User manual

Logic Analyzer (R&S RTH-B1 MSO)
R&S
®
Scope Rider RTH
136User Manual 1326.1578.02 ─ 04
Logic Channels
Enables or disables the logic channels.
Visible
By default, all 8 logic channels are displayed. Disable the logic channels that you do
not need for analysis.
Couple Thresh.
Couples the threshold and hysteresis settings for the logic channels.
If enabled, all logic channels use the same threshold and hysteresis settings.
If disabled, 2 channel groups are available, which can use different threshold and hys-
teresis settings: D0 - D3, and D4 - D7.
Remote command:
LOGic:THCoupling on page 226
Threshold
Sets the threshold value for the selected channel group, or for all logic channels. For
each acquired sample, the instrument compares the input voltage with the threshold
value. If the input voltage is above the threshold, the signal state "1" is stored. Other-
wise, the signal state "0" is stored if the input voltage is below the threshold.
You can set the digital threshold in several ways:
●
The same threshold and hysteresis are used for all logic channels: Enable "Thresh-
old" and set the values for channels D0 - D3, and D4 - D7.
●
Different thresholds and hysteresis are used for individual channel groups: Disable
"Threshold" and set the threshold and hysteresis for each group.
You can select the threshold voltages for various types of integrated circuits in the list,
or set a user-defined value.
"TTL"
1.4 V
"ECL"
-1.3 V
"CMOS"
2.5 V
"User"
Set the threshold value in "User Threshold Value".
Remote command:
LOGic:GROup<m>:TECHnology on page 227
LOGic:GROup<m>:USER on page 227
Hysteresis
Hysteresis avoids the change of signal states due to noise oscillation around the
threshold level. Set a small hysteresis for clean signals, and large hysteresis for noisy
signals.
Logic Analyzer Settings