VOYAGER
Voyager LECP Data Analysis Handbook
Calibrations and Channel Definitions
The Voyager (MJS) LECP Pulse Height Analyzer (PHA)
Specifications for LECP Pulse Height Analyzer
| Power | A/D Circuit Standby |
A/D Circuit During Conversion |
Peak Detector Circuit |
| +12.0 V | 1 mA | 17 mA | 4 mA |
| 8.0 | 1 | 4 | 7 |
| 6.0 | 1 | 1 | 13 |
| -6.0 | nil | 8 | 23 |
| -12.0 | 2 | 4 | not reqd. |
| Resolution: | 10 bits - 1023 counts full scale |
| Accuracy: | Digital voltmeter section with
multiplexer (both LEPT and LEMPA models): 0.1% or 1 bit from calibration @ 25ºC against channel calibration 0.3% max observed absolute deviation between channels at 25ºC 0.6% max observed absolute deviation from 25 to -50ºC 0.5% max observed deviation for power supply variation of 10% See Calibration Table and Test Records for additional data. |
| Range: | LEPT Mode - 0 to 2.00 volts LEMPA Mode - 0 to 8.00 volts |
| Peak Detector Characteristics: | Offset error less than 20 mV (1%)
over the environment. Transmitted resolution - 8 bits - 0.5% - 8 mV Maximum droop error for last channel converted (@60ºC) - 2% - 30 mV (@25ºC) < .6% - 12 mV Error from 10% power supply variation - less than 0.5% - 8 mV max @ 25ºC |
| Clock Frequency (external) |
50 kHz (range of about 45 to 80 kHz acceptable). |
| Calibration | LEPT: 3 point calibration @ 0.2%,
6%, and 45%. Counts 0002, 0060, 0457 (1023 FS). LEMPA: 2 point calibration @ 0.2% and 98.3%. Counts 0002, 1005 (1023 FS). Note the last two bits are not transmitted in LEPT mode and the telemetered values read 000, 060, 456 for Full Scale of 255 counts. |
| Multiplexer protection: | 10 kohm input resistor all channels |
| Interface protection: | Series resistors all input and
output lines. Output levels have 100 nSec risetimes. Output levels are 15 KW to ground when power is OFF. |
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LECP Data Analysis Handbook Table of Contents.
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Updated 8/9/19, Cameron Crane
VOYAGER 1 ELAPSED TIME
--:--:--:--
Days: Hours:
Minutes: Seconds
*Since official launch
September 5, 1977, 12:56:00:00 UTC
*Since official launch
September 5, 1977, 12:56:00:00 UTC
VOYAGER 2 ELAPSED TIME
--:--:--:--
Days: Hours:
Minutes: Seconds
*Since official launch
August 20, 1977, 14:29:00:00 UTC
*Since official launch
August 20, 1977, 14:29:00:00 UTC
QUICK FACTS
Manufacturer:
Voyagers 1 and 2 were built in the Jet Propulsion
Laboratory in Southern California.
Mission Duration: 40+ years have elapsed for both Voyager 1 and Voyager 2 (both are ongoing).
Destination: Their original destinations were Saturn and Jupiter. Their current destination is interstellar space.
Mission Duration: 40+ years have elapsed for both Voyager 1 and Voyager 2 (both are ongoing).
Destination: Their original destinations were Saturn and Jupiter. Their current destination is interstellar space.