Specification—485/R485 Service
CALIBRATOR
Two-Frequency Fast-Rise Calibrator
Accuracies +15°C to +35°C —15°C to +55°C
5 V amplitude to
1 Mft load
0.5%
1%
0.5 V amplitude to
50 ft ±0.5% load
1%
1.5%
50 mA amplitude to
optional BNC acces
sory current loop
1% 1.5%
Selectable Frequency
of 1 MHz and 1 kHz
0.25% 0.5%
Output Resistance
450 S2
Risetime
Positive edge into 50 £1, less than 1 ns. Overshoot and
ringing less than 2% into 50 at 1 GHz bandwidth.
1 kHz Duty Cycle
49.8% to 50.2%
OTHER CHARACTERISTICS
Signal Outputs
Positive gates from both time bases (approximately 4 V),
and a positive-going Sawtooth from Time Base A
(approximately 10 V). Gates and Sawtooth are approxi
mately 0.5 V amplitude into 50 S2.
Power Requirement
Two-position line voltage selector 115 V (90 V to
136 V) and 230 V (180 V to 272 V) 48 to 440 Hz. 60
watts maximum at 115 V and 60 Hz. 0.9 A maximum at
115 V and 60 Hz. Line fuse: 3 A fast.
Cooling
Quiet, filtered, forced-air ventilation. Fan speed
increases smoothly with increasing ambient temperature.
ENVIRONMENTAL CHARACTERISTICS
Ambient Temperature
Operating: —15°Cto+55°C
Storage: — 35°C to +75°C
Altitude
Operating: to 15,000 feet. Maximum allowable ambient
temperature decreased by 1°C per 1000 feet from 5,000
to 15,000 feet.
Nonoperating: to 50,000 feet.
Vibration5
Operating: 15 minutes along each of the three axis,
0.025 inch peak-to-peak displacement (4 g’s at 55 Hz)
10 to 55 to 10 Hz in 1-minute cycles.
Shock5
Operating and Nonoperating: 30 g's, one half sine,
11-ms duration, 2 shocks per axis in each direction for a
total of 12 shocks.
Electromagnetic Interference
(With 485 EMI modification option 4). Meets inter
ference requirements of MIL-1-618D: power line
conducted, 150 kHz to 25 MHz; radiated, 150 kHz to
GHz.
Humidity
Operating and Storage: 5 cycles (120 hours) to 95%
relative humidity referenced to MIL-E-16400F (par.
4.5.9 through 4.5.9.5.1, class 4).
Dimensions and Weight
Height: 6 and 9/16 inches.
Width: (with handle) 12 inches.
Depth (including panel cover): 18 and 1/2 inches.
Depth (handle extended): 20 and 5/8 inches.
Net weight (without accessory case and panel cover): 21
pounds.
Net weight (with panel cover, accessory case and
accessories): 24 pounds.
Domestic shipping weight: 31 pounds.
Export-packed weight: 42 pounds.
SR485 strapped to table, not mounted in rack.
1-6
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