HP 608E Operating And Service Manual page 8

Section I
Model 608E/F
Table 1-1. Specifications
FREQUENCY CHARACTERISTICS
608E
Accuracy: Within ±1 dB of attenuator dial reading
at
any frequency when RF output meter indicates
"ATTENUATOR CALIBRATED."
input. A voltage change from -2 volts to -32 volts
will change the output frequency more than 0.2%
at the low end of each band and more than 1% at
the high end of each band. Nominal 4 Kn input
impedance, direct coupled. Voltage limits:
OV .::: applied voltage .::: -50V.
OUTPUT CHARACTERISTICS
608E 608F
Output Level: Continu-
ously adjustable from
0.1 trV to O. 5V into a
50n load. Output at-
tenuator calibrated in
V and dBm (0 dBm
=
1 mW
in
50n).
Output Level; Continu-
ously adjustable from
0.1 /lV to IV into a
50n load. Output at-
tenuator calibrated in
V and dBm (0 dBm
=
1
mW in SOn).
608F
Range: 10 to 455 MHz in
five bands (10-21, 21-
44,44-95,95-210, and
210-455 MHz). 10-
430 MHz when used
with 8708A Synchro-
nizer.
Accuracy: ±1 % with cur-
sor adjustment.
Drift: Less than 50 parts
in 10 6 per 10 min. pe-
riodafter Ihr. warm-
up. Stability used with
8708A Synchronizer.
5
x
10-
a
/min.
2
x
10- 7 /min.
Range: 10to 480 MHz in
five bands (10-21, 21-
43,43-95, 95-215, and
215-480 MHz).
Accuracy: ±O.5% with cur-
sor adjustment.
Drift: Less than 50 parts
in 10 6 per 10 min.
period after 1 hr.
warmup.
(0· -55 ·C)
-7
%
2 x 10 /10 line
voltage change.
Tuning Control: Frequency control mechanism
provides a
In
a i n dial calibrated in MHz and a
vernier dial for interpolation purposes. Total
scale length approximately 45 inches. Calibra-
tion: every othe r MHz from 13U to 27U MHz;
every 5 MHz above 270 MHz.
Leveling: Internal feedback circuit retains "AT-
TENUATOR CALIBRATED" reference on RF
output meter over wide frequency ranges (typi-
cally octave bands). Adjustment of front panel
AMP. TRIMMER control (only) for maximum
RF output indication automatically restores ini-
tial carr.ier level for greater frequency changes.
Impedance: 50n; reflection coefficient <0.091
(1. 2 SWR, 20.8 dB return loss) for attenuator
setting below -7 dBm.
)
Resettability: Main frequency control resettability
better than ±G. 1% after initial warmup. FINE
FREQUENCY ADJUST prOVides approximately
±25 kHz settabilityat 480 MHz (proportionately
finer adjustment at lower frequencies).
RFI: Meets all conditions specified
in
MlL-I-
618m; permIts receiver sensitiVity measure-
ments down to at least 0.1 /lV.
Auxiliary RF Output:
Crystal Calibrator: Provide s frequency check
points every 1 MHz up to 270 MHz or every
5 MHz over the range of the instrument. Head-
phone jack provided for audio frequency output
(headphones not incluC1ed). Crystal frequency
accuracy better than 0.01% at normal room
temperatures. Cursor on frequency
dial
adjust-
able over small range to aid in interpolation ad-
justment. -Calibrator maybe turned off when not
in use.
Residual FM: <±5 parts tn 10 7
in
a 10 kHz post-
detection bandwidth.
Harmonic Output: At least 35 dB below the carrier
for harmonic frequencies below 500 MHz.
Frequency Control Input: (608F only). The 608F
FREQ CONTROL INPUT normally used with the
8708A Synchronizer can also be use d for ex-
ternal frequency control by varying a dc voltage
608E
Fixed Ie ve I CW signal from RF oscillator
(minimum amplitude 180
In
V rms into 50n)
provided at front panel ENC female connector
for use with external equipment (e.g., fre-
quency counter).
608F
cw signal from RF Oscillator pro v i de d at
front panel ENC female connector. Powe r
levels into son are as follows:
10 to 215 MHz: -1. 8 to +7 dBm
215
to
400 MHz: +2. 0 to +6 dBm
400 to 430 MHz: +1. 0 to +5 dBm
Signal for use with HP 8708A Synchronizer or
othe r external equipment (e.g., frequency
counter).
)
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