency Response: 100Hz – 100KHz (±3dB).

Sweep Characteristics:

• Sweep Mode: Linearity, logarithm.
• Display during sweep: Frequency and amplitude values displayed synchronously, with the ability to stop at any point.
• Sweep Rate: 0.02s – 5s/step, 5-digit settable.
• Logarithm Sweeping: 100 points per 10 times frequency ranges.

Displaying:

• 8-digit LED display with F, V, AM, SWEEP, MHz, KHz, Hz, %/s indicators and range indicators.

Power Source:

• AC 220V/110V ±10%, frequency: 50Hz/60Hz ±5%.

Ambient Temperature and Humidity:

• 0℃ – 40℃, 30% – 70% RH.

Dimensions:

• 270mm × 215mm × 100mm.

Weight:

• 1.9 kg.

Usage Features

Convenient Keyboard Operation: The front panel features a comprehensive set of keys for various functions:

• Function Keys: F (frequency), V (voltage), MOD (mode), Af (spacing frequency), fo (initial frequency), f1 (terminal frequency), At (time interval), % (modulation depth), RST (reset), EXT (external modulation).
• Navigation and Adjustment Keys: Blinking bit shifts left/right, blink activation, number increase/decrease, positive/negative level DC offset.
• Number Key Area: 15 keys including 0-9, decimal point, backspace (C), and unit keys (MHz/V, KHz/mV, Hz/%/S).

Data Input:

• Digital Input: Input by number keys from right to left. Data exceeding resolution or scope limits will be adjusted to proximal values. Incorrect input can be cleared with "C". Unit input is required to finalize data entry.
• Data Modification: Active a digit with "<>" keys, then use "+" or "-" to increase/decrease the value. Output varies continuously during modification.

Frequency Setting:

• Press "F" to activate frequency setting. Input the desired frequency value and unit. The output signal frequency synchronizes with the display.

Amplitude and DC Offset Setting:

• Press "V" to activate amplitude setting. Input the desired peak-peak voltage. For 50Ω load, the actual output is half the displayed value.
• To set DC offset, press "V" then "+" or "-" to input the polarity and value of the DC voltage. Default DC drift is 0V after power-on or reset.

Mode Setting:

• The "MOD" selector cycles through modes: COMMON, INNER-MODULATION, OUTER-MODULATION, LINEARITY FREQUENCY SWEEP, LOGARITHM FREQUENCY SWEEP.

Common Mode:

• Default mode, only "F" and "V" settings are active.

Inner Modulation Setting:

• Select with "MOD". "AM" indicator lights. Set carrier wave frequency ("F"), output amplitude ("V"), and modulation depth ("%"). Choose between 400Hz ("fo") or 1000Hz ("f₁") modulation signals.

Outer Modulation Setting:

• Select with "MOD". "AM" and "EXT/LOG" indicators light. Input the outer-modulation signal from the "EXT" terminal. Set carrier wave frequency ("F") and output amplitude ("V"). Modulation depth is determined by the outer-modulation signal magnitude (50% at 0dB, 100% at +6dB).

Linearity Frequency Sweep:

• Select with "MOD". "Sweep" indicator lights. Set initial frequency ("fo"), terminal frequency ("f₁"), spacing frequency ("Af"), and sweep time interval ("At"). Sweeping begins after setting "At".

Logarithm Frequency Sweep:

• Select with "MOD". "Sweep" and "EXT/LOG" indicators light. Set initial frequency ("fo"), terminal frequency ("f₁"), and sweep time interval ("At"). Sweeping begins after setting "At". Spacing frequency ("Af") is not used in this mode.

Frequency Sweep Control:

• Pressing "fo", "f₁", "Af", or "At" keys stops sweeping. Press "%/S" to pause (displays pausing frequency) or resume. To restart, press "At" then "%/S".

TTL Level Square Wave Output:

• TTL level square wave is synchronized with sine output and does not require separate range switching.

Default Values:

• After power off or reset, settings revert to default: F=1KHz, V=1V, DC offset=±0.15V, AM modulation frequency=400Hz, AM modulation amplitude m=50%, sweep initial frequency fo=1KHz, sweep terminal frequency f₁=10KHz, sweep interval frequency Af=1KHz, sweep interval time At=1s.

Maintenance Features

Start-up Procedure:

• Verify power voltage/frequency match, set 220V/110V switch, plug in, power on. "2003" model displays, then enters operating mode after 2 seconds. Preheating for 30 minutes is recommended.

Troubleshooting:

• In case of abnormal display or breakdown, press reset key or power off/on to resolve.

DC Component Management:

• If a lower DC is present in the load circuit or a DC component is unnecessary, connect a capacitor with appropriate capacitance and withstand voltage to block DC.

Load Considerations:

• Avoid connecting an oversized load to the TTL level output to prevent waveform distortion and long rising times.

Environmental Precautions:

• Do not expose the instrument to extreme temperatures, humidity, dust, strong radiance, or electromagnetic interference. Avoid violent shocks.

Disclaimer:

• Specifications are subject to change without notice.
• The manual's content is considered correct; contact the manufacturer for any errors or doubts.
• The manufacturer is not responsible for accidents or injuries due to improper operation.
• The described functions do not imply special usage.

Victor VC2003 Specifications