Global Specialties PURE WAVE PW-2102 User manual

Function Generator Series
Operations Manual
PW-2102 • PW-2105 • PW-2110 • PW-2120
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GLOBAl Sl 'LCU't TIES
INSTRUMENTS

©Copyright 1999 lnterplex Electronics, Inc.
All rights reserved. No part of this book shall be reproduced, stored in a retrieval
system, or transmitted by any means, electronic, mechanical, photocopying, re-
cording, or otherwise, without written permission from the publisher.
No patent
liability is assumed with respect to the use of the information contained herein.
While every precaution has been taken
in the preparation of this book, the pub-
lisher assumes no responsibility for errors or omissions. Neither
is any liability
assumed for damages resulting from the use of the information contained herein.
Printed in the United States of America.
GLOBAL SPECIAL77ES
1486 HIGHLAND AVENUE
.TM
CHESHIRE, CT 06410
an lnterp/ex
www. g Io ba Is pee ia Iti es. corn /Jndustries company

Table of Contents
Specification for 20 MHz Function Generator........................................................................2
Controls
and Indicators .........................................................................................................4
Front Panel .................................................................................................................4
Back Panel.................................................................................................................. 7
Operating Instructions ...........................................................................................................8
Frequency Selection ...................................................................................................8
Output LevelAdjustment ............................................................................................9
Waveform Selection....................................................................................................9
Duty Cycle Adjustmentand Obtaining Ramp
and Pulse Waveforms ......................... 9
DC OffsetAdjustment............................................................................................... 10
CMOS Level Adjustment .......................................................................................... 10
External Counter....................................................................................................... 10
Modulation Modes .................................................................................................... 12
Voltage Controlled Frequency Operation ....................................................... 12
AM Operation................................................................................................. 13
FM Operation ................................................................................................. 14
Burst Operation.............................................................................................. 16
Sweep Operation ........................................................................................... 17
DC Offset Compensation ....................................................................................................
18
Settings Storage.................................................................................................................. 19
Data Communications .........................................................................................................20

Specifications
1. Frequency Characteristics
Waveforms sine, triangle, square, +1- pulse, +1- ramp
Range 0.2 Hz to
20 MHz in 8 ranges
Resolution 5 digits
Frequency stability +1 - 0.01% for ranges 20 Hz to 20 MHz, +1 - 0.1% for range
2Hz (excluding VCG, FM modulation, manual sweep, stop
sweep frequency setting and external counter modes)
Tuning range coarse and fine 0.09
to 1.1 times of the selected range, fine
1/1 Oath of coarse setting speed
Variable duty cycle 15% to 85% continuously variable
Operating modes normal, sweep, VCG, AM, FM, burst
2. Output Characteristics
Impedance 50 Q ±1 0%
Amplitude Level 20 V p-p open circuit, 10 V p-p into
50 Q variable
DC offset Preset ±0.1 V
3. Sine Wave
Distortion
Flatness
4. Square Wave
Symmetry
Rise time
5. Triangle Wave
Linearity
6. TTL Output
Level
Rise time
7. CMOS Output
Max. frequency
Level
Rise time
Auto + negative peak of waveform 0 V ±
Auto- 0.1V
Variable positive peak of waveform 0 V
±0.1 V
±1 0 V open circuit, ±5 V into 50 Q
Signal plus offset not to exceed 1 OV
<1% (at 1 kHz, duty cycle 50%)
±5% (.45 dB) at 10 Hz to 10 MHz,
±10% (1.0 dB) at 10 MHz to 20 MHz
±3% (at 0.2
Hz to 100kHz)
<20 ns
>98% (at 0.2 Hz to
100kHz)
0.8 V to 2.4 V
<20 ns
2 MHz
0-4V to 0-14 V continuously variable
<120 ns
8.
VCG (Voltage Controlled Generator) Input
Input voltage 0 to 10 V ±IV , 0-10 V causes a 1 to tOO frequency change
Impedance 10 k ±5%
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9. Sweep Operation
Mode Linear or logarithmic
Width 1 to 100 continuously variable
Rate
Sweep output
Start/stop
20 ms to 30 s continuously variable.
0-2V
Adjustable
10. Amplitude Modulation Characteristics
Source Internal or external
Modulation depth 0 to 100 %
Internal modulation 1 to 15kHz
modulation DC 500 kHz
External sensitivity 1
0 V p-p for 100%
11. Frequency Modulation Characteristics
Internal or
0 to 5%
1 15
DC kHz
carrier signal
modulation
modulation
sensitivity 10 V p-p for 5% deviation
or
than
V)
Continuously variable from 1 ms to burst repetition time
minus 1 ms
50
as main frequency
Always integer number starting finishing at zero
0 ±
5 digit
5 to
0.005% automatically switched
on input frequency
mV rms.
mm
1 MQ 1 5 at output V
Square Divide by 10 or 100
Auxiliary square wave outputs i/1 Oth and 1/1 OOth of the main frequency-
GLOBAL SPECIALTIES
INSTHUMENTS

Front Panel
The generator's front panel is shown in Figure 1.
14
13
15
16
1-3.
4-6.
32 33 2 1 3 4 5
23 24 25 26
27 28 29 30 34 35 36
17 18
19 21 22
Figure 1: Front Panel.
Frequency Group
6
37 38 39
9
10
31
8
4
12
11
1 ,2. FREQUENCY RANGE selection keys. The selected range is indicated by the LED
indicators (3).
3. FREQUENCY RANGE LED indicators. 8 LED indicators determine maximum frequency
of each range -20 MHz, 2 MHz, 200 kHz,
20 kHz, 2 kHz, 200 Hz, 20 Hz, 2 Hz.
Mode Group
4,5. MODE selection keys. Selects one of six available operating modes.
6. MODE LED indicators. There are 6 LED indicators- FREQUENCY, OUTPUT LEVEL,
DUTY CYCLE,
DC OFFSET, CMOS LEVEL, EXT CNTR. The lighted LED indi-
cates the parameter, which value
is being displayed (33), and can be adjusted by
rotation of the tuning knob (31).
7. FINE ADJUST
key. Switches on/off fine adjustment of frequency, burst repetition
rate, tone burst time and sweep time.
Note: The FINE ADJUST key (7) has three additional functions -see Output
Level Adjustment (page 9, item 4), Sweep Operation (page 18, item 19) and DC
Offset Compensation (page 19).
8. FINE ADJUST LED indicator. When the LED indicator (8) is on, rotation of the
tuning knob (31) causes fine adjustment of the above mentioned parameters, oth-
erwise -coarse adjustment prevails.
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DC Offset Group
9. DC OFFSET key. Selects one of three possible preset values of DC offset.
10. DC OFFSET LED indicators. There are 3 LED indicators -PRESET, AUTO+, and
AUTO- that indicate the preset value selected by the DC OFFSET key (9). When
the PRESET LED indicator is on, the DC offset is set to zero. When AUTO+ LED
indicator is on, the DC offset
is set to be equal to output level value, and when
AUTO- LED indicator is on, the DC offset is set to be equal to minus the output level
value.
Waveform Group
11. WAVEFORM key. Selects sine, triangle or square waveforms at the 50Q output
jack (37).
12. WAVEFORM LED indicators. There are 3 LED indicators -SINE, TRIANGLE,
SQUARE, which indicate the selected waveform.
Modulation Group
13. ON/OFF key. Switches modulation on/off. Modulation is on when lit.
14. ON/OFF LED indicator. When the LED indicator (14) is on, modulation mode shown
by the LED indicator (16)
is on. Otherwise all LED indicators (16), (18), (20) and
(22) are off and keys (15), (17), (19) and (21) will be disabled.
15. MODULATION MODE key. Selects one of four possible modulation modes.
Modulation must be on to enable.
16. MODULATION MODE LED indicators. There are 4 LED indicators- VCG, AM,
FM, BURST, which indicate the selected modulation mode.
17. REPETITION RATE key. Enables adjustment of the repetition rate of the internal
signal
in the burst gate in the burst modulation mode. Enables adjustment of the
frequency of the internal modulating signal for AM/FM modulation modes.
18. REPETITION RATE LED indicator. When the LED indicator (18) is on and internal
BURST mode is selected, the repetition period value in milliseconds is displayed
(33) and can be adjusted by rotation of the tuning knob (31 ). When the LED indica-
tor (18)
is on and internal AM or FM mode is selected, the frequency of internal
modulating signal
is displayed (33) and can be adjusted by rotation of the tuning
knob
(31 ).
19. % key. Enables the percentage of internal AM/FM modulation or the duty cycle of
internal burst gate adjustment- according to the selected modulation mode (AM,
FM or BURST). Enabled only if the ON/OFF LED indicator (14) is on and the
EXTERNAL LED indicator (22)
is off.
20. % LED indicator. When the LED indicator (20) is on, and internal AM or FM or
BURST mode
is selected, the AM or FM modulation percentage or the duty cycle of
burst modulation is displayed (33), and can be adjusted by rotating of the tuning
knob
(31 ).
21. EXTERNAL key. Selects whether modulation is from an internal source or from a
signal applied to the VCG MOD input jack (34) (for AM or FM modulation), or from
BURST input jack (35) (for burst modulation mode). Enabled only if the LED indi-
cator (14)
is on and the VCG LED indicator (16) is off.
22. EXTERNAL LED indicator. When the LED indicator (22) is on, the modulating
source will be a signal applied to the VCG MOD input jack (34) (for VCG, AM or FM
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modulation) or to the BURST input jack (35) (for burst modulation mode). Other-
wise the modulating source will be an internal signal. If VCG modulation mode is
selected, the LED indicator (22) is always on.
Sweep Group
23. RUN key. Switches sweep modes between Normal Sweep, Manual Sweep, and
Sweep off.
24. RUN/MAN LED indicators. Indicate the sweep mode, selected by the RUN key. If
the RUN and MAN LED indicators (24) are both off, the sweep mode is off. If the
RUN LED indicator (24) is on
-the generator sweeps between the start and stop
frequencies. If the MAN LED indicator (24) is on, some intermediate frequency will
be continuously present at the output with its value fixed
on the specific value the
moment the RUN key is pressed.
The frequency value will be displayed (33) and
can be adjusted in the range between the start and stop frequencies by rotation of
the tuning knob
(31 ).
25. SWEEP RANGE key. Enables the adjustment of the sweep start and/or stop fre-
quencies. This switch also switches sweep or modulation on and off.
26. START/STOP LED indicators. Indicates whether sweep start or stop is enabled.
Start or stop frequencies can be adjusted by rotating tuning knob (31 ).
27. TIME key. Enables sweep time adjustment.
28. TIME LED indicator. When the LED indicator (28) is on, the value of sweep time
is
displayed in milliseconds and can be adjusted by rotating the tuning knob (31 ).
29. SWEEP MODE key. Selects linear or logarithmic sweep operation.
30. LIN/LOG LED indicators. Indicates sweep mode of operation.
31. TUNING KNOB. Adjusts the parameterselected by one of the following keys listed
below:
32.
33.
• MODE (4, 5)
• REPETITION RATE (17)
• % (19)
• SWEEP RANGE (25)
• TIME (27)
Clockwise rotation ofthe tuning knob changes the selected parameterfrom its mini-
mum to maximum value, and vice versa for counter-clockwise rotation. Units of
measure, excluding volts, are indicated by the UNITS of MEASURE LED indicators
(32).
UNITS of MEASURE LED indicators. There are 4 LEOs, which indicate the units
of measure corresponding to the operation mode selected.
DISPLAY. Displays the appropriate numerical value corresponding to the param-
eter selected by one of the keys listed below: MODE (4,5), REPETITION RATE
(17), % (19), SWEEP RANGE (25), TIME (27). When frequency
is displayed, the
value is updated every 0.5s.
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