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TDR100

2. System Specifications

2.1 General

See the CR10X, CR23X, CR800/CR850, CR1000, or CR3000 datalogger

manuals for datalogger specifications.

2.2 Power Consumption

2.2.1 TDR100

• The current demand for the TDR100 during measurement is 270

milliamps.

• When the TDR100 is controlled by a datalogger, a 35 second timer puts

the device in sleep mode requiring about 20 milliamps. After 35 seconds

in sleep mode, a timer puts the TDR100 in standby mode requiring about

2 milliamps.

• When the TDR100 is controlled by PCTDR, a 60 second time-out puts

the device in low power mode requiring about 60 milliamps.

2.2.2 SDMX50

• The quiescent current demand for the SDMX50 multiplexer is less than 1

milliamp.

• Current demand during switching is approximately 90 milliamps.

• All multiplexers of the same level switch simultaneously (see Figure 5-1).

Switching takes less than 1 second.

2.3 TDR100 Performance Specifications

pulse generator output 250 mV into 50 ohms

output impedance

50 ohms ± 1%

time response of combined pulse

generator and sampling circuit

≤ 300 picoseconds

pulse generator aberrations

±5% within first 10 nanoseconds

±0.5% after 10 nanoseconds

pulse length 14 microseconds

timing resolution 12.2 picoseconds

waveform sampling

range

resolution

20 to 2048 waveform values over

chosen length

distance

= 1) time (1 way travel)

-2 to 2100 meters 0 to 7 microseconds

1.8 millimeter 6.1 picoseconds

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 59 60

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Campbell TDR Spezifikationen Seite 8