5MHz FUNCTION GENERATOR

MODEL GF-8056

User’s Manual

Elenco

TM

Electronics, Inc.

Copyright © 2004 by Elenco TM Electronics, Inc. All rights reserved.

No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.

753117

NOTICE BEFORE OPERATION

1. Unpack the instrument:

After receiving the instrument, immediately unpack and inspect it for any damage which might have occured during transportation or shortage of accessories. If any signs of damage and/or shortage of accessories are found, notify the dealer immediately.

2. Environments:

Normal operating temperature of the instrument is 10°C to 40°C (50°F to 104°F). Operation of the instrument outside of this temperature range may cause damage to the circuits.

Do not use the instrument in a place where strong magnetic or electric fields exist.

Such fields may disturb the measurement.

3. Check the Line Voltage:

The instrument can operate on any one of the line voltages shown in the table below by inserting the line voltage selector plug in the corresponding position on the rear panel.

Before connecting the power plug to an AC line outlet, be sure to check that voltage selector plug is set in the correct position corresponding to the line voltage.

!

CAUTION: The instrument may not properly operate or may be damaged if it is connected to an AC line with the wrong voltage. When line voltages are changed, replacement of the fuses is also required.

Selector

115V

230V

Line Voltage

100~125V 50/60Hz

220~240V 50/60Hz

Fuse

600mA

300mA

Hints for operating the instrument:

Observe the following suggestions for successful instrument operation.

1. Never place heavy objects on the instrument.

2. Never place a hot soldering iron on or near the instrument.

3. Never insert wires, pins or other metal objects into the ventilation fan.

4. Never move or pull the instrument with power cord or probe cord.

Never move the instrument especially when the power cord or signal probe is connected to a circuit.

5. If the instrument is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

!

WARNING: The following precautions must be observed to help prevent electric shock.

1. When the instrument is used for testing, there is always a certain amount of danger from electrical shock. The person using the instrument should be a qualified electronics technician or otherwise trained and qualified to work in such circumstance.

2. Do not operate the instrument with the cover removed unless you are a qualified service technician.

3. The ground wire of the 3-wire AC power plug places the chassis and housing of the instrument at earth ground. Use only a 3-wire outlet, and do not attempt to defeat the ground wire connection or float the instrument. Doing so may pose a great safety hazard.

4. Do not obstruct the ventilation holes in the rear panel, as this will increase the internal temperature.

5. Never apply an external voltage to the output

BNC connector of the instrument.

6. Excessive voltage applied to the input BNC connector may damage the instrument.

-1-

GENERAL

DESCRIPTION

The GF-8056 is a deluxe function generator combined with a 5-digit, high-resolution 60MHz counter.

The GF-8056 is a rugged, easy-tooperate, excellent heat dissipating and high stability instrument.

The GF-8056 is a 4-in-1 instrument. It can be used as the following described four kinds of electronic instruments respectively:

1. As a Function Generator:

Eight waveforms selected by a rotary switch instead of push-button to prevent accidental touching or bad connections. Maximum output

20Vp-p (no load) and minimum output 0.1Vp-p

(no load).

2. As a Pulse Generator:

The GF-8056 provides positive pulse and reverse negative pulse output with the Pull Reverse

Switch, maximum output 20Vp-p (no load).

Frequency display by the LED, pulse width from

0.4sec to 100ns. Can meet most audio, video and other basic electronic application requirements.

3. As a Sweep Generator:

The GF-8056 provides linear sweep or log sweep. Use the selection switch to select the sweep mode. Maximum sweep width 1:100 and sweep speed 5sec to 10ms. Also, the GF-8056 provides VCF input and synchronous output function. Easy-to-operate.

4. As a Counter:

The GF-8056 is a 5-digit, micro-controlled counter. The GF-8056 features auto-range, autogate time and high-resolution - 0.001Hz, input impedance - 1M

Ω

, bandwidth - 0.2Hz~60MHz, voltage resistance - 150Vp-p. Other features the

GF-8056 provides: adjustable trigger +2.5V with

LED indication. Display unit auto-indicate, HF /

LF selector, 100kHz filter.

5. As a DC Voltage:

The GF-8056 provides a DC output function. The output voltage can be adjusted from +10V to –10.

It can be used as a low-power DC source.

SPECIFICATIONS

1. General Specifications:

A. Generator

Frequency: 0.05Hz~5MHz, display on 5-digit

LED display, maximum resolution

0.001Hz in 8 ranges.

Waveform output: Sine, square, triangle, positive, ramp, negative ramp, positive pulse and negative pulse, DC, 8 waveforms.

Stability: 0.1%~15 minutes after switch “ON”

0.2%~24 hrs. after switch “ON”

DC offset: +10V (no load), +5V (50

Ω load), continuously adjustable, controlled by an offset switch.

B. Counter

Display: 5 digits 0.36” red LED

Max. resolution: 0.001Hz

Display unit: Hz/kHz automatically controlled by CPU

-2-

C. Common Specification

Operating temperature: 0°C~40°C,

10%~80% R.H.

Storage temperature: –20°C~70°C,

0%~90% R.H.

Power source: AC 115V (+10%) 50/60Hz,

FUSE: 600mA AC 230V

(+10%) 50/60Hz,

FUSE: 300mA

Power consumption: 25W

Ventilation: DC 12V / 100mA fan

Dimensions: 275 x 90 x 300mm

Weight: 2.5 kgs. net.

Accessory: Power cord, operation manual

2. Triangle Wave:

Frequency: 0.05Hz~5MHz

Symmetry: 50% (rise wave) to 50% (fall wave), < 1%, 1Hz~100kHz

Linearity: < 1%, (1Hz~100kHz)

SPECIFICATIONS (continued)

3. Sine Wave:

Frequency: 0.05Hz~5MHz

Distortion: < 1%, 1Hz~100kHz

Harmonic ratio: < 30dB, 100kHz~5MHz

Frequency response: < 0.1dB, up to 100kHz

< 1.5dB, 100kHz to 5MHz

4. Square Wave:

Frequency: 0.05Hz~5MHz

Symmetry: 50% (positive half) to 50% (negative half). < 1%, 1Hz~100kHz

Rise time: < 90ns (20Vp-p , no load)

5. Ramp Wave:

Frequency: 0.05Hz~4.5MHz, 8 range selected by rotary switch

Symmetry: 90% (rise wave) to 10% (fall wave), continuously adjustable

Linearity: < 1%, (0.1Hz~100kHz)

6. Positive Pulse:

Frequency: 0.05Hz~4.5MHz

Width: 0.4sec~100ns, continuously adjustable

Symmetry: 1:1 to 10:1 continuously adjustable

1Hz~100kHz

Reverse: Pull the Rev. switch, the output will become a negative pulse

7. DC:

Output voltage: +10V to –10V continuously adjustable by OFFSET switch

8. Main Output:

Output impedance: 50

Ω

, < 2%

Max. output: 20Vp-p (no load), +1Vp-p

10Vp-p (50

Ω load) +0.5V

Min. output: 0.1Vp-p (no load), or 0.05Vp-p (50

Ω load)

Attenuator: One –26dB (1/20) attenuator,

< 2% accuracy

9. Synchonous Output:

Output impedance: 50

Ω

, < 2% accuracy

Output level: TTL level, > 3Vp-p fixed amplitude

Fan out: >20

Rise time: <60nS

-3-

10. V.C.F. Input:

Input impedance: 0~10V

Input frequency: DC~1kHz variable 1:1 to 1:100

11. Sweep Synchronous Output:

Output impedance: 1k

Ω

, < 2%

Output waveform: Linear or log sweep ramp wave

Output amplitude: 10Vp-p (no load) or

5Vp-p (1k

Ω load)

Output frequency: 0.2Hz~100Hz continuously adjustable

12. Sweep Generator:

Sweep form: Linear or log switchable

Sweep speed: 5sec~10ms, continuously adjustable

Sweep width: 1:1~1:100

13. Counter:

Display: 5 digits, 0.36” red LED display

Max. Resolution: 0.001Hz

Display unit: Hz / kHz autorange

Time base: 20MHz

Temperature coefficient: < 20ppm / °C

Accuracy: <0.02% +1 digit

Power supply: +5V, 160mA

Internal Counter:

Range: Autorange with 4 resolution,

0.001Hz / 0.01Hz / 0.001kHz /

0.01kHz, auto-controlled by CPU

Display: 0.500Hz~5000.0kHz auto-select by

CPU

Gate time: Variable, 0.25sec~5sec, auto-setting

Min. display digits: 4 digits

External Counter:

Max. input voltage: < 150Vrms

Input impedance: 1M

Ω

, < 2%

Input frequency: 0.2Hz ~60MHz

Coupling: HF - 100kHz and greater

LF - 100kHz and lower

Min. display digits: 4 digits

Gate time: 0.25sec~10sec, auto-setting depends on the input frequency

Sensitivity: > 30mVrms (1MHz)

FRONT PANEL DESCRIPTION

14 13 12 11 10 9 8 7

15

6

5

1 2 16 17 18 19 4 3

1. Power Switch: Pushing the switch “ON” will light the LED digits (14) to indicate power “ON”.

2. Frequency: Turn the switch to set the desired frequency generated. This knob is for micro-adjust.

3. Synchronous Output: TTL level square wave signal.

Output frequency as MAIN output.

4. Sweep Output: Sweep signal output BNC.

It will operate individually whether the instrument set to sweep mode operation or not, output impedance of 1k

Ω

, output amplitude 10Vp-p, output signal: Linear or Log.

5. Main Output: Waveform selected by Function switch. Max.

output impedance 50

Ω

.

Max. amplitude

20Vp-p (no load).

6. Amplitude: Turn switch to adjust the amplitude of the output signal.

Pull out the switch to attenuate the output 20 times (or –26dB).

7. DC Offset: The switch is set to OFF position in normal operation. When used for BIAS circuit, pull “ON” the switch and turn to adjust DC offset voltage.

8. Sweep Rate: Rotate switch to adjust the sweep rate from 5sec to 10mS at the Sweep Output (4). Pull switch to synchronous output signals from (4) and (5).

9. Sweep Width: The switch is operational only when switch

(8) is set to “ON”. Rotate the switch to adjust the sweep width.

In the normal position

(switch in), the unit is set to “Linear Sweep”.

Pull the switch out for the “ON” position, set the unit to “Log Sweep”.

10. Function Wave Selector: Rotate switch to select between four output waveforms: sine, triangle, square, and DC.

11. Frequency Range: Selects output frequency range by rotating switch.

The frequency displayed on (14) will be the product of the selected digits by (2) and (11).

The frequency will be 10 times difference on each step. Four ranges: x1, x10, x100, x1000.

-4-

12. Hz: The lit LED indicates the display units are “Hz”.

13. kHz: The lit LED indicates the display units are “kHz”.

14. LED Digits: 5 digits indicates the frequency generated or the EXT input. The units will be indicated by

(12) or (13) selected by CPU automatically.

15. EXT. Counter: The red LED indicates Ext. counter condition.

LED lit - trigger level too high.

LED dark - trigger level too low.

LED flashing - triggering state.

16. Display: Selects the source of the frequency displayed by

(14).

INT Hz / kHz - Display the frequency of the signal generated by the GF-8056.

EXT HF - Display the external input high frequency signal. This position filters out the DC signal and low frequency harmonic signal. Inputs only the expected high frequency signal.

EXT LF - 100kHz Filter - Display the external input low frequency signal.

Set to this position filters out the signal higher than 100kHz making the low frequency signal more stable.

17. RAMP / PULSE: Rotate switch to generate a RAMP wave from a Triangle wave and a PULSE wave from a Square wave. Pull switch out to Invert position, output will be negative Ramp and negative Pulse.

18. EXT Input: External signal input BNC.

The input frequency is 0.2Hz to 60MHz, max. input voltage 150Vrms [when (17) is at “PULL” position].

19. V.C.F. Input: External input DC signal to control the frequency generated.

External input AC sweep signal to make it external sweep.

External input AC sine wave to make it external FM modulation.

Input signal 0~10V, < 1kHz.

Input impedance - 1k Ω .

OPERATING INSTRUCTIONS

WARNING: Before applying power to your GF-8056, make sure that the input voltage setting is correct for your power source.

CAUTION: All the knobs are set to “PUSH” position on operation if not special marked to be set at “PULL”.

(A) Function Generator and Inspection

4 5 7

6

1 3 2

1. Turn on the power switch and make sure the

LED’s of the 5-digit display light.

2. Connect MAIN OUTPUT BNC of the GF-8056 to

CH1 input BNC of your Oscilloscope, and the

SYNC OUTPUT BNC to CH2. Set the trigger source of your oscilloscope to CH2.

3. Turn the FREQUENCY knob from x0.05~x5.0

The GF-8056 display and oscilloscope will be changed slightly on each step.

4. Turn the RANGE knob from x1~x1000. You will find the 5-digit LED display value will change 10 times on each step and the oscilloscope too.

When the switch (7) is set at Hz or kHz, the display value will be changed to x1 or x1000.

5. Turn the FUNCTION knob to select the waveform output to CH1 of your Oscilloscope. CH2 will be

TTL square wave only.

6. Turn the AMPLITUDE knob to adjust the amplitude of the signal output to CH1. When you

“PULL” out the switch, the amplitude will be reduced 20 times (–20dB), but the display of CH2

(sync output signal) will be unchanged.

7. Turn the OFFSET knob. You will find that CH1 and CH2 will not change. This switch will operate only in the “PULL” position. PULL out the offset switch and turn it to set DC offset voltage (from

+10V to –10V) of the main output signal. Note that the SYNC output signal will be not affected.

Note: When the offset voltage is higher than the wave (+ or –), the display waveform will be cut OFF.

-5-

(B) Sweep Generator

7 6 5 4

6

1 8 3 2

1. Turn on the power switch and make sure the

LED’s of the 5-digit display light.

2. Connect the main OUTPUT BNC to the CH1 input BNC of your oscilloscope.

3. Connect the SWEEP OUTPUT BNC to the CH2 input BNC of your oscilloscope and set the trigger source of the oscilloscope at CH2.

4. Turn the SWEEP RATE knob.

CH2 of the oscilloscope will display a linear sawtooth wave and the frequency will be variable from 5sec to

10mS by turning the switch. CH1 will display the wave according to the FUNCTION switch position. PULL out the switch to set “SWEEP

ON”. The display of CH2 will be unchanged and the display frequency will be varied by turning the knobs. Note that the display of CH1 will be a sweep wave, and the speed will depend on the sweep rate.

NOTE: After “PULL SWEEP ON”, the trigger source of the oscilloscope must be changed from

CH2 to CH1.

5. Turn the SWEEP WIDTH knob to adjust the sweep width display on CH1.

NOTE: Be sure that the SWEEP RATE SWITCH was at the “PULL” position. When pulling out the sweep width switch, the sweep mode will change from linear to log sweep. The waveform display of

CH1 will become log form.

6. The AMPLITUDE and FUNCTION knobs will operate as a generator.

7. The frequency shown on the 5-digit LED display is the generator’s before “PULL SWEEP ON”.

This frequency will be the start frequency. After

“PULL SWEEP ON”, the sweep condition, including frequency, waveform, sweep mode, etc., will be observed from the CRT of the oscilloscope.

The 5-digit LED display will continuously vary.

8. V.C.F. INPUT - Set the sweep rate switch at the

“PUSH” position to set the GF-8056 at normal generator mode. Connect the sweep output BNC to V.C.F. INPUT BNC and check the waveform displayed on CH1 of the scope. The waveform displayed should be the sweep wave.

When inputting a sine wave from another generator to the V.C.F. INPUT to observe the FM display, be sure the frequency of the basic wave (GF-8056) is higher than the external input signal.

-6-

(C) Pulse Wave Generator

5 4 9

8

1 6 3 2

1. Turn on the power switch and make sure the

LED’s of the 5-digit display light.

2. Connect the MAIN OUTPUT BNC to CH1.

3. Connect the SYNC OUTPUT BNC to CH2 and set the trigger source of the oscilloscope on CH2.

4. Set the FUNCTION knob to the square wave position ( ) and turn the knob (6) until the display becomes the pulse waveform you want.

5. Set the FREQUENCY and RANGE to the desired frequency.

6. Set the pulse width by adjusting the knob (6).

7. Pull the knob (6) to display the negative pulse position.

8. Turn the AMPLITUDE knob to adjust the amplitude of the signal output from the main output BNC (2). The signal will be –26dB when you “PULL” out the switch. But the signal output from the “SYNC” output BNC (3) will not be affected by this switch. The output signal of the

“SYNC” output will keep at a TTL level.

9. Set the DC offset voltage by pulling out the

“OFFSET” switch. Turn switch to adjust the DC offset voltage from +10V to –10V.

-7-

(D) Frequency Counter

2

3

1 4 3

1. Turn on the power switch and make sure the

LED’s of the 5-digit display light.

2. DISPLAY: The coupling provides 4 steps.

(a). INT/Hz: To use the internal counter from

0.05Hz to 5kHz.

(b). INT/kHz: To use the internal counter from

0.5kHz to 5MHz.

(c). EXT HF: To use the external counter for high frequency (100kHz to

60MHz).

(d). EXT LF: To use the external counter for low frequency (0.2Hz to

100kHz).

3. Connect the EXT INPUT BNC to the external signal source, the EXT LED lights.

4. Display unit: The display unit of the GF-8056 will be on Hz or kHz automatically controlled by CPU.

-8-

-9-

-10-

Elenco

TM

Electronics, Inc.

150 W. Carpenter Avenue

Wheeling, IL 60090

(847) 541-3800

Website: www.elenco.com

e-mail: [email protected]