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The attenuators used are based on the expected value or range specified.
Table 3-1 shows the attenuators used as a function of the expected value and
range.
Using the Single-Ended Input 1V Range
When taking readings of low-level signals on the single-ended input,
selecting the 1V range ensures the most accurate readings. This is achieved
through a path directly to the A/D, which bypasses the attenuators and
amplifier which can add noise and distortion to the signal (Figure 3-3).
The single-ended input 1V range can be set by specifying an
<expected value > of 1V in the MEASure or CONFigure command, or by
specifying a range of 1V in the SENSe:VOLTage command:
SENS:VOLT:RANG 1
Input Port <
expected
value
>
(MEAS/CONF)
Range
setting
<
range
>
Measurement
Range
20 dB
Input
Attenuator
20 dB
Post
Attenuator
Internal Attenuators
6 dB 14 dB
1,2,3,4
±0.1
0.10235 -0.10230 to 0.10235 off off off off
1,2,3,4
±0.2
0.2047 -0.2046 to 0.2047 off off on off
1,2,3,4
±0.5
0.51175 -0.5115 to 0.51175 off off off on
1,2,3,4
±1.0
1.0235 -1.0230 to 1.0235 off on off off
3,4
±2.0
2.047 -2.0460 to 2.0470 off on on off
3,4
±5.0
5.1175 -5.115 to 5.1175 off on off on
3,4
±10.0
10.235 -10.230 to 10.235 on on off off
3,4
±20.0
20.470 -20.460 to 20.470 on on on off
3,4
±50.0
51.175 -51.150 to 51.175 on on off on
3,4
±100.0
102.35 -102.30 to 102.35 on on on on
Table 3-1. HP E1429 Digitizer Measurement Ranges
110 Understandin
g
the HP E1429 Di
g
itizer Chapter 3