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.
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