N2735A OPTION 004 AGILENT TECHNOLOGIES, N2735A OPTION 004 Datasheet - Page 7

• Manufacturer Part Number: N2735A OPTION 004
• Description: Oscilloscope Software
• Manufacturer: AGILENT TECHNOLOGIES
• Series: DSO7000r

Specifications of N2735A OPTION 004

• No. Of Channels: 4
• Scope Bandwidth: 350 MHz
• Scope Type: Hand Held
• Lead Free Status / RoHS Status: na

How update rate affects signal visibility
Capturing random and infrequent events on an oscilloscope is all about statistical probabilities. The key to improving the probability of
capturing a signal anomaly is to minimize dead-time and take more pictures of the signal in a given timeframe. Here is an example with Tek
and Agilent scopes both connected to a target with a glitch that occurs 25 times per second.
Tek MSO4104
• Product data sheet: 50,000 waveforms per second,
• Update rate = 18 waveforms per second with 10 Mpts and
• Probability of capturing the infrequent glitch = 0.09% after
• Average time to capture just one glitch = 128 minutes.
* Agilent and LeCroy memory depth selection was automatically selected. Memory depth = display window times sample rate with up to 8 Mpts for Agilent.
** Tek measurements taken with version 2.13 fi rmware.
Seeing subtle signal detail and infrequent events requires a scope with fast waveform update rates. Don’t take a scope vendor’s banner waveform
update rate specifi cation at face value. Test it yourself. It’s actually pretty easy to characterize a scope’s update rate. Run a moderately fast signal (e.g.
50 Mhz) into a scope channel. Measure the scope’s average trigger output signal frequency. This is your scope’s update rate for the specifi ed time-
base setting. Test the update rate of the scope under various setup conditions. Setup conditions that Agilent suggests varying include timebase range,
memory depth, and number of channels, including analog, digital, as well as channels assigned for serial decoding.
Increase memory setting
digital channels turned on. Resulting measurement shown.
running for 10 seconds.
Turn on serial decode
Add digital channels
Change timebase
Initial setup
?
?
Tek
10 Kpts
10 Kpts
10 Kpts
10 Mpts
10 Mpts
Memory*
?
Timebase setting
20 ns/div
10 ns/div
20 ns/div
20 ns/div
20 ns/div
Scope settings
Digital Channels
On
On
On
-
-
signal activity
signal jitter
Infrequent
Critical
Serial Decode
On
-
-
-
-
Agilent MSO7104B
• Product data sheet: 100,000 waveforms per second.
• Update rate = 95,000 waveforms per second with auto
• Probability of capturing the infrequent glitch = 99% after
• Average time to capture just one glitch = 1.5 seconds.
memory and digital channels turned on. Resulting
measurement shown.
running for 10 seconds.
TEK MSO4104A**
55,000
2,700
125
35
0.2
Measured update rates
LeCroy WR 104Xi
27
27
27
27
25
Agilent MSO7104B
95,000
60,000
95,000
95,000
95,000
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