Agilent 8647A Technical Specifications

HP 8647A and 8648A/B/C/D
Signal Generators

®

Technical Specifications

FREQUENCY MODULATION AMPLITUDE

FREQUENCY FUNCTION DATA AMPLITUDE

HP-IB MEMORY MODULATION SOURCE RF OUTPUT

POWER

MOD

IN/OUT

HP 8647A, 250 kHz to 1 GHz
HP 8648A, 100 kHz to 1 GHz
HP 8648B, 9 kHz to 2 GHz
HP 8648C, 9 kHz to 3.2 GHz
HP 8648D, 9 kHz to 4 GHz

Specifications describe warranted instrument performance over the
0 to 50˚C temperature range and after a 30-minute warm-up, unless
otherwise noted. All performance below a carrier frequency of 250 kHz is
typical. Supplemental characteristics are intended to provide information
useful in estimating instrument capability in your application by
describing typical, but non-warranted performance.

Frequency

Range

HP 8647A: 250 kHz to 1000 MHz.
HP 8648A: 100 kHz to 1000 MHz.
HP 8648B: 9 kHz to 2000 MHz.
HP 8648C: 9 kHz to 3200 MHz.
HP 8648D: 9 kHz to 4000 MHz.

1

After one hour warm-up and within one year of calibration.

Resolution

Settable

HP 8647A: 1Hz.
HP 8648A/B/C/D: 0.001 Hz.

Display

10 Hz.

Accuracy

Typically ±3x10–6x carrier frequency (Hz),
±0.15x10

Switching speed (typical)

HP 8647A

<120 ms.

HP 8648A/B/C/D

<1001 MHz: <75 ms.
≥1001 MHz: <100 ms.

1

–6

x carrier frequency (Hz) for Option 1E5.

2

Internal Reference Oscillator

Accuracy and stability

(typical, calibration adjustment dependent)
± Aging rate ± temperature effects ± line voltage effects.

Standard High Stability
Timebase Timebase
(typical) (Opt 1E5)

Aging <±2 ppm/year <±0.1 ppm/year
Temperature <±1 ppm <±0.01 ppm4(typical)

Line Voltage5<±0.5 ppm <±0.1 ppm (typical)

Output

10 MHz, typically >0.5 V

External reference oscillator input

Accepts 2, 5, 10 MHz ±10 ppm typical (±1 ppm
typical with option 1E5) and a level range of 0.5 V
to 2 V

rms

into 50Ω.

2

<±0.0005 ppm/day

level into 50Ω.

rms

3

3

Spectral Purity

Harmonics

<–30 dBc (output ≤+4 dBm).
Subharmonics (output ≤+4 dBm)

<1001 MHz: <–60 dBc.

≤3200 MHz: <–50 dBc.
≤4000 MHz: <–40 dBc.

Nonharmonics (≥5 kHz offset, output ≤+4 dBm)

HP 8647A

<–60 dBc

HP 8648A/B/C/D

<249 MHz: <–55 dBc.
<1001 MHz: <–60 dBc.
<2001 MHz: <–54 dBc.
≤4000 MHz: <–48 dBc.

Residual FM (CCITT, rms)

HP 8647A

<249 MHz: <20 Hz, typically <11 Hz.
<501 MHz: <10 Hz, typically <6 Hz.
≤1000 MHz: <20 Hz, typically <11 Hz.

HP 8648A/B/C/D

<249 MHz: <7 Hz, typically <4 Hz.
<501 MHz: <4 Hz, typically <2 Hz.
<1001 MHz: <7 Hz, typically <4 Hz.
<2001 MHz: <14 Hz, typically <8 Hz.
≤4000 MHz: <28 Hz, typically <12 Hz.

6

.

SSB phase noise (at 20 kHz offset, typical)

HP 8647A

at fc 500 MHz: <–110 dBc/Hz.
at fc 1000 MHz: <–106 dBc/Hz.

HP 8648A/B/C/D

at fc 500 MHz: <–120 dBc/Hz.
at fc 1000 MHz: <–116 dBc/Hz.
at fc 2000 MHz: <–110 dBc/Hz.
at fc 3000 MHz: <–106 dBc/Hz.
at fc 4000 MHz: <–104 dBc/Hz.

Typical Phase Noise of HP 8647A and 8748A/B/C/D at 500 MHz

–50
–60
–70
–80
–90

–100

HP 8648A/B/C/D at 500 MHz

–110
–120
–130
–140
–150

1 10 100 1K 10K 100K 1M 10M

HP 8647A at 500 MHz

(f) dBc/Hz versus Offset from Carrier Frequency (Hz)

Output

Range

HP 8647A and 8648A

+10 to –136 dBm.

HP 8648B/C/D

≤2500 MHz: +13 to –136 dBm.
≤4000 MHz: +10 to –136 dBm.

Maximum Leveled Power (High power option 1EA)

HP8648B/C/D only

≤100 kHz: +17 dBm.
≤1000 MHz: +20 dBm.
≤1500 MHz: +19 dBm.
≤2100 MHz: +17 dBm.
≤2500 MHz: +15 dBm.
≤4000 MHz: +13 dBm.

Option 1EA—Typical Power versus Frequency (GHz)

7

3

Display Resolution

0.1 dB.

Accuracy

HP 8647A

8

±1.5 dB.

HP 8648A/B/C/D

8,9,10

≤2500 MHz: ±1.0 dB.
≤3200 MHz: ±1.5 dB.
≤4000 MHz: ±2.0 dB.

Reverse power protection (watts into 50Ω)
≤2000 MHz: 50 watts.
≤4000 MHz: 25 watts.

SWR (output <–6 dBm, typical)

HP 8647A

<2.0:1.

HP 8648A/B/C/D

<249 kHz: <2.5:1.
<2500 MHz: <1.5:1.
≤4000 MHz: <2.0:1.

Output impedance

Nominally 50 ohms.

Amplitude Modulation (f

>1.5 MHz)

c

11

Range

0 to 100% (output ≤+4 dBm).

Resolution

0.1%.

Accuracy

12

(1 kHz rate).

±5% of setting ±1.5%.

Rates

HP 8647A

Internal: 400 Hz or 1 kHz.
External: 20 Hz to 25 kHz (typical, 3 dB BW).

HP 8648A/B/C/D

Internal: 400 Hz or 1 kHz or 10 Hz to 20 kHz with Opt 1E2.
External: DC: dc to 25 kHz (typical, 3 dB BW).

AC: 1 Hz to 25 kHz (typical, 3 dB BW).

Distortion (1 kHz rate, THD+N, 0.3 to 3 kHz BW)
(at 30 % AM): <2%.
HP 8647A and 8648A (at 90% AM): <3%.
HP 8648B/C/D (at 70% AM): <3%.

Frequency Modulation

Peak deviation (rates >25 Hz ac FM)

HP 8647A

<249 MHz: 0 to 100 kHz.
<501 MHz: 0 to 50 kHz.
≤1000 MHz: 0 to 100 kHz.

HP 8648A/B/C/D

<249 MHz: 0 to 200 kHz.
<501 MHz: 0 to 100 kHz.
<1001 MHz: 0 to 200 kHz.
<2001 MHz: 0 to 400 kHz.
≤4000 MHz: 0 to 800 kHz.

Resolution

For ≤10% peak deviation

<2001 MHz: 10 Hz.
≥2001 MHz: 20 Hz.

For >10% to maximum peak deviation

<2001 MHz: 100 Hz.
≥2001 MHz: 200 Hz.

Deviation accuracy (internal 1 kHz rate)

HP 8647A

±7.5% of FM deviation ±30 Hz.

HP 8648A/B/C/D

<1001 MHz: ±3% of FM deviation ±30 Hz.
<2001 MHz: ±3% of FM deviation ±60 Hz.
≤4000 MHz: ±3% of FM deviation ±120 Hz.

Rates

HP 8647A

Internal: 400 Hz or 1 kHz.
External: DC: dc to 75 kHz (typical, 3 dB BW).

AC: 20 Hz to 75 kHz (typical, 3 dB BW).

HP 8648A/B/C/D

Internal: 400 Hz or 1 kHz or 10 Hz to 20 kHz with Opt 1E2.
External: DC: dc to 150 kHz (typical, 3 dB BW).

AC: 1 Hz to 150 kHz (typical, 3 dB BW).

2

After one hour warm-up and within one year of calibration.

3

After four days warm-up and within one year of calibration.

4

Applies over the 25 ±5˚ C range.

5

Applies for line voltage change of ±5%.

6

Non-harmonic spurious are –55 dBc from 220 to 250 MHz.

7

Combining option 1E6 with 1EA reduces maximum output power by 2 dB
above 100 MHz. Below 100 MHz, maximum output is +13 dBm (typi­cally +16 dBm for carrier frequencies between 100 kHz and 100 MHz).

8

Accuracy is valid from maximum specified output power to –127 dBm.
Below –127 dBm, accuracy is typically ±3 dB in the range 100 kHz to
2500 MHz, and is not specified outside this frequency range.

9

Accuracy applies at 25 ±5˚C; and typically degrades up to ±0.5 dB
over 0 to 50˚C or at output power levels >13 dBm.

10

Accuracy is ±3 dB for power levels between –100 dBm and –127 dBm

for frequencies below 100 kHz or above 2500 MHz.

11

AM is typical above 1001 MHz.

12

AM accuracy applies at 25 ±5˚C and at <70% depth: it is typically

±7% of setting ±1.5% over 0 to 50˚C.

4

Distortion (1 kHz rate, THD + N, 0.3 to 3 kHz BW)
<1001 MHz: <1% at deviations >4 kHz.
<2001 MHz: <1% at deviations >8 kHz.
≤4000 MHz: <1% at deviations >16 kHz.
(88 to 108 MHz: <0.5% at deviations ≥75 kHz

Carrier frequency accuracy (relative to CW in dcFM)

HP 8647A

±500 (typical 200) Hz, deviations <10 kHz.

HP 8648 A/B/C/D

<1001 MHz: ±100 (typical 40) Hz, deviations <10 kHz.
<2001 MHz: ±200 (typical 80) Hz, deviations <20 kHz.
≤4000 MHz: ±400 (typical 160) Hz, deviations <40 kHz.

FM + FM

Internal 1 kHz or 400 Hz source plus external. In internal
plus external FM mode, the internal source produces the
set level of deviation. The external input should be set
to ≤±0.5V peak or 0.5 Vdc (one-half the set deviation).

13

).

Phase Modulation

Peak deviation

<249 MHz: 0 to 10 radians.
<501 MHz: 0 to 5 radians.
<1001 MHz: 0 to 10 radians.
<2001 MHz: 0 to 20 radians.
≤4000 MHz: 0 to 40 radians.

Resolution

<2001 MHz: 0.01 radians.
≥2001 MHz: 0.02 radians.

Deviation accuracy (internal 1 kHz rate, typical)

HP 8647A

±7.5% of deviation ±0.05 radians.

HP 8648A/B/C/D

<1001 MHz: ±3% of deviation ±0.05 radians.
<2001 MHz: ±3% of deviation ±0.1 radians.
≤4000 MHz: ±3% of deviation ±0.2 radians.

Rates:

Internal

400 Hz or 1 kHz or 10 Hz to 20 kHz with Opt 1E2

External

20 Hz to 10 kHz (typical, 3 dB BW).
Distortion (1 kHz rate)

HP 8647A

<2% at deviations ≥3 radians.

HP 8648 A/B/C/D

<1001 MHz: <1% at deviations ≥3 radians.
<2001 MHz: <1% at deviations ≥6 radians.
≤4000 MHz: <1% at deviations ≥12 radians.

15

.

Modulation Source

Internal

400 Hz or 1 kHz, front panel BNC connector provided
at nominally 1 Vpk into 600Ω.

14

External

1 Vpk into 600Ω (nominal) required for full scale
modulation. (High/Low indicator provided for external
signals ≤10 kHz.)

Modulation Generator (Option 1E2)

Adds variable frequency modulation source. Functions also
included in Option 1EP Pager encoder/signalling option.

Waveforms

Sine, Square, Triangle, Sawtooth (Ramp).

Frequency range

Sine: 10 Hz to 20 kHz.
Square, Triangle, Sawtooth: 100 Hz to 2 kHz.

Frequency accuracy

±0.01% typical.

Frequency resolution:

1 Hz (3 digits or 10 Hz displayed).
Depth & Deviation Accuracy (1 kHz sine)

Refer to AM, FM, and Phase Modulation Accuracy specs.

Output

Front panel BNC. Nominally 1 Vpk

Pulse Modulation (Option 1E6)

(HP 8648B/C/D only)

Adds high performance pulse modulation capability.

On/off ratio

<2000 MHz: >80 dB.
≤4000 MHz: >70 dB.

Rise/fall times

<10 ns.

Maximum repetition rate

10 MHz.

Video feedthrough

<30 mV (typical).

Delay

<60 ns (typical).

Pulse input

TTL level (±15V max).

15

16

5

PagerEncoder/Signaling (Option 1EP)

(HP 8648A only)

17

Adds functionality for testing POCSAG, FLEX™
FLEX-TD. Also includes Modulation Generator func­tions of Option 1E2. Instrument characteristics are the
same as the HP 8648A except as noted below.

Frequency

Accuracy with Option 1E5
carrier frequency in Hz or 0.092x10

18

: Typically ±0.15x10–6x

–6

x carrier fre-

quency in Hz within 90 days of calibration.

Frequency Modulation

FSK Deviation Accuracy with Option 1EP: ±60 Hz.

10

5

Drift (Hz)

0

0 0.5 1 1.5 2 2.5 3

Tlime (Hours)

and

Pager Signaling

Supported Pager Protocols: POCSAG, FLEX™, and
FLEX-TD.

POCSAG

Speed: 512, 1200, and 2400 bps.
Message Format: Tone only, Numeric, Alphanumeric.

FLEX/FLEX-TD

Speed

2 Level FSK: 1600 and 3200 bps.

4 Level FSK: 3200 and 6400 bps.
Message Format: Tone only, Numeric (standard and
special), Alphanumeric, HEX/Binary.

19

Address Type: Short, Long.

Messaging Accessible from Front Panel or HP-IB

Message Types: Five fixed (built-in), one user-defined.
Message Length: 40 characters maximum.
Repetition Modes: Single, Burst, Continuous.

Messaging Accessible only Over HP-IB

Message Type: Arbitrary (user-defined).
Batch Length

FLEX/FLEX-TD: 128 Frames.

POCSAG: 128 Batches.
Repetition Mode: Single only.
Data Rate Accuracy: ±5 ppm.

20

Modulation Source

Internal: 400 Hz or 1 kHz, or audio generator (see
Option 1E2 for characteristics), front panel BNC con­nector provided at nominally 1 Vp into 600 ohms.

General

Storage Registers: 70 storage registers with sequence
and register number displayed. Up to 10 sequences are
available with 30 registers each.

13

Only on HP 8648 series.

14

Specifications apply over the 25 ±5˚C range within one hour of

dc FM calibration.

15

Only on HP 8648 series.

16

Useable from 10 Hz to 20 kHz; however, bandwidth limitations may

result in waveform degradation. Refer to AM, FM, and Phase Modulation

Rate specs (External AC mode).

17

FLEX is a Motorola trademark.

18

After one hour warm-up and within one year of calibration.

19

Specifications apply over the 25 ±5˚C range, 4.8 kHz deviation.

Meets FLEX requirements at 274 to 288, 322 to 329, 929 to 932 MHz.

20

Specifications apply over the 25 ±5˚C range.

6

ISO 9002 Compliant

The HP 8647A and HP 8648A/B/C/D signal generators
are manufactured in an ISO 9002 registered facility
in concurrence with Hewlett-Packard’s commitment
to quality.

Environmental

Operating temperature range

0˚ to 50˚C.

Shock and vibration

Meets MIL STD 28800E Type III, Class 5.

Leakage

Conducted and radiated interference meets MIL STD
461B RE02 Part 2 and CISPR 11. Leakage is typically
<1 µV (nominally 0.1 µV with a two-turn loop) at
≤1001 MHz, when measured with a resonant dipole
antenna one inch from any surface (except the rear panel)
with output level <0 dBm (all inputs/outputs properly
terminated).

Remote Programming

Interface

HP-IB (IEEE-488.2-1987) with Listen and Talk.

Control languages

SCPI version 1992.0. HP 8656B and 8657 code
compatibility on HP 8648A/B/C/D.

Functions controlled

All functions are programmable except the front-panel
power key, the knobs, the increment set key, the arrow
keys, the reference keys and the rear-panel display
contrast control.

IEEE-488 functions

SH1, AH1, T6, TE0, L4, LE0, SR1, RL1, PP0, DC1,
DT0, C0, E2.

General

Power requirements

90 to 264 V; 48 to 440 Hz; 170 VA maximum.

Internal diagnostics

Automatically executes on instrument power-up.
Assists user in locating instrument errors and locating
faulty module.

Storage registers

300 storage registers with sequence and register num­ber displayed. Up to 10 sequences are available with 30
registers each.

Weight

HP 8647A and HP 8648A

7 kg (15 lb.) net, 9 kg (20 lb.) shipping.

HP 8648B/C/D

8.5 kg (19 lb.) net, 11 kg (24 lb.) shipping.

Dimensions

HP 8647A

165H x 330W x 333D mm (6.5H x 13W x 13.2D inches).

HP 8648A/B/C/D

165H x 330W x 368D mm (6.5H x 13W x 14.6D inches).

Options

1EA: High power (HP 8648B/C/D).
1E2: Modulation generator (HP 8648A/B/C/D).
1E5: High stability timebase.
1E6: Pulse modulation (HP 8648B/C/D).
1EP: Pager encoder/signalling (HP 8648A).

1CM Rack kits

HP 8647A: P/N 08647-61020.
HP 8648A/B/C/D: P/N 08648-60001.
0B0: Delete manual.
0B1: Extra manual (includes service information).
W30: Three year warranty.

Accessories

Transit case

HP 8647A: P/N 5960-2229.
HP 8648A/B/C/D: P/N 5961-4720.

HP 83300A Remote Interface.
HP 83301A Memory Interface.

Translated Operating Manuals

Options Language Part Number
HP 8647A

AB0 Chinese for Taiwan 08647-90010
AB1 Korean 08647-90011
AB2 Chinese for PRC 08647-90012
ABE Spanish 08647-90013
ABJ Japanese 08647-90016

HP 8648A/B/C/D

AB0 Chinese for Taiwan 08648-90002
AB1 Korean 08648-90006
AB2 Chinese for PRC 08648-90004
ABD German 08648-90019
ABE Spanish 08648-90003
ABF French 08648-90020
ABJ Japanese 08648-90005

7

INPUT OUTPUT

HP 8647/8648 rear panel

DISPLAY

CONTRAST

REMOTE

FRONT PANEL

FUSE 3A

HP-IB

®

For more information on
Hewlett-Packard T est & Measurement
products, applications or services
please call your local Hewlett-Packard
sales office. A current listing is
available via Web through AccessHP
at http://www.hp.com. If you do not
have access to the Internet, please
contact one of the HP centers listed
below and they will direct you to
your nearest HP representative.

United States:

Hewlett-Packard Company
Test and Measurement Organization
5301 Stevens Creek Blvd.
Bldg. 51L-SC
Santa Clara, CA 95052-8059
1 800 452 4844

Canada:

Hewlett-Packard Canada Ltd.
5150 Spectrum Way
Mississauga, Ontario L4W 5G1
[phone]

Europe:

Hewlett-Packard
European Marketing Centre
P.O. Box 999
1180 AZ Amstelveen
The Netherlands

Japan:

Hewlett-Packard Japan Ltd.
Measurement Assistance Center
9-1, Takakura-Cho, Hachioji-Shi,
Tokyo 192, Japan
(81) 426 48 3860

Latin America:

Hewlett-Packard
Latin American Region Headquarters
5200 Blue Lagoon Drive, 9th Floor
Miami, Florida 33126, U.S.A.
[phone]/4220

Australia/New Zealand:

Hewlett-Packard Australia Ltd.
31-41 Joseph Street
Blackburn, Victoria 3130, Australia
131 347 Ext. 2902

Asia Pacific:

Hewlett-Packard Asia Pacific Ltd.
17-21/F Shell Tower, Time Square,
1 Matheson Street, Causeway Bay,
Hong Kong
(852) 2599 7070

Data Subject to Change
Copyright © 1996
Hewlett-Packard Company
Printed in U.S.A. 7/96
5965-3432E