Keithley 3400 Series Quick Start Manual

Quick Start Guide

Understanding Basic Pulse Parameters
Step 3
Freq 165.0 MHz Per 6.06 ns Pulse Mode
CH 1 Ampl
1 Width 3.04 ns 2 Width 3.00 ns
Delay 0 ps Delay 0 ps 1.00 Vpp
LeadE 2.5 ns LeadE 2.5 ns
Trigger = ExtIn
TrailE 2.5 ns TrailE 2.5 ns
Channel Freq Per Width Delay More
Step 2
Setting your pulse parameters is a simple three step
process:
1. Choose your high level configuration with the menu keys.
2. Select the desired parameter with the Soft Keys.
3. Enter the desired value with the control knob or numerical
keypad.
Front Panel Setup Example
The following information demonstrates how to properly connect a
Keithley Instruments Model 340x Pulse Pattern Generator to an
1
oscilloscope and how to navigate the front panel menu. The
information depicts how to adjust the most common pulse
parameters, including pulse amplitude, offset, width, period, and
leading and trailing edges.
Power On the Model 340x Pulse Pattern Generator:
1. Enable rear panel power switch ("ON" position).
2. Press front panel on/off switch.
Make Connections Between Pulse Generator &
Oscilloscope:
Connect a BNC-BNC cable between CH 1 output and CH 1 input of
the oscilloscope.
Configure Oscilloscope:
1. In trigger menu of scope:
a. Configure scope to trigger on rising edge of CH 1.
b. Set trigger level to +0.25V.
2. In vertical menu of scope:
a. Set input impedance to 50 or use a 50 feed through, such
as the Keithley Instruments Model 7755.
b. Set voltage scale to 500mV/division.
3. In Horizontal menu of scope, adjust the time scale to 400ns.
Turn on output Channel 1 of the pulse generator by pressing the CH
1 Enable button and verify that you have the following signal:
Adjust Output Pulse:
Unit should power up in "Mode" display window.
1. Press "Pulse" soft key.
2. Press VOLTS menu key.
3. Verify Channel 1 is selected. (NOTE: The dark gray area
should appear on left side of display and a "1" should appear in
the top left corner of display.)
1 Ampl 1.00 Vpp 2 Ampl
Step 1
Offset 0m V
HiLvl 500 mV
LoLvl -500 mV
Pol Norm
Channel Ampl
4. Set amplitude to 1.50Vpp:
a. Press "Ampl" soft key. If "Ampl" soft key is not visible, first
press the "More" soft key.
b. Use knob to adjust amplitude value to "1.50 Vpp."
NOTE: Field "HiLvl" should read "750mV" and "LoLvl" should read
"-750mV."
5. Set offset to 750mV:
a. Press "Offset" soft key.
b. Use numeric keys to enter "0.75." NOTE: Units appear
above the soft keys.
c. Press soft key that corresponds to "V."
NOTE: Field "HiLvl" should read "1.5V" and "LoLvl" should read
"0mV."
6. Press TIME menu key.
7. Change pulse width to 500ns:
a. Press "Width" soft key.
b. Use knob to scroll to 500ns.
Freq 1.000 MHz
1 Width 500.0 ns 2 Width
Delay 250.0 ns
2.5 ns
LeadE
TrailE 2.5 ns
Channel Freq
8. Adjust leading and trailing edges:
a. Press "More" soft key.
b. Press "LeadE" soft key.
c. Use numeric keys to enter "100."
d. Press "ns" soft key.
e. Press "TrailE" soft key.
f. Use numeric keys to enter "250" then press the "ns" soft
key.
1.00 Vpp
Pulse Mode
Offset 0m V
Ch 1 Ampl
HiLvl 500 mV
1.00 Vpp
LoLvl -500 mV
Trigger = ExtIn
Norm
Pol
Offset HiLvl LoLvl More
Per 1.000 µs
Pulse Mode
100.0 ns
Ch 1 Width
Delay 250.0 ns
500.0ns
2.5 ns
LeadE
Trigger = ExtIn
TrailE 2.5 ns
Per Width Delay More
9. Change period to 2µs:
a. Press "More" soft key.
b. Press "Per" soft key.
c. Use knob to change the period to 2µs.
Oscilloscope should now display the following waveform:
Other Notes:
- These steps can be repeated using CH 2. Use the "Channel"
soft key in TIME and VOLTS menus to select CH 2 and adjust
its parameters. To enable CH 2 output, press the CH 2 Enable
key.
- The TRIG OUT terminal of the Model 340x may be used to
trigger the scope. The Trig Out signal is a TTL signal at 50%
duty cycle this has the same pulse repetition frequency as the
output channel(s). Please refer to section 5 of the User's
manual for details on triggering.
Reset Model 340x to Factory Defaults:
1. Press UTILITY menu key.
2. Press "Recall" soft key
3. Press "Default" soft key. (Instrument will now reset to factory
defaults.)
For additional help, please review the Model 340x User's Manual.
You may also view FAQs or submit a request for a consult with an
Applications Engineer on the Keithley Instruments website at
www.keithley.com.
1. In order to observe the fastest rise times of the Model 340x Pulse Pattern
Generator, an oscilloscope with 500MHz bandwidth is recommended.