FUNCTION GENERATORS & WAVEFORM SYNTHESIZERS
148
Multi-function Synthesizer
HP 8904A
• Sine to 600 kHz, square, ramp, triangle to 50 kHz
• 12-bit direct digital synthesis
• Tone, DTMF, digital, Hop Ram sequence modes
• One or two outputs
3
HP 8904A 1 2
HP 8904A Function Synthesizer
The standard HP 8904A multi-function synthesizer generates accurate
sine waves from 0 Hz to 600 kHz with 0.1 Hz resolution. The HP 8904A
also has five other standard functions: square, triangle, ramp, from 0 Hz
to 50 kHz plus dc, and Gaussian white noise. All waveform values in the
HP 8904A are digitally calculated in real time by Hewlett-Packard’s
Digital Waveform Synthesis IC yielding 12-bit digital accuracy. Full
HP-IB programmability is also included standard on the HP 8904A.
• One to four internal channels
• AM, FM, ØM, DSBSC, and pulse modulation
• Unit-to-unit phase synchronization
• Optional 600 Ωhigh power, balanced output
Fast Hop
Option 003 adds the ability to externally hop channel A in frequency,
phase, or amplitude. Up to 16 frequency/phase/amplitude states can be
entered into the Hop Ram memory. To hop, an external device must
address the four-bit wide, TTL-level address bus provided on the rear
panel. Phase continuous switching can be done in as little as 20 µs.
Unit-to-Unit Phase Synchronization
With Option 005, multiple HP 8904A’s can be phase synchronized to provide more than two phase-related outputs. In the synchronous mode, one
unit is specified to be the master clock unit and all others are designated
slaves. Two signals are then routed from the clock master unit to all slave
units through external low-loss power splitters. To synchronize the units,
a phase reset command is given to the master HP 8904A via HP-IB or
from the front panel. The total phase error between units will be the larger of ± 0.1 degree or 60 ns for frequencies from 0.1 Hz to 100 kHz. Up to
eight HP 8904A’s may be synchronized.
600 Ω Balanced Output
Option 006 changes output 1 from a 50 Ωelectronically-floating output to
a transformer-coupled, 600 Ω-balanced output. Option 006 provides high
power, balanced signals into 600 Ω loads. Maximum output is 10 volts
rms into 600 Ω. The Option 006 output restricts the frequency range of
output 1 to 30 Hz to 100 kHz. In addition, complex waveforms such as
square, ramp, and triangle waveforms are degraded and dc cannot be
passed through the Option 006 output. In many applications, however,
the HP 8904A Option 006 is a direct replacement for the HP 200CD wide
range oscillator.
Two Outputs
Option 002 adds a second, identical synthesizer and floating 50 Ωoutput
section to the HP 8904A. Frequency, amplitude, waveform, and phase can
be independently set for the two sources. Either synthesizer can be precisely varied in phase relative to each other from 0 degrees to 359.9
degrees with a resolution of 0.1 degree.
Complex Signal Generation
Option 001 adds internal synthesizers (for a total of four) which can modulate channel A or be summed to give complex waveform generating
capabilities to the HP 8904A. All four synthesizers are independent with
precise phase offset capabilities. These synthesizers can be digitally
summed before being output. In addition to summing, Option 001 allows
channels B, C, and D to modulate channel A with AM, FM, ØM, DSBSC,
or pulse modulation.
FM Stereo Composite Mode
Option 001 also includes a mode for generating FM stereo composite signals. Test signals in this mode include Left = Right, Left = – Right, Left
Only, and Right Only. Single keystrokes select test-tone frequency, composite level, test signal mode, and pilot tone level. Stereo separation is
typically greater than 65 dB.
Communication Signaling
Option 001 also adds four sequence modes to the HP 8904A: tone,
DTMF, digital, and Hop Ram sequence modes. These modes make the
HP 8904A a powerful tool for use in communications signaling. Tone and
DTMF modes allow creation of single or dual tone sequences up to 750
states in length. Digital sequence mode can generate bit streams up to
3000 bits in length with 100 µs resolution. Hop Ram sequence mode
allows sequencing of 16 tones, each with an associated amplitude, frequency, and phase value.
HP 8904A Specifications (for 50 Ωoutput only)
Frequency
Range:Sine wave: 0 Hz to 600 kHz
Square, triangle, ramp: 0 Hz to 50 kHz
Resolution: 0.1 Hz
Accuracy (internal 10 MHz timebase): 50 ppm
AC Amplitude (sine wave only)
Range:0 to 10 V p-p into a 50 Ω load
Accuracy (> 40 mV p-p into 50 Ω):1%, 0.1 Hz to 100 kHz;
3%, 100 kHz to 600 kHz
Flatness: (> 630 mV p-p into 50 Ω): ±0.1% (± 0.009 dB),
0.1 Hz to 100 kHz
DC Amplitude
Range:0 to ±10 V p-p open circuit
Accuracy:Larger of ± 20 mV or ± 2.1%
Spectral Purity (sine wave only)
THD + N (including spurs, amplitude > 50 mV rms into 50 Ω):
– 63 dBc rms (0.07%), 20 Hz to 7.5 kHz, 30 kHz BW
– 63 dBc rms (0.07%), 7.5 kHz to 20 kHz, 80 kHz BW
Gaussian Noise
Spectral Characteristic:Equal energy per unit bandwidth (“white’’)
Time-Domain Characteristic:Gaussian distribution
Flatness(>100 mV p-p): Typically ±0.5 dB, 0.1 Hz to 100 kHz
FUNCTION GENERATORS & WAVEFORM SYNTHESIZERS
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Option 001 Specifications
Modulation is for channel A only, and specified for sine-wave carrier and
modulation. External modulation is NOT possible.
Amplitude Modulation (with Option 001)
Rate: 0 to 600 kHz
Depth Range: 0% to 100 % of carrier amplitude
Frequency Modulation (with Option 001)
Rate: 0 to 600 kHz
Deviation Range: 0 to 600 kHz
Phase Modulation (with Option 001)
Rate: 0 to 600 kHz
Deviation Range: 0˚ to 179.9˚/channel
Pulse or DSBSC Modulation (with Option 001)
Rate: 0 Hz to 50 kHz (up to 600 kHz for DSBSC)
Summation (with Option 001)
Two, three, or four channels may be summed.
Channel to Channel Phase Accuracy (equal amplitude sine waves):
Larger of ±0.1˚ or 30 ns, 0.1 Hz to 100 kHz
FM Stereo Composite Mode (with Option 001)
Test Modes: Left = Right, Left = –Right, Left Only, Right Only
Composite Signal Level:Up to 10 V
Pre-Emphasis Modes:Off, 25
Channel Separation:Typically > 65 dB, 20 Hz to 15 kHz rates
into 50 Ω
p-p
µ
s, 50 µs, and 75 µs
Tone Sequence Mode (with Option 001)
Number of Frequencies:16 tones each with user-definable
frequency, on-time and off-time
On/Off Time Duration Range: 0 ms, 0.80 ms to 655.35 ms
Timing Accuracy: ±0.02 ms ( ± 20
Sequence Length: 750 steps, user-definable
µ
s)
DTMF Sequence Mode (with Option 001)
Number of Tone Pairs: 16 standard DTMF tone pairs (0-9, A-D, #, * )
with user-definable on-time and off-time
On/Off Time Duration Range:0 ms, 1.00 ms to 655.35 ms
Timing Accuracy:± 0.02 ms ( ± 20
Sequence Length:750 steps, user-definable
µ
s)
Digital Sequence Mode (with Option 001)
User Definable: On level, off level, and bit period
Bit Period Duration Range: 0.10 ms to 655.35 ms
Timing Accuracy: ±0.02 ms ( ± 20
Sequence Length: Up to 3000 bits, user-definable
µ
s)
Hop Ram Sequence Mode (with Option 001)
Number of Frequencies: 16 tones each with user-definable
frequency, phase, and amplitude
Sequence Clock Frequency Range: 0.1 Hz to 10 kHz
Sequence Length: 750 steps (all 16 tones used) or 3000 steps
(tones 0 and 1 used), user-definable
Option 002 Specifications (50 Ωoutputs)
Output 1 to Output 2 Phase Accuracy (sine waves at the same frequency):
±0.1˚ or 30 ns, 0.1 Hz to 100 kHz, whichever is greater
Option 003 Specifications (Fast Hop)
Direct Hopping of Channel A: 16 phase-frequency-amplitude states may
be addressed with four TTL-compatible inputs
Switching Speed (via digital port):Typically < 20
µ
s
Option 005 Specifications (50 Ωoutputs)
Unit-to-Unit Phase Accuracy (sine waves only):Larger of ± 0.1˚ or 60 ns,
0.1 Hz to 100 kHz
Maximum Number of Synchronized Units: 8 units
Option 006 Specifications (sine wave)
All specifications for the standard 50 Ωoutput HP 8904A are degraded
by the accuracy, flatness, and distortion specifications of the Option 006,
600 Ωtransformer coupled output.
Output Type: Fully floating/balanced transformer-coupled output
Usable Frequency Range: Typically 30 Hz to 200 kHz
AC Amplitude Range: 0 to 10 Vrms into 600 Ω
AC Amplitude Accuracy ( > 40 mVrms into a balanced 600 Ωload):
6% (0.5 dB), 30 Hz to 20 kHz
12% (1.0 dB), 30 Hz to 100 kHz
Flatness (> 40 mVrms into a balanced 600 Ωload): + 0.15 dB, – 0.75 dB,
30 Hz to 100 kHz
THD + Noise (including spurs, > 140 mVrms into a balanced 600 Ωload):
– 63 dB (0.07%), 7.5 kHz to 20 kHz, 80 kHz BW
General
Store Recall: 35 non-volatile registers
Output Type (standard unit):50 Ωelectronic floating or grounded
output, HP-IB programmable
Maximum Float Voltage (50 Ωoutput, signal + float): 10 V peak
maximum from high or low output to chassis ground
External Timebase Input:10 MHz accepted at a nominal level of
0.1 to 5 V peak, automatic switching
Operating Temperature Range:0˚ to 50˚ C
Storage Temperature Range:– 20˚ to 70˚ C
Remote Operation:HP-IB
Size:213 mm W x 133 mm H x 513 mm D (8.36 in x 5.25 in x 20.2 in)
Weight:Net, 5.9 kg (12.8 lb); shipping, 13 kg (28.6 lb)
Ordering Information
HP 8904AMultifunction Synthesizer
Opt 001Adds three (two when ordered with Option 002)
internal channels, Channel A modulation, summation,
FM stereo mode, and sequence capability
Opt 002Adds second internal synthesizer and output
Opt 003Adds fast hop and digital modulation
Opt 004Connectors on rear panel only (not available
with Option 005 or 006)
Opt 005Adds unit to unit phase synchronization
Opt 006Changes output 1 from a 50 Ω output to
a transformer-coupled, 600 Ωbalanced output
Opt 910Provides an additional operation and
calibration manual (08904-90007) and two
service manuals (08904-90008)
Opt 915Adds Service Manual (08904-90008)
Opt W30Extended Repair Service (see page 592)
Opt W32Calibration Service (see page 592)
08904-61024Rack-mount Kit for a single HP 8904A
08904-61025Rack-mount Kit for mounting two
HP 8904A’s side by side
HP 8904A Retrofit Kits (customer retrofittable)
HP 11816A Retrofit Kit for Option 001
HP 11817A Retrofit Kit for Option 002
HP 11818A Retrofit Kit for Option 003
HP 11827A Retrofit Kit for Option 005
HP 11837A Retrofit Kit for Option 006
1
HP-IB cables not included. For description and price see page 75.
2
Not available for units with serial prefix less than 2948A.
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To have a Hewlett-Packard representative help you place an order or to get more information see inside back cover
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