Model 8640B TM 9-4935-601-14-7&P
Table 1-1. Specifications (1 of 5)
(All specifications apply over the nominal Frequency Bands and over the top 10 dB of the output level vernier range
unless otherwise specified.)
FREQUENCY CHARACTERISTICS
Range: 500 kHz to 512 MHz in 10 Octave Bands (to
1024 MHz with External Frequency Doubler).
Bands and Band Overlap: Bands extend 10% below
and 7% above the nominal Frequency Bands shown
below.
Frequency Range (MHz)
Frequency Bands (MHz) (with overlap)
0.5 - 1 0.45 - 1.07
1 - 2 0.9 - 2.1
2 - 4 1.8 - 4.2
4- 8 3.6 - 8.5
8- 16 7.2 - 17.1
16- 32 14.4 -34.3
32 - 64 28.8 - 68.7
64 - 128 57.5 - 137.5
128 - 256 115 - 275
256 - 512 230 - 550
External Doubler Band
1
460 - 1100
512 - 1024
Internal Counter Resolution:
Frequency Bands Normal Expand Expand
(MHz) Mode X10 X100
0.5-1
10 Hz 1 Hz 0.1 Hz
1 -16
100 Hz 10 Hz 1 Hz
16 - 128
1 kHz 100 Hz 10 Hz
128 -1024
10 kHz 1 kHz 100 Hz
Accuracy: 6-digit LED display with X10 and X100
expand; accuracy depends on internal or external
reference used.
2
Total Counter Reference
Count = Resolution + Error
Accuracy (±1 count) (INT or EXT)
Internal Reference Error <±2 ppm
(when calibrated at 25°C every 3 months and oper-
ated between 15°C and 35°C)
Fine Tuning:
Unlocked: >200 ppm total range.
Locked mode: >±20 ppm by varying internal time
base vernier.
Stability:
Normal Locked
3
Time
(after 2-hour <10 ppm/10min <0.05 ppm/hr
warm-up)
<2 ppm total
4
Temperature
<50 ppm/°C (room ambient
15 to 350C)
Line Voltage
5
(+5% to -10% line <1 ppm <0.1 ppm
voltage change)
Load
(with any passive <1 ppm
load change)
Level Change
(10 dB on output <1 ppm None
level vernier) measurable
<1% of selected
Mode Change
peak deviation or
(CW to FM) <200 Hz which-
ever is greater
1
In the External Doubler Band. the 8640B counter displays the actual doubled output frequency. and the FM meter
indicates the proper peak deviation.
2
When phase locked, Counter Resolution error is eliminated.
3
These specifications are given for the 8640B internal reference. When using an external reference, drift in the
locked mode will depend on the external reference characteristics.
4
Phase lock may break due to temperature change (i.e., during warm-up). Simply relock at desired frequency.
5
This specification is for short term, transient line changes.
1-8
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